碱激发泡沫混凝土干燥收缩影响因素及其抑制方法研究进展

孙浩洋; 张秀芝; 陶文宏; 闫孝伟; 侯杰; 郑沛祺; 丰曙霞; 杜鹏

doi:10.13801/j.cnki.fhclxb.20230817.001

碱激发泡沫混凝土干燥收缩影响因素及其抑制方法研究进展

doi: 10.13801/j.cnki.fhclxb.20230817.001

1.
济南大学　材料科学与工程学院，济南 250022
2.
山东正珩新材料科技有限责任公司，济南 250014
3.
济南大学　山东省建筑材料制备与测试技术重点实验室，济南 250022

基金项目: 国家自然科学基金(52178211)；济南市新高校20条(2021GXRC087)

详细信息

通讯作者:
张秀芝，博士，教授，博士生导师，研究方向为主要从事水泥基建筑材料、固废绿色建材化利用　E-mail: mse_zhangxz@ujn.edu

中图分类号: TU528.5；TB332
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出版历程
- 收稿日期: 2023-05-09
- 修回日期: 2023-07-20
- 录用日期: 2023-07-28
- 网络出版日期: 2023-08-18
- 刊出日期: 2024-02-01

Research progress on influencing factors and control methods of drying shrinkage of alkali-activated foam concrete

1.
School of Materials Science and Engineering, Jinan University, Jinan 250022, China
2.
Shandong Zhengheng New Material Technology CO., LTD., Jinan 250014, China
3.
Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, Jinan University, Jinan 250022, China

Funds: National Natural Science Foundation of China (52178211); New Universitys 20' Foundation of Jinan (2021GXRC087)

摘要

摘要: 碱激发泡沫混凝土是结合碱激发材料和泡沫混凝土性能优势发展的一种绿色低碳节能材料。与普通硅酸盐水泥水化产物和孔隙分布的差异使碱激发材料具有高收缩的缺点，限制了其应用和发展。本综述分析了毛细管张力理论、表面张力理论、分离压力理论和层间水迁移理论4种干燥收缩机制和影响因素，对比了碱激发泡沫混凝土与水泥基材料、碱激发材料收缩机制的异同。同时，总结了碱激发泡沫混凝土抑制收缩的最新研究进展。碱激发材料相较于水泥基材料干燥收缩更大的原因是水化产物的不同，碱激发泡沫混凝土的干燥收缩最主要与泡沫量有关，浆体越少干燥收缩值越小。最后，指出了碱激发泡沫混凝土未来发展和研究方向，为其绿色低碳化发展提供一有效途径。
- 碱激发泡沫混凝土 /
- 干燥收缩 /
- 孔结构 /
- 抑制方法 /
- 收缩机制
Abstract: Alkali-activated foam concrete is a type of green, low-carbon and energy-saving material which combines the advantages of alkali-activated materials and foam concrete. The application and development of alkali-activated foam concrete are limited by its complex drying shrinkage values which affected by its complicated pores structure and hydration products that unlike cement. In this review, the capillary tension theory, the surface tension theory, the separation pressure theory and the interlayer water transfer theory were analyzed. Contrast the similarities and differences of contraction mechanism between alkali-activated foam concrete, cement base material and alkali-activated material. Meanwhile, the latest research progress of inhibiting drying shrinkage of alkali-activated foam concrete is summarized. Compared with cement-based materials, alkali-activated materials have larger drying shrinkage because of the different hydration products. The drying shrinkage of alkali-activated foam concrete is mainly related to the amount of foam, and the less slurry, the smaller the drying shrinkage value. Finally, this review points out the research and application of alkali-activated foam concrete and provides an effective way for its development economically and environmentally.
- alkali-activated foam concrete /
- drying shrinkage /
- pore structure /
- control methods /
- contraction mechanism

HTML全文

图 1 碱激发泡沫混凝土干燥收缩机制图示：(a)毛细管力；(b)表面自由能；(c)分离压力；(d)层间水运动^[12]

Figure 1. Diagram of alkali-activated foam concrete drying mechanism: (a) Capillary force; (b) Surface free energy; (c) Separation pressure; (d) Interlayer water movement^[12]

下载: 全尺寸图片幻灯片

图 2 凝胶结构模型^[21]

C-A-S-H—Hydrated calcium aluminosilicate; N-A-S-H—Sodium hydrosilicate aluminate

Figure 2. Gel structure model^[21]

下载: 全尺寸图片幻灯片

图 3 碱激发反应过程^[24]

Figure 3. Alkali activated reaction process^[24]

下载: 全尺寸图片幻灯片

图 4 普通硅酸盐水泥(OPC)和碱激发矿渣(AAS)的干燥收缩与孔径关系(水胶比w/b=0.5)^[33]

Figure 4. Relationship between drying shrinkage and pore size of ordinary portland cement (OPC) and alkali-activated slag (AAS) (Water-binder ratio w/b= 0.5)^[33]

下载: 全尺寸图片幻灯片

图 5 水泥-砂基体10%~50%泡沫掺量的干燥收缩^[42]

FV—Foam volume

Figure 5. Drying shrinkage of cement-sand matrix with 10%-50% foam content^[42]

下载: 全尺寸图片幻灯片

图 6 碱激发矿渣砂浆：(a) 孔径分布；(b) 水玻璃模数；(c) 碱当量对干燥收缩的影响^[61]

PC—Portland cement; M_S—Sodium silicate modules

Figure 6. Alkali-activated slag mortar: (a) Pore size distribution;(b) Influence of sodium silicate modulus; (c) Alkali equivalent on drying shrinkage^[61]

下载: 全尺寸图片幻灯片

图 7 不同活性的氧化镁掺量对碱激发矿渣干燥收缩的影响^[72]

MgO_H—Highly active nano MgO; MgO_M—Moderately active nano MgO

Figure 7. Effect of MgO content with different activity on drying shrinkage of alkali activated slag^[72]

下载: 全尺寸图片幻灯片

表 1 纤维种类及掺量对泡沫混凝土干燥收缩的影响

Table 1. Effect of fiber type and content on drying shrinkage of alkali-activated foam concrete

Type of fibers	Fibre density/ (g·cm^–3)	Fibre length/ mm	Fibre diameter/ μm	Foamed concrete dry density/(g·cm^–3)	Cementitious materials	Type of shrinkage	Fiber content	Effect of shrinkage- reducing/%
PP^[86]	—	6	—	Foam/cementitious materials=0.2-0.8	Slag, fly ash	Drying	1.4vol%	90 d reduced 40
PVA^[87]	1.3	12	40	350	Slag	Drying	0.6 kg/m³	28 d reduced 16.3
PVA^[88]	1.3	12	15	700-800	P·O 42.5, fly ash	Total	0.15vol%	28 dreduced 32
PP^[89]	—	6	18	540-580	Slag	Drying	0.6wt%	56 d reduced 12.29
Notes: PVA—Polyvinyl alcohol; PP—Polypropylene.

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