The effect of specimen geometry on the compressive and tensile strengths of self-compacting rubberised concrete containing waste rubber granules

Valizadeh, Afsaneh; Hamidi, Fatemeh; Aslani, Farhad; Shaikh, Faiz Uddin Ahmed

doi:10.1016/j.istruc.2020.07.069

Cited by 28 publications

(11 citation statements)

References 53 publications

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“…In general, no more than 20% CR could lead to an increase in peak tensile strength. This is contrary to some of the existing research findings [31,51]. The reason may be that the hydration behaviour of the slag-fly ash alkali-activated binder material used differs from that of conventional concrete.…”

Section: Tensile Strength and Toughnesscontrasting

confidence: 83%

Ultra-High-Performance Alkali-Activated Concrete: Effect of Waste Crumb Rubber Aggregate Proportions on Tensile and Flexural Properties

Li,

Chen,

Che

et al. 2024

Buildings

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The declining availability of natural sand resources and the significant carbon footprint associated with the extensive use of cement are posing severe limitations on the advancement and application of ultra-high-performance concrete (UHPC). In this study, waste tyre-derived recycled crumb rubber particles (CR) were employed to replace quartz sand, and an alkali-activated cementitious material was used to produce waste tyre-alkali-activated UHPC (T-UHPAC). The influence of different CR replacement ratios (0%, 5%, 20%, 35%, 50%) on the tensile and flexural performance of T-UHPAC was investigated, and a predictive model for the stress–strain response considering the CR replacement ratio was established. An optimization method for improving the tensile and flexural performance of T-UHPAC was proposed. The results indicate that the effect of rough-surfaced CR on the interfacial properties of concrete differs from that of smooth quartz sand. A CR replacement ratio exceeding 35% led to a reduction in both the tensile and flexural strengths of UHPAC, while a replacement ratio at or below 20% resulted in a superior tensile and flexural performance of T-UHPAC. The established predictive model for tensile performance accurately forecasts the stress–strain behaviour of T-UHPAC under varying CR replacement ratios, with the accuracy improving as the CR replacement ratio increases. By utilizing CR to replace quartz sand in proportions not exceeding 20%, the production of low-carbon UHPC with exceptional comprehensive mechanical properties is achievable. Moreover, the development of T-UHPAC through the comprehensive utilization of waste tyres presents a promising and innovative approach for the low-carbon and cost-effective production of UHPC, thereby facilitating the sustainable development of natural resources. This research represents a significant step towards the widespread adoption and application of UHPC and thus holds substantial importance.

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Section: Tensile Strength and Toughnesscontrasting

confidence: 83%

Ultra-High-Performance Alkali-Activated Concrete: Effect of Waste Crumb Rubber Aggregate Proportions on Tensile and Flexural Properties

Li,

Chen,

Che

et al. 2024

Buildings

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“…It can be observed that after model reduction, the predicted and adjusted R 2 values for both the weight reduction (H 2 SO 4 ), and water absorption were now following one another as their differences were below 0.2. The developed mathematical models after the non-significant terms were removed for the weight reduction (H 2 SO 4 ) and water absorption models are presented as Equations ( 7) and (8), respectively. The backward elimination for the models reduction was selected algorithmically by the RSM software using, multiple model selection methods and criteria.…”

Section: Durability Performance Against Acid and Salt Attackmentioning

confidence: 99%

“…The backward elimination for the models reduction was selected algorithmically by the RSM software using, multiple model selection methods and criteria. The best one-term-smaller model (insignificant term) for the selected criteria was kept in order to improve the criterion score as in Equation (8) where the model insignificant term B representing CCR was kept. If the best one-term does not improve the cretarion score, then the whole insignifant terms were removed as in Equation ( 7) [40].…”

Section: Durability Performance Against Acid and Salt Attackmentioning

confidence: 99%

“…However, in terms of ductility, a substantial improvement was accomplished by adding all types of waste tires. Valizadeh et al [8] investigated the influence of specimen geometry on the tensile strengths and compressive strength of self-compacting rubberized concrete with CR granules. Their findings showed that the variations between the cubes and cylindrical specimens were higher for the selfcompacting rubberized concrete containing 20% CR in comparison to the mixes with lower CR content.…”

