An experimental investigation was carried out to enhance the properties of two‐stage concrete, also known as preplaced aggregate concrete (PAC), by adding ground granulated blast furnace slag (GGBS) and silica fume (SF) as partial replacement of cement at different proportions. PAC was produced using the gravity process by first placing the coarse aggregates into the formwork and then injecting a grout to fill in the voids in‐between the aggregates. Partial replacement of cement by GGBS and SF at 30 and 10%, respectively were found to be a suitable mix for PAC. Even though incorporation of GGBS and SF increased the shrinkage, strength and durability were improved. Generally, shrinkage produced by PAC was significantly lower than that of conventional concrete. By applying preplaced aggregate with an improved composition of grouts, properties of concrete, like strength and permeability, can be enhanced with shrinkage kept within an acceptable level.

中文翻译：

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用两阶段混凝土（预制骨料混凝土）中的高炉矿渣粉和硅粉部分替代水泥

通过添加磨碎的高炉矿渣（GGBS）和硅粉（SF）作为不同比例的水泥的部分替代品，进行了实验研究以增强两阶段混凝土（也称为预拌骨料混凝土（PAC））的性能。 。PAC是通过重力过程生产的，首先将粗骨料放入模板中，然后注入水泥浆以填充骨料之间的空隙。发现分别以30％和10％的GGBS和SF部分替代水泥是适合PAC的混合物。即使GGBS和SF的掺入增加了收缩率，强度和耐久性也得到了改善。通常，PAC产生的收缩率明显低于常规混凝土。通过使用水泥浆成分改善的预填充骨料，