中南大学学报（自然科学版）2012，Vol.43Issue(8)：3180-3186,7.
无砟轨道的道床板混凝土抗干缩开裂性能
Drying shrinkage-induced cracking resistance of non-ballast track slab concrete
摘要
Abstract
The shrinkage-induced cracking resistance of C30 concretes with different mix proportions was studied using the ring with notch designed to replace the traditional ring in the concrete ring test. The results show that fly ash and expansive agent have little influence on the shrinkage-induced cracking resistance of concrete under the condition of 20℃ and relative humidity of 55%-65% The addition of 15% fly ash has negative effect on the shrinkage-induced cracking resistance of concrete, but the addition of 30% fly ash or 5%-l0% expansive agent is beneficial to the shrinkage-induced cracking resistance of concrete under the condition of 30 ℃ and relative humidity of 34%-40%. Under the condition of 40 ℃ and relative humidity of 20%-25%, the shrinkage-induced cracking resistance of concrete decreases with the increase of adding amount of fly ash; adding proper amount of expansive agent improves the shrinkage-induced cracking resistance of concrete. However, adding excessive amount of expansive agent is harmful to it.关键词
道床板/干燥收缩/混凝土/抗裂性能/环试验Key words
stab/drying shrinkage/concrete/cracking resistance/ring test分类
建筑与水利引用本文复制引用
周小菲,王强,阎培渝..无砟轨道的道床板混凝土抗干缩开裂性能[J].中南大学学报（自然科学版）,2012,43(8):3180-3186,7.基金项目
铁道部科技研究开发计划重大项目(2008G031-18-6) （2008G031-18-6）
国家“十五”科技支撑计划项目(2008BAE61B05-02) （2008BAE61B05-02）
