摘要
通过拌合物和易性、混凝土基体抗压强度和平板开裂测试,研究粉煤灰和矿粉两种火山灰掺合料对混凝土力学与耐久性影响。结果表明:随着矿粉加量的升高,拌合物和易性逐渐变差,但是加入粉煤灰后和易性变化不大。加入火山灰掺合料混凝土7 d强度较纯水泥混凝土低,但28 d强度明显升高,这是由于早期火山灰反应不够,随着养护时间的延长,加入粉煤灰的试样水化度明显升高。体积收缩实验表明,加入矿粉后开裂程度增大,与平板实验矿粉开裂增大结果一致。
The concrete with fly ash and mineral powder was investigated. The effect of recycled admixtures on the mechanical properties and durability of concrete were analyzed based on the workability, the compressive strength and slab cracking test. The results show that the workability gradually becomes worse as the mineral powder amount increases. However, the workability basically unchanges after adding fly ash. The 7-d compressive strength of concrete with recycled admixtures is lower than that of pure cement concrete, and the 28-d compressive strength is significantly elevated. The volcanic reaction is insufficient in early stage. However, the hydration degree of the sample with fly ash can be improved due to the extension of curing time. The volumetric shrinkage experiment shows that the sample cracking degree is increased after adding mineral powder, which is consistent with the results of slab cracking tests.
作者
时宇
朱金华
和德亮
罗小东
吴涛
杜生平
SHI Yu;ZHU Jinhua;HE Deliang;LUO Xiaodong;WU Tao;DU Shengping(Chengdu High-tech Enterprise Technology Center,Chengdu Seller Concrete Co.Ltd of Chengdu Construction Engineering Group,Chengdu 610500,China)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2019年第11期1605-1610,共6页
Journal of The Chinese Ceramic Society
基金
成都建工集团课题(CDJG-20190048)
关键词
火山灰掺合料
混凝土
力学性能
开裂机理
volcanic admixture
concrete
mechanical properties
cracking mechanism