Compressive Strength Ratio Research Articles

Compressive and shear response of fibre-reinforced backfill: impact of field temperature

Fibre-reinforced cemented paste backfill (F-CPB; a mixture of tailings, fibre, cement, and water) is exposed to non-isothermal curing environments in the field. However, no investigations have been conducted on the impact of non-isothermal curing environments on F-CPB compressive strength, shear characteristics and stress–strain behaviour, although these are important design parameters for F-CPB structures. Therefore, a series of mechanical and microstructural tests were performed on samples with and without fibres exposed to isothermal and non-isothermal conditions. It was found that the non-isothermal curing condition substantially enhances the F-CPB compressive strength and strength gain ratio. The shear strength, cohesion and internal friction angle of the F-CPB samples cured under non-isothermal conditions were higher than those cured under isothermal conditions. These impacts of non-isothermal curing on the compressive and shear characteristics of F-CPBs are related to the temperature-induced change in the microstructure of these samples. The F-CPBs cured under non-isothermal conditions had more hydration products than those cured under isothermal conditions. Moreover, mercury instrusion porosimetry (MIP) tests showed that the F-CPBs subjected to non-isothermal conditions had a finer pore structure than those exposed to isothermal conditions, which contributed to an enhancement of the mechanical characteristics of the F-CPBs subjected to non-isothermal curing.

Optimization of BP Neural Network Model for Rockburst Prediction under Multiple Influence Factors

Rockbursts are serious threats to the safe production of mining, resulting in great casualties and property losses. The accurate prediction of rockburst is an important premise that influences the safety and health of miners. As a classical machine learning algorithm, the back propagation (BP) neural network has been widely used in rockburst prediction. However, there are few reports about the influence study of different training sample sizes, optimization algorithms and index dimensionless methods on the prediction accuracy of BP neural network models. Therefore, 100 groups of typical rockburst engineering samples were collected locally and abroad, and considering the relevance, scientificity and quantifiability of the prediction indexes, the ratio of the maximum tangential stress of surrounding rock to the rock uniaxial compressive strength (σθ/σc), the ratio of the rock uniaxial compressive strength to the rock uniaxial tensile strength (σc/σt) and the elastic energy index (Wet) were chosen as the prediction indexes. When the number of samples was 40, 70 and 100, sixty improved BP models were established based on the standard gradient descent algorithm and four optimization algorithms (momentum gradient descent algorithm, quasi-Newton algorithm, conjugate gradient algorithm, Levenberg–Marquardt algorithm) and four index dimensionless methods (unified extreme value processing method, differentiated extreme value processing method, data averaging processing method, normalized processing method). The prediction performances of each improved model were compared with those of standard BP models. The comparative study results indicate that the sample size, optimization algorithm and dimensionless method have different effects on the prediction accuracy of BP models, which are described as follows: (1) The prediction accuracy value A of the BP model increases with the addition of sample size. The average value Aave of twenty improved models under three kinds of sample sizes increases from Aave (40) = 69.7% to Aave (100) = 75.3%, with a maximal value Amax from Amax (40) = 85.0% to Amax (100) = 97.0%. (2) The value A and comprehensive accuracy value C of the BP model based on four optimization algorithms are generally higher than those of the standard BP model. (3) The improved BP model based on the unified extreme value processing method combined with the Levenberg–Marquardt algorithm has the highest value Amax (100) = 97.0% and value C = 194, and the prediction results of five engineering cases are completely consistent with the actual situation at the site, so this is the best BP neural network model selected in this paper.

Microstructure and Solidification Behavior of Co30Ni30Fe30Zr10 Eutectic Multi‐Principal Element Alloy

Herein, the Co30Ni30Fe30Zr10 eutectic multi‐principal element alloy is prepared by vacuum arc melting. The phase composition and microstructure of eutectic alloy are analyzed by X‐ray diffraction (XRD) and scanning electron microscope (SEM). It is showed in the results that the eutectic multi‐component alloy is composed of primary phase and eutectic structure, in which the primary phase is Fe‐rich phase, and the eutectic structure is mainly composed of face‐centered cubic (FCC) and body‐centered cubic (BCC) phases. Co30Ni30Fe30Zr10 eutectic multi‐component alloy possesses good room‐temperature mechanical properties. Its yield strength, compressive strength, and compression ratio are 700, 1000 MPa, and 22%, respectively.

