Abstract
AbstractThis study is devoted to durability performance of a chemically-activated phosphorus slag-based composite cement (CAPSCC) against sodium sulfate attack. For this purpose, enough mortar specimens were prepared from phosphorus slag (80% by weight), Type II portland cement (14% by weight), and a compound chemical activator (6% by weight) at water-to-cement ratio of 0.37 and exposed to 5% sodium sulfate solution after being cured. Mortar specimens of both Types II and V portland cements (PC2 and PC5) were also prepared and used as control for comparison purposes. Based on experimental test results, after 12 months of exposure to 5% sodium sulfate solution, PC2, PC5, and CAPSCC exhibited 12.7, 7.5, and 2.1% loss in compressive strength, respectively. Measurements of expansion and weight changes were also done. Advanced studies by X-ray diffractometry and scanning electron microscopy were performed to characterize the products of the degradation process. All obtained results together confirmed the super...
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