摘要
近年来,因骨料质量问题而给水电工程建设带来严重影响或重大损失的情况时有发生。大藤峡水利枢纽混凝土备用料源——马鹿岭人工骨料场以石英砂岩、砂岩为主,夹少量泥质粉砂岩等,虽储量丰富、剥离量少、采运方便,但石英砂岩、砂岩有潜在碱活性危害的隐患,泥质粉砂岩等软弱夹层还可能影响混凝土强度,故质量问题成为该料场成立与否的关键。以马鹿岭人工骨料场地质勘察资料和试验数据为依据,从宏观分析与试验研究两方面入手,对料源质量进行了全面论证,得出了石英砂岩、砂岩均为有潜在危害性碱-硅酸反应类活性骨料,掺入10%~20%的粉煤灰可有效抑制其潜在的混凝土碱-骨料反应、骨料中掺入不大于5%的泥质粉砂岩等夹层对混凝土强度影响不大,料场混合开采骨料所制混凝土强度可满足设计要求的结论,为最终确立该料场作为工程混凝土骨料备用料源提供了科学依据。
Recently,the phenomenon that the quality problems of aggregate make seriously impact or significant loss to the hydropower project construction occurs frequently.The Maluling artificial aggregate field,as jury stocking yard of concrete aggregate of the Datengxia Hydro-junction,was selected as an emphasis research by field surveys and comprehensive comparison.The material layers of the stocking yard mainly compose of quartz sandstone and sandstone intercalated with argillaceous siltstone.In spite of the rich reserves,the less stripping volume and the convenient transportation,the alkali activity of quartz sandstone and sandstone and the soft interlayer will influence the concrete strength.Therefore,the quality of the artificial aggregate field is the key to establish stocking yard.Based on the geological investigation and experimental research data,the quality evaluation of the stocking yard has been comprehensively demonstrated from macroscopic analysis and experimental research.The result indicated that the quartz sandstone and sandstone is the active aggregate which is belong to the potential harmfulness alkali silica-reaction type and the potential alkali silica-reaction will effectively inhibited by adding 10%~20%fly ash;the aggregate mixing not greater than 5% of the argillaceous siltstone interlayer has little impact on the concrete strength and the concrete strength can meet the design requirements.Thus,it provides scientific basis for selecting this stock ground as the reserve source of concrete aggregate.
出处
《水电能源科学》
北大核心
2016年第9期161-164,114,共5页
Water Resources and Power
关键词
大藤峡水利枢纽
混凝土骨料
质量评价
碱活性
Datengxia Hydro-junction
concrete aggregate
quality evaluation
alkali activity