Effect of Nanosilica Particle Size on the Water Permeability, Abrasion Resistance, Drying Shrinkage, and Repair Work Properties of Cement Mortar Containing Nano-SiO2

Sattawat Haruehansapong,Tawich Pulngern,Somchai Chucheepsakul

doi:10.1155/2017/4213690

Sattawat Haruehansapong, Tawich Pulngern + Show 1 more

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https://doi.org/10.1155/2017/4213690

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Abstract

This work presents the effect of nanosilica particle sizes on durability properties and repair work properties of cement mortar containing nanosilica (NS). Three different NS particle sizes of 12, 20, and 40 nm were used and compared with those of cement mortar without NS and cement mortar with silica fume (SF). Interesting results were obtained in which the particle size of NS affected directly the abrasion resistance and water permeability. NS with particle size of 40 nm is the optimum size and gave the highest abrasion resistance and water permeability. For repair work properties, cement mortars containing NS (12 and 20 nm) and SF experienced higher drying shrinkage than that of cement mortar without NS and then presented cracking behavior and debonding between the cement mortars and concrete substrate. Cement mortar containing 40 nm of NS gave the lowest drying shrinkage, the lowest crack number, and the highest adhesive strength. These results indicate that the particle size of NS affected not only the durability properties but also the repair work properties of cement mortar.

Highlights

In recent years, the repair material used for the maintenance of concrete structures has become a significant part of the total cost of construction [1]
The weight losses representing the abrasion resistance of control cement mortar (OPC), cement mortar with silica fume (SF), and cement mortar with various particle sizes of NS are illustrated in Figure 4 and indicated that the abrasion resistance of cement mortar with NS was remarkably improved
These works suggested that the abrasion resistance increased with the addition of NS for all ages of cement mortar

Summary

Introduction

The repair material used for the maintenance of concrete structures has become a significant part of the total cost of construction [1]. Failure of a concrete repair material is more likely to occur due to incompatibility between the repair material and the concrete substrate, leading to cracking and debonding [5]. Some researchers [6,7,8,9,10,11] suggested that an important factor in successful repair work of concrete structures is to achieve sufficient bonding between the repair material and the concrete substrate [6,7,8,9,10,11] while another critical factor affecting the successful repair work of structures is the selection of repair material [12]. The published researches concluded that repair materials used for the maintenance of concrete structure are very important. Almost published researches focused on cracking and debonding behaviors of repair materials. Information about durability and repair work properties of these repair materials is still rarely found

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