An expansive concrete pile and its manufacturing method and a concrete expansive agent, which belongs to the concrete pile foundation engineering materials and construction technology, the method is in the pile hole alternately pouring concrete and expansive concrete, I pile forming bamboo; expansive concrete pile end grouting pile in the pile, or I the formation of II type or III type pile pile. The invention of the expansive agent is composed of 40 ~ 80% and 20 ~ 60% of the limestone gypsum grinding together, in the rotary kiln with 1300 ~ 1500 degrees high temperature calcination, then the calcined material according to the weight of 20 ~ 80% and 20 ~ calcium sulphoaluminate cement or alum stone or calcium aluminate cement or its mixture together 80% the powder grinding surface area to 150 ~ 400m2/kg. The invention can remarkably reduce the cost of the expansion concrete filling pile, and obviously increase the bearing capacity of the single pile with the ordinary concrete filling pile.
【技术实现步骤摘要】
【技术保护点】
1.一种膨胀混凝土灌注桩的制造方法,其特征在于:在灌注桩孔中,依次交替浇筑普通混凝土和膨胀混凝土,每层混凝土的浇筑高度不小于1000mm,浇筑后经3~14天形成竹节状结构桩体,该结构膨胀混凝土灌注桩称为I型桩。
【技术特征摘要】
【专利技术属性】
技术研发人员:赵顺增,刘立,
申请(专利权)人:中国建筑材料科学研究总院,
类型:发明
国别省市:11
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