Effects of Rheological Properties of Foamed Slurry on Homogeneity of Lightweight Concrete

Abstract

Abstract: In order to improve the homogeneity of lightweight concrete and enhance the mechanical properties of lightweight concrete, the Herschel-Bulkley (H-B) plastic viscosity calculation model was established to explore the influences of rheological characteristics of foamed slurry on the foam settlement and ceramsite distribution in slurry. The results show that with the increase of thickener content, the yield stress and the plastic viscosity of lightweight concrete foamed slurry based on nonlinear H-B model η_H-B=0.016 67K(80ⁿ-20ⁿ) (η_H-B is the plastic viscosity of foamed slurry obtained by H-B calculation model; K is consistency coefficient; n is flow index) increase. As a result, the settlement distance of foamed slurry decreases and the fractal dimension of ceramsite in slurry increases. When the plastic viscosity of foamed slurry is greater than 1.74 Pa·s and the yield stress is greater than 92.87 Pa, the lightweight concrete with compressive strength greater than 10 MPa is prepared. It is seen that optimizing the rheological properties of the foamed slurry is the key to overcome the easy floating problem of ceramsite in foamed slurry, which can effectively improve the homogeneity of lightweight concrete and enhance the mechanical properties of lightweight concrete.

Key words: lightweight concrete, rheological property, foam settlement, ceramsite, fractal dimension, strength

CLC Number:

TU528.2

PAN Zhenghua, JIANG Yaqing, ZHAO Wenhao. Effects of Rheological Properties of Foamed Slurry on Homogeneity of Lightweight Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(2): 471-477.

References

[1] 陈志纯, 李应权, 扈士凯, 等. 我国聚苯乙烯颗粒泡沫混凝土发展现状[J]. 混凝土世界, 2018(4): 26-28.
CHEN Z C, LI Y Q, HU S K, et al. Development status of polystyrene particle foam concrete in China[J]. China Concrete, 2018(4): 26-28 (in Chinese).
[2] 李辛庚, 闫风洁, 岳雪涛, 等. 陶粒混凝土的研究进展[J]. 硅酸盐通报, 2020, 39(11): 3407-3418+3452.
LI X G, YAN F J, YUE X T, et al. Research progress on ceramsite concrete[J]. Bulletin of the Chinese Ceramic Society, 2020, 39(11): 3407-3418+3452 (in Chinese).
[3] 陈松和. 泡沫混凝土体积稳定性及力学性能研究[D]. 南京: 南京航空航天大学, 2016.
CHEN S H. Study on volume stability and mechanical properties of foam concrete[D]. Nanjing: Nanjing University of Aeronautics and Astronautics, 2016 (in Chinese).
[4] 秦程. 陶粒泡沫混凝土的制备与性能研究[D]. 重庆: 重庆大学, 2018.
QIN C. Study on the preparation and properties of ceramsite foam concrete[D]. Chongqing: Chongqing University, 2018 (in Chinese).
[5] 陈迪森. 搅拌工艺对多孔类骨料混凝土性能的影响[D]. 南宁: 广西大学, 2017.
CHEN D S. Effect of different mixing methods on performance of porous aggregate concrete[D]. Nanning: Guangxi University, 2017 (in Chinese).
[6] 李晋禹, 翁鹤森, 王哲, 等. 滨海软土区泡沫混凝土路基施工技术与沉降控制研究[J]. 路基工程, 2021(1): 127-131.
LI J Y, WENG H S, WANG Z, et al. Research on construction technology and settlement control of foam concrete subgrade in coastal soft soil area[J]. Subgrade Engineering, 2021(1): 127-131 (in Chinese).
[7] 周涛涛. 超细粉体对泡沫混凝土性能的影响研究[D]. 重庆: 重庆大学, 2020.
ZHOU T T. Study on the influence of ultrafine powder on the performance of foam concrete[D]. Chongqing: Chongqing University, 2020 (in Chinese).
[8] 景帅帅. 铁尾矿粉泡沫混凝土特性研究[D]. 西安: 长安大学, 2014.
JING S S. Characteristics and properties of foam concrete with iron ore tailings[D]. Xi'an: Chang'an University, 2014 (in Chinese).
[9] 周翔. 纤维素醚基稳泡剂对泡沫混凝土性能影响的研究[J]. 福建建设科技, 2018(3): 1-3+49.
ZHOU X. Investigation of effect of cellulose ether based foam stabilizer on properties of foamed concrete[J]. Fujian Construction Science & Technology, 2018(3): 1-3+49 (in Chinese).
[10] 詹镇峰, 李从波, 甘伟. 大流动度陶粒混凝土的配制与应用[J]. 混凝土, 2012(6): 114-116.
ZHAN Z F, LI C B, GAN W. Preparation and application of high fluidity ceramsite concrete[J]. Concrete, 2012(6): 114-116 (in Chinese).
[11] 张郁. 铁尾矿陶粒轻质混凝土早期变形及其对物理力学性能的影响研究[D]. 西安: 长安大学, 2021.
ZHANG Y. Study on early deformation of iron ore tailings ceramsite lightweight concrete and its effect on physical and mechanical properties[D]. Xi'an: Chang'an University, 2021 (in Chinese).
[12] ROUSSEL N. Rheology of fresh concrete: from measurements to predictions of casting processes[J]. Materials and Structures, 2007, 40(10): 1001-1012.
[13] 吉旭平, 蒋亚清, 张风臣, 等. 马来酸三乙醇胺酯对水泥水化的影响[J]. 硅酸盐通报, 2020, 39(12): 3770-3774.
JI X P, JIANG Y Q, ZHANG F C, et al. Effect of triethanolamine maleate on cement hydration[J]. Bulletin of the Chinese Ceramic Society, 2020, 39(12): 3770-3774 (in Chinese).
[14] 孙友康. 功能性轻集料及高比强轻质混凝土开发与应用[D]. 南京: 东南大学, 2017.
SUN Y K. Development and application of lightweight aggregate and high strength lightweight concrete[D]. Nanjing: Southeast University, 2017 (in Chinese).
[15] 严锐. 泡沫混凝土的流变性能研究[D]. 合肥: 合肥工业大学, 2017.
YAN R. Research on rheological properties of foam concrete[D]. Hefei: Hefei University of Technology, 2017 (in Chinese).
[16] 白应华, 田冉, 李华伟, 等. 增稠剂与减水剂对泡沫混凝土孔结构稳定性的影响[J]. 新型建筑材料, 2021, 48(9): 115-119.
BAI Y H, TIAN R, LI H W, et al. Influence of thickener and water reducer on stability of cellular concrete pore structure[J]. New Building Materials, 2021, 48(9): 115-119 (in Chinese).
[17] CAI Y D, LIU D M, YAO Y B, et al. Fractal characteristics of coal pores based on classic geometry and thermodynamics models[J]. Acta Geologica Sinica-English Edition, 2011, 85(5): 1150-1162.
[18] 王培铭, 赵国荣, 张国防. 纤维素醚在新拌砂浆中保水增稠作用及其机理[J]. 硅酸盐学报, 2017, 45(8): 1190-1196.
WANG P M, ZHAO G R, ZHANG G F. Mechanism on water retention and thickening of cellulose ethers in fresh mortars[J]. Journal of the Chinese Ceramic Society, 2017, 45(8): 1190-1196 (in Chinese).
[19] EUGENIN C, NAVARRETE I, BREVIS W, et al. Air bubbles as an admixture for printable concrete: a review of the rheological effect of entrained air[J]. 3D Printing and Additive Manufacturing, 2022, 9(1): 64-80.