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Title: Research and Analysis of a Novel Waterproofing Agent with Strength Enhancing Ability

Author(s): Yufeng Li, Serina Ng, Gan Wang, Lei Liu, Long Wang

Publication: Symposium Paper

Volume: 354


Appears on pages(s): 309-328

Keywords: fatty acid; octadecanoic acid; amines; waterproofing; concrete strength

DOI: 10.14359/51736084

Date: 7/1/2022

In order to improve the durability of concrete, a novel waterproofing agent was developed and its effect on concrete performance was studied in detail. Through the research, it is found that when stearic acid is present in the form of ammonium salt in the waterproofing agent, concrete has the highest compressive strength and the best waterproof performance, and the optimum nNH3: noctadecanoic acid is 1.34, woctadecanoic acid: wamines is 6.45. When the dosage of the waterproofing agent in concrete is 10-30 kg/(1 m³ concrete), the 48h water absorption rate of concrete is reduced by 44.7%~57.4%, and strength increases by at least 30%. By comparing with other waterproofing agents of the same type at home and abroad, it is found that the waterproofing agent provided in this paper has the lowest chloride ion permeability, concrete compactness, and water absorption. After adding a waterproofing agent to the concrete, the chloride migration coefficient and electric flux of concrete are reduced, and the reduction was 37.7% and 22.6%, respectively. The waterproofing agent is a solid-liquid mixture.