Influence of different surface treatment on water penetration resistance of concrete

Tianlun Li,Yonggen Wu,R Ruan

doi:10.1051/e3sconf/202127201015

Abstract

Concrete is easily affected by all kinds of erosive substances during its use. Surface treatment is a simple method to improve the surface compactness and water permeability resistance of concrete. In this paper, silicate infiltration agent, nano-SiO2 and ethyl silicate are selected as concrete surface treatment material. The results of water permeability test showed that all the three treatments can effectively improve the water resistance. Silicate infiltration agent and nano-SiO2 were the most effective, which greatly reduced the penetration depth of water from 66 mm to 34mm and 32 mm, while ethyl silicate was reduced to 50 mm. Through the water permeability test curve, we can see that the water entered the concrete under a certain pressure, and the result showed the shape of high, middle and low edge.

Highlights

Various corrosive substances in the external environment enter concrete along pores and cracks, causing loss of effective components or structural cracking through chemical reaction or physical expansion, and affecting the strength and bearing capacity of concrete
Water is an important factor in the formation strength of early concrete, but when concrete structures enter service, water infiltration will become a key factor leading to deterioration of concrete
The improvement of concrete by surface treatment has been studied deeply at home and abroad[3, 4].Through experiments, Zhao et al believed that the film-forming coating surface treatment materials were superior to silane materials in reducing water infiltration, chloride ion invasion and gas penetration[5], but the film-forming coating was affected by the external environment and would gradually fall off under the dry-wet cold and hot cycle[6].Aguiar compared the effects of acrylic resin, siloxane and epoxy resin treatment on the carbonation depth of concrete, and the research showed that epoxy resin had the strongest carbonation resistance and siloxane had the weakest carbonation resistance[7]

Summary

Introduction

Various corrosive substances in the external environment enter concrete along pores and cracks, causing loss of effective components or structural cracking through chemical reaction or physical expansion, and affecting the strength and bearing capacity of concrete. The improvement of concrete by surface treatment has been studied deeply at home and abroad[3, 4].Through experiments, Zhao et al believed that the film-forming coating surface treatment materials were superior to silane materials in reducing water infiltration, chloride ion invasion and gas penetration[5], but the film-forming coating was affected by the external environment and would gradually fall off under the dry-wet cold and hot cycle[6].Aguiar compared the effects of acrylic resin, siloxane and epoxy resin treatment on the carbonation depth of concrete, and the research showed that epoxy resin had the strongest carbonation resistance and siloxane had the weakest carbonation resistance[7]. The influence of three surface treatments on concrete permeability is evaluated from water permeability resistance

Materials

Test methods

Analysis of water seepage curve

Conclusions