Properties Of Rubberized Concrete Research Articles

Damage Characteristics of Uniaxial Compressed Concrete Embedded Different Aging Rubber by 3D Mesoscale Model

Rapid development of the automobile industry has brought the disposal problem of waste rubber tires. Mixing waste rubber tires into concrete can not only solve environmental problems but also improve the mechanical properties of concrete. Rubber aging is one of the main factors to affect the mechanical properties of rubberized concrete. Therefore, an FEM model of rubberized concrete in mesoscale is established in this paper. The influence of rubber aging on the uniaxial compression damage of rubberized concrete is u;studied. The results show that (1) the elastic modulus and compressive strength of rubberized concrete are negatively correlated with the aging level and content of rubber and positively correlated with the particle size of rubber. (2) After uniaxial compression of concrete enters the softening section, the crack resistance of concrete is positively correlated with the aging level and content of rubber and negatively correlated with the particle size of rubber. (3) Compared with the elastic modulus, the compressive strength of rubberized concrete is more sensitive to the change of parameters of rubber, that is, the change range of the compressive strength of rubberized concrete is always greater than the change range of its elastic modulus, when the aging level, content, and particle size of rubber change.

Performance of sustainable concrete containing recycled latex gloves and silicone catheter under elevated temperature

Due to its environmental, economic, and durability advantages, sustainable concrete has considerably increased the potential of research in recent years. This paper investigates how rubber waste affects the mechanical properties, durability, and microstructure of the concrete matrix. Industrial rubber such as ground latex gloves (LG) and silicone catheters (SC), are substituted for coarse aggregate in concrete mixes. Workability, density, compressive strength, water absorption, ultrasonic pulse velocity, and scanning electron microscope (SEM) tests are applied to examine the performance and properties of the modified concrete. The impact of high temperatures on concrete containing industrial rubber is also examined. To achieve this objective, the samples are tested at normal and high temperatures (room temperature, 200 °C, and 400 °C, respectively) and four substitution levels are used (2.5%, 5%, 7.5%, and 10%) by weight. The results illustrate that the inclusion of different percentages of the LG and SC significantly improves the water absorption of the concrete samples. In addition, the density of concrete containing recycled rubber decreases by 34%. Compressive strength decreased by 86% and 59% at a replacement level of 10% for LG and SC, respectively. High-temperature level has shown a significant effect on the properties of rubberized concrete. This study establishes the possibility of incorporating LG and SC at limited replacement levels in concrete; thereby, proving that these materials are applicable in industrial use.

Sustainable rubberized concrete mixed with surface treated PCM lightweight aggregates subjected to high temperature cycle

Porous aggregate can be used as a medium to carry phase change material (PCM) into cement materials. The benefits of using PCM aggregates (PCMA) include the ability to incorporate large amount of PCM (up to about 8% by weight of concrete) into concrete without compromising the mechanical properties. However, an important drawback is the leakage of PCM with time. In this study, the activated silica fume (ASF) is introduced as a surface coating material using a tumbling machine. The experimental series included the investigation on properties of PCMA and PCMA coated with ASF (ASF-PCMA) before and after being subjected to a number of heat/cool cycles, and the properties of rubberized concrete (RC) mixed with PCMA and ASF-PCMA. Results showed that the ASF coating was able to reduce the amount of PCM leakage by about 5.4 times after being subjected to 100 heat/cool cycles. The mechanical properties of RC mixed with ASF-PCMA was slightly better than those mixed with PCMA. For the thermal conductivity (K), ASF coating provides both positive and negative effects to the thermal conductivity of RC depending on the state of PCM that K was being measured. Because of less leakage, the loss in latent heat storage capacity of RC mixed with ASF-PCMA was less than those mixed with PCMA.

