低吸湿泡沫混凝土的设计及物理性能
作者:
作者单位:

1.中交路桥建设有限公司,北京 101100;2.广东慧图资环科技发展有限公司,广东 广州 510510;3.华南农业大学 水利与土木工程学院,广东 广州 510642

作者简介:

杨 刚(1980—),男,湖北孝感人,中交路桥建设有限公司高级工程师,硕士.E-mail:371681108@qq.com

通讯作者:

李庚英(1970—),女,湖南邵东人,华南农业大学教授,博士生导师,博士.E-mail:ligengying@scau.edu.cn

中图分类号:

TU528.2

基金项目:

广东省普通高校重点领域专项及创新团队项目(2019KZDZX2001,2023KCXTD005);国家自然科学基金面上项目(52178209)


Design and Physical Properties of Foamed Concrete with Low Hygroscopicity
Author:
Affiliation:

1.Road & Bridge International Co., Ltd., Beijing 101100, China;2.Guangdong Huitu Resources and Environmental Technology Development Co., Ltd., Guangzhou 510510, China;3.College of Water Conservancy and Civil Engineering, South China Agricultural University, Guangzhou 510642,China

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    摘要:

    为了构筑低吸湿泡沫混凝土并再生利用热解污泥,以表观密度、导热系数和28 d抗压强度为指标,采用正交设计试验确定了热解污泥粉、甲基硅醇钠和纳米二氧化硅的合理掺量,进而研究了最优组合泡沫混凝土的物理性能. 结果表明:以表观密度和导热系数为衡量指标时,热解污泥粉、甲基硅醇钠和纳米二氧化硅的合理掺量分别为30%、1.5%、3.0%,而以28 d抗压强度为衡量指标时,三者的合理掺量分别为10%、0.5%、3.0%;1.5%的甲基硅醇钠使得泡沫混凝土的吸湿性降低了90.6%~95.5%;最优组合泡沫混凝土的导热系数、表观密度和强度满足FC5自保温泡沫混凝土的基本要求.

    Abstract:

    In order to construct the foamed concrete with low hygroscopicity meanwhile to recycle pyrolysis sludge ash(PSA) effectively, the reasonable dosage of PSA, sodium methyl-silanol(SMS) and nano-SiO2 was studied by using orthogonal design in which the apparent dry density, thermal conductivity and 28 d compressive strength were set as the measuring indicators. Then the physical properties of the foamed concrete with optimal proportion were investigated. The results show that, if setting the apparent dry density and thermal conductivity as the measuring indicators, the reasonable dosage of PSA, SMS and nano-SiO2 are 30%, 1.5% and 3.0%, respectively. If taking the 28 d compressive strength as the measuring indicator, the reasonable dosage of these three raw materials are 10%, 0.5% and 3.0% respectively. In addition, the results show the addition of 1.5% SMS reduces the hygroscopicity of the foamed concrete by 90.6%-95.5% as compared to the control one without SMS. The thermal conductivity, density and strength of the foamed concrete with optimal proportion meet the basic requirements of FC5 self-insulating blocks.

    表 2 正交试验方案Table 2 Scheme of orthogonal test
    表 3 正交试验结果Table 3 Orthogonal test results
    图1 导热系数、28 d抗压强度与表观密度的关系Fig.1 Relationship between thermal conductivity, 28 d compressive strength and apparent density
    图2 甲基硅醇钠的引气作用和憎水效果Fig.2 Entraining-air and hydrophobic effect of sodium methyl-silanolate
    图3 泡沫混凝土的干缩性Fig.3 Dry shrinkage performance of foamed concrete
    表 6 泡沫混凝土的吸湿性和热工特性Table 6 Hygroscopicity and thermal characteristics of foamed concrete
    表 1 水泥、热解污泥和纳米二氧化硅的化学组成Table 1 Chemical compositions(by mass) of cement, pyrolytic sludge and nano-SiO2Unit:%
    表 5 优组合及未掺甲基硅醇钠时泡沫混凝土的抗压和抗折强度Table 5 Compressive and flexural strength of foamed concretes with or without sodium methyl-silanolate
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引用本文

杨刚,吕彦松,曾广鸿,李晓梅,李庚英.低吸湿泡沫混凝土的设计及物理性能[J].建筑材料学报,2024,27(7):653-658

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  • 收稿日期:2023-09-19
  • 最后修改日期:2023-11-16
  • 在线发布日期: 2024-08-09
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