Calcium Sulfoaluminate Belite - Portland Cement Concrete Mixtures for Rapid Hydration and Strength Gain
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Publisher:The Ohio State University
Series/Report no.:The Ohio State University. Department of Civil, Environmental and Geodetic Engineering Honors Theses; 2021
With infrastructure such as bridges, roadways, and runways needing constant maintenance and repair, more efficient and durable concrete materials are needed to ensure the safety of these structures. Ordinary portland cement (OPC) hydration and setting processes are too slow for these projects, which often run on tight schedules to minimize traffic interruptions, so accelerating admixtures, accelerators, are used to speed up the setting and strength gain. However, the most common and effective accelerator, CaCl2 can promote the corrosion of steel reinforcement. Reinforced concrete structures rely on steel reinforcement for increased stability and tensile capacity, so losses due to corrosion can reduce the capacity and safety of structures. Calcium sulfoaluminate belite (CSAB) cement may provide a solution to this problem, while also being a greener and more sustainable cement binder. CSAB cement is a rapidly hydrating cementitious binder, setting in as little as 15 minutes without accelerators. This project will research the use of CSAB cements combined with OPC to determine if it is a viable option to replace accelerators while simultaneously reducing the amount of OPC used; while also providing similar or better properties. To test this, five mixes with different ratios of OPC to CSAB will be used to determine the best combination of materials to optimize properties. The design mixtures were tested to compare the setting time, compressive and tensile strength, resistivity (a measure of durability), and workability. It was hypothesized that CSAB can be use as an alternative to CaCl2 accelerators, increasing early rates of strength gain while also providing durable concrete.
Academic Major: Civil Engineering
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