Effect of Water-Cement Ratio on Mechanical Properties of Rubberized Fly Ash Concrete

One of the efforts to reduce the dependency of concrete production on natural resources along with carbon reduction is by utilizing recoverable materials as concrete constituents such as crumb rubber from scrap tires and fly ash from industrial waste. This study aims to investigate the mechanical properties of rubberized fly ash concrete which utilized crumb rubber and fly ash as a replacement for a proportion of fine aggregate and cement, respectively. Crumb rubber was used to replace 5 and 10% fine aggregate while fly ash was used to replace 10% OPC by weight. Three different water-binder (w/b) ratio, 0.55, 0.50 and 0.45, were used. The concrete specimens were prepared and tested for their density, compressive strength, splitting tensile strength, and flexural strength. Result gathered from the experimental works show a reduction in properties of rubberized concrete when compared to conventional concrete. By using a lower w/b ratio, the reduction tends to decrease and rubberized concrete with 0.45 w/b ratio recorded comparable density and strength to that normal concrete. The use of a lower water-binder ratio in concrete mix improved the strength of rubberized fly ash concrete equivalent to the normal concrete, allowing for usage of green materials in real building construction.

Prediction of the dynamic properties in rubberized concrete

Throughout the previous years, many efforts focused on incorporating non-biodegradable wastes as a partial replacement and sustainable alternative for natural aggregates in cement-based materials. Currently, rubberized concrete is considered one of the most important green concrete materials produced by replacing natural aggregates with rubber particles from old tires in a concrete mixture. The main benefits of this material, in addition to its importance in sustainability and waste management, comes from the ability of rubber to considerably damp vibrations, which, when used in reinforced concrete structures, can significantly enhance its energy dissipation and vibration behavior. Nowadays, the literature has many experimental findings that provide an interesting view of rubberized concrete's dynamic behavior. On the other hand, it still lacks research that collects, interprets, and numerically investigates these findings to provide some correlations and construct reliable prediction models for rubberized concrete's dynamic properties. Therefore, this study is intended to propose prediction approaches for the dynamic properties of rubberized concrete. As a part of the study, multiple linear regression and artificial neural networks will be used to create prediction models for dynamic modulus of elasticity, damping ratio, and natural frequency.

Experimental Study on the Strengthening Properties of Rubber Concrete with Hook End Steel Fibers

The fast development of automobile sector, removal of discarded waste elastic is turning into a broad ecological problem. In the current work, exertion has been made to limit this problem By using scrap elastic as the scrap (morsel) concrete rubber in various percentages, as a partial replacement for the fine aggregates. In this paper, the mechanical properties of rubberized concrete with steel fibre (RSFC) are studied experimentally. This article discussed the effect by volume of concrete (5, 7.5 and 10 per cent rubber) and (0.8.0.1 and 1.2 per cent steel fibre) on the reinforcement of the properties of rubberized concrete with steel fibres (RSFC) of scrap crumb rubber (SCR) and steel fibre (SF) with different steel substances. The literature survey suggests that there is a substantial decline in strengths of the single morsel rubber used in traditional concrete. like compressive, tensile and flexural strength therefore to overcome this problem by using steel fibers in present investigation and from the results it can be finalized that the all the strengthening properties (compressive, tensile strength and flexural strength) are increased contrasted with rubberized concrete but still test values are inferior than conventional concrete due to fineness of crumb rubber and irregular shape of hook end steel fiber.

Research on the properties of rubber concrete containing surface-modified rubber powders

The use of rubber powders in rubber concrete mixtures are gaining importance. In this study, the effect of the modified rubbers on the surface characteristics of rubber concrete is investigated, together with their engineering practicability by different rubber modification methods. The surface changes of rubber modified by sodium hydroxide, sulfonation, and urea were studied by contact angle and infrared spectroscopy. The basic mechanical properties and impact resistance of modified rubber concrete were studied and related by Scanning Electron Microscope image analysis. The results show that the selected rubber modification can improve the interaction between cement paste and rubber and improve the adhesion between them. Compared with ordinary rubber concrete, the compressive strength of rubber concrete treated with sodium hydroxide was only slightly improved, but its flexural strength, tensile splitting strength, and impact resistance were greatly improved. After the rubber was modified by urea or sulfonation, a variety of polar groups were introduced on the rubber surface. That led to an increase in the mutual attraction between rubber particles and cement paste, and improved the compressive strength, the tensile splitting strength, the flexural strength, and the impact resistance of rubber concrete. Furthermore, the strength loss of rubber concrete was greatly reduced. Rubber modification improves the performance of rubber concrete, showing good application potential.

