Study on Centroplasm Effects of SAP Aggregate Concrete

Abstract

Abstract: This study quantitatively characterized the positive and negative centroplasm effects of superabsorbent polymer (SAP) aggregate with different particle sizes (6~20 mm) by testing the compressive strength of concrete with single SAP or expanded polystyrene (EPS) aggregate, drawing on the centroplasm hypothesis. The results show that the water release of SAP aggregate exhibits a positive centroplasm effect on cement mortar due to the interfacial enhancement and a negative centroplasm effect due to pore formation. The empirical formula of negative centroplasm effects caused by pores induced by SAP aggregate is proposed. With the increase of SAP aggregate size, its negative centroplasm effect increases, while its positive centroplasm effect increases first and then decreases. The concept of "critical size" of SAP aggregate in mortar with different water-cement ratios is proposed. It is related to the water-cement ratio and the curing age of mortar.

Key words: superabsorbent polymer, centroplasm hypothesis, internal curing, interfacial transition zone, mechanical property

CLC Number:

TU528.2

LIU Yunpeng, PENG Bo, WANG Shaohui, WANG Fazhou. Study on Centroplasm Effects of SAP Aggregate Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(6): 1970-1979.

References

[1] 王发洲. 高性能轻集料混凝土研究与应用[D]. 武汉: 武汉理工大学, 2003.
WANG F Z. Research on high performance lightweight aggregate concrete (HPLC) and its application[D]. Wuhan: Wuhan University of Technology, 2003 (in Chinese).
[2] 刘云鹏, 申培亮, 何永佳, 等. 特种骨料混凝土的研究进展[J]. 硅酸盐通报, 2021, 40(9): 2831-2855.
LIU Y P, SHEN P L, HE Y J, et al. Research progress of special aggregate concrete[J]. Bulletin of the Chinese Ceramic Society, 2021, 40(9): 2831-2855 (in Chinese).
[3] BOUGUERRA A, LEDHEM A, DE BARQUIN F, et al. Effect of microstructure on the mechanical and thermal properties of lightweight concrete prepared from clay, cement, and wood aggregates[J]. Cement and Concrete Research, 1998, 28(8): 1179-1190.
[4] ZHANG Y, LI B B, LI Z, et al. Seismic performance of interior beam-column joints in reinforced glazed hollow bead insulation concrete frames[J]. Engineering Structures, 2021, 228: 111494.
[5] ZUDA L, DRCHALOVÁ J, ROVNANÍK P, et al. Alkali-activated aluminosilicate composite with heat-resistant lightweight aggregates exposed to high temperatures: mechanical and water transport properties[J]. Cement and Concrete Composites, 2010, 32(2): 157-163.
[6] 王祖华. 混凝土与砌体结构[M]. 广州: 华南理工大学出版社, 1992.
WANG Z H. Concrete and masonry structure[M]. Guangzhou: South China University of Technology Press, 1992 (in Chinese).
[7] 吴中伟. 混凝土科学技术近期发展方向的探讨[J]. 硅酸盐学报, 1979, 7(3): 262-270.
WU Z W. An approach to the recent trends of concrete science and technology[J]. Journal of the Chinese Ceramic Society, 1979, 7(3): 262-270 (in Chinese).
[8] 廉慧珍, 师海霞. 解读吴中伟“水泥基复合材料的中心质假说”[J]. 硅酸盐学报, 2020, 48(5): 777-786.
LIAN H Z, SHI H X. Clarification of a hypothesis on "Centroplasm of cement-based composite" proposed by Wu Zhongwei[J]. Journal of the Chinese Ceramic Society, 2020, 48(5): 777-786 (in Chinese).
[9] 吴中伟, 廉慧珍. 高性能混凝土[M]. 北京: 中国铁道出版社, 1999.