Impact of Failure-surface Parameters of Concrete Damage Plasticity Model on the Behavior of Reinforced Ultra-high Performance Concrete Beams

The failure surface of elements can numerically represent by a concrete damage plasticity (CDP) model in Abaqus software which depends on five parameters. The parameters are eccentricity, shape, biaxial to uniaxial compressive strength ratio, dilation angle, and viscosity. This paper studies the effect of changing the values of the failure surface parameters on the bearing capacity, deflection, and overall structural behavior of ultra-high performance concrete (UHPC) beams. The parameters' changes include reasonable values higher or lower than the values adopted by Abaqus. An experimentally performed reinforced UHPC beam is simulated by Abaqus, and the five parameters are calibrated to coincide with the practical results. Then, one of the parameters is changed while others remain constant for each alteration to study its effect on the UHPC beam behavior. The numerical analysis results show that all five parameters do not affect the loading capacity and the corresponding deflection at the first cracking state. At peak state, the eccentricity does not affect the load and deflection. The influence of shape and the biaxial to uniaxial compressive strength ratio are confined to the deflection at peak load only without affecting the bearing capacity. The dilation angle effect appears when it is greater than 30 degrees to 56 degrees, while when it is less than 30, it does not affect the load and deflection. Rising the dilation angle and viscosity value promotes the peak load and the deflection.

Degradation Mechanism of Coal Gangue Concrete Suffering from Sulfate Attack in the Mine Environment.

Recycling coal gangue as aggregate to produce concrete in situ is the most effective way to solve the problem of deposited coal gangue in mines. Nevertheless, the mine environment underground is rich in sulfate ions, posing a threat to the durability of coal gangue concrete (CGC). Hence, the degradation process of sulfate-attacked CGC is investigated. A series of tests is performed to evaluate its variation law of mass, dynamic elastic modulus, compressive strength and sulfate ion distribution. Meanwhile, the microstructure and phases of sulfate-attacked CGC are identified by scanning electron microscopy, X-ray diffraction and thermogravimetric analysis. The results indicate that the residual compressive strength ratio of CGC is higher than that of normal concrete after a 240 d sulfate attack, implying a superior sulfate resistance for CGC. Additionally, the higher the sulfate concentration, the more severe the degradation. Except for the secondary hydration of CGC itself, the diffused sulfate ions also react with Ca(OH)2, forming gypsum and ettringite; this plays a positive role in filling the pores at the early stage, whereas, at the later stage, the generated micro-cracks are detrimental to the performance of CGC. In particular, the proposed sulfate corrosion model elucidates the degradation mechanism of CGC exposed to a sulfate-rich environment.

Study on the Relationship between Early Shrinkage Cracking and Mechanical Properties of Nano-Clay Cement Mortar Based on Fractal Theory

In order to study the influence of nano-clay on the crack resistance of cement-based materials, two kinds of nano-metakaolin (NMK) and two kinds of nano-attapulgite clay (NMA) were considered. The early cracking process and mechanical properties of nano-clay cement mortar (NCM) was studied by using a plate knife-edge constraint test. Based on fractal theory, the distribution characteristics of NCM surface cracks were revealed, and the calculation method forNCM maximum crack width was given. The results show that the cracking time of the NMK-3 specimen is 2 and 6 h later than that of NMK-1 and NMA-2, respectively; the smaller the particle size of nano-clay, the earlier the cracking time of the specimen. However, nano-clay effectively inhibited the expansion of mortar cracks, and the cracks on the surface of NCM were thin and sparse. At 28 days, the maximum crack width of NMK-3 was 46.7% and 33.3% lower than that of NMK-1 and NMA-2, respectively. NMK hadthe best improvement effect on the mechanical properties cement mortar. The smaller the particle size, the more pronounced the improvement effect.The flexural strength ratio and compressive strength ratio at 7 and 28 days are 76.7%, 67.4%, and 61.2%, respectively.The distribution of surface cracks on NCM has fractal characteristics, and the fractal dimension of surface cracks is smaller than that of ordinary cement mortar. The larger the particle size of nano-clay, the smaller the fractal dimension of cracks. The quantitative relationship between fracture fractal dimension and NCM elastic modulus and shrinkage tensile stress is established.

