Influence of polyacrylic ester and silica fume on the mechanical properties of mortar for repair application

Chaohua Jiang,Xiaobin Zhou,Da Chen,Shanshan Huang

doi:10.1177/1687814016683856

Abstract

Experimental investigations on the influence of different amounts of polyacrylic ester and silica fumes on the mechanical properties of mortar such as the compressive strength, splitting tensile strength, bonding strength, and abrasion resistance are presented in this article. The results show that the compressive and splitting tensile strength of mortar can be improved with the addition of polyacrylic ester and silica fumes. Results obtained from both the direct tensile bond test and flexural bond test indicate that the addition of polyacrylic ester and silica fumes improves the bond strength significantly, and the enhancement is more obvious with polyacrylic ester paste as interfacial adhesives. Furthermore, mortar incorporation of polyacrylic ester and silica fumes shows superior abrasion resistance compared to the control mortar. Therefore, the correct combination of polyacrylic ester and silica fumes to produce mortars has been shown to have synergistic effects, which results in excellent properties including high bond strength and superior abrasion resistance. Mortars containing polyacrylic ester and silica fumes are ideal for repairing concrete especially for hydraulic concrete structure.

Highlights

Concrete is a composite material with low tensile strength and weak impact resistance.[1]
When adding 10%, 20%, and 30% polyacrylic ester (PAE) separately and 10% Silica fume (SF), compressive strength of mortar increases 14.12%, 9.32%, and 5.12%, respectively, at 28 days compared with M0
The compressive strength decreases with the content of PAE increase which indicates that the addition of polymer causes a decrease in the compressive strength

Summary

Introduction

Concrete is a composite material with low tensile strength and weak impact resistance.[1]. Research showed that the incorporation of polymer tended to reduce the compressive strength of cementitious materials.[10,11] In recent years, PAE has gained more application and has been proven to improve various engineering properties of mortars and concretes, such as workability, water absorption, flexural strength, and crack resistance. Gao et al.[18] found that the compressive and flexural strength of cement mortar could be improved with an addition of SF and polymer because of the water-reducing effect of polymer and pozzolanic reactions of SF.

Results

Conclusion