摘要
人工砂在生产过程中不可避免地会产生较多的石粉,这些石粉会对混凝土性能等产生重要影响。试验研究了石粉含量分别为15%、28%的人工砂对C30混凝土绝热温升变化的影响。结果表明:在保证混凝土强度等级相同情况下,适当提高人工砂中石粉含量可以通过优化混凝土配合,减少水泥的水化放热从而降低水化热峰值并延缓峰值到达的时间;温升计算值与实测值对比发现,计算结果普遍偏大,理论模型适用于早龄期(小于70h)混凝土的绝热温升预测。研究成果对混凝土温度控制和施工质量的保证具有参考价值。
In its production process, artificial sand will inevitably produce more stone powder, which will have an important impact on the performance of concrete. The effects of artificial sand with 15% and 28% stone powder on the adiabatic temperature rise of C30 concrete were studied. The results show that under the same strength grade of concrete, properly increasing the content of stone powder in artificial sand can reduce the peak value of hydration heat and delay the arrival time of peak value by optimizing the mixing of concrete and reducing the hydration heat release of cement. Comparing the calculated and measured values of temperature rise, it is found that the calculated results are generally larger, and the theoretical model is suitable for predicting the adiabatic temperature rise of early-age(< 70 h) concrete. The research results have reference value for concrete temperature control and construction quality assurance.
作者
唐云宏
李飞隼
晋良海
TANG Yunhong;LI Feisun;JIN Lianghai(SINOHYDRO Bureau 7 Co.,Ltd.,Chengdu 610081,China;Hubei Water Resource Technical College,Wuhan 430070,China;College of Hydraulic & Environmental Engineering,China Three Gorges University,Yichang 443002,China)
出处
《人民珠江》
2019年第8期67-71,共5页
Pearl River
基金
国家自然科学基金(51609128)
水电工程施工与管理湖北省重点实验室(三峡大学)开放基金(2016KSD13、2016KSD06)
关键词
人工砂
水工混凝土
石粉含量
绝热温升
artificial sand
hydraulic concrete
stone powder content
adiabatic temperature rise
