التفاصيل البيبلوغرافية
| العنوان: |
Effect of recycled aggregate and supplementary cementitious material on mechanical properties and chloride permeability of concrete. |
| المؤلفون: |
Wang, Yuanzhan1 (AUTHOR) yzwang@tju.edu.cn, Liu, Zhen1 (AUTHOR) zliu@tju.edu.cn, Wang, Yuchi1,2 (AUTHOR) 595810413@qq.com, Li, Qingmei1 (AUTHOR) qingmei@tju.edu.cn, Gong, Xiaolong1 (AUTHOR) gongxlomartin@163.com, Zhao, Yupeng3 (AUTHOR) zhaoyupeng@tju.edu.cn |
| المصدر: |
Journal of Cleaner Production. Oct2022, Vol. 369, pN.PAG-N.PAG. 1p. |
| مصطلحات موضوعية: |
*MECHANICAL behavior of materials, *RECYCLED concrete aggregates, *POWDERED glass, *CONSTRUCTION & demolition debris, *MINERAL aggregates, *CHLORIDES |
| مستخلص: |
With impending demand for sustainable development, construction wastes as recycled aggregate (RA) to produce recycled aggregate concrete (RAC) is inevitable. However, RA makes adverse effect on performance of RAC. To enhance its performance, the supplementary cementitious materials (SCM), including ground granulated blast furnace slag, red mud, and glass powder, were used to partially substitute cement. In this investigation, the plain cement concrete and mineral-admixture concrete with four replacement ratios of RA were poured. For each mixture, the compressive strength, dynamic elastic modulus, and resistivity were determined; Besides, chloride penetration test was conducted in a tidal cycling simulation device, in which specimens with dimension of 100 × 100 × 400 mm3 were used to explore the effect of drying-wetting time ratios R D/W on chloride diffusion. It was found concrete with 50% RA exhibits improved compressive strength and equivalent chloride resistance through 25% SCM addition. Concrete containing 100% RA achieves equivalent or even superior chloride resistance to control group as SCM added by 45%. With the increase of R D/W , the diffusion of chloride is more serious. Considering the inhomogeneity of concrete pores, a double-porosity transport model solution was derived based on Fick's second law. Combined with test results, a time-dependent model was then established to predict chloride concentration in concrete containing RA and SCM. Furthermore, an analytical solution of cumulative chloride content diffused into concrete was derived to quantify chloride permeability. Subsequently, a linear correlation between chloride permeability and resistivity is confirmed. This investigation will encourage the use of RA in marine engineering, thereby leading to a more sustainable and cleaner production. [Display omitted] • Properties of concrete with recycled aggregate and mineral admixture were studied. • Effect of elevation in tidal zone on chloride diffusion was explored experimentally. • A double-porosity transport model solution was derived based on Fick's second law. • An analytical solution of cumulative content of chloride was derived and applied. • A linear correlation between chloride permeability and resistivity was confirmed. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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