Concrete Research Articles

Quantitative evaluation on the effects of the spatial variability in concrete materials on seismic damage of concrete gravity dams

The influencing mechanism of the spatial variability in concrete materials on the seismic damage of concrete gravity dams is still unclear, and existing methods for evaluating the seismic damage are insufficient. In this work, the effects of concrete’s spatial variability on the seismic damage distribution, energy dissipation, and deformation in concrete gravity dams are performed based on the damaged plastic model of concrete. Prior to the seismic damage analysis, the method for seismic inputting and the correlation function for realizing random fields of concrete materials are carefully determined. Based on the seismic damage analysis of the Koyna gravity dam, the tensile strength has the greatest influence on the seismic damage, followed by the elastic modulus and fracture energy. Aiming at the parameter of tensile strength, the decrease of correlation distance and the increase of the coefficient of variation increase the damage degree and complicate the damage distribution. A convenient and comprehensive damage profiling indicator is proposed to avoid the one-sidedness and evaluation error caused by using a single scalar damage value. The triangular area enclosed by the three individual damage indexes represents the comprehensive damage degree, and the shape change of the damage triangle indicates the change in the damage pattern of the dam. This damage profiling indicator is specifically designed to quantitatively distinguish and evaluate the damage degrees between a series of damage cases.

Integrated approach to assess the environmental suitability of red ceramic waste as a supplementary cementitious material in structural concrete

Integrated approach to assess the environmental suitability of red ceramic waste as a supplementary cementitious material in structural concrete

Vacuum sintering of the self-developed Chang’E-5 lunar regolith simulant

The utilization of in-situ lunar resources through the additive manufacturing of lunar regolith (LR) has attracted considerable interest. Sintering of LR is considered a promising method for lunar construction due to its high utilization rate and excellent service stability. However, numerous studies have been carried out on Apollo series LRs with similar chemical compositions in air or inert gas atmospheres. The effects of the lunar ultra-high vacuum conditions and the complex chemical composition of LRs on the sintering process require extensive investigation. In this study, a self-developed Chang’E-5 lunar regolith simulant (LRS) with a high-Fe content was used as the only raw material to investigate its potential applicability for future lunar construction in vacuum environment. The effects of sintering temperature on the microstructure, linear shrinkage, bulk density, weight loss ratio, and mechanical and thermal expansion properties were investigated. The results show that the linear shrinkage and weight loss ratio increase with increasing sintering temperature. However, the bulk density and unconfined compressive strength (USC) initially increase and then decrease, with the sample sintered at 1075℃ giving the highest bulk density of 2.10 ± 0.03 g/cm3 and a USC of 31.19 ± 1.96 MPa. This is attributed to the transformation of the sample sintered at 1090℃ into a semi-porous material with many cracks. Furthermore, the mechanism of pore and crack formation was revealed. The coefficient of thermal expansion (CET) of the sintered samples is approximately 7×10–6°C−1, which maintains a good service stability after cyclic temperature stress from room temperature up to 200°C. Both the USC and CET of the sample sintered at 1075℃ are superior to those of common terrestrial concrete materials. This indicates that the vacuum sintering process appears feasible for the production of building materials with sufficient mechanical strength and thermal durability for lunar base construction.

Ultrasonic wave characteristics in multiscale cementitious materials at different stages of hydration

Monitoring the microstructural change in cementitious materials during hydration is an essential but challenging task. Therefore, a non-invasive and sophisticated technique is warranted to understand the microscopic behaviour of the multiphase cementitious materials (where the length scale of the constituents varies from centimeters to micrometers) in different stages of hydration. Due to exothermic hydration reactions, different hydration products start to evolve with individual mechanical properties. In concrete, an interface transition zone (ITZ) appears between the aggregate surface and paste matrix, which influences the overall properties of concrete material. In the present research, 1) several wave characteristics, such as wave velocity, energy distribution, and signal phase are found out using Ultrasonic Pulse Velocity (UPV), Wavelet Packet Energy (WPE) and Hilbert Transform (HT) methods, to monitor the hydration mechanism (1d-28d) in cement-based materials with two levels of heterogeneities (cement paste and concrete, representing microscale and mesoscale, respectively). Also, the unique nonlinear behaviour is studied in the frequency domain using the promising Sideband Energy Ratio (SER) and Sideband Peak Count Index (SPC-I) methods. 2) Numerical simulations are carried out to understand the wave interaction in the developing microstructure. A discretized microstructure of cement shows microscopic details of each phase at any instant of hydration (e.g., formation stage and after complete maturity level). The experimental and numerical investigations on the characteristics of the nonlinear ultrasonic wave propagation show the impact of microstructural development of multi-scale cementitious materials during hydration.

