What type of cement is no longer used?
Natural cement and certain early formulations of high-alumina cement or high-alkali cements are largely obsolete or restricted in modern structural construction practices. Natural cement, which was manufactured by burning natural argillaceous limestone without precise artificial proportioning, has been entirely replaced by standardized Portland cement due to inconsistencies in strength and quality. Additionally, specific early formulations containing hazardous chemical additives, such as asbestos-reinforced cement products or cements prone to catastrophic conversion reactions and structural degradation over time, have been phased out due to safety regulations and engineering advancements.
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