回填微膨胀自密实混凝土配制及单轴膨胀试验
发布时间：2018-07-31 18:44
【摘要】：某水电站采用平压水箱平衡蜗壳内水压力,虽已安全运行了数十年,但水箱内产生了严重锈蚀,检修条件困难,存在安全隐患。为研究回填微膨胀自密实混凝土替代水箱方案的可行性,开展了回填微膨胀自密实混凝土的配制及其单轴膨胀模拟试验研究。根据替代方案的设计要求,回填微膨胀自密实混凝土应具有合适的膨胀量,无需振捣即可将水箱充填密实。采用工程当地原材料,通过拌和物性能试验及水胶比-强度试验,确定了水胶比、砂率等混凝土配合比参数。通过限制膨胀试验和模拟单轴膨胀试验研究了膨胀剂掺量与变形的关系。提出的微膨胀自密实混凝土流变参数在合理范围以内。提出的回填低热微膨胀自密实混凝土配合比及单轴膨胀模拟试验方法可供相关研究和工程参考。
[Abstract]:Although a hydropower station has used a water tank to balance the water pressure in a volute case, although it has been running safely for decades, serious corrosion has occurred in the tank, the condition of maintenance is difficult, and there is a hidden danger of safety. In order to study the feasibility of backfill micro-expansion self-compacting concrete substitute water tank, the preparation of backfill micro-expansion self-compacting concrete and its uniaxial expansion simulation test were carried out. According to the design requirements of the alternative scheme, the backfill micro-expansion self-compacting concrete should have an appropriate expansion amount, and the water tank can be filled with compaction without vibration. By using the local raw materials, the concrete mixture ratio parameters, such as water-binder ratio and sand ratio, were determined by mixing material performance test and water-binder ratio to strength test. The relationship between the amount of expansive agent and deformation was studied by limiting expansion test and simulating uniaxial expansion test. The rheological parameters of micro-expansion self-compacting concrete are within a reasonable range. The mixture ratio and uniaxial expansion simulation test method of backfill low-heat micro-expansion self-compacting concrete can be used as reference for relevant research and engineering.
【作者单位】： 南京水利科学研究院水文水资源与水利工程科学国家重点实验室;
【基金】：水利部公益性行业科研专项资金项目(201301052)
【分类号】：TU528.55
[Abstract]:Although a hydropower station has used a water tank to balance the water pressure in a volute case, although it has been running safely for decades, serious corrosion has occurred in the tank, the condition of maintenance is difficult, and there is a hidden danger of safety. In order to study the feasibility of backfill micro-expansion self-compacting concrete substitute water tank, the preparation of backfill micro-expansion self-compacting concrete and its uniaxial expansion simulation test were carried out. According to the design requirements of the alternative scheme, the backfill micro-expansion self-compacting concrete should have an appropriate expansion amount, and the water tank can be filled with compaction without vibration. By using the local raw materials, the concrete mixture ratio parameters, such as water-binder ratio and sand ratio, were determined by mixing material performance test and water-binder ratio to strength test. The relationship between the amount of expansive agent and deformation was studied by limiting expansion test and simulating uniaxial expansion test. The rheological parameters of micro-expansion self-compacting concrete are within a reasonable range. The mixture ratio and uniaxial expansion simulation test method of backfill low-heat micro-expansion self-compacting concrete can be used as reference for relevant research and engineering.
【作者单位】： 南京水利科学研究院水文水资源与水利工程科学国家重点实验室;
【基金】：水利部公益性行业科研专项资金项目(201301052)
【分类号】：TU528.55
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