Establishing Relationship Between Modulus of Elasticity and Strength of Nano Silica Modified Roller Compacted Rubbercrete

Mohammed, Bashar S.

doi:10.21660/2017.39.23401

Cited by 8 publications

(3 citation statements)

References 23 publications

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“…Figure 12 presented the results of the average modulus of elasticity (MoE) of the concrete. As it has already been established that the MoE is directly proportional and dependent on the compressive strength of concrete [1,[56][57][58]. Substitution of up to 15% cement using CCR enhanced the MoE of the concrete without any NS addition.…”

Section: Modulus Of Elasticitymentioning

confidence: 92%

Mechanical Properties and Durability Performance of Concrete Containing Calcium Carbide Residue and Nano Silica

et al. 2021

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Calcium carbide residue (CCR) is the end-product of production of acetylene gas for the applications such as welding, lighting, ripening of fruits, and cutting of metals. Due to its high pH value, disposing of CCR as a landfill increases the alkalinity of the environment. Therefore, due to its high calcium content, CCR is mostly blended with other pozzolanic materials, together with activators as binders in the cement matrix. In this study, cement was partially substituted using CCR at 0%, 7.5%, 15%, 22.5% and 30% by weight replacement, and nano silica (NS) was utilized as an additive by weight of binder materials at 0%, 1%, 2%, 3% and 4%. The properties considered were the slump, the compressive strength, the flexural strength, the splitting tensile strength, the modulus of elasticity, and the water absorption capacity. The microstructural properties of the concrete were also examined through FESEM and XRD analysis. The results showed that both CCR and NS increase the concrete’s water demand, hence reducing its workability. Mixes containing up to 15% CCR only showed improved mechanical properties. The combination of CCR and NS significantly improved the mechanical properties and decreased the concrete’s water absorption through improved pozzolanic reactivity as verified by the FESEM and XRD results. Furthermore, the microstructure of the concrete was explored, and the pores were refined by the pozzolanic reaction products. The optimum mix combination was obtained by replacing 15% cement using CCR and the addition of 2% NS by weight of cementitious materials. Therefore, using a hybrid of CCR and NS in concrete will result in reduction of cement utilization in concrete, leading to improved environmental sustainability and economy.

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Section: Modulus Of Elasticitymentioning

confidence: 92%

Mechanical Properties and Durability Performance of Concrete Containing Calcium Carbide Residue and Nano Silica

et al. 2021

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“…This increase is due to the ability of NS to react with Ca(OH)2 from cement hydration to produce more calcium-silicate-hydrate which increases strength and consequently MOE. It is also due to the pore filling ability of NS, making the RCR denser, with microstructure and densified ITZ between CRcement paste and aggregate-cement paste [25,26]. …”

Section: Effect Of Crumb Rubber and Nano Silica On The Static Modulusmentioning

confidence: 99%

Evaluating the Static and Dynamic Modulus of Elasticity of Roller Compacted Rubbercrete Using Response Surface Methodology

Mohammed

Adamu

2018

GEOMATE

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ABSTRACT:In this study, response surface methodology (RSM) was used to evaluate the effect of partial replacement of fine aggregate with crumb rubber (CR), and the addition of nano silica (NS) by weight of cement in roller compacted concrete (RCC) pavement. Roller compacted rubbercrete (RCR) is used as the terminology for RCC where fine aggregate is partially replaced with crumb rubber. The experiments were designed and analysis executed using the historical data model type. After executing the experimental works, regression analysis was used to develop models for predicting the static and dynamic modulus of elasticity (MOE) of RCR. The RSM regression analysis showed that both static and dynamic MOE decreases with increase in CR replacement level, and increases with increment in addition of NS up to 2%. Therefore CR increases the flexibility of RCR while NS increases its stiffness. The analysis of variance for the developed models showed that the static MOE of RCR can be predicted using cubic model type while the dynamic MOE can be predicted using quadratic model type, with all the models having high degree of correlation and was in agreement with the experimental data.

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“…Mix proportioning has been carried out according to the geotechnical approach to the requirements of ACI 211.3R-02 [17,18]. This involves the determination of aggregate proportion for recommended combined aggregate gradation curve.…”

Section: Design and Proportioningmentioning

confidence: 99%

Effect of Crumb Rubber and Nano Silica on the Creep and Drying Shrinkage of Roller Compacted Concrete Pavement

Adamu¹

2018

GEOMATE

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ABSTRACT:Roller compacted concrete (RCC) pavement is used mostly for heavy duty vehicle operations such as log sorting yards, intermodal yards for containers, parking areas for military vehicles and trucks and automobiles, and aircraft parking ramps. Therefore, it is subjected to long-term loading which can cause permanent deformation. Therefore in this study, the long-term creep and drying shrinkage of RCC pavement up to 1 year was studied. High volume fly ash (HVFA) RCC pavement was developed by replacing 50% cement with fly ash. A total of five RCC pavements were developed; one control mixture, two RCC pavement mixtures and two HVFA RCC pavement mixtures. The four mixtures were developed by replacing 10% fine aggregate with crumb rubber by volume and addition of 1% nano silica by weight of cementitious materials. The results showed that the creep and drying shrinkage of RCC pavement increases with time, and with the incorporation of crumb rubber and HVFA and decreases with the addition of nano-silica. The creep strain of RCC pavement mixtures can be predicted at any given time using their compressive strength and age of testing.

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Establishing Relationship Between Modulus of Elasticity and Strength of Nano Silica Modified Roller Compacted Rubbercrete

Cited by 8 publications

References 23 publications

Mechanical Properties and Durability Performance of Concrete Containing Calcium Carbide Residue and Nano Silica

Mechanical Properties and Durability Performance of Concrete Containing Calcium Carbide Residue and Nano Silica

Evaluating the Static and Dynamic Modulus of Elasticity of Roller Compacted Rubbercrete Using Response Surface Methodology

Effect of Crumb Rubber and Nano Silica on the Creep and Drying Shrinkage of Roller Compacted Concrete Pavement

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