摘要
本文基于显微硬度分析研究了粉煤灰混凝土的碳化性能。粉煤灰混凝土在加速碳化环境中碳化7 d和28 d后,将混凝土试样破型为50 mm的薄片后在新鲜断面上喷涂酚酞溶液测试混凝土碳化深度。从混凝土试样的边缘切取70 mm×50 mm×5 mm的切面进行抛光,以300μm为步长在切面上沿着碳化深度的方向测试显微硬度值。通过压汞试验分析碳化前后混凝土的孔结构变化。研究表明显微硬度分析是一种客观精确地研究混凝土碳化的方法,它从一个新的角度定量化研究加速碳化过程中混凝土内部微观孔结构的变化规律。
This paper presents the carbonation of fly ash concrete investigated with microhardness analysis.After fly ash concrete specimens are exposed in accelerated carbonation environment for 7 d and 28 d,the concrete plate about 50 mm thick is split from the specimen and the cross section is sprayed with phenolphthalein solution to measure carbonation depth.A slice about size of 70 mm×50 mm×5 mm is carefully cut from the edge of the specimen and polished with diamond polishing sandpaper.Microhardness values are tested along the carbonation direction of the slice as the step length of 300 μm.The pore structure changes caused by carbonation are explained by mercury intrusion porosimetry analysis.The results show that microhardness analysis is an objective and accurate method to investigate concrete carbonation.It reflects the change discipline of internal microstructure quantitatively in the accelerated carbonation process from a new perspective.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2011年第1期7-12,共6页
Bulletin of the Chinese Ceramic Society
基金
国家重点基础研究发展计划(2009CB623201)
国家自然科学基金(50802067)
关键词
粉煤灰混凝土
碳化
显微硬度分析
微观结构
fly ash concrete
carbonation
micro-hardness analysis
microstructure
