预应力混凝土灌浆料选择怎么选 ?

2025-04-02 08:45:07
推荐回答(1个)
回答1:

如何选择型号正确的灌浆料 在灌浆料的使用过程中大多会出现这样的问题,过分追求工程进度,养护不充 分, 使用方法不正确, 加水量太多导致强度上的慢, 追求早期强度等方面的问题。 在使用灌浆料时,灌浆料的型号比较多,有普通型的,早强型的区别,但是在购 买时,用户不向厂家说明施工情况,不说明施工部位,要求不够准确。一般灌浆 料都属于高强无收缩的, 但是上强度的时间都是不一样的,所以灌浆料的型号也 都是不一样的。但是当施工企业使用后,发现灌浆料并不是属于早期强度高的, 凝固的速度也并不快, 这时候, 就有人会想到加一些混凝土早强剂的产品作为加 快凝固的速度的方法。 对于混凝土早强剂, 分类比较多, 有缓凝型的早强剂, 促凝型的早强剂, 水泥制品用的早强剂,水泥与黏土凝结用的早强剂,建筑防冻用的早强剂,这些 类型的早强剂中的原材料组成不同,添加到灌浆料中后,很容易与灌浆料中添加 的有机化学材料发生化学反应, 从而影响正常的使用。加入不适合的早强剂成分 后,灌浆料容易出现开裂的现象,在侵蚀性的环境下劣化更加迅速。 一些施工人员过度的追求快速凝固,高强早强,要求一个小时内达到 15Mpa 的抗压强度是很难达到这个数值的。对结构的耐久性造成很大的影响,损 害了灌浆料表层的密实性和强度, 而防止钢筋发生锈蚀和外界有害物质侵入基体 内部所依靠的就是表层的密实性。 新拌浆体中存在着大量均匀分布的毛细孔,其中充满水,使水泥进一步 进行水化作用,使大孔变成小孔增加整体的密实度。因毛细孔是相通的,如外界 环境湿度低,毛细孔水会向外蒸发,减少了供给水化的水量。如果环境湿度大或 继续放在水中,则可通过毛细管向外补给水化用水,性能就能不断提高。在干旱 多风天气,毛细孔水迅速蒸发,水泥不仅因缺水而停止水化作用,还会因毛细管 引力作用在混凝土中引起收缩。 此时灌浆料的强度还很低,收缩引起的拉应力很 快使其开裂,破坏混凝土结构,造成质量事故。因此必须要及时养护。

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