关键词: 大掺量矿物掺合料;混凝土;盐冻

Abstract: Two types of concrete were designed:ordinary concrete,high-volume mineral admixture concrete(HVMAC)mixed with fly ash and ground granulated blast furnace slag.Specimens were treated with the method of accelerated freezing-thawing in fresh water,5％ MgSO4 solution,10％ NaCl solution,5％ Na2SO4 +5％ MgCl2 solution respectively.Then mass loss,dynamic elastic modulus and compressive strength of these specimens were measured to study the freeze-thaw durability of two types concrete.Results show that all specimens damage more seriously in fresh water than those in salt solution,ordinary concrete specimens suffer less in MgSO4 solution due to they form a dense structure.In NaCl solution,HVMAC absorbs less solution,so it damages less,all specimens have almost no degradation in 5％ Na2SO4 + 5％MgCl2 solution.In general,the freeze-thaw durability of HVMAC is best.

Key words: high-volume mineral admixture;concrete;salt-freezing