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不同矿物掺合料透水混凝土体系的硬化性能及微观结构
作者：安生霞1，2，3，4，刘成奎1，2，3，4，李万琴1，2，3，4，段秉煜1，2，3，4
（1.青海省建筑建材科学研究院有限责任公司，青海 西宁 810008；
2.青海省建筑工程质量检测站，青海 西宁 810008；
2.青海省建筑工程质量检测站，青海 西宁 810008；
3.青海省高原绿色建筑与生态社区重点实验室，青海 西宁 810008；
4.青海省高原绿色建筑与建材工程技术研究中心，青海 西宁 810008）
摘要：研究了不同矿物掺合料掺量对透水混凝土力学性能的影响，并对透水混凝土的物相组成和微观形貌进行了分析。结果表明：随矿粉和硅灰掺量的增加，透水混凝土的抗压强度先降低后提高；随粉煤灰掺量的增加，透水混凝土的抗压强度逐渐提高。矿粉和粉煤灰对透水混凝土的早期抗压强度有明显降低作用。微观分析表明：矿粉、粉煤灰或硅灰掺量较少时，水化产物微观形貌的改变是透水混凝土抗压强度降低或提高不明显的主要原因；矿粉、粉煤灰和硅灰掺量较多时，C-S-H凝胶和AFt晶体含量的增多和水化产物微观形貌的改善是透水混凝土抗压强度提高的主要原因。矿粉和粉煤灰不同程度上对透水混凝土具有缓凝作用。
关键词：透水混凝土；矿粉；粉煤灰；硅灰；抗压强度
中图分类号：TU528.2 文献标识码：A 文章编号：1001-702X（2021）01-0024-06
The hardening characteristics and microstructure of pervious concrete with different mineral mixtures
AN Shengxia1，2，3，4，LIU Chengkui1，2，3，4，LI Wanqin1，2，3，4，DUAN Bingyu1，2，3，4
（1.Qinghai Building and Materials Research Co. Ltd.，Xining 810008，China；
2.Qinghai Construction Engineering Quality Inspection Station，Xining 810008，China；
3.The Key Lab of Plateau Building and Eco-community in Qinghai，Xining 810008，China；4.Qinghai Engineering and Technology Research Center of Plateau Green Building and Construction Materials，Xining 810008，China）
Abstract：The influence of difference contents of active admixture on the mechanical property of pervious concrete was studied，and the component and microstructure of the pervious concrete were discussed. The results demonstrate that pervious concrete compressive strength is firstly decreased and then increased with the increase of added ground slag or silica fume，while pervious concrete compressive strength increased with increasing content of fly ash. Ground slag and fly ash can significantly decrease the early compressive strength of pervious concrete. Microscopic analysis showed the main reason of decreasing or improving compressive strength is the change of microstructure of hydration products when ground slag，fly ash or silica fume is less. While the main reason of improving compressive strength is the improvement of microstructure of hydration products and the increase of C-S-H gel and AFt content when ground slag，fly ash or silica fume is more. Besides，this result indicates that addition of ground slag and fly ash has an obvious setting retarding effect on pervious concrete.
Key words：pervious concrete，ground slag，fly ash，silica fume，compressive strength