摘要
通过常温养护的方法制备了粉煤灰加气混凝土,研究了粉煤灰加气混凝土的制备工艺和力学性能。通过对碱激发剂、矿物掺合料等原料的配比调整,研究了粉煤灰含碳量、细度及用量对粉煤灰加气混凝土硬化时间、比强度的影响。在矿物掺合料总用量不变的情况下,采用膨胀珍珠岩及漂珠为轻质填料代替22%的粉煤灰进行加气混凝土制备试验。研究结果表明:随着粉煤灰含碳量的增加,加气混凝土的硬化时间延长,比抗压强度下降;粉煤灰颗粒越粗,加气混凝土硬化时间越长,比抗压强度越低;随着粉煤灰用量的增加,加气混凝土的比抗折强度先增加后降低,当粉煤灰分别占矿物掺合料用量的50%和100%时加气混凝土的比抗折强度出现2个极值点;填料膨胀珍珠岩及漂珠的加入,并不能降低加气混凝土的密度,但却能使加气混凝土的比抗折强度明显降低。
The preparation process and mechanical properties of a kind of fly ash aerated concrete cured at normal temperature were studied. By adjusting the ratio of alkali activator, mineral ad-mixture and other raw materials, this paper studied the effects of the carbon content, fineness and dosage of fly ash on setting time and specific strength of aerated concrete. With the amount of admixture unchanged, expanded perlite and floating beads were used instead of 22 % fly ash to prepare aerated concrete. The results show that setting time increases with the increase of carbon content of fly ash and the grain size while compressive specific strength of aerated concrete de- creases. With the increase of fly ash content, flexural specific strength of aerated concrete strength increases first and then decreases, and at the dosage of 50% and 100%, flexural specific strength reaches extreme point. Adding expanded perlite and floating beads, the density of aera-ted concrete will not be reduced but flexural specific strength will be reduced obviously. 4 tabs, 7 figs, 10 refs.
出处
《长安大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第4期35-39,共5页
Journal of Chang’an University(Natural Science Edition)
基金
陕西省'13115'重大科技专项项目(2010ZDKG-58)
中央高校基本科研业务费专项资金项目(CHD2010ZY015)
关键词
材料工程
粉煤灰
加气混凝土
硬化时间
比强度
materials engineering
fly ash
aerated concrete
setting time
specific strength
