Effects of spheroid and fiber-like waste-tire rubbers on interrelation of strength-to-porosity in rubberized cement and mortars

Angelin, Andressa Fernanda; Andrade, Matheus F.F.; Bonatti, Rodrigo S.; Lintz, Rosa Cristina Cecche; Barbosa, Luísa Andréia Gachet; Osório, Wislei R.

doi:10.1016/j.conbuildmat.2015.07.166

Cited by 54 publications

(29 citation statements)

References 32 publications

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“…The water absorption of BCm10 and BCg10 is almost similar to that of Cref. Many researchers have also observed that water penetration in rubber mixes is higher [24] when the replacement level is higher than 12.5% [25] or higher than15% [26]. From this test we may conclude that the percentage of water absorption decreased with smaller rubber content.…”

Section: Fig 2 Evolution Of Water Absorption Of Lightweight Concretesmentioning

confidence: 54%

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Durability Properties of Five Years Aged Lightweight Concretes Containing Rubber Aggregates

Medine¹,

Trouzine²,

Aguiar

et al. 2017

Period. Polytech. Civil Eng.

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Scrap tyres are one of the most important wastes. They can be used in different ways because of their availability and their non-degradable nature. This paper aims to demonstrate their reuse through durability properties experimental assessment of lightweight concretes aged five years, incorporating rubber aggregates as partial replacement of 5%, 7.5% and 10% of coarse/fine and coarse aggregates. The effect of the rubber aggregates on the lightweight concretes durability has been analysed. Firstly, the water absorption was evaluated, and then the mass losses were measured through many tests: freeze-thaw, elevated temperature and attack by Na2SO4 and HCl solutions. Wetting-drying cycles were carried out in order to accelerate the aging of the studied lightweight concretes and to reduce the tests duration. It has been observed that the water absorption decreased with small rubber content. The mass losses of the mixes were almost depending on rubber aggregates content and size, and the exposures duration.

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Section: Fig 2 Evolution Of Water Absorption Of Lightweight Concretesmentioning

confidence: 54%

“…From this test we may conclude that the percentage of water absorption decreased with smaller rubber content. Andressa et al [26] have showed that porosity and absorption increased with increasing rubber content [27].…”

Section: Fig 2 Evolution Of Water Absorption Of Lightweight Concretesmentioning

confidence: 99%

Durability Properties of Five Years Aged Lightweight Concretes Containing Rubber Aggregates

Medine¹,

Trouzine²,

Aguiar

et al. 2017

Period. Polytech. Civil Eng.

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show abstract

“…Concerning this issue, scholars had studied the influences of rubber size on cement-based materials, and the studies mainly focus on the workability, mechanical strengths, water absorption, resistance to sulphuric acid attack, and carbonation of cement-based materials [20,21,22,23,24]. Other studies [25,26] showed that the rubber particles in the mixture increased porosity. Some reports [27,28,29,30] revealed that the drying shrinkage of rubberized cement-based materials increased with the rubber content.…”

Section: Introductionmentioning

confidence: 99%

Influence of Rubber Size on Properties of Crumb Rubber Mortars

Zhu

2016

Materials

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Studies on the properties and applications of rubber cement-based materials are well documented. The sizes of rubbers used in these materials varied. However, information about the effects of rubber size on the properties of rubber cement-based materials, especially pore structure, mechanical strengths, and drying shrinkage properties, remains limited. Three groups of rubber with major particle sizes of 2–4 mm, 1–3 mm, and 0–2 mm were selected in this study. This paper presents experimental studies on the effects of rubber size on the consistency, fresh density, pore structure, mechanical properties, and drying shrinkage properties of crumb rubber mortars (CRMs). Results demonstrated that the consistency and fresh density of CRMs decreased with the rubber size. As to the pore structure, the total pore volume increased with the decrease of the rubber size. By contrast, the influence of the rubber size on the mesopore (<50 nm) volume is not as significant as that of the rubber content. The mechanical properties of CRMs decreased with the rubber size. Low rubber stiffness and large pore volumes, especially those of small sized rubbers, contribute to the reduction of CRMs strength. The drying shrinkage of CRM increases as the rubber size decreases. The influences of rubber size on capillary tension are not significant. Thus, the shrinkage increases with the decrease of rubber size mainly because of its function in the deformation modulus reduction of CRMs.

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“…This is reasonable and has been reported everywhere. This phenomenon occurs because the rubber particles within the microstructure of the mortar may actually act as pores due to its low elastic modulus and the poor interface between the rubber particles and the surrounding pastes (31)(32)(33). Since the bulk property of the rubber particles is out of our control, we modified the surfaces of the rubber particles to enhance the interface and improve the mechanical strength of the mortar.…”

Section: Mechanical Strength Of Mortars Containing Rubber Particlesmentioning

confidence: 99%

Performance of rubber mortars containing silica coated rubber

Chen

Cai

et al. 2021

materconstrucc

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This paper investigates the influence of silica coated rubber on the performance of rubber mortars. A classical Stöber sol-gel method is applied to produce a layer of silica coating on rubber particles, which is used to partially replace the fine aggregates in concrete. The effects of the surface-modified rubber particles on the flowability, mechanical strength, capillary water absorption rate, and microstructure of mortars are examined. The results show that the silica coating on the rubber particles reduces the contact angle between the rubber particles from 120° to 103° (i.e., by 17°) and changes the hydrophobic properties from strong hydrophobicity to weak hydrophobicity. The mechanical strengths of mortars are significantly improved by the incorporation of surface-modified rubber particles, i.e., from 41.60% to 44.86% (compressive strength) and from 7.80% to 26.28% (flexural strength). In addition, the incorporation of surface modified rubber particles increases the density of the mortar’s microstructure and enhances the interfaces with its surrounding pastes.

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Effects of spheroid and fiber-like waste-tire rubbers on interrelation of strength-to-porosity in rubberized cement and mortars

Cited by 54 publications

References 32 publications

Durability Properties of Five Years Aged Lightweight Concretes Containing Rubber Aggregates

Durability Properties of Five Years Aged Lightweight Concretes Containing Rubber Aggregates

Influence of Rubber Size on Properties of Crumb Rubber Mortars

Performance of rubber mortars containing silica coated rubber

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