Preparation and Properties of Lightweight High-Strength Autoclaved Aerated Concrete

Abstract

Abstract: In this paper, the preparation technology of lightweight high-strength autoclaved aerated concrete was studied by using typical solid waste resources such as fly ash and micro silica powder in Xinjiang. The effects of raw material ratio, water to material ratio and gas-generating agent content on the absolute dry density and compressive strength of products were analyzed.The results show that when m (fly ash)∶m(micro silica powder)∶m(quartz sand)∶m(quicklime)∶m(cement)∶m(gypsum) is 30∶25∶10∶25∶8∶2, the amount of aluminum powder is 0.10% of total material mass, the water to material ratio is 0.58, the autoclave temperature is 195 ℃, the autoclave pressure is 1.2 MPa, and the autoclave time is 8 h, the absolute dry density of lightweight high-strength autoclaved aerated concrete is 568.70 kg/m³, the compressive strength is 5.4 MPa, and the thermal conductivity is 0.140 W/(m·K), reaching the level of A5.0, B06.

Key words: autoclaved aerated concrete, fly ash, micro silica powder, dry density, compressive strength, gas-generating agent

CLC Number:

TU528.2

LI Xiangguo, WEI Wu, HE Chao, CAI Lixiong, LYU Yang, DAN Jianming. Preparation and Properties of Lightweight High-Strength Autoclaved Aerated Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(7): 2427-2433.