Mechanics and Durability of Polyurethane Cement Composite (PUC) Material

In order to investigate the mechanical properties of polyurethane cement (PUC) composite materials, axial tensile test, acid and alkali corrosion resistance test, bond test with concrete, and bond test with steel bars were conducted. The axial tensile results show that the tensile strength of PUC material is 31.11MPa, the stress-strain curve for axial tensile behavior of the material is obtained through fitting. To explore the durability of PUC materials, acid-alkali-salt corrosion resistance test is carried out, the results show that the PUC material has good resistance to acid and alkali corrosion. The failure mode of the bond test between PUC material and concrete is internal cohesion failure of concrete material, indicating good bond performance of PUC material. Axial tensile test of PUC material is carried out at different temperatures (-40℃~60℃). When subjected to temperatures between 40�C and 60�C, the strength of materials does not deteriorate. However, it is noteworthy that the material�s ability to withstand tensile strain significantly increases as temperatures rise to 60�C. The bonding strength between PUC material and steel bar increases with an increase in protective layer thickness, and at a thickness of 70 mm, the maximum bond stress is achieved at 16.38 MPa. On the other hand, the strength of the bond reduces as the anchorage length increases. Smooth round bars demonstrate a significantly lower bond strength compared to deformed bars, as their maximum bond strength is at approximately 47.4% of that of the deformed bars under the same conditions.

Research on the adhesion mechanism and compatibility of acrylate composite polyurethane binder − aggregate based on surface free energy theory

The raw materials selection and design of waterproof polymer concrete for steel bridge deck paving lack clarity regarding the adhesion mechanism and optimal compatibility between acrylate composite polyurethane binder (APUB) and various aggregates. This study systematically investigates these issues based on surface free energy (SFE) theory. Initially, Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) techniques are utilized to characterize chemical structure of APUB. Subsequently, obtaining the SFE parameters of APUB and aggregates through contact angle tests, and establishing the evaluation indices compatibility ratios ERs (ER1 and ER2) for the most compatible APUB-aggregate pairs. Finally, the correlation between ERs and the water stability of the APUB-aggregate pair is verified through shear tests conducted on sandwich specimens immersed in water. The findings reveal that APUB exhibits both acidic and non-polar surface properties. The SFE values of all aggregates surpasses that of APUB, indicating APUB's ability to wet the surfaces of all aggregates. Under dry conditions, non-polar basalt and limestone aggregates exhibit strong adhesion to APUB. This is primarily due to the combined effects of acid-base chemical reactions and the principle of compatibility, with the former predominating. Under wet conditions, APUB on non-polar basalt and limestone surfaces exhibits reduced susceptibility to displacement and detachment by water. The closer the polarity component of polar aggregates is to that of water, the easier water can displace APUB from the polar aggregate surfaces. Correlation analysis between the maximum shear force of the immersed specimens and the ER2 indicates that the APUB-basalt pair has the best compatibility. The cohesive work of APUB is crucial in establishing compatibility indicators for evaluating APUB-aggregate pairs. This study provides a theoretical basis for the raw material selection and design of polymer concrete for steel bridge deck paving.

PAINTING HISTORY: PICTURE, WITNESS, AND ANCIENT HISTORIOGRAPHY

ABSTRACTThis article treats an analogy that is used persistently in the history of historiography: the equation of historiography with painting and the identification of the historiographer with the painter. In examining the conceptual stakes of this (auto)identification, the article mobilizes the analogy in order to explore larger issues of historical theory and, through the prism of historical painting, reflects on the problem of representation and narrativist approaches to history as text. The article argues that the historiographic desire surfacing in a comparison with painting does not concern painting's ability to capture the past; rather, it concerns its ability to capture the viewer. Opening with a brief survey of the ut pictura historia analogy in the history of historiography, the article makes this claim by analyzing historiographical engagements with the analogy in antiquity (turning to Herodotus and Polybius) and by exploring ancient history painting itself (offering pride of place to the Alexander Mosaic). In thus engaging with the theory of historiography via concrete historical material, the article leverages a historical episode of interaction between textual media and visual media to find that they are structured by the same simple desire that continues to exert its force today: the desire to see for oneself.