Experimental investigation on compressive strength and acid resistance of autoclaved aerated concrete using GGBS

The objective of this paper is to produce Autoclaved aerated Concrete (AAC) by using Ground Granulated Blast Furnace Slag (GGBS) as the partial replacement of the fly ash. AAC has emerged as one of the most prominent sustainable material because of its benefits such as fire resistance, light weight and high workability etc. Proportioning the mix components for AAC is a most important step in generating high-strength AAC block. The GGBS have been replaced at 24%, 30% and 36% of the total weight and have been tested for compressive strength, water absorption and acid resistance. The experimental results have shown that there has been an increase in compressive strength by 28–44% when compared to conventional AAC block and in acid resistance tests, the ratio of weight reduction and compressive strength declined as GGBS increased. It is been found that the block is eco-friendly as it contains non-toxic materials and the waste generated from industries. It can be used for constructing low load bearing structures and as the block is light weight material, it decreases the dead load of the structure.

Design and development of light weight porous matrix using industrial waste

The aim of the current study is to optimise the composite mixture of fly ash, rubber waste and Ordinary Portland Cement (OPC)for the design and development of a light weight porous matrix. The composite matrices have been evaluated based on the engineering properties consisting of compressive strength, density, open porosity (VR%) and water-material ratio (WM%). The Scanning Electron Microscopy (SEM) is used for the observation of the microstructure of cement, tyre rubber granules, fly ash and the optimized composite matrix. The compressive strength and density decrease with the increasing quantity of waste tyre rubber granules in the matrix, whereas the porosity of the matrix enhances. Since, the rubber granules act like voids in the composite matrix, results into the development of light weight porous matrix, which is also confirmed by SEM analysis. The study confirms the usability of the composite matrix aslow-cost partition walls or low load bearing structures. The utilization of the waste material reduces the land requirement for huge disposal site as well as reduces the carbon footprint due to the reduced utilization of cement. The composite matrix can be further utilized through proper design mix with additional construction materials such as fine and coarse aggregate to broaden the applications horizon in civil and environmental engineering.

Development of a complementary precursor based on flue gas desulfurization (FGD) for geopolymeric pastes produced with metakaolin

Portland cement production is related to environmental problems and corresponds to about 6–8% of CO2 emission. Thus, it is necessary to search for sustainable material. Among these materials are geopolymers. The objective of this research was to analyze the potential of producing a geopolymeric paste based on metakaolin (MK) and Flue Gas Desulfurization (FGD) residue. First, the specimens were prepared with a curing time of 7 days in two types, one ambient and the other thermal at 65 °C. After that time, tests were carried out in the hardened state of compressive strength, bulk density, water absorption and void ratio. Tests were also carried out with the mixture in the fresh state, through tests of consistency index, mass density and incorporated air, water retention and calorimetry. Finally, the characterization of the samples was carried out through X-ray diffraction (XRD) and scanning electron microscopy (SEM). The compressive strength results showed that the best compositions were 100% MK (0%FGD) and 95% MK (5% FGD) residue with thermal cure at 65 °C. The values found were 47.65 MPa and 28.44 MPa, higher than the values of the main structural standards. These results were attributed to the formation of sodalite and faujasite phases in the compositions of 100% MK and 5% of FGD residue and the non-formation of ettringite, as happened with the other two compositions. Thus, the geopolymeric pastes showed compressive strength values for reinforcement of structures with the use of MK as a precursor and its replacement of 5% by the FGD.

Predicting ultimate condition and transition point on axial stress–strain curve of FRP-confined concrete using a meta-heuristic algorithm

Accurately predicting key reference points on the axial stress-strain curve of fiber-reinforced polymer (FRP)-confined concrete is of great importance for the pre-design and modeling of structures manufactured with this composite system. This paper presents a detailed study on the development of accurate and practical expressions for predicting the ultimate condition and transition point, as key reference points, on axial stress-strain curves of FRP-confined concrete using generic programming (GP). A comprehensive data tuning and cross-validation analysis was firstly performed to develop prediction models. Afterwards, the accuracy and performance of the developed empirical expressions were examined by sensitivity analysis, parametric analysis and model validation. Finally, a comparison was made between the performance of these proposed expressions and that of the existing best-performing expressions in the literature using statistical analysis. Based on the sensitivity and parametric analysis of the database, it is shown that: compressive strength ( f’ cc ) and axial transition strain ( ɛ c1 ) are more sensitive to FRP lateral stiffness ( K l ); ultimate axial strain ( ɛ cu ) is more sensitive to K l -to-unconfined compressive strength ( f’ co ) ratio and fiber ultimate tensile strain ( ɛ fu ); hoop rupture strain ( ɛ h,rup ) is more sensitive to fiber elastic modulus ( E f ); and axial transition strength ( f’ c1 ) is more sensitive to f’ co . It is also shown that the proposed expressions provided more accurate predictions of the ultimate condition and transition point on the axial stress-strain curve of FRP-confined concrete than the existing expressions. This was achieved by using a larger number of datasets and accurately capturing the effects of the most influential input parameters in the proposed expressions.

