本文介绍了膨胀混凝土灌注桩和灌注桩膨胀剂的发展过程。研究了一种新型灌注桩混凝土膨胀剂HCSA-P,并对其性能进行了较为系统的试验研究,在工程中使用了这种膨胀剂。工程效果表明,夯扩桩采用膨胀混凝土技术,承载力达到了夯扩后注浆桩的水平,但是施工工艺大幅度简化,成本显著降低;摩擦桩采用膨胀混凝土技术,同级别荷载下,沉降量仅为普通混凝土桩的36%~44%。 This article describes the development process of expansive agent for expansive concrete bored pile and bored pile. A new type of concrete expansive agent HCFC-P was researched. Its properties were systematically studied and studied. The expansive agent was used in the project. The engineering results show that the expanded concrete piles are expanded concrete, the bearing capacity reaches the level of the grouting piles after the expansion, but the construction technology is simplified greatly and the cost is significantly reduced. The friction piles adopt the technology of expansive concrete. Under the same level load, the settlement It is only 36% ~ 44% of ordinary concrete piles.