Drift damage limit estimation based on cracks of concrete gravity dam considering dam-foundation interaction

ABSTRACT This study focuses on estimating the drift limits associated with different damage states of concrete gravity dams, emphasizing the role of cracks along the dam base and the interaction between the dam and its foundation. Employing a comprehensive framework and nonlinear pushover analysis, the research accounts for uncertainties in concrete and foundation material parameters, evaluating three distinct models with varying height-to-base width ratios (1, 1.25 and 1.5) through 20 runs based on central composite design. The findings indicate that as the height-to-base width ratio increases, the concrete gravity dam demonstrates greater resilience against lateral movements, highlighting its ability to withstand larger drifts without incurring damage. Additionally, the study’s proposed mathematical model accurately predicts the drift limits across different levels of damage, facilitating a comprehensive understanding of the structural behavior and its implications for seismic risk assessments. The research underscores the significance of considering the varying degrees of damage and their impact on the concrete gravity dam’s operational capability and safety, offering crucial insights for ensuring the integrity and stability of these essential infrastructures.

Numerical computation of heat transfer, moisture transport and thermal comfort through walls of buildings made of concrete material in the city of Douala, Cameroon: An ab initio investigation

The buildings of the city of Douala in Cameroon have been experiencing degradation for several decades due to the climate characterized by high humidity and oppressive heat. As a result, large grayish or black stains can be observed on these buildings. We sometimes witness the subsidence of the slab of the balconies, the cracking of the walls and the collapse of the buildings worn by the humidity. These damages are generally caused by infiltration and capillary rise. In addition, it has been demonstrated that people living in damp buildings are at risk of illnesses such as asthma and lung infections. Therefore, the novelty of this work is threefold: (i) it proposes for the very first time a numerical study of the transport of humidity and heat through the porous walls of buildings constructed with concrete material, the main construction material in the city of Douala; (ii) It was determined what level of indoor thermal comfort was appropriate for sleeping inside a real three-dimensional G+1 complex residential building constructed with concrete blocks; and (iii) Using the geographical coordinates, and time data, the sun radiation's direction of incidence was assessed throughout the simulation. The computation was performed using Comsol Multiphysics 6.0 software. The distributions of temperature, relative humidity as well as moisture level were presented at various periods. It appears from the results that face to this high humidity, the concrete material retains a large quantity of water for a considerable periods of time, which weakens the steel reinforcement of concrete which is corroded by rust. The computation of thermal comfort in the 3D building showed that the various rooms of the building were not comfortable during the night since temperature inside the building increased progressively due to diffusion of heat. In addition, the numerical solutions indicated that the energy stored within the walls diffused from the external walls to the internal walls during the night. It was also demonstrated that the walls of the building were warmer than the windows, doors and the roof at the computational times, which simply revealed a greater storage capacity of heat in the concrete blocks material. The findings highlighted that the temperature decreased rapidly in a thickness of 0.06 m of the concrete block during the nine days and this decrease was attenuated in the second part of the thickness of the concrete block (0.14 m).

A Review on the Recycling Waste Materials for Green Concrete

This has increased the generation of solid waste, creating environmental and economic problems on an international scale. The construction industry, one of the major environmental degrading and resource-consuming industries, plays a major role. This study examines how waste material is used in green concrete as a sustainable solution to minimize environmental burdens and save natural resources. Utilizing waste material such as silica fume, fly ash, recycled aggregates, and ground-granulated slag from blast furnaces (GGBFS), recycled plastic, and biopolymers, green concrete minimizes carbon emissions as well as reduces the need for virgin materials. In this paper, it is discussed how the application of such waste products in green concrete minimizes the carbon footprint and saves natural resources, whereas on the other hand, it also saves material and construction costs. Life cycle assessment studies and sustainability analysis give a valuable comparison in overall sustainability between green concrete and conventional concrete. Challenges and future directions in this field elucidate the uniformity of waste material quality, regulatory support, and public acceptance. The scope of further research lies in the development of material characterization, long-term durability studies, and technological advancement, which promise to deliver desired performance and applications of green concrete.

