Effect of Sulfonated Acetone Formaldehyde (SAF) on the Firing Resistance and Aggressive Attach of SRC-SF Composite Cement Pastes

Randa M Osman,S Al-Masry

doi:10.3844/ajeassp.2015.249.262

Randa M Osman, S Al-Masry

Open Access

https://doi.org/10.3844/ajeassp.2015.249.262

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Abstract

This work aimed to study the effect of the dosage of laboratory synthesized Sulfonated Acetone Formaldehyde (SAF) on the physic-mechanical characteristics and durability of SF-SRC cement pastes immersed in 4% MgCl2 or 4% MgSO4 solutions or at elevated temperatures up to 800°C. The compressive strength of thermally treatment cement pastes with 1.5% SAF increases up to 600°C, then decreases up to 800°C. Presence of 2.0% SAF works to produce a compact cementing structure, which decreases the accessibility of the penetration of chloride as well as sulphate ion penetration and enhances the durability, hence the total chloride and sulphate contents diminished.

Highlights

The durability of cementing materials has been a major concern of civil engineering professionals over the last few decades (Chen and Wu, 2013; Sánchez et al, 2011)
The effect of temperature on the properties of cement pastes admixed with various dosages of Sulfonated Acetone Formaldehyde (SAF) can be studied by the determination of the weight loss, bulk density, total porosity and compressive strength of hardened cement pastes treated up to 800°C
Based on the results of experimental study concerning the effectiveness of laboratory prepared SAF superplasticizer dosage up to 2 mass% on the hydration kinetics, total porosity, bulk density, compressive strength and durability of Sulphate Resisting Cement (SRC) pastes containing 10% Silica Fume (SF) cured in salt solutions and at elevated temperatures up to 800°C

Summary

Introduction

The durability of cementing materials has been a major concern of civil engineering professionals over the last few decades (Chen and Wu, 2013; Sánchez et al, 2011). Sulphate ions can enter into chemical reactions with certain constituents of concrete, producing sulphoaluminate hydrates, C4A.S3.H32 (ettringite), gypsum and M-S-H which has little binding properties (Page and Page, 2007). All of these reactions are accompanied by decrease in strength

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