关键词: 煤矸石陶粒, 轻集料混凝土, 体积稳定性, 减缩剂, 预湿, 收缩率

Abstract: Investigation that lightweight aggregate concrete with coal gangue ceramsite replace ordinary gravel is helpful for development direction of building materials to light quality，high strength，heat insulation.Based on the summary of present research and application status，volume shrink type，shrinkage mechanism，and the improvement measures on lightweight aggregate concrete，the influences of shrinkage reducing agent，ceramsite pre-wetting degree on volume stability of coal gangue ceramsite lightweight aggregate concrete were studied.The results indicated that no matter increase the shrinkage reducing agent dosage or improve the pre-wetting degree on coal gangue ceramsite lightweight aggregate concrete，the shrinkage rate were significantly decreased，and the volume stability were improved obviously.The composite application of the two is more conducive to reducing shrinkage rate，improving the volume stability of the specimen.The research results have guiding significance to the application of coal gangue ceramsite lightweight aggregate concrete.

Key words: Coal gangue ceramsite, Lightweight aggregate, Volume stability, Shrinkage reducing agent, Pre-wetting, Shrinkage rate