Experimental study on the early tensile behavior of fly ash cement mortar containing NMK

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Journal of Dalian Maritime University ›› 2025, Vol. 51 ›› Issue (4) : 101-110.

FAN Yingfang^*，YU Mingjie，LI Qiuchao

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Abstract

The effect of nano-metakaolin on the tensile properties of fly ash cement mortar at early age was investigated. 4 nano-metakaolin contents (1%, 3%, 5%, 7%) and 3 fly ash contents (10%, 20%, 30%) were taken into consideration. 40 cement mortar specimens were prepared in the laboratory. The direct tensile experiments were executed on the prepared mortars at early age (3h, 4h, 5h, 6h, 8h, 10h). The digital image correlation technique was applied to monitor the strain on the surface of specimens during the tensile process. Tensile behavior of the mortar specimens were obtained. The results show that the addition of fly ash leads to a reduction in the tensile strength, the tensile strength of mortar with 30% fly ash at 6h decreased by 52.4% compared to ordinary mortar. The addition of nano-metakaolin significantly improves the tensile properties of both ordinary mortar and fly ash cement mortar at early age. Specifically, the tensile strength of mortar with 5% nano-metakaolin reached 4 times that of ordinary cement mortar at 6h. Moreover, incorporating 5% nano-metakaolin increased the 6h ultimate tensile strength of mortar containing 10% fly ash by 23%.

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cement mortar / nano-metakaolin / fly ash / early age / tensile strength

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FAN Yingfang, YU Mingjie, LI Qiuchao. Experimental study on the early tensile behavior of fly ash cement mortar containing NMK[J]. Journal of Dalian Maritime University. 2025, 51(4): 101-110

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