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Study on the anti-corrosion properties of hydrophobic cement mortar containing coral sand

Zhao Yayun, Wang Qing, Song Qingnan, Xu Shuangshuang

Archives of Civil and Mechanical Engineering

2023

Vol. 23, no. 3

art. no. e177, 2023

The high porosity and strong water absorption of coral sand (CS) lead to the decline of the corrosion resistance of CS cement mortar. In this study, an environmentally friendly method of preparing hydrophobic concrete with water-repellent and anti-corrosion properties using CS is proposed. CS was modified by stearic acid to reduce the excessive water absorption caused by its high porosity. The prepared modified CS (M-CS) was used to partially replace the sand in the cement mortar to fabricate hydrophobic cement mortar, the water contact angle of which was found to be 115.9°. The cumulative water absorption, compressive strength, and anti-corrosion properties of hydrophobic cement mortar were explored. The cumulative water absorption of the hydrophobic mortar was found to be 49.75% lower than that of ordinary cement mortar. The compression test results show that a 10% content of M-CS can improve the compressive strength of cement mortar. Moreover, the corrosion resistance was found to be enhanced with the increase of the M-CS content. The hydrophobic cement mortar developed in this study is expected to strengthen the corrosion resistance of cement mortar used for coastal engineering.