Evaluation of the SR Portland cement against sodium and magnesium sulfate attack: a physical and comparative analysis of mortars

Abstract

Sulfate attack is a term used to describe a series of chemical reactions between sulfate ions and hydrated compounds of the hardened cement paste. Thus, the chemical composition of the binders used is important for the durability of the structure against this aggressive agent. The objective of the present research is to evaluate the influence of sodium and magnesium sulfates on physical properties (linear expansion, flexure tensile strength, and compressive strength) of mortars composed by SR cement (CP V - ARI RS), as commercially sold in Brazil. The results indicate that SR cement complies the requirements established by Brazilian standards, as to chemical composition and resistance to sodium sulfate. However, for magnesium sulfate, SR cement was harmful to mortars mainly in mechanical.

Roller Compacted Concrete with Recycled Concrete Aggregate for Paving Bases

“…Table 2. Chemical composition and physical properties of CP-V-ARI-RS cement, according to Souza et al [33]. recycled aggregate in international research studies, and their results recommended the use of RCA added to RCC due to its availability as a material for pavements [8][9][10][11].…”

“…Table 2. Chemical composition and physical properties of CP-V-ARI-RS cement, according to Souza et al [33]. The particle size distribution of aggregates.…”

Evaluation of external sulfate attack (Na2SO4 and MgSO4): Portland cement mortars containing siliceous supplementary cementitious materials

“…Moreover, RHA also presented partial amorphous minerals, the patterns resulting from the X-ray diffraction indicates crystallinity of its predominant phase, cristobalite. The distinguished molecular amorphous arrangement of the SF, indicating almost any crystallinity, in summation with the considerably higher specific surface area and lower particle size distribution (Figure 4) than the RHA, suggest that this material also present higher pozzolanic reactivity [13], [14], [36], [43]. Figure 4, the particle size distributions of the cement and the SCMs are presented.…”

“…The present paper is the third part of a research project to evaluate the sulfate attack on the physical-chemical properties of Portland cement composites, developed at the Federal University of Paraná (Figure 1). Part one and two can be seen in Souza et al [36] and [37].…”

“…Fixing the total amount of sulfate ions, the magnesium sulfate solution was prepared as 0.704 mol/L as well, (84.74g of MgSO4/L of solution). Finally, the solution volume-to-samples volume ratio was fixed as 4.0/1.0 [13], [14], [36], [41], along the whole exposure period.…”