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    • 2. 发明申请
    • HIGHLY WORKABLE CONCRETE COMPOSITIONS HAVING MINIMAL BLEEDING AND SEGREGATION
    • 具有最小化和分离的高度可组合的混凝土组合物
    • US20090158960A1
    • 2009-06-25
    • US12247308
    • 2008-10-08
    • Per Just AndersenSimon K. Hodson
    • Per Just AndersenSimon K. Hodson
    • C04B7/00C04B24/24
    • C04B28/02C04B14/04C04B20/0048C04B20/0076C04B24/12C04B2103/0053C04B2103/12C04B2103/22C04B2103/304C04B2103/408C04B2103/44C04B2103/54C04B2103/61C04B2103/65C04B2103/67C04B2103/69
    • Concrete compositions have a fine-to-coarse aggregate ratio optimized for increased workability with minimal segregation and bleeding. The concrete compositions include at least water, cement, coarse aggregate, and fine aggregate and have a slump of at least 1 inch and a 28-day compressive strength of at least about 1500 psi. Workability is improved by minimizing the viscosity as a function of the aggregate content, while minimizing segregation and bleeding. To improve workability, the concrete compositions include between 45% and 65% fine aggregate and between 35% and 55% coarse aggregate as a function of total aggregate volume. For relatively low strength concrete (1500-4500 psi), the fine aggregate is 55-65% of the total aggregate volume. For medium strength concrete (4500-8000 psi), the fine aggregate is 50-60% of the total aggregate volume. For high strength concrete (>8000 psi), the fine aggregate is 45-55% of the total aggregate volume. Overall workability can be maintained or improved even if slump is decreased.
    • 混凝土组合物具有细至粗的骨料比,其优化用于增加可加工性,同时具有最小的分离和渗血。 混凝土组合物至少包括水,水泥,粗骨料和细骨料,并具有至少1英寸和28天压缩强度至少约1500psi的坍落度。 通过最小化作为骨料含量的函数的粘度,同时最小化偏析和渗色来改善可加工性。 为了提高可加工性,具体组合物包括45%至65%的细骨料和35%至55%之间的粗骨料作为总骨料体积的函数。 对于相对较低强度的混凝土(1500-4500psi),细骨料占总骨料体积的55-65%。 对于中强度混凝土(4500-8000psi),细骨料占总骨料体积的50-60%。 对于高强度混凝土(> 8000 psi),细骨料为总骨料体积的45-55%。 即使坍落度下降,总体可操作性也可以保持或提高。