一、引言碾压混凝土筑坝是七十年代初期在美、英、日等国发展起来的一种新技术。它采用通仓薄层浇筑、振动碾压实的方法施工,突破了传统坝工混凝土施工所用的柱状浇筑方法,因而大大简化以至取消温控措施。它的出现和推广是筑坝技术的一次革命。筑坝用碾压混凝土有三种主要类型:(1)干贫碾压混凝土:胶凝材料(水泥+粉煤灰)用量120公斤/米~3左右,其中粉煤灰含量为胶凝材料总重量的20～30％;(2)高 I. INTRODUCTION Rolling concrete dam construction is a new technology developed in the United States, Britain, Japan and other countries in the early 1970s. It adopts the method of thin-layer pouring and vibratory roller compaction. It has broken through the columnar pouring method used in the traditional concrete dam construction, thus greatly simplifying and eliminating the temperature control measures. Its emergence and promotion is a revolution in dam-building technology. There are three main types of roller compacted concrete for dam construction: (1) Dry lean RCC: The amount of cementitious material (cement + fly ash) is about 120 kg/m3, of which the fly ash content is the total weight of the cementitious material. 20 to 30%; (2) High