青稞秸秆灰对氯氧镁水泥砂浆粘结强度的影响

doi:10.11896/cldb.22040311

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Abstract In order to study the process of using magnesium oxychloride cement mortar (MOCM) modified with highland barley straw ash (HBSA) as a protective layer for ordinary concrete (NC) to resist brine erosion in the western salt lake area, this work uses ordinary concrete as a bonding agent. For the base layer, the effects of factors such as incorporating HBSA into MOCM, applying interface agents on the concrete base layer, and different MOCM thicknesses on its bonding strength were studied. The influence of various factors on the bond strength of MOCM was studied through bond pull-out tests, the optimal design parameters were determined, and the damage and deterioration rules of the bond strength of HBSA-modified MOCM under salt brine erosion environment were further analyzed. The phase composition, functional group structure and micro-morphological characteristics of MOCM were analyzed by microscopic testing technology, and the mechanism of the influence of HBSA on the bonding properties of MOCM was revealed. The results show that the MOCM with a thickness of 18 mm, doped with HBSA and coated with an interfacial agent has the highest bond strength and the strongest resistance to salt brine erosion. There are more active SiO₂ in HBSA, which can undergo secondary hydration reaction with the hydration product of MOCM to generate hydrated magnesium silicate (M-S-H) gel, which fills the internal pores of MOCM, enhances compactness and improves bond strength.

Key words： magnesium oxychloride cement mortar active mixed materials highland barley straw ash bonding property micro structure influence mechanism

Published: 10 December 2023 Online: 2023-12-08

CLC number:

TU526

Fund:National Natural Science Foundation of China (51868044) and the Basic Research Program of Qinghai Province(2022-ZJ-921).

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	Articles by authors
	SHU Xiuyuan
	QIAO Hongxia
	CAO Feng
	CUI Lijun

Cite this article:

SHU Xiuyuan,QIAO Hongxia,CAO Feng, et al. Effect of Highland Barley Straw Ash on the Bonding Strength of Magnesium Oxychloride Cement Mortar[J]. Materials Reports, 2023, 37(23): 22040311-6.

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http://www.mater-rep.com/EN/10.11896/cldb.22040311 OR http://www.mater-rep.com/EN/Y2023/V37/I23/22040311

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