摘要
研究不同粉煤灰(20%、30%、40%)、矿粉微渣掺量及聚羧酸减水剂掺量(0、0.6%、0.8%、1.0%、1.2%)等多因素对寒区水工混凝土力学性能、抗碳化能力及抗冻融耐久性的影响规律。试验结果表明:聚羧酸减水剂的掺入可以显著提高不同外掺料混凝土的力学性能、抗碳化性能和抗冻性能;在本文所考虑的减水剂掺量范围内,减水剂掺量为1.0%时,各组混凝土试样的抗压强度最高,抗碳化能力最强,抗冻融效果最好;采用幂函数形式得到的碳化深度随龄期的变化规律有较高的拟合精度和相关性,建立的函数关系可以很好的反映实际碳化试验结果;在聚羧酸高效减水剂掺量相同的情况下,随着粉煤灰用量的降低,矿粉掺量的逐渐增多,混凝土的抗碳化性能和抗冻性能得到明显改善。研究成果可为寒冷地区外掺料混凝土在冻融环境下的耐久性应用提供一定的试验依据和参考。
The effect of different content of fly ash(20%,30%,40%),slag and polycarboxylate superplasticizer(0,0.6%,0.8%,1.0%,1.2%)on the mechanical properties,durability of carbonation resistance and freezing-thawing resistance performance of hydraulic concrete in cold regions were investigated by using basic mechanical method.The results indict that the mechanical properties,carbonization and frost resistance of concrete with different admixture can be significantly improved through the addition of polycarboxylate superplasticizer.The dosage of polycarboxylate superplasticizer is 1.0%,which the compressive strength,carbonation and frost resistance durability of different concrete specimens are excellent.In this paper,the carbonation depth prediction models was obtained by power function form has high fitting accuracy and correlation based on the experimental results.With the increase of replacement ratio of fly ash,the content of slag increases gradually,the carbonation resistance and frost resistance of concrete are improved obviously under the same dosage of polycarboxylate superplasticizer.The results can serve as a reference and valuable data for maintenance,design and engineering practice of concrete structres under in cold regions subjected to cyclic freezing and thawing actions.
作者
张恺
尹志刚
程国敏
周晶
ZHANG Kai;YIN Zhi-gang;CHENG Guo-min;ZHOU Jing(School of Hydraulic Engineering,Dalian University of Technology,Dalian 116024,China;School of Hydraulic and Environmental Engineering,Changchun Institute of Technology,Changchun 130012,China;Zhongshan Water Conservancy and Hydropower Surveying,Designing and Consulting Co.,Ltd.,Zhongshan 528400,China)
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2018年第9期2974-2978,2984,共6页
Bulletin of the Chinese Ceramic Society
基金
水利部公益性行业科研专项(201201040)
关键词
聚羧酸减水剂
外掺料
混凝土
耐久性
polycarboxylate superplasticizer
admixture
concrete
durability
