原位聚合SAP用于半干旱土遗址根部掏蚀修补实验研究

doi:10.11896/cldb. 24110044

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Abstract Undercutting is one of the typical diseases of earth sites in semi-arid regions, in which basal sapping poses a serious threat to the stability and integrity of earth sites. This work added solution precursors to the repair soil samples, forming super absorbent polymer (SAP) through in-situ polymerization of acrylate-acrylamide-propyl sulfonic acid ternary copolymer, which can regulate water migration and improve the mechanical properties and durability of the repair materials. Then the in-situ polymerization mechanism of SAP were revealed and the phase composition and micro-morphology of soil samples modified with different contents of SAP was explored, as well as the impact on soil color, air permeability, compressive strength, resistance to disintegration, and salt cycle resistance. The results show that SAP successfully forms a honeycomb network structure within the soil matrix, enhancing the strength of the soil matrix. When the solid content of SAP is 5%, the compressive strength of the soil sample reaches 5.5 MPa, which is a fivefold increase compared to the blank soil sample. The addition of SAP reduces the color difference of the soil sample to less than 3%, while the change in air permeability is minimal, meeting the standards for cultural relic restoration materials. SAP improves the disintegration resistance of the soil by absorbing water to form a gel to block water, showing no significant changes in appearance after soaking in water for 48 h, while the dry strength remains at 4.52 MPa. The water retention effect of SAP can slow down moisture evaporation, thereby inhibiting salt crystallization. After seven cycles of salt resistance testing, the structure of the soil sample remains largely intact, with strength still at 2.89 MPa. Therefore, the addition of super absorbent materials is expected to become an effective approach for the erosion repair of archaeological sites through regulation.

Key words： earthen site undercutting repair in-situ polymerization super absorbent polymer

Published: 25 November 2025 Online: 2025-11-14

CLC number:	K878
	TB324

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	Articles by authors
	ZHANG Yifan
	LI Miao
	ZHENG Yao
	LIU Senbiao
	CHENG Zhuoyue
	LUO Hongjie
	LI Jianxi
	YAN Hongbin
	ZHU Jianfeng

Cite this article:

ZHANG Yifan,LI Miao,ZHENG Yao, et al. Experimental Research on Basal Sapping Repair in Semiarid Earthen Sites with In-situ Polymerization SAP[J]. Materials Reports, 2025, 39(22): 24110044-8.

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https://www.mater-rep.com/EN/10.11896/cldb. 24110044 OR https://www.mater-rep.com/EN/Y2025/V39/I22/24110044

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