摘要
以非自燃煤矸石、粉煤灰和水泥等为原料制备了非自燃煤矸石混凝土,研究了水胶比、粉煤灰替代率对非自燃煤矸石混凝土坍落度和抗压强度的影响。结果表明,当水胶比为0.4、0.45和0.5时,随着粉煤灰替代率从0增加至20%时,非自燃煤矸石混凝土搅拌后的坍落度呈现逐渐增大的趋势;当粉煤灰替代率相同时,水胶比更大的非自燃煤矸石混凝土的坍落度也相对更大。当水胶比为0.4、0.45和0.5时,随着粉煤灰替代率从0增加至20%时,非自燃煤矸石混凝土在龄期为3 d、7 d和28 d时的抗压强度变化趋势基本相同,相同龄期下混凝土的抗压强度都会随着粉煤灰替代率增大而先增加后减小;水胶比为0.4、粉煤灰替代率为10%时,非自燃煤矸石混凝土28 d抗压强度取得最大值(21.88 MPa)。在相同粉煤灰替代率下,随着水胶比从0.4增加至0.5,非自燃煤矸石混凝土的28 d抗压强度整体呈现逐渐减小的特征,但是水胶比对抗压强度的影响较小,而对抗压强度影响的主要因素是粗骨料的强度。
The non spontaneous combustion gangue concrete was prepared with non spontaneous combustion gangue,fly ash and cement as raw materials,the effects of water binder ratio and fly ash replacement rate on the slump and compressive strength of non spontaneous combustion gangue concrete were investigated.The results show that when the water binder ratio is 0.4,0.45 and 0.5,the slump of the non spontaneous combustion gangue concrete increases gradually with the increase of the replacement ratio of fly ash from 0 to 20%;when the replacement ratio of fly ash is the same,the slump of the test piece with larger water binder ratio is also larger.When the water cement ratio is 0.4,0.45 and 0.5,and the replacement ratio of fly ash increases from 0 to 20%,the change trend of the compressive strength of the non spontaneous combustion gangue concrete at the age of 3 d,7 d and 28 d is basically the same,and the compressive strength of the specimens at the same age will increase first and then decrease with the increase of the replacement ratio of fly ash;when the water cement ratio is 0.4 and the replacement ratio of fly ash is 10%,the non spontaneous combustion gangue concrete will increase first and then decrease 28 d compressive strength obtained the maximum value(21.88 MPa).Under the same replacement rate of fly ash,with the increase of water binder ratio from 0.4 to 0.5,the 28 d compressive strength of non spontaneous combustion gangue concrete shows the characteristics of gradual reduction,but the water binder ratio has little influence on the compressive strength,and the main factor affecting the compressive strength is the strength of coarse aggregate.
作者
杨晓敏
贾兵
臧栋
剧兰梅
YANG Xiaomin;JIA Bing;ZANG Dong;JU Lanmei(Weifang Yidu Central Hospital,Qingzhou 262500,China;Jilin Normal University of Engineering and Technology,Changchun 130052,China)
出处
《粉煤灰综合利用》
CAS
2021年第4期94-97,140,共5页
Fly Ash Comprehensive Utilization
关键词
非自燃煤矸石
混凝土
粉煤灰
配合比
力学性能
non spontaneous combustion gangue
concrete
fly ash
mix proportion
mechanical properties
