Influence mechanism of curing temperature on the characteristics of dredged ultrafine mortar from Yangtze River

CHEN Xudong; WU Chaoguo; CHEN Zhang; NING Yingjie; BAI Lihui

doi:10.13801/j.cnki.fhclxb.20220607.005

Volume 40 Issue 4

Apr. 2023

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Article Navigation > Acta Materiae Compositae Sinica > 2023 > 40(4): 2308-2320

CHEN Xudong, WU Chaoguo, CHEN Zhang, et al. Influence mechanism of curing temperature on the characteristics of dredged ultrafine mortar from Yangtze River[J]. Acta Materiae Compositae Sinica, 2023, 40(4): 2308-2320. doi: 10.13801/j.cnki.fhclxb.20220607.005

Citation:

CHEN Xudong, WU Chaoguo, CHEN Zhang, et al. Influence mechanism of curing temperature on the characteristics of dredged ultrafine mortar from Yangtze River[J]. Acta Materiae Compositae Sinica, 2023, 40(4): 2308-2320. doi: 10.13801/j.cnki.fhclxb.20220607.005

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Influence mechanism of curing temperature on the characteristics of dredged ultrafine mortar from Yangtze River

doi: 10.13801/j.cnki.fhclxb.20220607.005

1.
College of Civil Engineering and Transportation, Hohai University, Nanjing 210098, China
2.
Zhejiang Communications Construction Group CO., LTD., Hangzhou 310051, China

Funds: National Key R&D Program of China (2021 YFB2600200); National Natural Science Foundation of China (51979090); State Key Laboratory of High-Performance Civil Engineering Materials (2019 CEM002)

Received Date: 2022-04-02
Accepted Date: 2022-05-30
Rev Recd Date: 2022-05-10

Available Online: 2022-06-07

Publish Date: 2023-04-15

Abstract

Abstract

In order to realize the comprehensive utilization of dredged sand in the lower Yangtze River and expand the source of fine aggregate, the effects of different maintenance temperatures on different dredged sand admixtures mortar characteristics were investigated. Using dredged sand as raw material, three mortar mix ratios with different dredged sand admixtures were designed, and the effects of four curing temperatures of 40, 60, 80 and 90℃ on the compressive and flexural strengths at different ages were investigated, The microstructures of specimens with different curing temperatures and different dredged sand admixtures were analyzed by combining X-ray diffraction, thermogravimetric-differential scanning calorimetry, scanning electron microscopy and mercury injection test. The results show that with the increase of curing temperature, the distribution of hydration products in mortar is uneven, which hinder the subsequent hydration reaction. The compressive and flexural strengths of mortar increase first and then decrease. The higher the curing temperature is, the greater the steam curing damage is. The particle size of dredged sand is very small, and it has good filling effect. Appropriate incorporation of dredged sand can improve the compactness of the system, and reduce the number of harmful holes and multiple harmful holes, thereby improving the mechanical properties of mortar. Under the condition of steam curing, the pore structure defects of mortar increase, and the optimization effect of dredged sand is amplified, which can offset some adverse effects of steam curing to a certain extent. The enhancement rate of the dredged sand on the compressive strength gradually decreases with the increase of the curing temperature, and the maximum could enhance 31.35%. The enhancement of the flexural strength increases first and then decreases, and the maximum could enhance 14.29%.
- dredged superfine sand in Yangtze River,
- curing temperature,
- dredged sand admixture,
- mechanical properties,
- microstructure
Long Abstrsct
Innovation Points

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References(26)

References

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