Strength Analysis and Optimization of Alkali Activated Slag Backfills Through Response Surface Methodology

Dai, Xinghang; Ren, Lei; Gu, Xiaozhong; Yilmaz, Erol; Fang, Kun; Jiang, Haiqiang

doi:10.3389/fmats.2022.844608

Cited by 12 publications

(2 citation statements)

References 74 publications

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“…One of them is to use the Response Surface Methodology (RSM), which uses the multivariate nonlinear regression method and strives to obtain optimal experimental conditions. Being one of most widely used experimental design methods; RSM uses the method of Box -Behnken to assess the link between autonomic factors and responses [19].…”

Section: Introductionmentioning

confidence: 99%

Effect of Rise in Temperature (250°C) on the Physico-Mechanical Properties of Rubber Mortars

Assia,

Messaouda,

Salima

et al. 2023

Advances in Materials Science

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The recovery and use of waste in the field of civil engineering, particularly in construction materials, is one of the most prominent solutions for preserving the environment. In order to evaluate the results obtained, it is necessary to study the evolution of the properties of these new materials in the different environments where they can live or be exposed, and why not develop an effective method of treatment of such materials for the possibility of their use even in the field of precast concrete. The objective of this work is to study the effect of the increase in temperature as a living environment or as a treatment on the physico-mechanical properties of a crumbled mortar, a potential source of many environmental and economic problems. Hence the screening and the possibility of using these new mortars with sufficient physico-mechanical properties for masonry and why not for prefabrication. The formulation of the mixtures based on the substitution of dune sand by crumb rubber, at different weight contents 10, 20 and 30%. Consequently, prismatic specimens (4x4x16) cm3 subjected to the temperature (250°C), with a speed of 2°C/min followed by a one-hour plateau at the target temperature then cooling to the ambient temperature. The results obtained show that the maximum mass loss is 5% for 30% substitution and that for 10% substitution the absorption by total immersion decreased by more than two thirds and the porosity accessible to water decreased by more than half. The compressive strength increases by 8.9% for 10% substitution and the minimum decrease in tensile strength by bending is at the same substitution of an order of 26.9%. Using the analysis of variance, the influence of the substitution of dune sand by rubber crumbs and of the rise in temperature to 250°C on the behavior of the mortar acquired. Patterns developed by response surface methodology were significant for all p-value substitutions <5%. The results of the numerical optimization showed that the best mixture could obtained by replacing 30% of dune sand with rubber crumb and subjecting the hardened mortar obtained from this mixture to the temperature of 135°C.

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Section: Introductionmentioning

confidence: 99%

Effect of Rise in Temperature (250°C) on the Physico-Mechanical Properties of Rubber Mortars

Assia,

Messaouda,

Salima

et al. 2023

Advances in Materials Science

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“…Numerous researchers have so far focused on CPB's key components such as physical [30], chemical [31], rheological [32], and mechanical properties [33]. However, the mininginduced environmental problems have led rethinking mine operators to reduce or eliminate the presence of pyritic tailings accumulated in the dams [34][35][36][37]. Aldhafeeri and Fall [38] experimentally investigated the effect of cemented paste tailings (CPT) on the reactivity of the initial sulfate content by conducting O2 consumption tests on backfill samples and observed that CPT's reactivity augmented with growing sulfate concentration.…”

Section: Introductionmentioning

confidence: 99%

Recycling Dam Tailings as Cemented Mine Backfill: Mechanical and Geotechnical Properties

Kasap

Yilmaz

Guner

et al. 2022

Advances in Materials Science and Engineering

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As a result of developing technology and scientific studies, employing dam tailings as critical raw material and vital economic reserve has become widespread recently. Employing dam tailings as a main ingredient of CPB (cemented paste backfill) can offer benefits to mining operations. This study deals with the use of dam tailings in CPB, considering the mechanical and geotechnical aspects. CPB was prepared at fixed solid and cement contents (72%, and 5%, respectively) and tested for different cure ages varying from 3 to 56 days. The results disclosed that the strength of filling increased over time, with the exception of 56-day cured CPB having high sulfur minerals where strength decreased sharply. The reasons behind these strength surges could be clarified by CPB’s basicity, which quickens the hydration of cement. Voids between tailings grains are also occupied by hydration products, resulting in the high strengths. Due to the fact that higher sulfate contents can cause lower pH values within CPB, this is one of the factors that should be considered for the backfill’s strength performance. The cement tends to increase the backfill’s pH in short term, but pH of long-term cured backfills decreases because of dam tailings which is inclined to acid formations and erosions. This is a sign that the deformation properties of CPB are deteriorated. Depending on curing time, CPB’s water content and void ratio decrease, but their surface areas increase. The resulting data will endow to better apprehend the effects of dam tailings on CPB quality integrating cost and quality.

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Strength and microstructure evolution in cemented mine backfill with low and high pH pyritic tailings: Effect of mineral admixtures

Sari

Yılmaz

Kasap

et al. 2022

Construction and Building Materials

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Strength Analysis and Optimization of Alkali Activated Slag Backfills Through Response Surface Methodology

Cited by 12 publications

References 74 publications

Effect of Rise in Temperature (250°C) on the Physico-Mechanical Properties of Rubber Mortars

Effect of Rise in Temperature (250°C) on the Physico-Mechanical Properties of Rubber Mortars

Recycling Dam Tailings as Cemented Mine Backfill: Mechanical and Geotechnical Properties

Strength and microstructure evolution in cemented mine backfill with low and high pH pyritic tailings: Effect of mineral admixtures

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