Investigation on Properties of ECC Incorporating Crumb Rubber of Different Sizes

Zhang, Zhigang; Ma, Hui; Qian, Shunzhi

doi:10.3151/jact.13.241

Cited by 102 publications

(43 citation statements)

References 27 publications

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“…Essential factors that contribute to the degradation of the elastic modulus in rubberized ECC include higher void content in the cement paste, weak bonding between cement paste and crumb rubber particles, and thicker and weaker interfacial transition zone (ITZ) due to air entrapped by crumb rubber, which significantly influences the stress–strain behavior [ 15 ]. A study by Zhang et al [ 16 ] discovered that the drying shrinkage of ECC containing crumb rubber particles increased from 1050 × 10 −6 to 1660 × 10 −6 at the 90th day. In addition, the lower strength and elastic modulus and the higher water to cement ratio contribute to the lower susceptibility to drying of rubberized ECC [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Deformation Properties of Rubberized ECC Incorporating Nano Graphene Using Response Surface Methodology

et al. 2020

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Engineered cementitious composite (ECC) was discovered as a new substitute of conventional concrete as it provides better results in terms of tensile strain, reaching beyond 3%. From then, more studies were done to partially replace crumb rubber with sand to achieve a more sustainable and eco-friendlier composite from the original ECC. However, the elastic modulus of ECC was noticeably degraded. This could bring potential unseen dangerous consequences as the fatigue might happen at any time without any sign. The replacement of crumb rubber was then found to not only bring a more sustainable and eco-friendlier result but also increase the ductility and the durability of the composite, with lighter specific gravity compared to conventional concrete. This study investigated the effects of crumb rubber (CR) and graphene oxide (GO) toward the deformable properties of rubberized ECC, including the compressive strength, elastic modulus, Poisson’s ratio, and drying shrinkage. Central composite design (CCD) was utilized to provide 13 reasonable trial mixtures with the ranging level of CR replacement from 0–30% and that of GO from 0.01–0.08%. The results show that GO increased the strength of the developed GO-RECC. It was also found that the addition of CR and GO to ECC brought a notable improvement in mechanical and deformable properties. The predicted model that was developed using response surface methodology (RSM) shows that the variables (compression strength, elastic modulus, Poisson’s ratio, and drying shrinkage) rely on the independent (CR and GO) variables and are highly correlated.

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Section: Introductionmentioning

confidence: 99%

Deformation Properties of Rubberized ECC Incorporating Nano Graphene Using Response Surface Methodology

et al. 2020

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“…One possible justification is that the relative density of sand in this study was doubled at 2.65 in contrast with the relative density of crumb rubber at 1.22. Zheng et al [23] supported this reason and argued that the lower specific gravity of crumb rubber can be attributed to this reduction with various outcomes based on the practical size of rubber. Also, Richardson et al [24] reported that 1.5% of fine aggregate replacement by crumb rubber weight lead to increasing in the air content by 26%, consequently decreasing the density by 2%.In contrast, the hybrid cubical and cylindrical structure showed an increase in the overall unit density than the rubberized concrete.…”

Section: Flexure Test Setup Instrumentation and Loading Proceduresmentioning

confidence: 96%

“…Ahmed [14] and Zheng [23] used this expression to predict the modulus of elasticity based on the cube's density (Kg/m³) and compressive cylinder strength (MPa) values, which were obtained based on their experiment. According to Table 2, there are strong relationships between the compressive strength and the modulus of elasticity in reductions that are subject to crumb rubber contents.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

A Comparative Study on the Flexural Behaviour of Rubberized and Hybrid Rubberized Reinforced Concrete Beams

2019

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This paper aims to investigate the flexural behaviour of the rubberized and hybrid rubberized reinforced concrete beams. A total of fourteen beams, 150×200 mm in cross-section with 1000 mm in length, were subject to a laboratory test over an effective span of 900 mm. The sand river aggregate was replaced by 10%, 12.5%, and 15% of crumb rubber (volume). The hybrid structure contained two double layers: 1) rubberized reinforcement concrete at the top layer of the beam and 2) reinforcement concrete at the bottom layer of the concrete beam. The static responses by the flexural test of all the beams were evaluated in terms of their fresh properties, failure patterns, total energy, flexural strength, stiffness, and ultimate deflection, modulus of rupture, strain capacity, and ductility index. The results showed that there were improvements when the hybrid beams were used in most cases such as failure pattern, ultimate load, stiffness, modulus of rupture, and stress. The rubberized concrete beams showed improvements in the strain capacity as illustrated in strain gauges and stress-strain curves, toughness, ultimate deflection, and ductility index. The findings of the study revealed an improved performance with the use of the hybrid beams. This has resulted in the implementation of innovative civil engineering applications in the engineering sustainable structures.

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“…Hence, recycled aggregate concrete (RAC) containing some recycling materials, such as plastic materials [2,3], construction and demolition (C&D) wastes [4,5], and waste tire rubber [6], has been a hot research area. Given the rapid growth of tire rubber waste and its harmful effect on the environment, using rubber as a substitute in concrete not only contributes to economic growth but also benefits the environment [7]. Considering its ductility and strain behavior, rubber is normally utilized as fine aggregates (FAs) and coarse aggregates (CAs) in concrete, and therefore, the new cementitious composites, namely, rubberized concrete (RC), can be applied in civil engineering.…”

Section: Introductionmentioning

confidence: 99%

Prediction of the Strength of Rubberized Concrete by an Evolved Random Forest Model

Sun

Zhang

et al. 2019

Advances in Civil Engineering

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Rubberized concrete (RC) has attracted more attention these years as it is an economical and environmental-friendly construction material. Normally, the uniaxial compressive strength (UCS) of RC needs to be evaluated before application. In this study, an evolutionary random forest model (BRF) combining random forest (RF) and beetle antennae search (BAS) algorithms was proposed, which can be used for establishing the relationship between UCS of RC and its key variables. A total number of 138 cases were collected from the literature to develop and validate the BRF model. The results showed that the BAS can tune the RF effectively, and therefore, the hyperparameters of RF were obtained. The proposed BRF model can accurately predict the UCS of RC with a high correlation coefficient (0.96). Furthermore, the variable importance was determined, and the results showed that the age of RC is the most significant variable, followed by water-cement ratio, fine rubber aggregate, coarse rubber aggregate, and coarse aggregate. This study provides a new method to access the strength of RC and can efficiently guide the design of RC in practice.

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Investigation on Properties of ECC Incorporating Crumb Rubber of Different Sizes

Cited by 102 publications

References 27 publications

Deformation Properties of Rubberized ECC Incorporating Nano Graphene Using Response Surface Methodology

Deformation Properties of Rubberized ECC Incorporating Nano Graphene Using Response Surface Methodology

A Comparative Study on the Flexural Behaviour of Rubberized and Hybrid Rubberized Reinforced Concrete Beams

Prediction of the Strength of Rubberized Concrete by an Evolved Random Forest Model

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