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研究了流态高强膨胀混凝土(简称为 FLHSEC)的强度性能、膨胀性能以及强度与膨胀的协调发展性能,考察了流态化条件下高强混凝土中膨胀剂的作用效应及细掺料对其作用效应的影响。研究表明流态高强膨胀混凝土的膨胀行为有其特殊性:在不加磨细矿渣(BFS)时,水养1天出现自收缩,整个硬化过程膨胀受到抑制,原因在于高强流态膨胀混凝土较高的强度、特别是较高的早期强度限制了膨胀的发挥,在混凝土内部存在“自约束效应”。掺加BFS后,未发现自收缩现象,限制膨胀率大于对应的未掺 BFS时的限制膨胀率。BFS的加入使高强膨胀混凝土早期强度降低,膨胀效应得以较充分发挥,有利于补偿高强混凝土的收缩和防止裂缝的出现。强度与膨胀协调发展这一膨胀混凝土的基本规律对于高强流态膨胀混凝土仍然适用,且更为重要。
The strength performance, expansion performance and the coordinated development between strength and expansion of fluidized high-strength concrete (FLHSEC) were studied. The effect of the swelling agent in high-strength concrete under fluidized condition and the effect of fine admixture on it Impact. The results show that the swelling behavior of high-strength fluid-filled expansive concrete has its own peculiarity. When BFS is added, self-shrinking occurs in water for 1 day, and the expansion of the entire hardening process is restrained due to the high strength of the fluidized expansive concrete The strength, especially the higher early strength, limits the expansion, and there is a “self-restraint effect” inside the concrete. After adding BFS, no self-shrinkage phenomenon was found, and the limiting expansion rate was larger than the corresponding limiting expansion rate without BFS. With the addition of BFS, the early strength of high-strength expansive concrete is reduced and the expansion effect is fully exerted, which is good for compensating the shrinkage of high-strength concrete and preventing the occurrence of cracks. Strength and expansion The basic rules of coordinated development of expansive concrete are still applicable to high-strength fluidized expansive concrete, and more important.