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一、前言大体积混凝土建筑物产生了危害性的裂缝,可用沿缝抽槽然后回填混凝土的处理措施,以恢复和保证建筑物的整体性。这需要研究解决两个问题:爆破抽槽的震动破坏影响及回填胶结的强度。关于第一个问题在《用爆破法在大体积混凝土内抽槽的试验研究》一文中已作详细报导。在第二个问题中,影响回填质量的主要是回填材料的体积变形,其中包括三个部份:温度变形、干缩及自生体积变形。因此,水泥性能的研究选择及回填的施工温度控制是本试验的中心课题。除在室内作了一些材料性能试验外,又在野外的大试件上作了施工控制试验。大试件长18米宽7米高5米,沿长度方向的中央抽挖一条宽2米的直槽,槽的一侧挖有键槽(图1)。试件尺寸及基础的选择,应考虑尽可能接近原型大体积混凝土的边界条件。如果试件浇在火成岩上,试件抽槽回填后,顶面及侧面均采用适当的保温措施。在试件内部及回填接缝面上埋设了观测仪器,又用大口径钻孔骑缝取样进行力学检验。根据所得
I. INTRODUCTION Massive concrete buildings have produced dangerous cracks. They can be dealt with along the slots and then backfilled concrete to restore and ensure the integrity of the buildings. This requires research to solve two problems: the impact of blasting tank vibration damage and backfill cemented strength. The first issue has been covered in detail in the article “Experimental study on pumping of large-volume concrete in blasting by blasting”. In the second question, the main impact on backfill quality is the volume deformation of backfill material, which includes three parts: temperature deformation, shrinkage and autogenous volume deformation. Therefore, the choice of cement performance research and construction temperature control backfill are the central topics of this experiment. In addition to making some material performance test indoors, but also in the field of large test pieces made construction control test. The test specimen is 18 meters long, 7 meters high and 5 meters long. A straight 2-meter-wide straight slot is dug centrally along the length of the test piece. A keyway is dug into one side of the slot (Figure 1). The size of the specimen and the choice of foundation should be considered as close as possible to the boundary conditions of the prototype mass concrete. If the test specimen is poured into igneous rocks, the test specimen shall be backfilled and the appropriate insulation measures shall be taken on the top and the sides. Inside the specimen and backfill seams surface buried observation instruments, but also with large-caliber drilling seam sampling for mechanical testing. Based on the income