Mechanical and restrained shrinkage behaviors of cement mortar incorporating waste tire rubber particles and expansive agent

Shao, Jianwen; Zhu, Han; Xue, Gang; Yu, Yong; Borito, Said Mirgan; Jiang, Wenlixia

doi:10.1016/j.conbuildmat.2021.123742

Cited by 23 publications

(8 citation statements)

References 57 publications

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“…The RSCRTM employed in this paper was initially developed by Zhu et al 34 The likelihood of the crack might happen at any segment within the assigned width (8 cm) of the CSA application zones among the four sides of the specimen. The inner steel ring of the RSCRTM is positioned in the center of a squared outer frame so that the induced crack initiation will be directed to the tip of the highest strain concentration 35–37 . The typical geometry and dimensions of the RSERTM and the RSCRTM specimens are shown in Figures 6 and 7.…”

Section: Test Methodsmentioning

confidence: 99%

“…The inner steel ring of the RSCRTM is positioned in the center of a squared outer frame so that the induced crack initiation will be directed to the tip of the highest strain concentration. [35][36][37] The typical geometry and dimensions of the RSERTM and the RSCRTM specimens are shown in Figures 6 and 7. The strain gauges were carefully positioned at the mid-height of the concrete specimen's inner steel ring (0 , 90 , and 45 ), as illustrated in Figure 8.…”

Section: Restrained Shrinkage and Cracking Potential Testmentioning

confidence: 99%

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Effect of superabsorbent polymers on mechanical strength and cracking of mortar and concrete with water to cement ratios of 0.4 and 0.5

Borito

Zhu

et al. 2022

Structural Concrete

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Most studies of adding superabsorbent polymers (SAP) into concrete focus on high-strength concrete, while this paper aims to understand the influence of SAP on "ordinary concrete" at a w/c ratio being 0.4 or 0.5. The proposed experiments include the effect of particle size, mixing methods, and dosages on the restrained shrinkage and mechanical properties of mortar and concrete. Mortar with varying dosages of SAP (0.1, 0.2, and 0.3 wt.%) and two types of SAP (type-a of 30-60 mesh and type-d of 300-400 mesh) was studied to evaluate the effect of SAP on mortar's cracking and strength. Two mixing processes of SAP (dry and pre-wetted) were used to examine the effect of SAP on the mortar's shrinkage and mechanical properties. Furthermore, concrete specimens with a w/c ratio of 0.5 were prepared to investigate the cracking performance of concrete using the restrained squared concentric ring test method, a new approach which can predict the cracks location and pattern to evaluate the restrained shrinkage of concrete. The result revealed that the addition of SAP in a prewetted state decreased the mechanical properties at early curing age. The addition of 0.3 wt.% SAP was found to have mitigated the restrained shrinkage while prolonging the time to cracking of cementitious composites. The major finding is that adding SAP to ordinary concrete reduces shrinkage and improves mechanical strength, which should be further looked into and explored in its application in engineering work.

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Section: Test Methodsmentioning

confidence: 99%

Section: Restrained Shrinkage and Cracking Potential Testmentioning

confidence: 99%

Effect of superabsorbent polymers on mechanical strength and cracking of mortar and concrete with water to cement ratios of 0.4 and 0.5

Borito

Zhu

et al. 2022

Structural Concrete

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“…RRA replacing natural sand can increase the fluidity of mortar and reduce the water demand of mortar [ 2 ]. With the increase of the volume proportion of RRA in cement-based materials, the mechanical properties of the materials will be reduced, but the toughness and durability of cement-based materials can be improved [ 3 , 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Energy Dissipation and Dynamic Fragmentation of Alkali-Activated Rubber Mortar under Multi-Factor Coupling Effect

Shi

et al. 2022

Materials

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Recycled rubber aggregate (RRA) made from ground tire rubber has been promoted for its light weight and shock resistance. The high alkalinity of alkali-activated slag mortar has a modification effect on the surface of RRA. This paper studies the performance of alkali-activated slag mortar using RRA as aggregate (RASM), which has significance for applications in low-carbon building materials. The orthogonal test analysis method was used to analyze the significance and correlation of the main variables of the test. The dynamic energy absorption capacity and crushing state of RASM under the synergistic effect of various factors were studied using the separating Hopkinson pressure bar (SHPB) test system. The energy absorption characteristics and failure modes of RASM were analyzed by SEM and microscopic pore characterization. The results show that the increase of the alkali equivalent of the mix ratio will increase the peak value of the absorption energy of the specimen. When the size of the RRA is between 0.48 mm~0.3 mm, the dynamic energy absorption of the specimen will reach its peak value. Although the increase in the total volume of RRA will reduce the energy absorption capacity of RASM specimens, its crack resistance is enhanced.

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“…Because discarded tires (solid polymers) are not easily degraded, they have caused a lot of "black pollution" to the environment. Therefore, the recycling and reuse of waste tires has become an urgent problem to be solved [5][6][7]. Crushing waste tires into rubber powder or rubber particles can replace part of the fine aggregate in concrete to provide rubber concrete [8].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Hybrid Fiber Reinforced Rubber Concrete

Yong-dong

2021

Materials

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Orthogonal experiments were designed for hybrid fiber rubber concrete (HFRC). The mechanical properties of HFRC were tested and compared with ordinary concrete. The effects of basalt fiber volume ratio (VBF), PVA fiber volume ratio (VPF) and rubber volume ratio (VR) on the compressive strength, splitting tensile strength and flexural strength of HFRC were analyzed. The results show that the strength of HFRC is the best when the volume ratio of basalt fiber is 0.3%, the volume ratio of PVA fiber is 0.2% and the volume ratio of rubber is 5%. Basalt fiber has the greatest influence on the strength of HFRC. The strength of HFRC mixed with hybrid fiber is greatly improved, which reflects the good fiber “positive hybrid effect”. With the increase of rubber volume ratio, the strength of HFRC decreases gradually. With the help of SEM and EDS, the toughening and cracking resistance mechanism of the fiber to HFRC was analyzed. Finally, the strength of HFRC was predicted by model.

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Mechanical and restrained shrinkage behaviors of cement mortar incorporating waste tire rubber particles and expansive agent

Cited by 23 publications

References 57 publications

Effect of superabsorbent polymers on mechanical strength and cracking of mortar and concrete with water to cement ratios of 0.4 and 0.5

Effect of superabsorbent polymers on mechanical strength and cracking of mortar and concrete with water to cement ratios of 0.4 and 0.5

Energy Dissipation and Dynamic Fragmentation of Alkali-Activated Rubber Mortar under Multi-Factor Coupling Effect

Mechanical Properties of Hybrid Fiber Reinforced Rubber Concrete

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