矿渣水泥抗渗结构.docVIP

矿渣水泥抗渗结构 水泥水化过程中产生大量的热量，每立方米砼将放出17500～27500kJ的热量，砼内部温度升高30℃左右，—般在1～3d即释放50%以上热能。在高层建筑、桥梁、地铁等工程中被广泛应用。但由于泵送混凝土本身的工艺特点及施工工艺等原因，泵送砼施工的工程往往会出现一些裂缝，其在很大程度上影响结构的抗渗和耐久性能。 Cement hydration process produce a lot of heat, per cubic meter of concrete will emit heat of 17500 ~ 27500 kj, concrete internal temperature 30 ℃ or so and - as in 1 ~ 3 d the release of more than 50% of heat energy. In high-rise buildings, Bridges, subway and so on are widely used in engineering. But as a result of pumping concrete itself, process characteristics and construction technology of pumping concrete construction projects often appeared some cracks, largely affect the impermeability and durability of the structure. 为满足泵送要求粗骨料粒径往往较小，碎石不宜大于1：3，卵石不宜大于1：2.5，泵送砼的石子粒径不得大于泵送管道直径的1/4；为保证砼的流动性、粘聚性和保水性及便于运输、泵送和浇筑，泵送砼的砂率要比普通砼流动性大，约为38％～45％；通过0.315筛孔的砂不应小于15％； To meet the requirements of pumping coarse aggregate size often smaller, gravel should not be greater than 1:3, pebble should not be greater than 1:2. 5, pumping concrete stones size shall not be greater than 1/4 of pumping pipe diameter; In order to ensure the liquidity of concrete, adhesiveness and water retention and facilitate transportation, pumping and pouring, pumping concrete sand ratio than ordinary concrete fluidity big, about 38% ~ 38%; Through 0.315 mesh sand shall not be less than 15%; 有工艺简单、施工速度快、适用范围广、占用场地小、操作便捷、大大降低劳动强度等优点，泵送砼是施工技术进步发展而来的一项施工技术，它可一次连续完成水平运输和垂直运输，并可连续浇筑，为保证砼具有良好的可泵性，强度等级为C20～C60的砼中水泥用量一般为350～550kg/m3；最小水泥用量宜为300kg/m3； Has simple process, fast construction speed, wide applicable range, small occupied space, convenient operation, greatly reduce the labor intensity, pumping concrete construction technology is progress of a construction technique, it can complete a continuous horizontal transport and vertical transport, and can continuous casting, in order to ensure the concrete has good pumpability, strength grade of C20 ~ C60 concrete cement dosage in general is 350 ~ 550 kg/m3; Minimum cement dosage should