Jing Yu¹, Jie Ren², Guangming Shen³, Weixiang Sun², Hui Wang^4,*

FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.9, pp. 2385-2398, 2023, DOI:10.32604/fdmp.2023.027877

Abstract In this paper, the influence of NaCl freeze-thaw (F-T) cycles and dry-wet (D-W) alternations on the flexural, compressive and bonding strengths of alkali-activated fly ash (FA) and a blast furnace slag powder (BFS) is investigated. The considered NaCl concentration is 3%. The effect of polypropylene fibers on the mechanical strengths is also examined. Scanning electron microscopy (SEM), thermogravimetry (TG) and X-ray diffraction (XRD) are selected to discern the mechanisms underpinning the NaCl-induced erosion. The obtained results indicate that the best results in terms of material resistance are obtained with admixtures containing 60% BFS and 40% FA in terms of mass… More >

Daguan Huang^1,*, Ditao Niu², Li Su^3,*, Hao Zheng², Qiang Fu², Yunhe Liu¹

Journal of Renewable Materials, Vol.10, No.12, pp. 3477-3489, 2022, DOI:10.32604/jrm.2022.021282

Abstract Coral materials can replace concrete aggregates and achieve material self-sufficiency for reducing the construction costs of island projects. This paper studies the effects of different mineral admixtures on the properties of coral aggregate concrete (CAC). The chloride concentration of CAC after different erosion times is measured using the potentiometric method, and the porosity of the CAC is calculated using thermogravimetric and drying methods. The chloride concentration of the CAC presents a two-phases distribution. The peak chloride concentration followed a power function, increasing with the erosion time. The chloride diffusion coefficient of CAC is 7.9%– 37.5% larger than that of ordinary… More >

Xupeng Chen^1,*, Zhuowen Sun², Jianyong Pang¹

Journal of Renewable Materials, Vol.10, No.9, pp. 2489-2508, 2022, DOI: 10.32604/jrm.2022.019404

Abstract Mineral admixture concrete is a renewable material. It requires less cement than ordinary concrete and is thus beneficial for economical use of resources and environmental protection. To examine the impact of chloride salt on the durability of mineral admixture concrete under various conditions, in this study, test blocks are divided into two major groups: in one group, the test block is eroded by chloride salt on the interior and by sulphate/ magnesium salts on the exterior, and in the second group, the test block is eroded by external chloride/sulphate/ magnesium salts. Clean water is considered the control group. Dry-wet alternation… More > Graphic Abstract

Yingchun Yang^1,*, Liqing Chen¹, Yuguang Mao²

Journal of Renewable Materials, Vol.9, No.12, pp. 2261-2276, 2021, DOI:10.32604/jrm.2021.015793

Abstract Improving the activity of Iron Ore Tailings (IOTs) to utilize them as a mineral admixture in cement-based minerals is still challenging. In this paper, the wet grinding technology was employed to stimulate the activity of IOTs, and the traditional dry grinding method was used as a reference. The effect of wet grinding on the activation of IOTs was evaluated through ion leaching from an alkaline solution and the reactivity index. Additionally, a detailed comparison between Dry-grinding Iron Ore Tailings (DIOTs) and Wet-grinding Iron Ore Tailings (WIOTs) was made. This comparison was based on particle characteristics, crystal structures, chemical structure, and… More > Graphic Abstract

Guibin Liu¹, Meinan Wang², Qi Yu¹, Qiuyi Li², Liang Wang^2,*

Journal of Renewable Materials, Vol.9, No.11, pp. 2051-2065, 2021, DOI:10.32604/jrm.2021.015398

Abstract The strength and durability of concrete will be significantly reduced at high volume of mineral admixture, and the poor early strength of concrete also still needs to be solved. In this investigation, a highly active alkaline electrolyzed waters was used as mixing water to improve the early strength and enhance the durability of green concrete with high volume mineral admixture, the influences of alkaline electrolyzed water (AEW) on hydration activity of mineral admixture and durability of concrete were determined. The results showed that compared with natural tap water, AEW can accelerate early hydration process of cement in concrete and produce… More > Graphic Abstract