摘要
愈发多变的气候环境使泡沫混凝土的耐干湿循环能力面临着越来越严峻的考验,明确气孔结构特征的影响是提高耐干湿循环性的重要前提。采用双氧水发泡制备泡沫混凝土,测试其干湿质量损失率与干湿强度系数,统计测量各项孔结构特征,分析气孔量、几何特征以及级配与分布与耐干湿循环性的关系。结果表明:将中小孔与大孔的数量级配、中小孔平均孔径标准差分别控制在10倍与相应的范围内以及避免开口孔的出现,均有助于使泡沫混凝土获得最优的耐干湿循环能力。此外,尺寸形状适宜(平均孔径0.905 mm;平均圆度1.092)的大孔能够对泡沫混凝土强度在干湿循环中的损失起到抑制作用。
The increasingly changing climate forces the dry-wet resistance of foam concrete to face severe durability problems.Making clear the effect of air-void characteristic is a significant precondition of enhancing the dry-wet resisting ability of foam concrete.Mix hydro- gen peroxide forming method was adopted to prepare foam concrete specimens.Mass loss rate and strength coefficient was tested and each air-void characteristic was measured statistically.The relationship between the air-void characteristics, such as quantity, geometrical charac- teristic, grading and distribution, and dry-wet resistance of foam concrete was analyzed.The results showed that, it contributes to improving the dry-wet resistance to respectively control the amount ratio of non-big voids to big voids and standard deviation of average pore size within 10 times and the corresponding ranges.Besides, big voids formed in appropriate size and shape （average pore size of 0.905 ram, av- erage roundness of 1.092 ）had an inhibiting effect on the strength loss of the foam concrete during the dry-wet damage process.
出处
《混凝土》
CAS
CSCD
北大核心
2014年第11期38-43,共6页
Concrete
基金
国家科技部"十二五"科技支撑计划重大项目(2012BAJ20B03)
关键词
泡沫混凝土
双氧水
干湿循环
气孔特征
foam concrete
hydrogen peroxide
dry-wet resistance
air-void characteristic