Water Dams: From Ancient to Present Times and into the Future

Since ancient times, dams have been built to store water, control rivers, and irrigate agricultural land to meet human needs. By the end of the 19th century, hydroelectric power stations arose and extended the purposes of dams. Today, dams can be seen as part of the renewable energy supply infrastructure. The word dam comes from French and is defined in dictionaries using words like strange, dike, and obstacle. In other words, a dam is a structure that stores water and directs it to the desired location, with a dam being built in front of river valleys. Dams built on rivers serve various purposes such as the supply of drinking water, agricultural irrigation, flood control, the supply of industrial water, power generation, recreation, the movement control of solids, and fisheries. Dams can also be built in a catchment area to capture and store the rainwater in arid and semi-arid areas. Dams can be built from concrete or natural materials such as earth and rock. There are various types of dams: embankment dams (earth-fill dams, rock-fill dams, and rock-fill dams with concrete faces) and rigid dams (gravity dams, rolled compacted concrete dams, arch dams, and buttress dams). A gravity dam is a straight wall of stone masonry or earthen material that can withstand the full force of the water pressure. In other words, the pressure of the water transfers the vertical compressive forces and horizontal shear forces to the foundations beneath the dam. The strength of a gravity dam ultimately depends on its weight and the strength of its foundations. Most dams built in ancient times were constructed as gravity dams. An arch dam, on the other hand, has a convex curved surface that faces the water. The forces generated by the water pressure are transferred to the sides of the structure by horizontal lines. The horizontal, normal, and shear forces resist the weight at the edges. When viewed in a horizontal section, an arch dam has a curved shape. This type of dam can also resist water pressure due to its particular shape that allows the transfer of the forces generated by the stored water to the rock foundations. This article takes a detailed look at hydraulic engineering in dams over the millennia. Lessons should be learned from the successful and unsuccessful applications and operations of dams. Water resource managers, policymakers, and stakeholders can use these lessons to achieve sustainable development goals in times of climate change and water crisis.

A Comparative Cost Analysis and Environmental-Mechanical Assessment of Conventional and Sustainable Concrete and Steel Reinforcement Materials

A Comparative Cost Analysis and Environmental-Mechanical Assessment of Conventional and Sustainable Concrete and Steel Reinforcement Materials

The uniaxial compressive strength of concrete: revisited

This paper re-examines common notions and conventions regarding the compressive strength of concrete in general and of the uniaxial compressive strength of concrete in particular. A distinction is introduced between the strength of the specimen and the strength of the concrete as a material, and the commonly measured and adopted strength is shown to be the specimen’s strength, wrongly interpreted as the material’s strength. the two major damage modes of concrete specimens (with the formation of either longitudinal cracks or shear bands) are discussed. Such failure modes are wrongly considered as features of concrete behavior in uniaxial compression, but this is not the case. Longitudinal cracking is due to lateral expansion (Poisson’s effect) and occurs at a relatively low applied load in absence of friction at specimen’s top and bottom boundaries. Shear failure (accompanied by the formation of an inclined shear band) is related to the shear envelope parameters that are related to the concrete mixture, but the applied ultimate pressure is not the concrete uniaxial compressive strength. Hence, though caused by applied compressive loading, these failure modes are little/hardly related to the concrete material intended as the ultimate uniaxial stress (strength) corresponding to a maximum value of the uniaxial compressive strain. Using the shear envelope parameters has been proven to yield a very good prediction of the applied compressive loading of the specimen in the limit state, as a demonstration that the applied pressure at specimen’s failure resulting from the formation of inclined fracture bands is the specimen’s failure strength, and not the material’s compressive strength! Reasons are given against the existence of a uniaxial compressive strength failure for concrete, and a piece of evidence in this direction is provided by concrete specimens subjected to pure hydrostatic compression, that do not fail at all. The entire issue requires, therefore, a deep revisiting and re-thinking, to provide correct measures for representing concrete response under compression in analysis and design.

Non-destructive testing method of concrete based on piezoelectric sensor

Abstract This paper reviews the research and development of non-destructive techniques for monitoring concrete in the past. Active detection techniques, particularly Electro-Mechanical Impedance method and Wave Propagation method have been demonstrated to be effective in monitoring the concrete process. Electro-Mechanical Impedance method detects internal structural damage by analyzing the vibration characteristics of the structure by combining a piezoelectric transducer with the system to be measured. Compared to the Electro-Mechanical Impedance method, the fluctuation method uses two or more transducers, with one serving as an exciter to actively excite the signal. In contrast, the others form an array to receive the stress wave signal. This method offers several advantages, including the absence of dependence on an impedance meter and passive excitation, a simple operating principle, high response frequency, and high immunity to interference. In this work, the research status and progress in the field of non-destructive testing (NDT) of concrete are combined to summarize the results and refine the methodology of the research on the evaluation of concrete material properties and identification of structural damage; based on this, the bottlenecks, research difficulties and difficulties in the field are further outlined, and finally, the research outlook of NDT of concrete in response to these limitations is put forward.

