结合国内某隧道工程的施工,通过原材料选择、混凝土配合比设计及性能检测,研制出了C40高保坍大体积混凝土。研究结果表明,采用保坍型聚羧酸盐高效减水剂,掺入25%Ⅰ级粉煤灰和8%膨胀剂配制的隧道C40混凝土具有良好的工作性能,较高的早期强度和抗氯离子渗透性能,特别是28d收缩率为1.52×10-4,有利于提高隧道混凝土的耐久性能。 Combined with the construction of a tunnel project in China, through the selection of raw materials, concrete mix design and performance testing, developed C40 high-volume large-volume slump concrete. The results show that the use of slump-type polycarboxylate superplasticizer, mixed with 25% I grade fly ash and 8% of the expansion agent prepared tunnel C40 concrete has good working performance, high early strength and resistance to chlorine Ion permeability, especially 28d shrinkage of 1.52 × 10-4, is conducive to improving the durability of tunnel concrete.