煤矸石陶粒轻集料混凝土体积稳定性研究

开展煤矸石陶粒替代普通碎石骨料制备轻集料混凝土的研究有助于推动建材向轻质、高强、隔热方向发展。在总结轻集料混凝土的研究和应用现状、体积收缩种类、收缩机理及其改善措施的基础上，研究了减缩剂、陶粒预湿对煤矸石陶粒轻集料混凝土体积稳定性的影响。试验结果表明：无论是增加减缩剂掺量还是提高煤矸石陶粒预湿程度，煤矸石陶粒轻集料混凝土试件的收缩率均明显下降、体积稳定性均明显改善；二者复合应用更有利于降低试件的收缩率、提高试件的稳定性。该研究对煤矸石陶粒轻集料混凝土的推广应用具有指导意义。

Study on Volume Stability of Coal Gangue Ceramsite Lightweight Aggregate Concrete

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.