Taguchi Method for Optimizing Economic Product Selling Prices in MSMEs Concrete Industry

This article examines research related to determining the economic selling prices for concrete brick products at Karunia MSMEs, with the aim of optimization for production cost while still maintaining process quality. The method used in this research is Design of Experiment (DoE) based, namely Taguchi with regression, then continued with cost analysis to determine the optimal cost of production for efficiency. The technique in this method uses 3 variables, there are sand, cement and the length of time for mixing the concrete mixture with the quality parameters and production costs of the concrete bricks. Based on the experimental results, in achieving the goal of increasing cost efficiency, through sensitivity analysis it was obtained that the optimal composition of the cost of production was IDR 5,000 per piece of concrete brick, while maintaining SNI quality standards in optimal results of compressive strength is 117.37 kg/cm2, water permeability is 7.77% and roughness is 52.42 µm. The cost of production is the same as the initial cost of production before composition optimization efforts are carried out, where the initial concrete brick product is indicated as not meeting SNI quality standards because it has a compressive strength value below standard. The results of this research are expected to be able to provide recommendations for economic selling price for concrete brick by production costs optimizing while maintain the SNI standard quality of concrete brick products.

Application of Scheffe's Simplex Lattice Model in concrete mixture design and performance enhancement

This comprehensive literature review delves into the application of Scheffe's Simplex Lattice Model for optimizing cement concrete mixtures, with a particular emphasis on its impact on material properties and sustainability. The review meticulously outlines the principles, historical context, and advantages of Scheffe's model, providing a nuanced understanding of its significance. Comparative analyses with traditional and alternative optimization techniques in concrete mix design illuminate the distinct advantages of statistical methods, especially Scheffe's model. The review critically examines the challenges and limitations associated with applying Scheffe's model, addressing issues related to the complexity of concrete mixtures and computational demands. Potential avenues for improvement are explored, suggesting refinements to handle non-linearity, incorporate advanced optimization algorithms, and streamline computational requirements. Additionally, the review highlights emerging trends in statistical modeling for concrete mixture optimization, such as the integration of machine learning and data-driven approaches, signaling the evolving landscape of concrete technology. In conclusion, the literature underscores Scheffe's Simplex Lattice Model as a valuable and versatile tool with far-reaching implications for the advancement of concrete mixture design methodologies. The call to action encourages ongoing research and development to refine the model, explore emerging trends, and address practical challenges, positioning Scheffe's model as a cornerstone in the pursuit of sustainable, resilient, and high-performance concrete materials. The study highlights Scheffe's Simplex Lattice Model as a robust statistical tool for optimizing cement concrete mixtures, demonstrating its efficacy in improving performance indicators like compressive strength and durability. This systematic approach offers a paradigm shift from empirical methods, fostering a nuanced understanding of concrete components' relationships and paving the way for tailored material properties and enhanced sustainability in construction. The call to action urges further research to refine the model, address challenges, and explore hybrid approaches, ultimately advancing concrete mixture design methodologies towards greater efficiency and precision.

Experimental Study on the Detection of the Existence and Location of Mimicked and Unexpected Interface Debonding Defects in an Existing Rectangular CFST Column with PZT Materials.

Interface bonding conditions between concrete and steel materials play key roles in ensuring the composite effect and load-carrying capacity of concrete-steel composite structures such as concrete-filled steel tube (CFST) members in practice. A method using both surface wave and electromechanical impedance (EMI) measurement for detecting the existence and the location of inaccessible interface debonding defects between the concrete core and steel tube in CFST members using piezoelectric lead zirconate titanate (PZT) patches as actuators and sensors is proposed. A rectangular CFST specimen with two artificially mimicked interface debonding defects was experimentally verified using PZT patches as the actuator and sensor. By comparing the surface wave measurement of PZT sensors at different surface wave travelling paths under both a continuous sinusoidal signal and a 10-period sinusoidal windowed signal, three potential interface debonding defects are quickly identified. Furthermore, the accurate locations of the three detected potential interface debonding defects are determined with the help of EMI measurements from a number of additional PZT sensors around the three potential interface debonding defects. Finally, the accuracy of the proposed interface debonding detection method is verified with a destructive observation by removing the local steel tube at the three detected interface debonding locations. The observation results show that the three detected interface debonding defects are two mimicked interface debonding defects, and an unexpected debonding defect occurred spontaneously due to concrete shrinkage in the past one and a half years before conducting the test. Results in this study indicate that the proposed method can be an efficient and accurate approach for the detection of unknown interface debonding defects in existing CFST members.

