摘要
为了得到和易性好、强度高的轻骨料混凝土,采用预处理法、掺加矿物掺合料等措施,制备高强轻骨料混凝土。试验根据矿物掺合料的特性,设计了碎石型轻骨料混凝土的配合比,对比了预处理骨料方法对混凝土和易性和强度的影响。试验结果表明:预处理骨料方法可以提高混凝土拌合物的和易性和抗压强度。配合比为水泥∶粉煤灰∶硅灰∶轻骨料∶砂∶水=300∶187.5∶75∶554∶540∶182,减水剂掺量0.85%,采用预处理法制备的碎石型轻骨料混凝土坍落度达270 mm,1 h经时损失量为0 mm,拌合物无离析、泌水、轻骨料无上浮现象,轻骨料混凝土干表观密度小于1 740 kg/m3,28 d抗压强度达到了52.6 MPa。
To obtain lightweight aggregate concrete with good workability and high strength, measures such as pre -treatment and mix- ing with mineral admixtures were applied to prepare high-strength lightweight aggregate concrete. According to characteristics of mineral admixture, the mix proportion of gravel-type lightweight aggregate concrete was designed and the effect of the pretreating aggregate method on workability and strength of concrete was compared in the test. Then, the measures optimized in formulation design and process were taken to prepare sphere-type high-strength lightweight aggregate concrete.The test results show that the pretreating aggre- gate method can improve the workability and compressive strength of concrete mixture. The mix proportion of cement, coal ash, silica fume,lightweight aggregate, sand and water is 350： 150： 50：530：577： 168. The dosage of water-reducing agent is 0.85%. The slump of gravel-type lightweight aggregate concrete prepared by pretreatment method reaches 270 mm.The loss amount after one hour is 0mm.No segregation or bleeding occurs in the mixture, and there is no flotation of lightweight aggregate. The dry apparent density of lightweight concrete is less than 1 740 kg/m3 ,and the 28d compressive strength reaches 52.6 MPa.
出处
《混凝土》
CAS
北大核心
2015年第2期132-135,共4页
Concrete
关键词
轻骨料
矿物掺合料
预处理法
抗压强度
和易性
lightweight aggregate
mineral admixtures
pre-treatment
compressive strength
workability
