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这个论文试图解决混凝土在持续高温(75℃～600℃)情况下机械性能的变化。用普通硅酸盐水泥,普通硅酸盐水泥和风冷高矿渣,普通硅酸盐水泥和粉煤灰配成三种类型的混凝土。水灰比和水与胶凝材料之比为0.45～0.60.采用石灰岩碎石和天然砂为粗细集料。混凝土试块置于75—600℃高温下八个月。试块在高温试验前要经湿养护二八天之后,再放在室内至少存放16个星期。试验结果说明,高矿渣和粉煤灰代替部分水泥,对混凝土在持续高温情况下的机械性能一般讲没有什么改进。混凝土性能变化主要在第一个月期间。在持续高温150℃混凝土遭到严重破坏,据原因是由于粗集料颗粒在此高温下不稳定造成的。
This dissertation attempts to solve the change in mechanical properties of concrete at constant high temperatures (75°C to 600°C). Ordinary portland cement, ordinary portland cement and air-cooled high slag, ordinary portland cement and fly ash into three types of concrete. The ratio of water to cement and water to cementitious material is 0.45 to 0.60. Limestone gravel and natural sand are used as coarse and fine aggregates. The concrete test block was placed at a high temperature of 75-600°C for eight months. The test block should be wet cured for 28 days before the high temperature test, and then stored in the room for at least 16 weeks. The test results show that high slag and fly ash replace part of the cement and there is generally no improvement in the mechanical properties of concrete under continuous high temperatures. Changes in concrete properties are mainly during the first month. The concrete was severely damaged at a constant high temperature of 150°C, due to the instability of the coarse aggregate particles at this high temperature.