玄武岩微筋对磷酸镁修补砂浆弯曲性能的增强增韧效应研究

doi:10.11896/cldb.23120021

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Abstract In order to study the strengthening and toughening modification of basalt minibar on magnesium phosphate cement repair mortar (MPCRM), the effects of different test parameters (fiber type, fiber volume fraction, water-binder ratio and curing conditions) on flexural strength and toughness of MPCRM were analyzed by four-point bending test. The results show that the basalt minibar has excellent flexural strengthening and toughening properties for MPCRM, and its toughening effect is better than that of traditional basalt monofilament fiber. Under the condition that the volume fraction of basalt minibar is not less than 1.0%, the flexural strength and toughness of MPCRM increase with the increase of volume fraction of basalt minibar. The flexural toughness of basalt minibar reinforced MPCRM decreases with the increase of water-binder ratio, while its flexural strength increases first and then decreases. The bending performance of basalt minibar reinforced MPCRM with water-binder ratio of 0.18 and the volume fraction of 1.5% is the best. The low temperature curing conditions cause the deterioration of the bending performance of MPCRM, the incorporation of basalt minibar can partially compensate for the frost damage of MPCRM.

Key words： magnesium phosphate cement repair mortar (MPCRM) basalt minibar pull-out energy flexural toughness low temperature curing

Published: 10 September 2024 Online: 2024-09-30

CLC number:

U444

Fund:National Natural Science Foundation of China (52068043), Construction Science and Technology Project of Gansu Province (JKR2021-07), Lanzhou Talent Innovation and Entrepreneur Ship Project (2019-RC-78).

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	LI Wei
	XIE Jian
	TONG Chenglong

Cite this article:

LI Wei,XIE Jian,TONG Chenglong. Study of Flexural Strengthening and Toughening Effect of Basalt Minibar on Magnesium Phosphate Cement Repair Mortar[J]. Materials Reports, 2024, 38(17): 23120021-9.

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http://www.mater-rep.com/EN/10.11896/cldb.23120021 OR http://www.mater-rep.com/EN/Y2024/V38/I17/23120021

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