河道疏浚底泥制备泡沫混凝土试验研究-《混凝土与水泥制品》杂志社

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河道疏浚底泥制备泡沫混凝土试验研究

Experiment Study on Preparation of Foamed Concrete with Dredged River Sediment

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关键词：

疏浚底泥；泡沫混凝土；性能；微硅粉；生物炭

Key words：

Dredged river sediment; Foamed concrete; Property; Silica fume; Biochar

刊期：

2020年1期

DOI：

10.19761/j.1000-4637.2020.01.086.06

文章编号：

基金项目：

国家水体污染控制与治理科技重大专项资助课题（2017ZX07202005-005、2017ZX07204002-03）

作者：

杨小云1，赵玲1,2；陈兵3，仁增1，张颖2，李德平2，申哲民1

单位：

中机国际工程设计研究院有限责任公司，长沙 410000

摘要

摘要：利用河道疏浚底泥制备泡沫混凝土，研究了石灰、粉煤灰和微硅粉部分代替水泥，以及外掺偏硅酸钠、水玻璃和生物炭对所制备的底泥基泡沫混凝土抗压强度、导热系数和吸水耐水性能的影响。结果表明，微硅粉的加入优化了孔隙分布，可诱发火山灰反应，改善底泥基泡沫混凝土的综合性能；外掺2%的大麦草生物炭（500 ℃）可使底泥基泡沫混凝土的抗压强度提高14.2%，导热系数降低4.78%；添加石灰、粉煤灰和偏硅酸钠降低了泡沫混凝土的综合性能；水玻璃对泡沫混凝土的性能影响不大。

Abstract: Dredged sediment was used to produce foamed concrete, and the effects of partial replacement of cement by lime, fly ash and silica fume, and doping sodium metasilicate, water glass and biochar on the compressive strength, thermal conductivity and water absorption of the foamed concrete were studied. The results show that the addition of silica fume optimizes the pore distribution, induce the pozzolanic reaction, which can improve the comprehensive properties of the sediment foamed concrete. Dosage of 2% barley grass biochar (500 ℃) can increase the compressive strength of the sediment foamed concrete by 14.2% and reduce the thermal conductivity by 4.78%. The addition of lime, fly ash and sodium metasilicate reduce the comprehensive properties of foam concrete, and water glass has little effect on the properties of foam concrete.

结论

（1）底泥基泡沫混凝土的抗压强度随底泥掺量的增加而降低，且底泥本身的微孔结构使产品的保温隔热性能得到提升。当底泥掺量为50%，泡沫掺量为 54%时，可得到干密度为850 kg/m³、导热系数为0.236 8 W/（m·K）的符合国家标准的泡沫混凝土产品。

（2）微硅粉能够提高底泥基泡沫混凝土的抗压强度、耐水性和保温隔热性能，其孔隙填充作用可以缩小孔径分布，减少有害孔隙，使混凝土内部结构更均匀、致密。以5%微硅粉等质量取代水泥，可得到抗压强度为4.65 MPa，导热系数为0.202 2 W/（m·K），吸水率为29.6%的性能优良的产品。

（3）掺入2%的500 ℃条件下制备的具有集料填充效应和诱发二次水化反应能力的大麦草生物炭可改善混凝土综合性能，其中，耐水性能提高了33%。

（4）将底泥作为原料制备泡沫混凝土，不仅可以大量消纳底泥，同时能够制备出具有一定市场应用前景的商业建筑保温材料。

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引用本文

杨小云,赵玲,陈兵,等.河道疏浚底泥制备泡沫混凝土试验研究[J].混凝土与水泥制品,2020(1):86-91.

YANG X Y,ZHAO L,CHEN B,et al.Experiment Study on Preparation of Foamed Concrete with Dredged River Sediment[J].China Concrete and Cement Products,2020(1):86-91.

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