Numerical investigation on DE-strengthened-RC beams without steel shear reinforcement

This study presents a two-dimensional nonlinear finite element (FE) model for Deep Embedment (DE) strengthened reinforced concrete (RC) beams without existing steel shear links. The FE model was developed and validated against experimental results reported in published literature. The parametric study was thereafter conducted to examine important parameters influencing the strengthened behavior. The parameters were concrete compressive strength, beam width, beam size, and tension reinforcement ratio. The FE model accurately predicted experimental results with a mean predicted-to-experimental value of 1.04. The FE results showed that the percentage of shear strength provided by embedded steel bars was almost constant once both concrete strength and tension reinforcement ratio were increased. However, an increase in the beam width resulted in a decrease in the percentage of shear strength gain due to embedded steel bars. Shear stress at failure decreased once beam size was increased for both unstrengthened (control) and DE-strengthened beams. The percentage of shear strength provided by embedded steel bars decreased from 47.9% to 27.6% as effective depth was increased from 261.5 mm to 523 mm.

Mechanical Property and Dimensional Stability of Chopped Basalt Fiber-Reinforced Recycled Concrete and Modeling with Fuzzy Inference System

The rising amount of construction and demolition wastes (C & DWs) is triggering serious environmental and social problems globally. This study conducted an experimental investigation of basalt fiber (BF)-reinforced concrete with recycled aggregates (RAs) sourced from C & DWs. The flexural strength, the flexural to compressive strength ratio, and the drying shrinkage are set as indicators for the evaluation of the coupling effect of BF and RA in concrete. Results show that BF generated a significant effect on the flexural strength until the BF dosage was no higher than 1%. The excessive mixing amount of BF, though it still contributed to a positive effect on elevating the flexural strength, was of a reduced utility. Regarding the flexural to compressive strength ratio (denoted as ratio), BF and RA jointly produced a positive synergistic effect. In addition, the BF was verified as competent in curbing the adverse effect of RA incorporation upon the drying shrinkage. Relative to the benchmark concrete which contains 100% RA and no BF, 1% BF contributed to a 31.6% reduction in the drying shrinkage. The results prove that BF reinforcement is a feasible and promising approach to curb the drawbacks of RA concrete.

Flexural performance of steel-reinforced geopolymer concrete one-way slabs: Experimental and numerical investigations

This paper investigated the out-of-plane flexural performances of ambient-cured steel-reinforced slag and fly ash-based geopolymer concrete one-way slabs, in which the activator was the blend of NaOH and sodium silicate solutions (SiO2/Na2O = 3.1–3.3). Twelve specimens were prepared and tested, which included six OPC concrete specimens. The test parameters were concrete type (i.e., geopolymer and ordinary Portland cement (OPC) concrete), concrete compressive strength (i.e., 30 MPa, 40 MPa, and 50 MPa) and longitudinal tensile reinforcement ratio (i.e., 0.82 % and 1.20 %). The failure modes, crack patterns, load–deflection relationships and load–strain relationships of all specimens were carefully studied and reported. Further, a two dimensional (2D) finite element (FE) analysis was conducted to validate the test results. The results of the study indicated that: (1) the geopolymer concrete specimens presented lesser crack width and crack spacing owing to the improved bond between rebar and geopolymer concrete; (2) the cracking load and initial stiffness of geopolymer concrete specimens were slightly lower than that of OPC concrete counterparts; (3) the current Codes of Practice GB50010-2010 and ACI 318-19 provided reasonable predictions of the cracking load and flexural load capacity of the steel-reinforced geopolymer concrete specimens; (4) the developed FE model provided a good prediction of the flexural performance of the tested slabs, and could be used for further parametric investigation.

