硅酸盐通报2017，Vol.36Issue(1)：20-26,7.
偏高岭土对蒸养混凝土强度和毛细吸水性的影响
Effect of Metakaolin on Compressive Strength and Capillary Water Sorptivity of Steam-cured Concrete
摘要
Abstract
The compressive strength and capillary water absorption of steam-cured concrete with 30%replacement of cement by metakaolin and other mineral admixtures were investigated. The mechanism was also analysed using differential analysis( DTA) , thermogravimetric analysis ( TGA) and scanning electron microscope( SEM) . Results show that the presence of metakaolin( MK) is greatly beneficial in increasing the demoulding compressive strength of steam-cured concrete. The demoulding compressive strength of steam-cured concrete containing 10% fly ash( FA) and 20% MK is 23% higher than that of the blank concrete incorporating no MK, and 17% higher than that of the concrete incorporating FA and ground granulated blast furnace slag ( GGBS) . Use of FA, GGBS and MK as cementitious materials remarkably decrease the water sorptivity. For the steam-cured concrete containing MK, both the capillary sorptivity coefficient and the total mass of water absorption are the lowest. Thermal analysis and SEM images indicate that the main cuase for the improvement of demoulding compressive strength is the pozzolanic reaction between MK and Ca( OH) 2 liberated from cement at early ages due to thermal activation under 60 ℃ steam curing conditions. The consumption of Ca ( OH ) 2 and the formation of more hydration products are observed, thus the concrete become denser.关键词
蒸养混凝土/偏高岭土/抗压强度/毛细吸水性/火山灰反应Key words
steam-cured concrete/metakaolin/compressive strength/capillary water absorption/pozzolanic reaction分类
建筑与水利引用本文复制引用
徐雯雯,贺智敏,柳俊哲,巴明芳,王建民..偏高岭土对蒸养混凝土强度和毛细吸水性的影响[J].硅酸盐通报,2017,36(1):20-26,7.基金项目
国家自然科学基金(51478227) （51478227）
宁波市自然科学基金(2015A610300) （2015A610300）
宁波大学胡岚优秀博士基金、学科项目(XKL15D231) （XKL15D231）
