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在联邦德国北部和荷兰等地砂资源充足而碎石不足。从这一实际情况出发,他们用水泥作胶结料,对各种粒径的砂制成的粗骨料进行了试验。为了得到适宜的颗粒,在制造中要剔除大于0.5毫米的砂粒。另外掺入石灰石粉或粉煤灰也是有效的。在重量比为:砂40—90％,水泥10—30％,石灰石粉0—30％的混合料中,加入水灰比为1.39—0.34的水,用成球盘,压缩滚筒,压块滚筒成形,制成圆颗粒,块状碎片、团块。掺20％水泥的颗粒强度要比掺
Sand resources in the northern regions of the Federal Republic of Germany and the Netherlands are sufficient and there is insufficient gravel. From this actual situation, they used cement as a binder to test coarse aggregates made of sand of various sizes. In order to obtain suitable particles, sand grains larger than 0.5 mm are to be removed during manufacture. It is also effective to incorporate limestone powder or fly ash. In the weight ratio of: 40-90% of sand, 10-30% of cement, and 0-30% of limestone powder, water with a water-cement ratio of 1.39-0.34 is added, used as a ball plate, a compression roller, and a pressure roller. Formed, made into round particles, massive pieces, clumps. The strength of particles mixed with 20% cement is better than that of