Effects of aging treatment on microstructure and mechanical properties of non-equiatomic high entropy alloy

In this study, the cryogenically-processed FeCoNi1.5CuB0.5Y0.2 HEAs (high-entropy alloys) were subjected to aging treatment, such as different aging temperatures T (unaged sample, 700 °C, 750 °C, 800 °C), aging times t (unaged sample, 10 h, 12 h, 14 h) and the aging cycles N (unaged sample, one time, two times, three times). Under this condition, the changing laws of microstructure and mechanical properties of HEAs were explored. According to the experiment, with the increase of the aging temperature, the prolongation of the aging time or the growth of the number of aging cycles, the overall mechanical properties of the material have been significantly improved. In particular, when the aging conditions were T = 750 °C, t = 12 h, and N = 2 times, the grain size of the optimized sample was reduced, and a large number of finely dispersed precipitates appeared, which can produce excellent strong-plastic synergy. Further analysis revealed that the complex interacting multi-component in the HEA constitute the heterogeneity level of the microstructure and also lead to effective multi-component strengthening. Especially in the samples after optimized aging parameters (DCAT 7), the activated back stress at boundaries of grains and the synergistic effect of nanoparticles and twins contribute to high strain hardening. In terms of micromechanical characteristics, the modulus of elasticity and nanohardness of each phase were obviously enhanced. In terms of macroscopic mechanical properties, Vickers hardness, compressive strength and maximum compression ratio also reached their maximum values, which were 53.4%, 19.6% and 43.5% higher than those of the single cryogenic sample, separately. Obviously, the overall strength-ductility has been improved simultaneously.

Enhanced longitudinal compressive strength of CFRP composites with interlaminar CNT film prepreg from hot-melt pre-impregnation

High strength, high modulus and the balance of compressive and tensile strength gradually became the main development goals of advanced CFRP composites. However, the low ratio of compressive and tensile strength of CFRP composites have limited the application as structural materials in aerospace field. In this study, CNT film prepreg (CNT-f-p) was prepared by hot-melt pre-impregnation and used to fabricate the interlayer stiffened and reinforced CFRP composites with enhancement of compressive strength, and the effect of CNT-f-p on longitudinal compressive strength and elastic-plastic failure mechanism of composites were firstly investigated from the experimental results and theoretical model. The tensile strength and modulus of CNT-f-p were enhanced due to sufficient and uniform infiltration of CNT network by resin matrix. The interlaminar shear strength and in-plane shear modulus of CFRP/CNT-f-p composites were improved due to effective CNTs bridging and riveted CNTs between resin and fiber in interlaminar region of composites. The compressive strength of CFRP/CNT-f-p composites was enhanced by 13.2%, showing a consistency with predicted results of Jumahat's combined model, which ascribed to restricted kink-band formation and avoided interface delamination during elastic-plastic compression process of composites from improved transverse support and interfacial adhesion. Consequently, this work presented a potential application in fabrication of CFRP composites with high compressive strength.

Facile Synthesis of Formaldehyde-Free Bio-Based Thermoset Resins for Fabrication of Highly Efficient Foams

Bio-based biodegradable foams were formulated from a crosslinkable network structure combining starch, furfuryl alcohol, glyoxal, and condensed tannin in the presence of p-toluenesulfonic acid (pTSA) and azodicarbonamide (AC) as a foaming agent. More importantly, the reinforcement of gelatinized starch-furanic foam using tannin, originating from forestry, resulted in an excellent compressive strength and lower pulverization ratio. Moreover, the addition of tannin guaranteed a low thermal conductivity and moderate flame retardancy. Fourier transform infrared (FTIR) spectroscopy approved the successful polycondensation of these condensing agents under the employed acidic conditions. Moreover, the catalytic effect of pTSA on the foaming agent induced liberation of gases, which are necessary for foam formation during crosslinking. Scanning electron microscopy (SEM) showed foam formation comprising closed cells with uniform cell distribution and appropriate apparent density. Meanwhile, the novel foam exhibited biodegradation under the action of Penicillium sp., as identified by the damage of cell walls of this foam over a period of 30 days.

Effect of imitation fair-faced curing and protective coating on the durability of concrete

The insufficient curing and protection of fair-faced concrete results in its poor durability and decorative effect, thus probably causing substantial economic loss. In order to improve the durability and decoration of the concrete, the self-made imitation fair-faced concrete curing and protective coating was used to protect the concrete from degradation. The properties of the concrete with self-made imitation fair-faced coating were compared with two commercial curing and protective coatings. Experimental results reveal that the water retention rate and 28 d compressive strength ratio of concrete using nano-modified imitation fair-faced concrete curing and protective coating were 91.7% and 95.3% respectively. Besides, the water absorption rate was 16.9%, the contact angle was 141.99° and the chloride absorption reduction rate was 75.5%. XRD and SEM-EDS showed that more hydration products such as CH were generated, indicating a high degree of hydration. The imitation fair-faced concrete curing and protective coating has the effect of inner curing and outer protection and improves the durability of concrete.

