Effect of fly ash and grading agent on the properties of mortar using response surface methodology

Mtarfi, N.H.; Raïs, Z.; Taleb, M.; Kada, K.

doi:10.1016/j.jobe.2016.12.004

Cited by 35 publications

(13 citation statements)

References 24 publications

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“…Using a p-value of 0.05, variance analysis was employed to calculate the significance level of the variables. The key and interactive terms of the variables with p-values lower than 0.05 were regarded as significant in affecting the model responses, whereas p-values greater than 0.05 were regarded insignificant [33,34]. For prediction models, only significant terms are dealt with except those needed to sustain the order of the model.…”

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confidence: 99%

Effect of Elevated Temperature on the Compressive Strength and Durability Properties of Crumb Rubber Engineered Cementitious Composite

et al. 2020

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This paper reports the findings of the effect of elevated temperature on the compressive strength and durability properties of crumb rubber engineered cementitious composite (CR-ECC). The CR-ECC has been tested for its compressive strength and chemical resistance test against acid and sulphate attack. Different proportions of crumb rubber (CR) in partial replacement to the fine aggregate and polyvinyl alcohol (PVA) fiber have been utilized from 0 to 5% and 0 to 2%. The experiments were designed based on a central composite design (CCD) technique of response surface methodology (RSM). After 28 days curing, the samples were preconditioned and exposed to high temperatures of 100 °C, 200 °C, 300 °C, 400 °C, 500 °C, 600 °C, 700 °C, 800 °C, 900 °C, and 1000 °C for one hour. Although the residual compressive strength of CR-ECC was negatively affected by elevated temperature, no explosive spalling was noticed for all mixes, even at 1000 °C. Results indicated that CR-ECC experiences slight weight gain and a reduction in strength when exposed to the acidic environment. Due to the reduced permeability, CR-ECC experienced less effect when in sulphate environment. The response models were generated and validated by analysis of variance (ANOVA). The difference between adjusted R-squared and predicted R-squared values for each model was less than 0.2, and they possess at least a 95% level of confidence.

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confidence: 99%

Effect of Elevated Temperature on the Compressive Strength and Durability Properties of Crumb Rubber Engineered Cementitious Composite

et al. 2020

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“…Although the optimum values can be found, it is difficult to identify the optimum regions intuitively. Actually, a conventional methodology of one factor at a time (OFAT), which means a single factor for a specific experimental design with other factors maintained constant, has been blamed for failing to provide expected output as the interaction effects among variables are not correctly examined [21]. On the contrary, RSA as an optimization method is created to undertake the central composite design (CCD).…”

Section: Methodsmentioning

confidence: 99%

“…Theoretically, it is a key statistical method for solving multivariate problems. RSM is widely used in research to identify the optimum solution by analyzing variables which affect final results [21,22,23,24,25,26].…”

Section: Methodsmentioning

confidence: 99%

Sulfur Dioxide Degradation by Composite Photocatalysts Prepared by Recycled Fine Aggregates and Nanoscale Titanium Dioxide

Chen

Kou

2019

Nanomaterials

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To alleviate the heavy burden on landfilling, construction and demolition wastes (C&DWs) are recycled and reused as aggregates in cementitious materials. However, the inherent characteristics of recycled fine aggregates (RFA), such as the high crushing index and high-water absorption, magnify the reusing difficulty. Nevertheless, attributing to the high porosity and high level of calcium hydroxides existing in the old mortar, RFA is featured with a high specific surface area and a high alkalinity. These features are useful to augment the total photo-degradation of SO2 by nano-TiO2 (NT) intermixed mortar, leading RFA to be an excellent potential carrier to load nano-TiO2 and prepare the composite photocatalyst. Hence, this study proposed to load NT onto the surface of RFAs and river sands (RSs) (the control) by the soaking method, preparing composite photocatalysts denoted as NT@RFA and NT@RS, respectively. The prepared composite photocatalysts were then utilized as sands in photocatalytic mortar to evaluate for SO2 degradation. Experiments identified a 50% higher amount of NT was loaded onto the surface of FRA relative to the control. This higher loading amount plus higher alkalinity ultimately translated into a higher photocatalytic activity. In addition, the mortar containing NT@RFA exhibited 46.3% higher physiochemical absorption and 23.9% higher photocatalytic activity than that containing NT@RS. In addition, the durability, embodied by the reuse and anti-abrasive properties, of NT@RFA exceeded that of NT@RS. The overall findings reveal that the NT@RFA not only garners beneficial effect from the high porosity but also generates positive effect from the high alkalinity. Though a number of studies deal with building materials with NT, this study is the first to load NT onto RFA and prepare composite photocatalysts which were then used as fine aggregates in building materials. Consequently, this study proves the potential high-added-value reusability of RFA in green construction materials and provides a low-cost, high-efficiency approach to degrade atmospheric SO2.

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“…Mohammed, et al [11], has utilized RSM to model the compressive strength of concrete containing paper mill as additives. Mtarfi, et al [12], have optimized and developed model for predicting mortar compressive strength with RSM. Güneyisi, et al [13] have developed models and optimized high-performance concrete by minimizing the durability factors and maximizing compressive strength using metakoalin and fly ash as variables.…”

Section: Introductionmentioning

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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Effect of fly ash and grading agent on the properties of mortar using response surface methodology

Cited by 35 publications

References 24 publications

Effect of Elevated Temperature on the Compressive Strength and Durability Properties of Crumb Rubber Engineered Cementitious Composite

Effect of Elevated Temperature on the Compressive Strength and Durability Properties of Crumb Rubber Engineered Cementitious Composite

Sulfur Dioxide Degradation by Composite Photocatalysts Prepared by Recycled Fine Aggregates and Nanoscale Titanium Dioxide

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

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