外加剂对泡沫混凝土孔结构及强度的影响

发布时间：2018-05-03 13:13

本文选题：泡沫混凝土 + 相对粘度　；参考：《新型建筑材料》2017年10期

【摘要】：以P·O42.5R水泥、植物蛋白发泡剂、电厂粉煤灰为原料,辅以聚羧酸减水剂、速凝剂、促凝剂,采用物理发泡法制备干密度为500 kg/m3的泡沫混凝土。使用流变仪、SEM、XRD对试样净浆性能、气孔结构及其分布进行表征,并研究外加剂对净浆的相对粘度和硬化泡沫混凝土的孔结构及强度的影响。结果表明:在配方中分别掺入0.2%速凝剂、0.3%促凝剂可使试样50~400μm的气孔比例分别达到93.67%和94.67%,气孔平均直径分别为182.90、149.86μm,28 d抗压强度分别达到3.20 MPa、3.31 MPa。掺减水剂(缓凝型)使泡沫混凝土气孔平均直径减小,但同时也增加开口孔隙率,掺入0.1%的减水剂样品的28 d抗压强度为2.88 MPa。
[Abstract]:The foam concrete with dry density of 500 kg/m3 was prepared by physical foaming method with P O 42.5R cement, plant protein foaming agent, power plant fly ash and polycarboxylic acid water reducer, accelerator and coagulant. The properties, pore structure and distribution of the sample were characterized by means of SEM XRD, and the effects of additives on the relative viscosity of the slurry and the pore structure and strength of hardened foam concrete were studied. The results showed that the porosity ratio of 50 渭 m was 93.67% and 94.67% respectively, and the mean diameter of pore was 182.90149.86 渭 m / 28 d compressive strength of 3.20 MPA ~ 3.31 MPa respectively by adding 0.2% accelerator 0.3% coagulant in the formula. The results showed that the porosity ratio of 50 ~ 400 渭 m was 93.67% and 94.67% respectively, and the mean pore diameter was 182.909.86 渭 m ~ (-1) ~ (-1). The average pore diameter of foam concrete was decreased by adding water reducer (retarding type), but the opening porosity was also increased. The 28d compressive strength of the sample mixed with 0.1% water reducer was 2.88 MPA.
【作者单位】：四川大学建筑与环境学院;四川建筑职业技术学院;成都大学建筑与土木工程学院;
【基金】：四川省科技计划项目(2015GZ0245) 教育部创新团队发展计划滚动支持项目(IRT14R37) 四川省2015年度博士后资助经费
【分类号】：TU37;TU528.2

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