基于颗粒最紧密堆积理论的真空搅拌 轻骨料混凝土配合比设计

为配制轻骨料混凝土，选用中空玻璃微珠和页岩陶粒作为减重材料，并基于颗粒最紧密堆积理论确定了水泥—玻璃微珠—硅灰体系的组成和用量。依照绝对体积法计算各组分的配合比，设计了3组不同胶凝体系与骨料体系比例的混凝土，最后选用比强度最高的一组，运用真空搅拌技术进一步提高混凝土的力学性能，并对比研究了不同真空度下混凝土的3 d、28 d的抗压强度和表观密度。试验结果表明，成功配制出了表观密度小于1 350 kg/m3、抗压强度大于40 MPa的轻骨料混凝土，可为轻骨料混凝土的发展与应用提供理论依据。

Mix Design of Vacuum Mixing Lightweight Aggregate Concrete Based on Particle Densely-Packing Theory

In view of the preparation of lightweight aggregate concrete, a selection has been made of hollow glass beads and shale ceramsite as weight reducing materials, with the composition and dosage of cement glass beads silica fume system determined based on the particle densely-packing theory. The mix proportion is calculated according to the absolute volume method, followed by a design of three groups of concrete with different proportions of cementitious system and aggregate system. Finally, the group with the highest specific strength is selected, and the vacuum mixing technology is used for a further improvement of the mechanical properties of concrete. A comparison has been made of the 3 d and 28 d compressive strength and apparent density of concrete of different vacuum degrees. A successful a preparation has been achieved of the lightweight aggregate concrete with an apparent density less than 1 350 kg/m3 and a compressive strength greater than 40 MPa, thus providing a theoretical basis for the development and application of lightweight aggregate concrete.