大掺量矿物掺合料混凝土抗盐冻性能研究  

Salt-Freezing Resistance of High-volume Mineral Admixture Concrete

作　　者：方鹏 李北星[1] 方晴 

机构地区：[1]武汉理工大学硅酸盐建筑材料国家重点实验室,武汉430070 [2]湖北省电力勘测设计院,武汉430040

出　　处：《硅酸盐通报》2018年第2期572-577,共6页Bulletin of the Chinese Ceramic Society

基　　金：国家电网公司2016年度依托工程基建新技术研究项目-第40分项目

摘　　要：开展了普通混凝土、复掺粉煤灰和矿粉的大掺量矿物掺和料混凝土(HVMAC)分别在清水、5% MgSO_4溶液、10% NaCl溶液、5%Na_2SO_4+5%MgCl_2复合溶液中的快速冻融试验,以试件的质量、动弹性模量及抗压强度变化表征混凝土在盐冻作用下的抗冻性能。结果表明,两种混凝土试件在清水中的冻融破坏比盐溶液中严重,普通混凝土在MgSO_4溶液中形成致密结构,破坏较小,在NaCl溶液中,HVMAC对溶液的吸收较小,其破坏程度较轻,混凝土在5%Na_2SO_4+5%MgCl_2复合溶液中几乎没有劣化,综合考虑,HVMAC的抗盐冻性最好。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% MgCI2 solution. In general, the freeze-thaw durability of HVMAC is best.

关 键 词：大掺量矿物掺合料 混凝土 盐冻 

分 类 号：TU528[建筑科学—建筑技术科学]