摘要
在质量浓度为3.5%的NaCl溶液中,采用快冻法研究普通混凝土(OPC)、引气混凝土(APC)和高性能混凝土(HPC)试验梁和混凝土试件的抗盐冻性能。结果表明,采用混凝土试件的抗盐冻实验结果并不能准确反映钢筋混凝土构件的性能特点。OPC的盐冻破坏源于其表面剥蚀,引气能够显著提高其抗盐冻破坏能力,掺加40%FA将显著地降低APC的抗盐冻性能,掺加10%硅灰将使APC试验梁在盐冻过程中出现表面宏观裂纹。综合分析指出,FA掺量为20%的C50粉煤灰引气HPC结构具有较理想的抗盐冻能力。
The salt-freezing-resistance of ordinary Portland cement concrete （OPC）, air-entrained Portland cement concrete （APC） and high performance concrete （HPC） test beams and concrete specimens subjected to the action of 3.5% （in mass ） NaCI solution was studied by the accelerated freezing method. The results show that the salt-freezing-resistance of concrete specimen is not able to reflect the real performance characteristics of reinforced concrete member. The salt-freezing fracture of OPC is mainly due to the surface scaling of concrete. Its ability of resisting salt-freezing significantly improved by air-entrained con be sharply reduced by APC with 40% FA the salt-freezing process by APC concrete shows that the C50 air-entrained HPC stru resistance. damage can be crete, and the salt-freezing-resistance performances of APC can , and the APC test beam can appear macroscopic crack during with 10% silica fume. Therefore, the comprehensive analysis cture with 20% fly ash has the excellent ability of salt-freezing
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2010年第2期345-351,共7页
Bulletin of the Chinese Ceramic Society
基金
国家重点基础研究发展计划课题(2009CB623203)
江苏省自然科学基金前期预研项目(BK2005216)
中国博士后基金(20060400284)
南京航空航天大学博士生创新基金(BCXJ07-04)
关键词
高性能混凝土
引气混凝土
抗盐冻性能
冻融循环
相对动弹性模量
high performance concrete
air-entrained portland cement concrete
salt-freezing resistance
freezing and thawing cycles
relative dynamic elastic modulus
