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.

摘要 硫酸盐侵蚀（Sulfate attack）是用于描述硫酸盐离子与硬化水泥浆体水化产物之间一系列化学反应的术语。因此，所使用胶凝材料的化学成分对于结构抵御该侵蚀介质的耐久性至关重要。本研究旨在评估硫酸钠与硫酸镁对巴西市售SR水泥（CP V - ARI RS）配制的砂浆的物理性能（线性膨胀率、抗弯抗拉强度与抗压强度）的影响。研究结果表明，就化学成分与抗硫酸钠侵蚀性能而言，SR水泥符合巴西标准所规定的各项要求。然而针对硫酸镁侵蚀，SR水泥对砂浆的不利影响主要体现在力学性能方面。