基于等效龄期的大体积粉煤灰混凝土强度检测与分析  

Test and analysis of strength of mass fly-ash concrete based on equivalent age

作　　者：赵双权[1] 毛明杰[1] 张文博[1] 冯佳 

机构地区：[1]宁夏大学土木与水利工程学院,宁夏银川750021 [2]银川市威尔信商品混凝土工程有限公司,宁夏银川750002

出　　处：《混凝土》2017年第7期47-49,共3页Concrete

基　　金：国家自然科学基金(51568055);宁夏高校科学研究项目(NGY2016020);宁夏大学研究生创新项目(GIP2017051)

摘　　要：以秋冬季自然养护大体积粉煤灰混凝土为研究对象,实施了龄期14、28、56、91 d的钻芯和回弹试验。对不同钻芯深度的芯样强度进行了比较,基于等效龄期对钻芯和回弹的强度测试结果进行了比较研究。结果表明:秋冬季自然养护条件下,至龄期91 d时混凝土抗压强度才接近其设计强度;龄期14 d钻芯试样内部强度高于外部强度,28 d后试样内外钻芯强度趋于一致;与推算标准养护强度相比,钻芯强度稳定在其0.84~0.88之间,而回弹强度均在其1.21倍以上,且随龄期增长变化较大。钻芯强度更能体现实际结构混凝土强度。The autumn to winter site-curing mass fly-ash concrete was studied.The core drilling and rebound compressive strength tests were carried out in age 14,28,56,91 d.At first,the compressive strength of drilling cores in different depth was investigated.After that,a comparative study of test results between core drilling and rebound was conducted.Results show that the compressive strength of autumn to winter site-curing concrete achieves the design strength at age of 91 d.At the age of 14 d,the internal strength of core specimen is higher than that of external strength,and after the age of 28 d,the internal and external strength tend to be consistent.Compared with the calculated standard curing strength,the core strength is stable at the range of 0.84~0.88 times,while the rebound strength is more than 1.21 times and varies significantly with the age extending.Core drilling strength can reflect the actual structural concrete strength better.

关 键 词：等效龄期 抗压强度 钻芯 回弹 大体积混凝土 

分 类 号：TU528.01[建筑科学—建筑技术科学]