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以往我们在配制混凝土时,拌和用水量是按理论用水量减去粗细集料含水量来确定的,拌制结果,混凝土的流动性往往达不到设计要求,坍落度相差5厘米左右。为使坍落度达到设计要求,每立方米混合料需增加约15公斤的水(保持水灰比不变)才行。这样配制的混凝土,其28天抗压强度较大幅度地超过了原设计标号。在试验室小试样试拌
In the past, when we were preparing concrete, the mixing water consumption was determined by subtracting the water content of the coarse aggregate from the theoretical water consumption. As a result of the mixing, the fluidity of the concrete often failed to meet the design requirements, and the slump difference was about 5 cm. In order to meet the design requirements for slump, an additional 15 kilograms of water per cubic metre of mix is required (keeping the water-cement ratio constant). The concrete thus prepared had a 28-day compressive strength that greatly exceeded the original design number. In the laboratory small sample test mix