Statistical modeling of rubberized concrete beams confined by FRP using RSM technique

The use of rubber in concrete has been practiced in the engineering community for several years. However, the poor mechanical properties of rubberized concrete are a serious hurdle. This innovative research provides a closer look at improving the flexural strength of rubberized concrete beams with high rubber content using confinement technique. FRP jackets with different confinement thickness were used to recover the strength loss of rubberized concrete beams. In this paper, 66 rubberized concrete (RuC) beams having 0–50% rubber content were tested under four-point loading. RuC beams suffered up to 167% reduction in flexural strength. However, the FRP jackets were highly effective to improve the flexural strength of RuC beams. The statistical models were developed to predict the flexural strength of FRP confined rubberized concrete beams using response surface methodology (RSM). In this regard, the effect of two principle variables; unconfined strength and number of FRP layers on the flexural strength of FRP confined rubberized concrete beams was investigated. The models were found significant because the predicted and adjusted R2 was less than 0.2 (a limit proposed by Design Expert software). The predicted and experimental results for FRP confined rubberized concrete beams were found in good agreement. The developed statistical models provide insights into the sensitivity of parameters affecting the flexural strength. The proposed models can improve the reliability of the experiments and reduces the design and analysis time.

Effects of Rubber Particles on Rheological and Mechanical Properties of Concrete Containing CaCO3 Nanoparticles

Lots of waste rubber is being produced in the world and the utilization of it not only mitigate environmental impacts caused by waste rubber disposal but also enhance sustainable development. As a result, rubberized concrete, by incorporation of waste rubber into concrete, should be considered as one of the effective strategies to take advantage of waste rubber. However, problems such as low strengths, weak adhesion between rubber particles and cement pastes, and undesirable pore structures associated with rubberized concrete should be pay more attention to. In this study, the effect of replacement fine aggregate with rubber particles on rheological and mechanical properties of concrete containing CaCO3 nanoparticles was examined through slump, compressive and flexural strength tests. Rubber particles were employed to replace the fine aggregate equally by volume while CaCO3 nanoparticles were used as an equal part of binder by weight. Different sizes and volume contents of rubber particles were evaluated as well as different weight contents of CaCO3 nanoparticles. In addition, corresponding tests were also performed to evaluate the effect of CaCO3 nanoparticles in comparison to concrete specimens without CaCO3 nanoparticles. The results showed that replacement fine aggregates with rubber particles had some influence on the mechanical properties of rubberized concrete, resulting in undesirable findings in terms of compressive and flexural strengths. However, the incorporation of CaCO3 nanoparticles improved mechanical properties of rubberized concrete. Regarding slump test, the rubberized concrete without CaCO3 nanoparticles showed better performance. Considering rheological and mechanical properties, rubberized concrete with 1% CaCO3 nanoparticles presented acceptable results.

