水泥-白肥-硫酸渣基建筑砌块研究

Study on Cement-White Phosphorus Fertilizer-Sulfate Residue-Based Building Block

以水泥和白肥作为复合胶凝体系,研究了水泥-白肥-硫酸渣生产建筑砌块的可行性。当白肥和水泥掺量均为20%~60%时,随白肥与水泥质量比从1∶3逐步上升到3∶1,水泥-白肥-硫酸渣基建筑砌块用水量从240m L逐步上升到342m L,干密度从1816kg/m^3逐步下降到1410kg/m^3,7d强度呈现先增长后下降趋势,抗压、抗折强度最高值分别为16.7MPa、3.0MPa,其机理为白肥与水泥水化产物Ca(OH)_2反应生成羟基磷灰石,与C-S-H协同形成稳定的复合胶凝体系,可应用于砌块生产中,变废为宝。

Using cement and white phosphorus fertihzer as the composition cementing system, the feasibihty of producing building blocks based on cement, white phosphorus fertilizer and pyrite cinder were studied. When contents of white phosphorus fertilizer and cement in blocks were both from 20% to 60%, with white phosphorus fertilizer cement＇ratio rising from 1：3 to 3：1 gradually, water consumption of the building blocks based on cement, white phosphorus fertilizer and pyrite cinder increased from 240mL to 342mL, dry density of the blocks decreased from 1816kg/m^3 to 1410kg/m^3 and 7d strength presented a first growing after decreasing tend, the maximums of compressive strength and flexural strength of the blocks were 16.TMPa and 3.0MPa respectively. The mechanism is that white phosphorus fertilizer react with cement hydration product Ca（OH）2 to generate Ca10（PO4）6（OH）2, which could form stable composite gelled system combined with C-S-H. When applied successfully in blocks, that could transform waste into treasure.