大型堆石混凝土试块特性对比试验研究

Comparative experimental investigation on the properties of large rock-filled concrete test blocks

堆石混凝土技术是基于自密实混凝土技术发展起来的一种新型大体积混凝土施工技术,其块石料源通常具有一定的不确定性,故对其进行现场试验是该技术成功应用的重要保证。本文论述了浯溪口水利枢纽工程中分别采用基础开挖岩石和当地鹅卵石作为堆石体浇筑大型堆石混凝土试块,并对其进行强度、渗透和碳化等特性试验和温升监测过程。通过试块的浇筑质量及抗压强度、渗透系数、弹性模量、碳化深度和内部温升等多项指标对比分析了两种堆石混凝土试块特性,并论证了将开挖岩石作为堆石混凝土堆石料的可行性。

Rock-filled concrete is a new technology for mass concrete that is developed on the basis of the self-compacting concrete.However,there exist certain uncertainties in the stone sources of rock-fill concrete.Pouring test in the engineering field to investigate the properties of large rock-filled concrete is an important prerequisite for the successful application of this technology,This paper aims to perform a comparative experimental investigation on the properties of large rock-filled concrete test blocks,which are poured by using excavated rocks and local collected pebbles at Wuxikou hydro-junction project site as rock-fills,respectively.The properties of large rock-filled concrete test blocks are studied and compared systematically through the concrete indexes,including compressive strength,permeability coefficient,elastic modulus and carbonization depth of the test block.The superiority and feasibility of taking excavated rocks as the stone sources of rock-fills are verified.