掺合料和纤维对泡沫轻质混凝土干缩性能的影响

发布时间：2018-05-29 11:26

本文选题：工程材料 + 干缩性能　；参考：《铁道建筑》2017年12期

【摘要】：以普通硅酸盐水泥为胶凝材料,采用物理发泡技术制备泡沫轻质混凝土试样进行干缩试验,探讨玻璃纤维、粉煤灰、硅粉等外加剂对其干缩的抑制效果。结果表明:不同湿密度泡沫轻质混凝土的干缩值均随着龄期的增长而增大,早期干缩值增长较快,后期趋于稳定;随湿密度的增大,泡沫轻质混凝土的干缩值逐渐减小;玻璃纤维能显著抑制泡沫轻质混凝土的干缩;在合适掺量范围内,粉煤灰或硅粉能在一定程度上减小泡沫轻质混凝土的干缩,但掺量过大会对干缩产生不利影响。
[Abstract]:The dry shrinkage test of light foamed concrete samples prepared by physical foaming technology was carried out with ordinary Portland cement as the cementing material. The effect of additives such as glass fiber, fly ash and silica fume on the dry shrinkage was discussed. The results show that the dry shrinkage value of foamed lightweight concrete with different wet density increases with the increase of age, the dry shrinkage value of foamed lightweight concrete increases rapidly in the early stage and tends to be stable at the later stage, and the dry shrinkage value of light foamed concrete decreases gradually with the increase of wet density. The dry shrinkage of light foamed concrete can be significantly inhibited by glass fiber, and the dry shrinkage of light foamed concrete can be reduced to a certain extent by fly ash or silica fume within the proper range of content, but the dry shrinkage can be adversely affected by the addition of glass fiber.
【作者单位】：中铁第四勘察设计院集团有限公司;
【分类号】：TU528

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