煤矸石集料混凝土气渗和碳化性能实验研究  

Experiment Research on Gas Permeability and Carbonation Resistance of Coal Gangue Aggregates

作　　者：李永靖[1] 邢洋[1] 韩俊俊[1] 曹爽[1] 

机构地区：[1]辽宁工程技术大学土木与交通学院,辽宁阜新123000

出　　处：《非金属矿》2016年第1期17-20,共4页Non-Metallic Mines

基　　金：国家自然科学基金(51008148;51274111);辽宁省教育厅基金(L2013137)

摘　　要：利用自燃煤矸石代替碎石制作煤矸石混凝土试件进行气渗、碳化性能试验,并与碎石混凝土进行对比,研究了煤矸石混凝土气渗性能、碳化性能随龄期、水灰比和抗压强度变化规律。结果表明:煤矸石集料混凝土气渗系数随龄期增长而降低,且下降速度前期快、后期慢;在龄期一定条件下,气渗系数随水灰比增加而增大。在养护时间相同条件下,水灰比小于0.50时,碳化深度随水灰比增加而变小;水灰比大于0.50时,碳化深度随水灰比增加而变大;水灰比为0.50时,碳化深度最小,抗碳化能力最强;气渗系数、碳化深度均随抗压强度呈线性变化。试验表明:在合适的水灰比和合理的龄期条件下,煤矸石混凝土的气渗和碳化性能可以满足一般建筑结构要求,这为煤矸石混凝土的应用提供了试验依据。Making gangue concrete specimens with the spontaneous combustion gangue instead of gravel, the relationship between gas permeability and carbonation resistance with time and water cement ratio was studied. The results showed that the gas permeability of gangue concrete would decrease with the increase of curing period and drop faster early, late stabilized. The carbonation depth of gangue concrete would increases with time and comes to a steady state at 28 d. The carbonation depth decreases with the water-cement ratio when the water-cement ratio is small and reached the lowest at the water-cement ratio 0.50. Studies have shown that coal gangue concrete construction meet the general requirements in the gas barrier properties and carbonation performance, which provides the experimental basis for the application of gangue concrete.

关 键 词：煤矸石集料混凝土 气渗性能 碳化性能 水灰比 抗压强度 

分 类 号：TU528[建筑科学—建筑技术科学] TD849.5[矿业工程—煤矿开采]