载荷对掺合料高强混凝土吸水性能的影响  

EFFECT OF MINERAL ADMIXTURES AND LOAD GRADE ON WATER ABSORPTION OF HIGH STRENGTH CONCRETE

作　　者：杨捷[1] 李兵[1] 张连英[1] 

机构地区：[1]徐州工程学院土木工程学院,江苏徐州221018

出　　处：《建筑技术》2017年第3期314-316,共3页Architecture Technology

基　　金：江苏省"333工程"科研项目(BRA2015065);住房和城乡建设部科技计划项目(2011-K6-15)

摘　　要：对经过0%σ_c,50%σ_c,65%σ_c,80%σ_c(压缩强度极限)4种载荷等级循环加载后的单掺粉煤灰、单掺矿粉和复合掺料混凝土进行吸水性试验研究。观察其表面吸水概貌,分析载荷等级对吸水高度和吸水率参数的影响。结果表明,当载荷小于50%σ_c时,孔隙结构发生弹性变形,微裂纹发展缓慢;当载荷在50%σ_c^65%σ_c范围内,混凝土试件中出现少数裂纹;当载荷大于65%σ_c时,混凝土试件中出现较多数贯穿裂纹;随着载荷等级增大,混凝土的吸水高度和吸水率明显增大,吸水高度h与t^(1/2)呈负指数关系。Tests for concrete with fly ash, concrete with slag, concrete with flash and slag after cyclic loading of four different load level which were 0%σc, 50%σc, 65%σc, 80%σc （σc is compressive strength limit） were conducted. The water absorption of surface was observed and the influence of load level on suction head and water absorption rate. The result showed that： When the load is smaller than 50%σc, pore structure produces elastic deformation and micro cracks develops slowly. When the load is between 50%σc and 65%σc, a few of cracks in concrete specimens appear. When the load is bigger 65%σc, most penetrating cracks appear. As the load level increased, the suction head, water absorption rate and porosity are increased significantly. Power exponent can describe the relation between suction head h and t^1/2.

关 键 词：载荷等级 矿物掺合料 吸水率 孔隙度 

分 类 号：TU528.58[建筑科学—建筑技术科学]