混凝土,从理论上讲加进25％水即凝固。但在实际操作中,为便于搅拌和浇灌,往往再加进60％的水。这些多余的水份在混凝土干燥时,成为裂缝和降低质量的一项原因。日本九州大学成功地研究出搅拌时不加水的新施工方法。其优点是可防止裂缝、离析及室内结露等。这种新型混凝土称“FASC混凝土”。它是在普通水泥中,加入定量细砂,再加入直径约2厘米、带有许多小孔的人造轻质骨料以代替石砾,进行混合搅拌。因在人造轻质骨料中,事先已吸收必要的水份,经搅拌后,水泥即可徐徐与其水份相融合而凝固。 Concrete, theoretically added to 25% water, is solidified. However, in practice, 60% of water is often added to facilitate mixing and pouring. These excess moisture become a cause of cracks and degraded quality when the concrete is dry. Kyushu University in Japan successfully researched new construction methods without water when mixing. The advantage is that it can prevent cracks, segregation and condensation in the room. This new type of concrete is called “FASC concrete.” It is in ordinary cement, adding quantitative fine sand, and then adding artificial light aggregate with a diameter of about 2 cm, with many small holes to replace the gravel, mixing and stirring. Because in the artificial lightweight aggregate, the necessary water has been absorbed beforehand, and after stirring, the cement can gradually fuse with its moisture and solidify.