Ponašanje pri zamoru uslijed savijanja i mehanička svojstva betona s dodatkom gumenog granulata

Ponašanje pri zamoru uslijed savijanja i mehanička svojstva betona s dodatkom gumenog granulata

Experimental and Numerical Study on the Behavior of Rubberized Concrete

Abstract In this study, the properties of rubberized concrete were examined and finite-element (FE) models were developed to investigate the accuracy of a current concrete material model in predicting the compressive behavior of rubberized concrete. The rubber particles, with a size of 1.18 mm were used at 0 %, 6 %, 12 %, and 18 % volume replacement of fine aggregate, keeping the proportions of gravel, water, and cement the same in all mixtures. Cylindrical and beam specimens were prepared and tested to evaluate the effect of rubber content on the density, compressive strength, elastic modulus, and damping ratio of the concrete. The results indicated that the damping ratio of rubberized concrete increased by 5.5 %, 27.8 %, and 64.8 % with rubber replacement of 6 %, 12 %, and 18 %, respectively. In addition to the experimental study, non-linear finite-element analysis was carried out using LS-DYNA software (Livermore Software Technology Corporation). The FE model developed in this paper was able to closely simulate the compressive behavior of the rubberized concrete specimens. The stiffness, compressive strength, volumetric response, and the dilation behavior obtained using the FE analysis agreed well with the values measured in the experimental work. The results show that the current concrete material model can be considered for rubberized concrete, provided that the compressive strength is modified to account for the reduction in strength caused by the added rubber.

Experimental investigation on durability performance of rubberized concrete

The study presented herein aims to investigate the durability related properties of rubberized concrete. Two types of waste scrap tire rubber were used as fine and coarse aggregate, respectively. The rubber was replaced with aggregate by three crumb rubber and tire chips levels of 5, 15, and 25% for the rubberized concrete productions. In order to improve the transport properties and corrosion resistance of rubberized concretes, SF was replaced with cement at 10% replacement level by weight of total binder content. The transport properties of the rubberized concretes were investigated through water absorption, gas permeability, and water permeability tests. The corrosion behavior of reinforcing bars embedded in plain and silica fume based rubberized concretes was investigated by linear polarization resistance (LPR) test. The results indicated that the utilization of SF in the rubberized concrete production enhanced the corrosion behavior and decreased corrosion current density values. Moreover, the reduction in the water and gas permeability coefficients was observed by the incorporation of SF in plain and especially rubberized concretes.

Road Performance of Silane Coupling Agent Modified Rubber Concrete

Silane coupling agent can be built a "molecular bridge" between organic molecules and inorganic molecules on the rubber surface modification, the binding ability of rubber particles and cement based materials has increased, thus improving the mechanical properties of rubber concrete. Study on silane coupling agent dosage as cementations material quality of 0.5%, the modification effect of coupling agent on the rubber concrete, compared with changes in mechanical properties of unmodified rubber concrete, and analysis the test concrete fracture pressure ratio, using the ultrasonic detector to measure ultrasonic velocity in concrete, to calculate the dynamic modulus and study its road noise performance.

Experimental Study on Comparison about the Modifiers of Rubber Cement Concrete

5-8 mesh rubber granules was mixed with an equal volume instead of fine aggregate, and the content of rubber was 5%, 10%, 15% and 20%. Compared with the influence of silane coupling agent, latex and silica fume to the mechanical properties of rubber concrete, it studied the mechanism of rubber-modified to the rubber concrete. The test results proved that the silane coupling agent, latex, and silica fume could improve the compressive strength, splitting and flexural strength. Latex could significantly improve the bond strength of cement-based materials and the integrity of the concrete. Coupling agent made rubber bond with cement-based materials to form a stable connection, and silica fume filled the pore in concrete, so it optimized the gradation. Latex was the best, silane coupling agents was second, and silica fume was the last about the improved effect of three kinds of modifiers.

Effect of rubber particle modification on properties of rubberized concrete

To improve the combination of cement matrix and waste tire rubber particles in concrete, the rubber particles were treated with acrylic acid (ACA) and polyethylene glycol (PEG) for grafting hydrophilic groups on their surfaces. The X-Ray photoelectron spectroscopy (XPS) and surface contact angle were used to characterize the hydrophilicity and surface functional group of rubber particles. The effect of rubber particle modification on fresh/hardened properties of rubberized concrete was studied. The experimental results show that the contact angle between rubber particle surface and water decreases when rubber particle is modified. Compared with the unmodified rubberized concrete(RC), the unit weight of modified rubberized concrete(MRC) changes slightly. However, the slump, air-entrainment, compressive strength, flexural strength, and impact performance of MRC are obviously improved. Under good condition of slump, the water-cement ratio of the MRC can be reduced from 0.4 to 0.38. And the compressive strength and flexural strength of the MRC(10% rubber particle content) can be increased by 25.9% and 26.4%, respectively.

