Effect of Synergistic Internal Curing by Rice Husk Ash and SAP on Properties of Alkali-Activated Slag Cementitious Materials

doi:10.16552/j.cnki.issn1001-1625.20241118.004

Abstract

Abstract: Large early autogenous shrinkage and high cracking risk are important problems that limit the popularization and application of alkali-activated slag (AAS) cementitious materials. The use of superabsorbent polymer (SAP) for internal curing is one of the effective methods to solve these problems, but this method will reduce the mechanical properties of AAS. In this study, porous active rice husk ash (RHA) and SAP were combined to form a composite internal curing component (SAP-RHA, SR). The effects of SR and SAP internal curing on the working performance, shrinkage characteristics, hydration products and mechanical properties of AAS were compared and analyzed. The results show that compared with SAP internal curing alone, SR internal curing not only further reduces the autogenous shrinkage of AAS, but also effectively improves its compressive strength, which solves the problem of mechanical properties reduction caused by SAP internal curing to a certain extent.

Key words: alkali-activated slag, superabsorbent polymer, rice husk ash, autogenous shrinkage, compressive strength

CLC Number:

TU525

LYU Yang, WU Yuanshuai, Ge Yunlu, CHEN Yang, XU Jinsheng, JIAN Shouwei, DAN Jianming, WEN Xiaodong, LI Xiangguo. Effect of Synergistic Internal Curing by Rice Husk Ash and SAP on Properties of Alkali-Activated Slag Cementitious Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(2): 634-641.

References

[1] GRANT NORTON M, PROVIS J L. Geopolymer technology: the current state of the art[J]. Journal of Materials Science, 2020, 55(28): 13487-13489.
[2] 庄培镇, 马玉玮, 罗甜恬, 等. 碱激发矿渣/粉煤灰净浆/砂浆力学性能研究[J]. 硅酸盐通报, 2022, 41(10): 3578-3589.
ZHUANG P Z, MA Y W, LUO T T, et al. Mechanical properties of alkali-activated slag/fly ash paste/mortar[J]. Bulletin of the Chinese Ceramic Society, 2022, 41(10): 3578-3589 (in Chinese).
[3] PART W K, RAMLI M, CHEAH C B. An overview on the influence of various factors on the properties of geopolymer concrete derived from industrial by-products[J]. Construction and Building Materials, 2015, 77: 370-395.
[4] 张文艳, 林华夏, 王帅, 等. 减缩剂对碱激发煤矸石-矿渣胶凝材料性能的影响[J]. 硅酸盐通报, 2022, 41(2): 526-535.
ZHANG W Y, LIN H X, WANG S, et al. Effect of shrinkage reducing agent on properties of alkali-activated coal gangue-slag cementitious material[J]. Bulletin of the Chinese Ceramic Society, 2022, 41(2): 526-535 (in Chinese).
[5] CHIDIAC S E, MIHALJEVIC S N, KRACHKOVSKIY S A, et al. Efficiency measure of SAP as internal curing for cement using NMR & MRI[J]. Construction and Building Materials, 2021, 278: 122365.
[6] SONG C, CHOI Y C, CHOI S. Effect of internal curing by superabsorbent polymers: internal relative humidity and autogenous shrinkage of alkali-activated slag mortars[J]. Construction and Building Materials, 2016, 123: 198-206.
[7] BIE R S, SONG X F, LIU Q Q, et al. Studies on effects of burning conditions and rice husk ash (RHA) blending amount on the mechanical behavior of cement[J]. Cement and Concrete Composites, 2015, 55: 162-168.
[8] RAJASHEKHAR REDDY K, HARIHANANDH M, MURALI K. Strength performance of high-grade concrete using rice husk ash (RHA) as cement replacement material[J]. Materials Today: Proceedings, 2021, 46: 8822-8825.
[9] SALAS A, DELVASTO S, DE GUTIERREZ R M, et al. Comparison of two processes for treating rice husk ash for use in high performance concrete[J]. Cement and Concrete Research, 2009, 39(9): 773-778.
[10] DE SENSALE G R, RIBEIRO A B, GONÇALVES A. Effects of RHA on autogenous shrinkage of Portland cement pastes[J]. Cement and Concrete Composites, 2008, 30(10): 892-897.
[11] RODRÍGUEZ DE SENSALE G. Strength development of concrete with rice-husk ash[J]. Cement and Concrete Composites, 2006, 28(2): 158-160.
[12] JIANG D B, LI X G, LV Y, et al. Autogenous shrinkage and hydration property of alkali activated slag pastes containing superabsorbent polymer[J]. Cement and Concrete Research, 2021, 149: 106581.
[13] LI Z M, ZHANG S Z, LIANG X H, et al. Internal curing of alkali-activated slag-fly ash paste with superabsorbent polymers[J]. Construction and Building Materials, 2020, 263: 120985.
[14] LIU J H, SHI C J, MA X W, et al. An overview on the effect of internal curing on shrinkage of high performance cement-based materials[J]. Construction and Building Materials, 2017, 146: 702-712.
[15] TU W L, ZHU Y, FANG G H, et al. Internal curing of alkali-activated fly ash-slag pastes using superabsorbent polymer[J]. Cement and Concrete Research, 2019, 116: 179-190.