References

[1] 张祥成, 孟永彪. 浅析中国粉煤灰的综合利用现状[J]. 无机盐工业, 2020, 52(2): 1-5.
ZHANG X C, MENG Y B. Brief analysis on present situation of comprehensive utilization of fly ash in China[J]. Inorganic Chemicals Industry, 2020, 52(2): 1-5 (in Chinese).
[2] 柴磊, 岳天, 严志桦, 等. 粉煤灰资源化利用研究进展[J]. 中国资源综合利用, 2023, 41(2): 93-98.
CHAI L, YUE T, YAN Z H, et al. Research progress on resource utilization of fly ash[J]. China Resources Comprehensive Utilization, 2023, 41(2): 93-98 (in Chinese).
[3] 王杰, 魏奎先, 马文会, 等. 工业微硅粉应用及提纯研究进展[J]. 材料导报, 2020, 34(23): 23081-23087.
WANG J, WEI K X, MA W H, et al. Research progress in purification and application of industrial silica fume[J]. Materials Reports, 2020, 34(23): 23081-23087 (in Chinese).
[4] 张金梁, 卢萍, 杨桂生, 等. 微硅粉性能表征与综合利用研究现状分析[J]. 矿冶, 2020, 29(4): 116-122.
ZHANG J L, LU P, YANG G S, et al. Properties characterization and comprehensive utilization status analysis of silica fume[J]. Mining and Metallurgy, 2020, 29(4): 116-122 (in Chinese).
[5] 陈潇, 张浩宇, 薛鑫, 等. 固体废弃物在蒸压加气混凝土中的应用现状综述[J]. 硅酸盐通报, 2023, 42(2): 541-553.
CHEN X, ZHANG H Y, XUE X, et al. Review on application of solid wastes in autoclaved aerated concrete[J]. Bulletin of the Chinese Ceramic Society, 2023, 42(2): 541-553 (in Chinese).
[6] 蔡星, 奚新国, 吕洪杰, 等. 钙硅比对生物质灰渣加气混凝土性能的影响[J]. 硅酸盐通报, 2018, 37(3): 800-804.
CAI X, XI X G, LYU H J, et al. Influence of calcium-silicon ratio on performance of biomass ash aerated concrete[J]. Bulletin of the Chinese Ceramic Society, 2018, 37(3): 800-804 (in Chinese).
[7] 欧天安, 黎宇平, 潘荣伟. 生石灰消化性能对大掺量CFB固硫灰蒸压加气混凝土性能影响研究[J]. 新型建筑材料, 2022, 49(4): 98-103.
OU T A, LI Y P, PAN R W. Research on the effect of quick lime on the performance of CFB sulfur cement ash autoclaved aerated concrete[J]. New Building Materials, 2022, 49(4): 98-103 (in Chinese).
[8] 龚威, 丁向群, 冀言亮, 等. 蒸养制度对铁尾矿加气混凝土强度的影响[J]. 硅酸盐通报, 2014, 33(1): 43-47.
GONG W, DING X Q, JI Y L, et al. Effect of steam curing system on properties of aerated concrete made of iron tailings[J]. Bulletin of the Chinese Ceramic Society, 2014, 33(1): 43-47 (in Chinese).
[9] 陈胜利. 加气混凝土的生产及应用[J]. 砖瓦, 2007(7): 50-52.
CHEN S L. Use of aerated concrete and production technology[J]. Block-Brick-Tile, 2007(7): 50-52 (in Chinese).
[10] BONAKDAR A, BABBITT F, MOBASHER B. Physical and mechanical characterization of fiber-reinforced aerated concrete (FRAC)[J]. Cement and Concrete Composites, 2013, 38: 82-91.
[11] JIANG J, MA B, CAI Q, et al. Utilization of ZSM-5 waste for the preparation of autoclaved aerated concrete (AAC): mechanical properties and reaction products[J]. Construction and Building Materials, 2021, 297: 123821.
[12] CHEN Y, CHANG J, LAI Y, et al. A comprehensive study on the production of autoclaved aerated concrete: effects of silica-lime-cement composition and autoclaving conditions[J]. Construction and Building Materials, 2017, 153: 622-629.
[13] SONG Y M, LI B L, YANG E H, et al. Feasibility study on utilization of municipal solid waste incineration bottom ash as aerating agent for the production of autoclaved aerated concrete[J]. Cement and Concrete Composites, 2015, 56: 51-58.
[14] LI X G, LIU Z L, LV Y, et al. Utilization of municipal solid waste incineration bottom ash in autoclaved aerated concrete[J]. Construction and Building Materials, 2018, 178: 175-182.
[15] CONG X Y, LU S, YAO Y, et al. Fabrication and characterization of self-ignition coal gangue autoclaved aerated concrete[J]. Materials & Design, 2016, 97: 155-162.
[16] MA B G, CAI L X, LI X G, et al. Utilization of iron tailings as substitute in autoclaved aerated concrete: physico-mechanical and microstructure of hydration products[J]. Journal of Cleaner Production, 2016, 127: 162-171.
[17] 黄利祥, 刘泽, 原航, 等. 赤泥-石膏复合激发蒸压加气混凝土的制备与性能研究[J]. 硅酸盐通报, 2023, 42(4): 1393-1399+1427.
HUANG L X, LIU Z, YUAN H, et al. Preparation and properties of autoclaved aerated concrete with red mud-gypsum composite excitation[J]. Bulletin of the Chinese Ceramic Society, 2023, 42(4): 1393-1399+1427 (in Chinese).
[18] 房天齐, 黄舒, 乔秀臣. 循环流化床灰蒸压加气混凝土中延迟形成钙矾石的研究[J]. 硅酸盐通报, 2023, 42(7): 2439-2446.
FANG T Q, HUANG S, QIAO X C. Delayed formation of ettringite in autoclaved aerated concrete with circulating fluidized bed fly ash[J]. Bulletin of the Chinese Ceramic Society, 2023, 42(7): 2439-2446 (in Chinese).
[19] 张宪圆, 林克辉, 谢红波. 硅灰对蒸压加气混凝土性能影响的研究[J]. 新型建筑材料, 2016, 43(10): 53-55.
ZHANG X Y, LIN K H, XIE H B. The study on the influence of silica fume to autoclaved aerated concrete properties[J]. New Building Materials, 2016, 43(10): 53-55 (in Chinese).
[20] 马保国, 蔡礼雄, 蹇守卫, 等. 生石灰掺量对轻质蒸压加气混凝土性能及水化产物的影响[J]. 新型建筑材料, 2014, 41(8): 1-4.
MA B G, CAI L X, JIAN S W, et al. Influence of quicklime dosage on lightweight autoclaved aerated concrete property and hydration products[J]. New Building Materials, 2014, 41(8): 1-4 (in Chinese).
[21] 彭军芝, 彭小芹. 加气混凝土的结构与性能研究进展[J]. 材料导报, 2011, 25(1): 89-93.
PENG J Z, PENG X Q. A review on structure and properties of aerated concrete[J]. Materials Reports, 2011, 25(1): 89-93 (in Chinese).