矿物掺合料复掺对超高性能湿接缝混凝土性能的影响

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中文摘要：采用石灰石粉和粉煤灰微珠作为调节超高性能湿接缝混凝土性能的矿物掺合料,通过设置石灰石粉和粉煤灰微珠的不同复掺比例,研究了两种矿物掺合料对超高性能湿接缝混凝土流变性能、力学性能、收缩性能和抗渗性能的影响,并采用水化热分析了超高性能湿接缝混凝土的水化特性.结果表明:当石灰石粉掺量高于30％(质量分数)时,随着石灰石粉掺量的增加,超高性能湿接缝混凝土的塑性黏度先增大后减小,复掺50％石灰石粉和50％(质量分数)粉煤灰微珠时,混凝土塑性黏度可降低38.0％;掺入石灰石粉可以促进水泥的早期水化,提高超高性能湿接缝混凝土的早期抗压强度,3 d抗压强度最大涨幅为11.6％;复掺石灰石粉和粉煤灰微珠可以降低超高性能湿接缝混凝土的自收缩;当复掺30％石灰石粉时,超高性能湿接缝混凝土的抗渗性能最优,28 d氯离子扩散系数为0.15 ×10-12 m2/s.

外文标题：Effects of Mixing Mineral Admixtures on Properties of Ultra High Performance Wet-Joint Concrete

外文摘要：Limestone powder and fly ash microbeads were used as mineral admixtures to adjust the properties of ultra high performance wet-joint concrete.The effects of limestone powder and fly ash microbeads on rheological properties,mechanical properties,shrinkage properties and impermeability of ultra high performance wet-joint concrete were studied by setting different mixing ratios.In addition,the hydration performance of ultra high performance wet-joint concrete was analyzed by hydration heat.The results show that when limestone powder is higher than 30％(mass fraction),with the increase content of limestone powder,the plastic viscosity of ultra high performance wet-joint concrete increases first and then decreases.The plastic viscosity of concrete is reduced by 38.0％when added with 50％limestone powder and 50％(mass fraction)fly ash microbeads.The addition of limestone powder promotes the early hydration of cement and improves the early compressive strength of ultra high performance wet-joint concrete,and the maximum growth rate of 3 d compressive strength is 11.6％.The autogenous shrinkage of ultra high performance wet-joint concrete is reduced by adding limestone powder and fly ash microbeads.The impermeability of ultra high performance wet-joint concrete is the best when the content of limestone powder is 30％,and the 28 d chloride ion diffusion coefficient is 0.15 x 10-12 m2/s.

外文关键词：

ultra high performance wet-joint concretelimestone powderfly ash microbeadplastic viscosityhydration heatcompressive strengthshrinkage propertyimpermeability property

作者：

盖珂瑜、龙勇、陈露一、李信、刘开志、王宇、孙涛

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作者单位：

桥梁智能与绿色建造全国重点实验室,武汉 430034

中铁大桥科学研究院有限公司,武汉 430034

中铁桥研科技有限公司,武汉 430034

武汉理工大学硅酸盐建筑材料国家重点实验室,武汉 430070

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关键词：

超高性能湿接缝混凝土石灰石粉粉煤灰微珠塑性黏度水化热抗压强度收缩性能抗渗性能

基金：

湖北省科技厅创新发展项目中国中铁股份有限公司科技研发计划

项目编号：

2021BLB1552020-25-重点

出版年：

2024

硅酸盐通报

中国硅酸盐学会中材人工晶体研究院

硅酸盐通报

CSTPCD北大核心

影响因子：0.698

ISSN：1001-1625

年,卷(期)：2024.43(3)

参考文献量22