用微膨胀水泥配制的混凝土,由于硫酸铝与水泥水化时析出的氢氧化钙相结合生成硫酸钙的膨胀,则能抵消混凝土的收缩和产生自应力,使屋面防水层不渗漏。解决了普通混凝土自密性差、收缩变形大、抗拉强度低等因素引起混凝土防水层开裂,屋面渗漏的难题。本文就微膨胀混凝土在苏州建筑的实践谈一些体会。一、工程概况苏州市里河新村60号点式住宅屋面,基层采用预应力混凝土空心板,上加100厚粉 The concrete prepared with the micro-expansion cement, because the aluminum sulfate and calcium hydroxide precipitated during hydration of the cement to generate the expansion of calcium sulfate, can cancel out the contraction of the concrete and generate self-stress, so that the roof waterproof layer does not leak. It solves the problems of ordinary concrete with poor self-tightness, large shrinkage deformation, low tensile strength and other factors that cause concrete waterproof layer cracking and roof leakage. This article talks about the experience of the construction of the slightly expansive concrete in Suzhou. I. Project Overview Point No. 60, Lihexin Village, Suzhou City, Point-type Residential Roof, Prestressed Concrete Hollow Slab at Base, Adding 100 Thick Powder