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水泥硬化初期,内摩擦较大,以后,由于颗粒间的结合力逐渐增大,因而内摩擦逐渐减小。我们即根据水泥硬化过程中内摩擦的变化来研究水泥石结构的变化。在用共振法研究水泥石结构变化的试验中,采用的是400号矿渣硅酸盐水泥,其矿物组成为:C_3S51.76%;C_2S19.23%;C_3A7.71%;C_4AF17.39%。水灰比为0.30、0.35和0.45的试体,硬化3、7天时,内摩擦较大(图1)。水灰比为0.3、0.35和0.45的试体,是在水中养护了4个月。将这一批八块试体分成两组:4块(1—4)放在(?)+18(±2)℃的
In the initial stage of cement hardening, the internal friction is large, and thereafter, the internal friction gradually decreases as the bonding force between the particles gradually increases. We will study the change of cement stone structure according to the change of internal friction in cement hardening process. In the experiment of studying the structural change of cement stone by resonance method, No. 400 slag portland cement was used, and its mineral composition was: C_3S51.76%; C_2S19.23%; C_3A7.71%; C_4AF17.39%. Samples with a water/cement ratio of 0.30, 0.35, and 0.45 exhibited greater internal friction when cured for 3 or 7 days (Figure 1). Test bodies with a water-cement ratio of 0.3, 0.35, and 0.45 were cured in water for four months. This batch of eight trials was divided into two groups: 4 (1-4) on (?)+18(±2)°C