Proportion of Tensile Strength and Compressive Strength of the Crumb Rubber Concrete Modified by Silane Coupling Agent

Silane coupling agent built a "molecular bridge" between organic molecules and inorganic molecules, which modified the rubber surface and increased the adhesive ability of rubber particles and cement, so that improved the mechanical properties of rubber concrete. This paper studied on the modification effect of coupling agent on the rubber concrete while the quality of silane coupling agent was 0.5% of that of cementitious material which compared with the mechanical properties of unmodified rubber concrete and the test of concrete under tension and compression ratio and compression ratio were analyzed at the same time.

Experimental Study on the Mechanical Properties of the Crumb Rubber Concrete Modified by Latex

Through modification of the rubber surface, the adhesive ability of rubber particles and cement based materials has increased, thus improving the mechanical properties of rubber concrete. Dosage of styrene butadiene latex was studied under the condition of 5% cement quality, the change regularity of different amount of rubber latex rubber modified concrete compressive, splitting, flexural strength and other mechanical properties. The test results prove that the latex rubber mixing can improve compressive, splitting and flexural strength of concrete.

Hydro-abrasive resistance and mechanical properties of rubberized concrete

Hydro-abrasive resistance and mechanical properties of rubberized concrete

Experimental Research on Properties of Fresh and Hardened Rubberized Concrete

In this study, the use of tire-rubber particles as a replacement for coarse aggregate in concrete is investigated. Rubber has replaced coarse aggregate at content levels of 25, 50, 75, and 100% in concrete by volume. Also, emulsified asphalt (EA) was used to improve the mechanical properties of rubberized concrete. Four different series of concrete mixtures were designed to investigate the effects of the water-cement (w/c) and EA-cement (EA/C) ratios on the properties of rubberized concrete. The slump, air content, dry unit weight, compressive strength, elasticity modulus, and flexural strength have been compared to the corresponding properties of controlled concrete. Consequently, an increase in rubber content leads to a decrease in slump and an increase in air content because of the rough surface of rubber. An increase in rubber content decreases compressive strength, elasticity modulus, and flexural strength because of its lower stiffness and poorer bonding between rubber and the paste matrix. In the case of equal levels of rubber particle content, the addition of EA greatly increases slump. However, the effects of EA on the properties of rubberized concrete, such as air content, strength, and elasticity modulus, are based on the EA/C ratio. A certain level of EA addition can improve the compressive and flexural strength of rubberized concrete. EA addition reduces the elasticity modulus of the concrete. Adding EA is a good way to improve the bonding between rubber particles and cement paste.

Properties of Cement Composite Containing Waste Tire Rubber, Silica Fume and Polypropylene Fiber

Management of solid wastes is one of the most important issues around the world. Vehicle tires are one of these solid wastes. A test program was carried out to determine the mechanical properties of rubberized concretes with and without silica fume and polypropylene fiber. The main objective of this study was to investigate the use of silica fume in cement composite containing waste rubber tire. In the present work the Silica fume was replaced by 10% of cement weight. Five designated rubber content varying from 10% to 50% by volume and polypropylene content 0.3% by volume were used. The 28-days properties of the cement composite were determined. The analyses included compressive strength, flexural strengths, velocity of ultrasonic wave, water absorption and Scaning electron microscopy(SEM). The results indicated the following points: Increase in rubber content decreases the sample unit weight, the introduction of rubber particles significantly increas the strain capacity of the materials and the use of silica fume increas the mechanical properties.