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为了适应丹江口大坝补强工程需要,长办和丹江口工程局于1964年共同进行了预填骨料压浆混凝土试验。试验任务为:掌握砂浆流动度,主要是砂浆级配与外加剂的用量;掌握骨料填筑的均匀性,主要是骨料级配及填筑方法;掌握灌浆的操作工艺,主要是进浆管的操作。针对以上问题,室内试验主要是研究行浆条件,选择合宜的砂浆级配及骨料级配。室外试验主要是通过大型试件探讨有关工艺问题,并研究压浆混凝土的力学性能以及压浆混凝土同老混凝土的接合性能。一、材料特性的研究粗骨料:压浆混凝土对粗骨料的要求与一般混凝土基本相同。骨料级配原则,是使混合后的空隙率既便于进浆又能节省水泥用量。根据工地的骨料生产条件,经比较选用了8～12和2～4厘米两级间断级配,空隙率33％左右。砂子:砂子的粒径、级配及浑园度对砂浆特性
In order to meet the Danjiangkou dam reinforcement project needs, long Office and Danjiangkou Engineering Bureau jointly conducted in 1964 pre-grouting grout concrete test. The test tasks are: to master the fluidity of mortar, mainly the amount of mortar grading and admixture; grasping the uniformity of aggregate filling, mainly graded aggregate and filling method; Grasp the grouting operation process, mainly into the pulp Tube operation. In response to the above problems, laboratory tests are mainly to study the slurry conditions, select the appropriate mortar gradation and aggregate gradation. Outdoor tests mainly through the large-scale specimen to explore the process of problems, and study the mechanical properties of grouted concrete and grout mixed with the old concrete concrete performance. First, the study of material properties Coarse aggregate: grout concrete on the coarse aggregate requirements and general concrete is basically the same. Aggregate grading principle is to make the mixed porosity is easy to enter the pulp and can save the amount of cement. According to the site of aggregate production conditions, the choice of 8 to 12 and 2 to 4 cm two interrupted grading, porosity of about 33%. Sand: sand particle size, grading and muddy degree of mortar characteristics