Experimental investigation on replacing cement by sintered limestone ash from the steelmaking industry for cement-stabilized soil: Engineering performances and micro-scale analysis

Xu, Fei; Hua, Wei; Qian, Wenxun; Chen, Xunjie; Xu, Tianlei; He, Yedong; Wen, Guocheng

doi:10.1016/j.conbuildmat.2019.117425

Cited by 22 publications

(4 citation statements)

References 39 publications

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“…The common products that were detected in all patterns included CSH, AFt, gismondine and Na zeolite. Meanwhile, the reaction products CSH and Na zeolite also produced humps within the approximate 2θ range of 30-34 • [44,45] in every pattern, which were the major diffraction characteristics of those minerals. Notably, the Na zeolite in this study was composed of natrolite and faujasite Na.…”

Section: Mineralogy Analysis and Validationmentioning

confidence: 98%

An Investigation on Mineral Dissolution and Precipitation in Cement-Stabilized Soils: Thermodynamic Modeling and Experimental Analysis

Hua

et al. 2022

Applied Sciences

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Thermodynamic modeling helps to reveal insights into the basic chemical kinetics of dissolution and precipitation in cementitious materials, but relevant applications to cement-stabilized soils have seldom been reported. Based on the thermodynamic database of Cemdata18 and the pore solution composition of cement-stabilized soils, this study formulated a specialized thermodynamic model, using essential thermodynamic constants for soil minerals that were calculated to ensure the model’s accuracy. Two commercial admixtures of alkaline activator and polynaphthalene sulfonate were selected for the different modification mechanisms and plain and modified cement-stabilized soils were prepared. Compressive strength was tested to determine the specimens for pore solution analysis and the influences of the admixture type and dose on dissolution and precipitation were investigated by modeling the ionic activity products and saturation indexes. An X-ray diffraction (XRD) analysis was performed to verify and complement the thermodynamic results. The major research findings were that (1) thermodynamic modeling can be reliably applied to cement-stabilized soils by providing the essential thermodynamic data and an appropriate product model, (2) the pozzolanic reaction is accelerated by increasing the OH− concentration in the pore solution, while the cement hydration is highly dependent on the dissolution of Ca(OH)2 and the relevant complexes and (3) the dissolution equilibrium of Ca(OH)2 is directly affected by the alkaline activator dissolution and is indirectly affected by the polynaphthalene sulfonate adsorption of the reactants.

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Section: Mineralogy Analysis and Validationmentioning

confidence: 98%

An Investigation on Mineral Dissolution and Precipitation in Cement-Stabilized Soils: Thermodynamic Modeling and Experimental Analysis

Hua

et al. 2022

Applied Sciences

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“…The mass loss observed in the thermogravimetric curve within the temperature ranges of 300 ℃, 300 ℃ -500 ℃, and 600 ℃ -800 ℃ is attributed to the thermal decomposition of C-S-H/AFt, CH, and CC̅ , respectively. This delineates the thermal decomposition effects of these specific phases within their designated temperature intervals [19][20][21].…”

Section: Phase Analysismentioning

confidence: 99%

Hydration characteristics and kinetic analysis of polyacrylamide (PAM) anti-dispersion cement-based materials

He,

Wei,

et al. 2024

J. Phys.: Conf. Ser.

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Through phase analysis and quantitative calculations of the hydration process, the inclusion of polyacrylamide (PAM) in Anti-dispersion Water Paste affects its hydration characteristics is discovered. Specifically, the presence of PAM reduces early reactivity while accelerating progress in the middle to late stages of hydration. By employing K-D hydration kinetic analysis, it is confirmed that the use of PAM results in the formation of a multi-nucleation homogeneous point system within the cement slurry. This system prolongs the NG (nucleation and growth) process time, increases the hydration degree during the transition from NG to I (induction) process, and inhibits the heterogeneous precipitation of hydration products. Consequently, the early hydration of cement is hindered. As the hydration reaction advances, the microstructure of the product under multi-nucleation points increases the specific surface area. This gradual breakthrough of the hydration threshold barrier shortens the duration of the phase boundary reaction process and reduces the hydration degree during the I and D (diffusion) processes. Consequently, the late-stage hydration rate is accelerated.

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“…Different traditional cementitious materials, i.e., cement and lime, are commonly used as ameliorators for the mechanical properties of the fat clay (Eyo and Abbey 2021 ). However, to promote natural resource conservation and environmental burden reduction, the use of the aforementioned material is needed to be restricted by incorporating possible substitute waste materials (Xu et al 2020 ). In this regard, the use of silica fume (SF) in cementitious stabilization of fat clay could be a promising dimension since SF is widely incorporated as a cementitious material in the concrete (Al-Soudany 2018 ; Phanikumar 2020 ; Singh et al 2020a , b ).…”

Section: Introductionmentioning

confidence: 99%

Optimization of COVID-19 face mask waste fibers and silica fume as a balanced mechanical ameliorator of fat clay using response surface methodology

Rehman

Khalid

2021

Environ Sci Pollut Res

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The balanced amelioration of mechanical characteristics of fat clay with an additive refers to the attainment of high strength without compromising ductility, which is unattainable by solitary usage of a cementing additive. For this purpose, an amalgamated binary admixture (ABA) is proposed by assimilating shredded face mask (FM) waste, which is posing serious environmental concerns these days, with a cementitious waste material, i.e., silica fume (SF). However, for such ABA, the optimization of mix design is desirable because an excessive amount of one component could disturb the required balance. To address this issue, response surface methodology (RSM) is used in the current study, which is a strong technique used during the process of production to develop, improve, and optimize product inputs. Several experiments are designed and conducted to evaluate mechanical responses, i.e., unconfined compressive strength ( q u ), brittleness index ( I B ), deformability index ( I D ), and California bearing ratio ( CBR ) value, of treated fat clay by varying mix designs of ABA. Based on the test results, mathematical models are developed which are found to be statistically valid to predict the subjected responses using SF and FM as inputs. Afterward, an optimized mix design is determined by integrating developed models with a desirability function model and setting maximization of strength and ductility as the optimization goals. An ABA having 7.9% SF and 1.2% FM is observed to provide the highest strength and ductility for multiple applications, i.e., road and buildings, with desirability factor close to unity; responses of which are also validated by performing tests. Furthermore, analysis of cleaning aspect shows that the use of optimized ABA in place of cement for subgrade improvement of 1 km two-lane road could avoid CO 2 emission of around 79,032 kg of C, save 42,720 kWh and 1174.8 GJ of electrical and thermal energy, respectively, and clean 43 Mg of FM waste; however, astute protocols of COVID-19 FM waste handling and disinfection are needed to be established and followed.

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Experimental investigation on replacing cement by sintered limestone ash from the steelmaking industry for cement-stabilized soil: Engineering performances and micro-scale analysis

Cited by 22 publications

References 39 publications

An Investigation on Mineral Dissolution and Precipitation in Cement-Stabilized Soils: Thermodynamic Modeling and Experimental Analysis

An Investigation on Mineral Dissolution and Precipitation in Cement-Stabilized Soils: Thermodynamic Modeling and Experimental Analysis

Hydration characteristics and kinetic analysis of polyacrylamide (PAM) anti-dispersion cement-based materials

Optimization of COVID-19 face mask waste fibers and silica fume as a balanced mechanical ameliorator of fat clay using response surface methodology

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