Self-healing potential of supplementary cementitious materials in cement mortars: Sorptivity and pore structure

被引：33
|
作者：
Maddalena, Riccardo [1 ]
Taha, Hussameldin [2 ]
Gardner, Diane [1 ]
机构：
[1] Cardiff Univ, Sch Engn, Cardiff CF24 3AA, Wales
[2] Univ Bath, Dept Architecture & Civil Engn, Bath BA2 7AY, Avon, England
来源：
DEVELOPMENTS IN THE BUILT ENVIRONMENT | 2021年 / 6卷
基金：
英国工程与自然科学研究理事会;
关键词：
Autogenous healing; Mortar; Sorptivity; Cement replacement; MERCURY INTRUSION POROSIMETRY; BLAST-FURNACE SLAG; OF-THE-ART; FLY-ASH; MECHANICAL-PROPERTIES; WATER SORPTIVITY; PERFORMANCE; CONCRETE; ABSORPTION; HYDRATION;
D O I：
10.1016/j.dibe.2021.100044
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
This paper presents the autogenic self-healing potential of Portland cement (PC) blends made with conventional supplementary cementitious materials (SCMs), to improve the water-tightness by reducing the overall pore size. Mortar samples were prepared by mixing PC, sand and water, and partially replacing PC by either silica fume (SF), pulverised fuel ash (PFA), or ground granulated blast-furnace slag (GGBS). Damaged samples were subjected to a water bath to heal microcracks and recover the water-tightness, by further hydration of the starting minerals. Water absorption and density measurements in undamaged, damaged and healed conditions were used to determine the autogenous healing potential of SCMs mixes, showing a post-healing absorption recovery of up to 68% compared to the mix with PC only. Thermal analysis, XRD and MIP measurements confirmed the capability of SCMs to promote the formation of hydrated phases, and reduce the overall pore size by more than 88% compared to PC mixes.
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页数：11
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