Experimental study on the engineering properties of alkali-activated GGBFS/FA concrete and constitutive models for performance prediction

Cong, Xinyu; Zhou, Wei; Elchalakani, Mohamed

doi:10.1016/j.conbuildmat.2019.117977

Cited by 37 publications

(8 citation statements)

References 55 publications

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“…It showed that, the ternary use of 20% and 30% MWTS with BFS had higher late strength compared to those of the samples having MWTS and FA. This was due to the reason that the small particles of cement and MWTS are hydraulically absorbed by BFS via chemical reaction (Cong et al 2020;Fan et al 2020). After activation of hydraulic activity, BFS reacts with free Ca(OH)2 and moisture from the hydration products to produce more C-S-H, which improves strength gain (Islam et al 1970).…”

Section: Compressive Strengthmentioning

confidence: 99%

Sustainable cement-based materials blended with recycled water treatment sludge and other various waste products as binder: Characterization and environmental-economical impacts

Kina

2023

Preprint

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Water treatment sludge (WTS) is produced daily and disposed as hazardous material. It would be advisable to use locally available waste products as supplementary cementitious materials that ensures to be disposed of without harming the environment. As novelty, this research investigated the potential of using recycled-WTS with fly ash (FA) and ground-granulated blast furnace slag (BFS) as ternary blended binders. Thus, it can provide an economical solution and alleviate adverse environmental effects of excessive production of wastes and cement production. Within this scope, the mortars with 0–30 wt% replacement of cement with modified-WTS (MWTS) were produced as binary blend and also, they were combined with FA/BFS as ternary blended binders. Therefore, optimum utilization of waste products into mortar in terms of rheological, mechanical, durability, microstructural properties and environmental-economical aspects were examined. Adding 10% recycled-WTS as binary caused higher strengths with lower porosity measured by Mercury Intrusion Porosimeter test and denser microstructure, as revealed by XRD patterns and SEM results. However, the drawbacks of using recycled-WTS, in terms of rheological parameters and environmental-economical aspects, were suppressed by adding FA/BFS with comparable strength values. Specifically, cost, CO2 footprint and embodied energy were reduced by combining 10% MWTS with FA by 8.87%, 37.88% and 33.07%, respectively, while 90-day compressive and flexural strength were 5.1% and 5.32% lower. This study developed a feasible solution to use recycled-MWTS by obtaining more eco-friendly and cost-effective cement-based materials.

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Section: Compressive Strengthmentioning

confidence: 99%

Sustainable cement-based materials blended with recycled water treatment sludge and other various waste products as binder: Characterization and environmental-economical impacts

Kina

2023

Preprint

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“…It is assumed that the constitutive relation of concrete under dynamic load is as follows [20][21][22]:…”

Section: Tunnel Concrete Lining Dynamic Damage Cracking Modelmentioning

confidence: 99%

Study on Seismic Response and Damping Measures of Surrounding Rock and Secondary Lining of Deep Tunnel

Tang¹,

Ren²

2021

Shock and Vibration

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Tunnel construction is gradually developing to areas with high in situ stress; the deeper the tunnel construction, the more intense the earthquake disturbance. Under the background of frequent earthquakes, the seismic characteristics of tunnels become an important content related to the safety and stability of engineering structures. In view of the key problems of seismic response and vibration reduction measures for complex deep buried tunnels, the methods of advanced grouting and foam concrete aseismic are studied in this paper. Firstly, through geological survey, the in situ stress and geological conditions of the study area are analyzed. The structural characteristics of surrounding rock and related rock mechanics parameters are analyzed. The failure criterion of concrete lining under dynamic load is studied theoretically, and the relevant numerical calculation parameters are modified. A numerical model based on viscous boundary conditions is established. Through numerical calculation, the seismic response of tunnel surrounding rock and lining under different damping measures is analyzed. The research results have theoretical research value and social and economic benefits for ensuring the safety and stability of tunnel structure and improving the seismic fortification level.

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“…Cong et al [29] established a constitutive model to predict the engineering properties of alkali-activated GGBS/FA concrete according to its stress-strain relationship and elastic modulus under different compression and tension loads. However, the dynamic increase factor obtained from the constitutive model presented in this study was not consistent with the experimental results.…”

Section: Introductionmentioning

confidence: 99%

Analyzing the mechanical performance of fly ash-based geopolymer concrete with different machine learning techniques

Peng

Unluer

2022

Construction and Building Materials

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Experimental study on the engineering properties of alkali-activated GGBFS/FA concrete and constitutive models for performance prediction

Cited by 37 publications

References 55 publications

Sustainable cement-based materials blended with recycled water treatment sludge and other various waste products as binder: Characterization and environmental-economical impacts

Sustainable cement-based materials blended with recycled water treatment sludge and other various waste products as binder: Characterization and environmental-economical impacts

Study on Seismic Response and Damping Measures of Surrounding Rock and Secondary Lining of Deep Tunnel

Analyzing the mechanical performance of fly ash-based geopolymer concrete with different machine learning techniques

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