摘要
通过冻融循环和毛细吸水试验,研究了冻融损伤和煤矸石陶粒取代率对混凝土毛细吸水性能的影响,并建立了考虑冻融损伤的煤矸石陶粒混凝土初始毛细吸水率预测模型。结果表明:煤矸石陶粒掺量对混凝土的吸水性具有明显影响,在冻融循环次数一定时,未掺煤矸石陶粒的混凝土吸水量最少,其次为煤矸石陶粒取代率为40%的混凝土。随着冻融次数的增加,煤矸石陶粒混凝土与普通混凝土的初始吸水率均增大,但二次吸水率变化趋势不同,煤矸石陶粒混凝土总体为先下降后趋于稳定,普通混凝土总体呈增加趋势。通过回归分析建立了考虑冻融损伤的煤矸石陶粒混凝土初始毛细吸水率预测模型,模型计算结果与实测结果符合较好。
Through freeze-thaw cycle and capillary water absorption test,the effects of freeze-thaw damage and coal gangue grained substitution on the capillary water absorption performance of concrete were studied,and the theoretical model of initial capillary water absorption of coal gangue ceramsite concrete considering freeze-thaw damage is established.The results show that the coal gangue ceramsite content has obvious influence on the water absorption of concrete.Under the condition of certain freeze-thaw cycle,the water absorption by concrete without coal gangue grains is the least,followed by concrete with 40%of coal gangue grains.With the increase of freeze-thaw times,the initial water absorption rate of gangue concrete and ordinary concrete is increasing,but the change trend of secondary water absorption is not exactly the same.Coal gangue ceramsite concrete generally declines first and then stabilizes,and the ordinary concrete generally tends to increase.Based on regression analysis,an initial capillary water absorption prediction model for gangue concrete is established,and the model results are in good agreement with the measured results.
作者
邱继生
郭鹏
关虓
王斌
张程华
QIU Jisheng;GUO Peng;GUAN Xiao;WANG Bin;ZHANG Chenghua(School of Architecture and Civil Engineering,Xi'an University of Science and Technology,Xi'an 710054,China)
出处
《新型建筑材料》
北大核心
2019年第12期32-36,46,共6页
New Building Materials
基金
国家自然科学青年科学基金项目(51808443)
陕西省自然科学基础研究计划面上项目(2018JM5167)
中国博士后科学基金项目(2017M613166)
关键词
煤矸石陶粒混凝土
毛细吸水性能
冻融损伤
预测模型
coal gangue ceramsite concrete
capillary water absorption performance
freeze-thaw damage
prediction model
