Physicochemical, Mineralogical, and Mechanical Properties of Calcium Aluminate Cement Concrete Exposed to Elevated Temperatures

Abstract

One commonly used cement type for thermal applications is CAC containing 38–40% alumina, although the postheated behavior of this cement subjected to elevated temperature has not been studied yet. Here, through extensive experimentation, the postheated mineralogical and physicochemical features of calcium aluminate cement concrete (CACC) were examined via DTA/TGA, X-ray diffraction (XRD), and scanning electron microscopy (SEM) imaging and the variation in the concrete physical features and the compressive strength deterioration with temperature rise were examined through ultrasonic pulse velocity (UPV) values. In addition, other mechanical features that were addressed were the residual tensile strength and elastic modulus. According to the XRD test results, with the temperature rise, the dehydration of the C3AH6 structure occurred, which, in turn, led to the crystallization of the monocalcium dialuminate (CA2) and alumina (Al2O3) structures. The SEM images indicated specific variations in morphology that corresponded to concrete deterioration due to heat.

Effects of Fly Ash Composition to Mitigate Conversion of Calcium Aluminate Cement Composites

“…Calcium aluminate cement (CAC) or high-alumina cement is widely used and usually adopted in engineering applications with special purposes, such as refractory, biomaterial, ability to resist acid exposure, fast-setting, durable, and additive manufacturing concretes [1]. Several research programs were being determined, especially for the purposes of property improvement, durability, and more eco-friendly production processes.…”

Environmental Impact and Sustainability of Calcium Aluminate Cements

“…Calcium aluminate cements (CAC) are classified as hydraulic cements and are mostly used in applications involving extreme environments, which include refractories [1], acid resistant requirements, and fast setting cements. These materials are currently the subject of research on topics like property improvement, durability and more friendly manufacturing processes.…”

Rice Husk Ash Incorporation in Calcium Aluminate Cement Concrete: Life Cycle Assessment, Hydration and Strength Development

“…Moreover, CAC and ordinary Portland cement (OPC) have different chemical compositions, in that the alumina content of CAC is greater and its silica content is lower than those of OPC. CAC has superior features such as a fast development of strength and high resistance to fire, leading to applications in places where refractoriness and resistance to chemical attack are required [6][7][8]. Hence, one effective way to improve fire-resistance is to use CAC.…”