粉煤灰漂珠增强泡沫混凝土性能试验研究

关键字：泡沫混凝土,粉煤灰漂珠,气孔分布,抗压强度,导热

（1.四川大学 建筑与环境学院，四川 成都  610064；2.四川建筑职业技术学院，四川 德阳  618000；3.成都大学 建筑与土木工程学院，四川 成都  610106）

    摘要：利用工业废弃物粉煤灰中的漂珠（FACs）、P·O42.5R水泥、植物蛋白发泡剂和电厂粉煤灰为原料，采用物理发泡法制备500 kg/m3的泡沫混凝土。运用流变仪、SEM、XRD等测试方法及图像分析软件对试样气孔结构及分布进行表征，并探讨了FACs对浆体工作性、泡沫混凝土的强度及导热系数的影响。结果表明：掺2.8%FACs时的泡沫混凝土试样小于400 μm孔的气孔比例为94.94%，气孔平均直径为174.39 μm，28 d抗压强度达到3.38 MPa，导热系数为0.1117 W/（m·K）；过量的FACs（>2.8%）会使硬化泡沫混凝土小于50 μm的气孔增加，并增加开口孔隙率；掺3.5%FACs的泡沫混凝土试样28 d抗压强度为2.87 MPa，导热系数为0.1079 W/（m·K）。
    关键词：泡沫混凝土；粉煤灰漂珠；气孔分布；抗压强度；导热系数
    中图分类号：TU528.2        文献标识码：A        文章编号：1001-702X（2017）03-0076-05
 

Research on properties of foamed concrete reinforced with fly ash cenospheres
HU Chi1，2，LI Hui2，LIU Zhongwei2，WANG Qingyuan1，3
（1.College of Architecture & Environment，Sichuan University，Chengdu 610064，China；2.Sichuan College of Architectural Technology，Deyang 618000，China；3.School of Architecture and Civil Engineering，Chengdu University，Chengdu 610106，China）

    Abstract：Foamed concrete（500 kg/m3） was prepared through a physical foaming method using fly ash cenospheres（FACs） recovered from industrial waste，ordinary Portland cement 42.5R，vegetable protein agent and fly ash as raw materials. The performance of cement paste structure as well as distribution of air voids were characterized by rheometer，SEM，XRD analyses with image software. The effect of FACs on the working capability of cement paste，compressive strength and thermal conductivity of the foamed concrete sample were also explored. Results show that the foamed concrete mixed 2.8% of FACs could make the porosity ratio of pore distributed in less than 400 μm reached 94.94%，the average pore diameter was 174.39 μm，28 d compressive strength reached 3.38 MPa，the thermal conductivity was 0.1117 W/（m·K）. The samples mixed with excess FACs（>2.8%） increased the porosity ratio of pore（＜50 μm） and the open porosity，the compressive strength of foamed concrete mixed 3.5% FACs at 28 d was 2.87 MPa and the thermal conductivity was 0.1079 W/（m·K）.
    Key words：foamed concrete，fly ash cenospheres，distribution of air-void，compressive strength，thermal conductivity