摘要
混凝土的孔隙性对其强度及耐久性都有很大的影响,混凝土孔隙的存在是无法避免的,但可以通过添加矿物掺合料等途径将孔隙尽量减少或控制在较低范围内,而提高混凝土的强度及耐久性等。本研究将3000,600,400目三种大理石粉作为矿物掺合料,用内掺法分别取代5%,10%,15%,20%,25%的水泥制备混凝土试件,测定了表观密度、孔隙率、毛细管系数和超声脉冲速率等混凝土孔隙性和密实性试验指标。试验结果表明:大理石粉掺入量在10%以内对混凝土的孔隙率影响不大,同时可以明显减小混凝土内毛细孔的含量;掺入量超过15%以后混凝土孔隙率和毛细孔量均大量增长;混凝土的孔隙率与毛细管系数之间存在线性关系,而混凝土的密实度与超声脉冲之间也存在明显的线性关系。
Porosity of concrete has a great impact on its strength and durability.The existence of concrete pore is inevitable,but it can be reduced or controlled in a lower range by adding mineral admixtures and other ways which can improve the strength and durability of concrete.Using 3000 mesh,600 mesh and 400 mesh marble powder as mineral admixtures,concrete specimens were prepared by internal mixing method instead of 5%,10%,15%,20%and 25%cement,respectively.The apparent density,porosity,capillary coefficient and ultrasonic pulse rate of concrete were measured.The experimental results show that the content of capillary pore in concrete decreases obviously when the content of marble powder is less than 10%.After the content of marble powder is more than 15%,the porosity and capillary pore of concrete increase greatly.There is a linear relationship between the porosity of concrete and the capillary coefficient,while the mixing of marble powder can reduce the content of capillary pore obviously.There is also an obvious linear relationship between the compactness of the soil and the ultrasonic pulse.
作者
张金团
李铿铭
胡琴
王痛快
张金丹
蔡德所
张怀阳
蒙茂贞
ZHANG Jintuan;LI Kengming;HU Qin;WANG Tongkuai;ZHANG Jindan;CAI Desuo;ZHANG Huaiyang;MENG Maozhen(School of Architecture and Engineering,Hezhou University,Hezhou,Guangxi 542899,China;School of Civil Engineering,Guangxi University,Nanning,Guangxi 530004,China;Guangxi Hezhou Guangsha Concrete Engineering Co.,Ltd.,Hezhou,Guangxi 542899,China)
出处
《施工技术》
CAS
2019年第S01期1462-1467,共6页
Construction Technology
关键词
混凝土
大理石粉
毛细吸水效应
孔隙率
密实度
concrete
marble powder
capillary water absorption effect
porosity
compactness
