首页|复合石灰石粉混凝土耐久性能试验研究

复合石灰石粉混凝土耐久性能试验研究

扫码查看
原文链接
  • 万方数据
  • 维普
为探究不同水胶比及石灰石粉等矿物掺合料对复合石灰石粉混凝土耐久性能的影响,对普通混凝土、石灰石粉-矿渣混凝土以及石灰石粉-矿渣-粉煤灰混凝土的抗碳化、抗冻融、抗氯离子侵蚀等耐久性能展开试验研究.结果表明:在矿物掺合料总掺量固定为50％情况下,①降低水胶比可以提高复合石灰石粉混凝土的抗碳化、抗冻融、抗氯离子侵蚀性能;②加入石灰石粉可以优化复合石灰石粉混凝土胶凝材料体系的颗粒级配,从而改善了抗冻融和抗氯离子侵蚀性能;③矿渣因火山灰效应引起二次水化,一方面降低了复合石灰石粉混凝土的碱性,弱化了抗碳化性能,另一方面水化胶凝产物提高了复合石灰石粉混凝土的密实性,改善了抗冻融和抗氯离子侵蚀性能;④粉煤灰等比例代替部分矿渣,对复合石灰石粉混凝土早期的抗碳化、抗冻融和抗氯离子侵蚀等耐久性能不利.
Experimental study on durability performance of composite limestone powder concrete
In order to investigate the effects of different water-binder ratios and mineral admixtures such as limestone powder on the durability of composite limestone powder concrete,experimental studies were conducted on the durability performance of ordinary con-crete,limestone powder-slag concrete and limestone powder-slag-fly ash concrete with respect to carbonation,freeze-thaw and chloride ion erosion.The results show that under the condition that the total amount of mineral admixture is fixed at 50％,①reduce the water-binder ra-tio can improve the composite limestone powder concrete resistance to carbonation,freeze-thaw,chloride ion erosion performance;②the addition of limestone powder can optimize the particle gradation of the composite limestone powder concrete cementitious material sys-tem,thus improving the resistance to freeze-thaw and chloride ion erosion;③slag caused by the volcanic ash effect of secondary hydration,on the one hand,reduces the alkalinity of composite limestone powder concrete,weakening the resistance to carbonation,on the other hand,the hydration gelation products improve the compactness of composite limestone powder concrete,improving the resistance to freeze-thaw and chloride ion erosion;④Fly ash in equal proportions instead of slag is detrimental to the durability of composite limestone powder concrete in terms of resistance to carbonation,freeze-thaw and chloride ion attack in the early stage.

water-binder ratiocomposite limestone powder concretecarbonationfreeze-thawchloride ion attack

武业忱、吕恒林、章明明、李杭、戚传康

展开 >

中国矿业大学力学与土木工程学院,江苏徐州 221116

中国矿业大学江苏省工程环境影响与结构安全重点实验室,江苏徐州 221116

江苏建筑职业技术学院江苏建筑节能与建筑技术协同创新中心,江苏徐州 221116

水胶比 复合石灰石粉混凝土 碳化 冻融 氯离子侵蚀

国家重点研发计划课题徐州市重点研发计划项目(社会发展)江苏建筑节能与建造技术协同创新中心2021年重大研究基金计划项目江苏建筑节能与建造技术协同创新中心2021年青年博士基金计划项目中国矿业大学研究生创新计划项目

2018YFD1100203KC16SS088SJXTZD2102SJXTBS21282022WLKXJ054

2024

10.3969/j.issn.1002-3550.2024.06.017

混凝土
中国建筑东北设计研究院有限公司

混凝土

CSTPCD北大核心
影响因子：0.844
ISSN：1002-3550
年,卷(期)：2024.(6)