Section: Introductionmentioning

confidence: 99%

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Modelling and Optimizing the Durability Performance of Self Consolidating Concrete Incorporating Crumb Rubber and Calcium Carbide Residue Using Response Surface Methodology

et al. 2022

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The world is now focusing on a sustainable environment and reducing the effects of global warming. One way to achieve such targets is to properly utilize waste and reduce greenhouse CO2 emissions. The cement industry is responsible for almost 10% of global CO2 emission due to the high demand for cement in the construction industry. One of the ways to minimize this effect is the partial replacement of cement by other materials in concrete. Therefore, in this study, calcium carbide residue (CCR), which is highly rich in calcium oxide, partially replaced cement for waste management. Waste tires were grinded to fine sizes in crumb rubber (CR) and partially replaced the fine aggregate. Therefore, this paper investigared the influence of CR and CCR on the durability properties and heat/temperature resistance of self-compacting concrete (SCC). The experiment was designed using response surface methodology to investigate the effects of CR and CCR on SCC properties, design models for properties of the SCC, and optimize the mixes to achieve the best results. The properties considered were the durability of acid attack resistance (H2SO4 attack), salt attack resistance (MgSO4 attack), and water absorption. The heat resistance considered was weight reduction and residual compressive strength after heating the samples at a 200 °C and 400 °C. The results findings showed that CR and CCR negatively affect the acid and salt resistance of the SCC. Furthermore, CR negatively affects the heat resistance of the SCC, while CCR slightly improved it at 200 °C. The models developed using RSM were significant with high degrees of correlation and predictability. The optimum properties achieved 2.9% CR as a fine aggregate replacement and 5.5% CCR as a cement replacement. The developed models can predict the durability performance of SCC mixes in terms of acid and salt attack resistance and the effects of elevated temperatures using CR, CCR, and fly ash as the variables. This will reduce the need for carrying out experimental work, thereby reducing cost and time.

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“…In the past few decades, the waste rubber originated from scrap tyres and rubber products had accumulated to an explicitly large amount, until this issue started threatening the environment [9][10][11]. Approximately 1000 million (M) tyres reach their useful life each year.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Silica Fume Modified High-Volume Fly Ash Rubberized Self-Compacting Concrete

et al. 2021

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The existing form of self-compacting concrete (SCC) comprises of a large amount of powdered and fine materials. In this study, a part of the cementitious material was replaced with constant high-volume fly ash, and a portion of fine aggregates was substituted by crumb rubber (CR). Besides that, silica fume (SF) was added, with the hope that by implementing a new type of nanomaterial, the loss in mechanical strength due to previous modifications such as rubberization and replacement will be prevented. Two variables were found to influence the constituent/component in the mix design: SF and CR. The proportion of SF varies from 0% to 10%, while that of CR from 0% to 30% by volume of the total river sand, where 55% of cement was replaced by the fly ash. A total of 13 rubberized SCC samples with CR and SF as controlling variables were made, and their design mix was produced by a Design of Experiment (DOE) under the Response Surface Methodology (RSM). The results reveal a slight increase in the mechanical properties with the addition of SF. The theoretical mathematical models and equation for each different mechanical strength were also developed after incorporating the experimental results into the software.

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The effect of specimen geometry on the compressive and tensile strengths of self-compacting rubberised concrete containing waste rubber granules

Cited by 28 publications

References 53 publications

Ultra-High-Performance Alkali-Activated Concrete: Effect of Waste Crumb Rubber Aggregate Proportions on Tensile and Flexural Properties

Ultra-High-Performance Alkali-Activated Concrete: Effect of Waste Crumb Rubber Aggregate Proportions on Tensile and Flexural Properties

Modelling and Optimizing the Durability Performance of Self Consolidating Concrete Incorporating Crumb Rubber and Calcium Carbide Residue Using Response Surface Methodology

Mechanical Properties of Silica Fume Modified High-Volume Fly Ash Rubberized Self-Compacting Concrete

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