WU Z W, LIAN H Z. High performance concrete[M]. Beijing: China Railway Press, 1999 (in Chinese).
[10] 吴中伟. 混凝土材料学: 各种混凝土的组成与结构[J]. 混凝土及建筑构件, 1980(4): 1-6.
WU Z W. Concrete materials science: composition and structure of various concrete[J]. Concrete, 1980(4): 1-6 (in Chinese).
[11] 王发洲, 杨进, 程华, 等. 基于内部孔结构的功能型混凝土研究初探[J]. 建筑材料学报, 2015, 18(4): 608-613+639.
WANG F Z, YANG J, CHENG H, et al. Preliminary exploration on pore structural/functional integration for concrete[J]. Journal of Building Materials, 2015, 18(4): 608-613+639 (in Chinese).
[12] 王韶辉, 刘云鹏, 翟延波, 等. 吸水树脂集料混凝土的力学与抗氯离子侵蚀性能初探[J]. 武汉理工大学学报, 2017, 39(10): 33-36.
WANG S H, LIU Y P, ZHAI Y B, et al. Influence of water absorbent resin aggregate on mechanics and anti-chloride ion corrosion resistance of concrete[J]. Journal of Wuhan University of Technology, 2017, 39(10): 33-36 (in Chinese).
[13] WANG F Z, YANG J, CHENG H, et al. Study on mechanism of desorption behavior of saturated superabsorbent polymers in concrete[J]. ACI Materials Journal, 2015, 112(3): 463-469.
[14] YANG J, WANG F Z. Influence of assumed absorption capacity of superabsorbent polymers on the microstructure and performance of cement mortars[J]. Construction and Building Materials, 2019, 204: 468-478.
[15] WANG F Z, YANG J, HU S G, et al. Influence of superabsorbent polymers on the surrounding cement paste[J]. Cement and Concrete Research, 2016, 81: 112-121.
[16] 杨进. 高吸水树脂内养护混凝土的微观结构与性能[D]. 武汉: 武汉理工大学, 2017.
YANG J. Microstructure and performance of cementitious materials internally cured by superabsorbent polymers[D]. Wuhan: Wuhan University of Technology, 2017 (in Chinese).
[17] HASHOLT M T, JENSEN O M, KOVLER K, et al. Can superabsorent polymers mitigate autogenous shrinkage of internally cured concrete without compromising the strength?[J]. Construction and Building Materials, 2012, 31: 226-230.
[18] HU X B. Synthesis and properties of silk sericin-g-poly (acrylic acid-co-acrylamide) superabsorbent hydrogel[J]. Polymer Bulletin, 2011, 66(4): 447-462.
[19] PLANK J, SACHSENHAUSER B. Experimental determination of the effective anionic charge density of polycarboxylate superplasticizers in cement pore solution[J]. Cement and Concrete Research, 2009, 39(1): 1-5.
[20] 牛恒茂, 武文红, 李仙兰, 等. 纳米压痕在水泥基材料微观结构与力学性能研究中的应用[J]. 硅酸盐通报, 2016, 35(8): 2439-2446.
NIU H M, WU W H, LI X L, et al. Advancement of nanoindentation in micro-structure and mechanical property of cementitious materials[J]. Bulletin of the Chinese Ceramic Society, 2016, 35(8): 2439-2446 (in Chinese).
[21] LE ROY R, PARANT E, BOULAY C. Taking into account the inclusions’ size in lightweight concrete compressive strength prediction[J]. Cement and Concrete Research, 2005, 35(4): 770-775.
[22] DENG Z P, CHENG H, WANG Z G, et al. Compressive behavior of the cellular concrete utilizing millimeter-size spherical saturated SAP under high strain-rate loading[J]. Construction and Building Materials, 2016, 119: 96-106.
[23] ZHONG P H, HU Z L, GRIFFA M, et al. Mechanisms of internal curing water release from retentive and non-retentive superabsorbent polymers in cement paste[J]. Cement and Concrete Research, 2021, 147: 106494.