Despite having a high early mechanical strength and using sulfoaluminate cement as the primary cementitious material, self-compacting repair mortar (SCRM) suffers from rapid hydration rates leading to construction time constraints. This study examined how several forms of calcium sulfate, including hemihydrate gypsum, anhydrite, dihydrate affected SCRM’s workability, process, microstructure. Th...

Introduction: Sulfate species were verified by Pathfinder in 1997 and more recently by the Mars Exploration Rovers (MER). The best evidence for sulfates on Mars came from the Opportunity rover in Meridiani Planum, where data supporting the existence of Ca and Mg-sulfates were collected from alpha-proton X-ray spectroscopy and thermal emission spectroscopy [1,2]. Hyperspectral VNIR OMEGA images ...

Calcium sulfate exists in three forms, namely dihydrate or gypsum (CaSO4·2H2O), anhydrite (CaSO4), and hemihydrate bassanite (CaSO4·0.5H2O) depending on temperature, pressure, pH, formation conditions. The of calcium sulfates occurs widely nature many engineering settings. Herein, a dataset containing the experimental solubility data minerals, i.e., anhydrite, aqueous solutions is presented. co...

Abstract The construction material from anhydrite-II phosphogypsum is dense in structure and has good water resistance. But its disadvantages are low hydration activity long setting time. In this work, modified by adding a composite activator, which made of sulfuric acid steel slag, β-hemihydrate gypsum calcium aluminate cement. With this, the rate clearly increased time shortened. performance ...