防爆墙施工方案防爆墙施工方案.doc

防爆墙施工方案Blast Wall Construction Program 注意点：墙体边长大于等于100毫米洞口必须预设，不可以开凿。Notice points: when the side length of the wall is greater than or equal to 100mm, the opening must be preset, it is not allowed to excavate. 1 为保证大体积混凝土施工质量，对混凝土的配比进行了详细的研究，选用如下材料： Make a particular research on the properties of concrete to ensure the large area concrete construction quality, and select the following materials: (1)水泥采用云浮银羊P·Ⅱ42．5R普通硅酸盐水泥，以保证水泥质量。Cement uses the ordinary Portland cement of Yunfu silver sheep P·Ⅱ42．5R to ensure the cement quality. (2)粗骨料是混凝土的重要组成，它在混凝土中主要起骨架的作用，并且对胶凝材料的收缩具有一定的抵抗作用。粗骨料采用连续级配好、热膨胀系数较低、强度较高的花岗岩石子，以减少混凝土的收缩及降低水泥用量，石子选用5～25mm连续级配的碎石。其含泥量控制在l％以内，粒径为5-25mm，以满足泵送要求。Coarse aggregate is an important component of the concrete; it plays a skeleton role in concrete, and has certain effect on the shrinkage of gelled material. The coarse aggregate uses the crushed granite with good continuous grading, low CTE, and high strength to decrease the shrinkage of the concrete and the cement usage, the stone uses aggregate with 5～25mm continuous grading. The silt content is limited within 1%, and the grain diameter is 5-25mm to meet the pumpover requirements. (3)细骨料采用不含有机质的中砂，细度模数控制在2．5ram左右，砂子选用高明的Ⅱ区中砂，其含泥量控制在1．2％以内。Fine aggregate uses medium sand without organic matter, the fineness modulus is limited around 2,5ram, and the sand chooses Ⅱzone medium sand, and the silt content is limited within 1.2%. (4)掺合料：掺合料选用珠海电厂的Ⅱ级粉煤灰，粉煤灰是一种活性较好的掺合料，且其水化热远低于水泥，在混凝土中主要超到改善混凝土和易性，降低水化热等作用。可部分取代水泥，从而降低水泥用量，减少混凝土收缩。其掺量为胶凝材料总量的20％。dmixture: the admixture uses Ⅱlevel fly ash of Zhu Hai Power Plant, the fly ash is a admixture with good activity, and its heat of hydration is far below the cement, it plays the role to improve the concrete and workability and decrease the heat of hydration roles in concrete, and could partly replace the cement, thus decreasing the cement usage and concrete shrinkage. Ite mixing amount is 20% of the total cementitious materials. (5)混凝土外加剂：选用广州建筑宝生产的JZB一4型高效缓