不同粉磨工艺水泥的颗粒、矿物组成分布及性能

研究了采用不同粉磨工艺制备的水泥的颗粒分布及矿物组成分布对水泥与混凝土物理性能的影响．研究结果表明：水泥颗粒分布与粉磨设备条件及工艺参数密切相关，选用高效选粉机，增大循环负荷及控制适当的比表面积，可获得较窄的颗粒分布；由于C3S易磨性较好，易富集于水泥细颗粒中，通过提高水泥颗粒的集中程度及适当增大比表面积，可有效地把熟料中的C3S富集于30μm以下的水泥颗粒中；当水泥熟料质量、混合材质量、水泥比表面积控制水平较接近，水泥颗粒分布集中(主要集中在5～30μm范围)时，水泥的标准稠度需水量较大，凝结时间较长，1d强度较低，但3d，28d抗压强度较高，在混凝土中则表现为新拌混凝土泌水较严重，1d抗压强度偏低，3d．28d抗压强度增幅较大．

Particle Size Distribution, Mineral Composition Distribution and Performance of Cement Prepared by Different Grinding Technology

The influences of the particle size distribution (PSD) and the mineral composition distribution of cement prepared by different grinding technology on the physical performances of cement and concrete were investigated. The results show that there is a close relationship between PSD and grinding conditions as well as grinding system parameters. Narrower PSD can be obtained by using the high-efficiency separator with higher circulating-load and proper specific surface area. With narrower PSD and higher specific surface area,most of C3 S in clinker can efficiently enrich in particles smaller than 30 μm, due to the good grindability and enrichment of C3S in cement particles. When the qualities of clinker and admixtures, as well as the specific surface area of cement are kept stable, narrower PSD ( most particles are in the size range of 0 ～ 30 μm)results in higher water demand for normal consistency of cement paste, longer setting time, lower 1-day compressive strength and higher 3- and 28-day compressive strengths. The concrete prepared from this cement will be of great bleeding and low 1-day compressive strength and high 3- and 28-day compressive strengths.