A comparative study on mechanical properties and environmental impact of UHPC with belite cement and portland cement

Developing an eco-friendly UHPC with Belite cement (BC) is a great challenge because the mechanical strength of concrete with BC develops much more slowly than Ordinary Portland cement (alite-rich cement, OPC). However, BC has a lower CO2 footprint than OPC due to a lower calcined temperature and less limestone demand, making it green cement. Besides, concrete with BC has better long-age performance. In this study, the utilization of BC in UHPC was compared to that of OPC. Three curing regimes were used for the designed UHPC. The compressive and flexural strengths of UHPC-BC are lower than of UHPC-OPC at one day but higher after 28 and 90 days of standard curing. After heat curing, the mechanical strength development of UHPC-BC improves noticeably and exceeds UHPC-OPC. UHPC-BC has a higher flexural strength to compressive strength ratio (ff/fcu), and there are more C–S–H, less CH and lower pore coarsening of UHPC-BC paste than UHPC-OPC, especially after heat curing. UHPC-BC has lower environmental impact indices at long age than UHPC-OPC. At 90 days of autoclaved curing, the compressive of UHPC-BC reaches up to 197.5 MPa with the embodied carbon content of 934.37 kg/m3, which is much lower than most UHPCs.

STUDY ON PERVIOUS CONCRETE PAVING BLOCK CONTAINING PLASTIC WASTE TYPE PET AS A SAND REPLACEMENT

This study reports the effects of using plastic waste type PET (Polyethylene Terephthalate) as sand replacement in the manufacture of pervious concrete paving block to be applied for low-traffic volume roads, parking areas and pedestrian walkways. The PET plastic aggregates were prepared through the pre-heated method under 150-180°C and then crushed into pieces to partially replace the sand content in concrete paving block mixtures at percentage of 5%, 10%, 20% and 30% by wt. of total sand. The experimental studies were conducted on concrete paving block (size 210x110x60 mm3) containing PET plastic waste aggregate. The coarse aggregate to cement ratio used was 4:1 while the fine aggregate to cement ratio was 1.5:1. The properties of concrete paving block specimens were evaluated based on the compressive strength, flexural strength, and void ratio results after curing. From the results obtained, it can be concluded that the maximum of percentage when using plastic waste type PET was 5% by wt. of sand. The mechanical properties and void ratio of the concrete paving block showed that the utilization of plastic waste type PET as construction material has potential contribution in improving the pavement structure and offering sustainable solution on environmental issue.

An Experimental Study on the Preparation of Soft Rock Similar Materials Using Redispersible Latex Powder as a Modifier.

The engineering geological problems of soft rock are common in large slope engineering and underground engineering surrounding rock. In order to study the change in mechanical properties of soft rock under the action of loading, excavation and rainfall, this paper carried out experimental research on similar materials of soft rock. The similar material of soft rock is prepared by using iron fine powder, barite powder and quartz sand as aggregate, gypsum as binder and redispersible latex powder as regulator. A single-factor influence test was designed with the content of redispersible latex powder as variation parameter. Analysis the influence of redispersible latex powder from the perspectives of physical and mechanical indexes, failure forms, stress-strain states and changes after water seepage. In addition, evaluate the feasibility of this similar material in geomechanical model test. Experimental results show that the density, compressive strength and Poisson's ratio of similar materials can be improved to a certain extent by the redispersible latex powder with low dosage. However, the above indexes show a significant downward trend with the increase in dosage when the dosage exceeds 2%. The deformation modulus always shows a downward trend, and this trend becomes more significant especially when the dosage exceeds 2%. With the increase in the redispersible latex powder, the stress-strain curves of similar materials show obvious elastic and plastic stages. The failure mode gradually changes to X-shaped conjugate failure, which is common in soft rock, and the material changes from brittle failure to plastic failure. In addition, this type of similar material with gypsum as cementing agent will cause serious damage and loss of bearing capacity after seepage. These methods produce similar materials with low strength, low deformation modulus and plastic failure form, which can be used to simulate the stability of soft rock engineering caused by loading or excavation. At the same time, it also sheds lights on preparing similar materials of hard rock.