Influence of Coal Gangue Aggregate Grading on Strength Properties of Concrete  

作　　者：WANG Zhenshuang ZHAO Ning 

机构地区：[1]Investment Engineering College, Dongbei University of Finance and Economics [2]Financial School, Dongbei University of Finance and Economics

出　　处：《Wuhan University Journal of Natural Sciences》2015年第1期66-72,共7页武汉大学学报（自然科学英文版）

基　　金：Supported by the National Natural Science Foundation of China(U126112,11226250);China Postdoctoral Science Foundation(2013M541236)

摘　　要：This paper investigates the feasibility of using coal gangue as coarse and fine aggregates in concrete as well as how the coal gangue aggregate grading affects concrete properties. Nine mixed concrete samples were prepared with the value n in Fuller＇s curve ranged from 0.44 to 0.68. The coal gangue aggregate with n = 0.62 shows the highest density, water absorption, cylinder strength and the lowest voids. The results indicate that using coal gangue as coarse and fine aggregate in concrete is tech- nically feasible and useful. When n is 0.62, the values of the slump, 28-day compressive, splitting tensile strength, flexural strength and elasticity modulus of coal gangue concrete reach the highest. The highest 7-day and 28-day compressive strength were 24 MPa and 37 MPa in mix CG7, respectively. It is possible to produce grade 30 coal gangue concrete with coal gangue coarse and fine aggregate.This paper investigates the feasibility of using coal gangue as coarse and fine aggregates in concrete as well as how the coal gangue aggregate grading affects concrete properties. Nine mixed concrete samples were prepared with the value n in Fuller＇s curve ranged from 0.44 to 0.68. The coal gangue aggregate with n = 0.62 shows the highest density, water absorption, cylinder strength and the lowest voids. The results indicate that using coal gangue as coarse and fine aggregate in concrete is tech- nically feasible and useful. When n is 0.62, the values of the slump, 28-day compressive, splitting tensile strength, flexural strength and elasticity modulus of coal gangue concrete reach the highest. The highest 7-day and 28-day compressive strength were 24 MPa and 37 MPa in mix CG7, respectively. It is possible to produce grade 30 coal gangue concrete with coal gangue coarse and fine aggregate.

关 键 词：coal gangue aggregate Fuller’s curve WORKABILITY STRENGTH modulus of elasticity GRADING 

分 类 号：TU528[建筑科学—建筑技术科学]