Assessment of the properties of interface-modified bamboo aggregates for sustainable concrete construction

To alleviate the serious loss of gravel resources, reduce carbon emissions and improve the sustainability of concrete materials, this study presents an innovative approach to develop a novel eco-friendly bamboo aggregate concrete. The proposed method involves utilizing the abundant and renewable Phyllostachys edulis (Moso) bamboo to create a new type of bamboo aggregate, as a substitute for conventional gravel aggregates. This study modified the bamboo surface using a composite effect of epoxy mortar and polyurethane adhesive to realize the direct application of bamboo aggregates. Compared to unmodified and polyurethane-modified bamboo, epoxy mortar-modified bamboo showed significantly improved physical and mechanical properties. Anti-corrosion properties tests revealed that the modified bamboo, especially epoxy mortar-modified bamboo, was less affected by acidic and alkaline corrosion than the unmodified bamboo and the mass loss rate was almost zero. In the early stages of alkaline corrosion, the strength of the bamboo increased, and then began to decrease after 28 d. The removal of the outer green bamboo significantly improved the adhesion of the adhesive to the bamboo surface, as confirmed by pull-out tests. A sufficient bonding area between the epoxy mortar-modified bamboo and the cement matrix remained after compression damage, whereas obvious debonding behavior between the cement matrix and unmodified and polyurethane-modified bamboo was observed. In summary, epoxy mortar modification significantly improved the comprehensive performance of bamboo aggregates. This study is expected to help improve the utilization rate of bamboo, promote bamboo concrete, and develop sustainable materials.

Magnesite Mine Waste as a Sustainable Binder for Low-Fines Self-Compacting Concrete: Engineering Property and Ecological Impact

<p>Mine waste management has become a global concern due to its environmental and health impacts, as well as the high cost of disposal. Recent advancements focus on recycling mine waste into resources using effective conservation methods and waste management systems. The building sector, a major consumer of natural resources, has seen studies on using waste materials in concrete. This study examined the feasibility of replacing cement with mine waste in two phases - binary blend (cement + mine waste) and ternary blend (cement + fly ash + mine waste) at 10%, 20%, and 30% doses. The study evaluated fresh properties like slump flow, T50 slump, V-funnel, J-ring, and L-box, and hardened properties like compressive, splitting tensile, and flexural strengths. It also investigated microstructural characteristics, cost, energy impact, and CO2 emissions. The results showed good performance in fresh characteristics for almost all mixtures but failure in hardened properties. The achieved strength was backed by microstructural analysis. Binary blended SCC reduced costs by 5%, energy by 25%, and CO2 emissions by 28%, while ternary blended SCC cut costs by 8%, energy by 32%, and CO2 emissions by 36%.</p>

An improved peridynamic model for mechanical behavior of steel-concrete interface

The steel–concrete interface is an important component of reinforced concrete (RC) materials, and accurately expressing the mechanical properties of the interface is crucial to the failure analysis of RC members. The unique superiorities of peridynamic (PD) theory in dealing with discontinuities make it extensively applied in the failure analysis of RC structures. This paper introduces a modified PD model for describing the mechanical behavior of the steel–concrete interface. The ideal microplastic PD model and bilinear PD model are applied to express the mechanical behavior of steel and concrete respectively. Furthermore, the strain rate effect of materials is also incorporated in the analysis of dynamic damage to RC members subjected to blast load. A parallel (OpenMP) program was developed using FORTRAN to implement the computation of the modified PD model. Finally, the modified PD model was utilized for the numerical simulation of the RC beam shear-flexural failure experiment and the RC slab explosion failure experiment. Research shows that the modified PD model can correctly describe the mechanical behavior of the steel–concrete interface.