云南地材复合掺合料抑制花岗岩骨料碱-硅酸反应活性研究

关键字：云南,地材,复合,掺合,料,抑制,花岗岩,骨料,碱,

（1.贵州省公路工程集团有限公司，贵州 贵阳  550000；2.中国建筑科学研究院有限公司，北京  100013）

摘要：针对云南地区具有潜在碱-硅酸反应活性的花岗岩骨料以及当地传统掺合料资源稀缺等现状，研究当地石灰石粉、燃煤炉渣、硅灰等地材与粉煤灰形成复合掺合料对花岗岩骨料碱-硅酸反应活性的抑制作用。结果表明，粉煤灰与硅灰具有良好的复合效应，采用15%的粉煤灰与5%硅灰复合能够有效抑制花岗岩骨料碱-硅酸反应活性。而采用粉煤灰、燃煤炉渣粉、硅灰多组分复合时，各组分抑制作用充分协同发挥，达到抑制有效性要求的粉煤灰掺量可进一步降低至10%。

关键词：复合掺合料；花岗岩；碱-硅酸反应活性；抑制有效性

中图分类号：TU528.04        文献标识码：A        文章编号：1001-702X（2019）08-0077-03

 

Study on the inhibition of alkali-silicic acid reactivity of granite aggregates by Yunnan composite admixture

LIU Xiaofan1，WU Hang1，ZHAO Lixue1，HE Yang2，GAO Chao2，XIA Jingliang2

（1.Guizhou Highway Engineering Group Co. Ltd.，Guiyang 550000，China；2.China Academy of Building Research Co. Ltd.，Beijing 100013，China）

Abstract：Aiming at the current situation of potential alkali-silicic acid-reactive granite aggregates in Yunnan and the scarcity of local traditional admixture resources，the inhibitory effect of composite admixtures，which formed by local limestone powder，coal-fired slag，silica fume and fly ash，on the alkali-silicic acid reactivity of granite aggregates was studied. The results show that fly ash and silica fume have a good composite effect，and 15% fly ash with 5% silica fume can effectively inhibit the alkali-silicic acid reactivity of granite aggregate. When fly ash，coal-fired slag powder and silica fume multi-component compounding are used，the inhibitory effects of each component are fully synergistically exerted，and the fly ash content can be further reduced to 10% with achieving the suppression effectiveness requirement.

Key words：composite admixture，granite，alkali-silicic acid reactivity，inhibition effectiveness