| 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。 |
| 关键词: 回填 微膨胀 自密实混凝土 混凝土配制 流变性能 单轴膨胀 |
| DOI： |
| 分类号:TU528.55 |
| 基金项目:水利部公益性行业科研专项资金项目（201301052） |
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| Experimental studies on preparation and uniaxial expansion simulation of back fill micro expansive self compacting concrete(SCC) |
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LIU Wei-bao, LU Cai-rong, WANG Heng, MEI Guo-xing, GE Xue-liang, YANG Hu
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State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering， Nanjing Hydraulic Research Institute
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| Abstract: |
| Pressure-balanced water tank is applied to balance the water pressure in concrete volute at a hydroelectric power station which has operated safely for decades. However， corrosion occurred in the tanks in these years. It is too difficult to repair and there is a safety problem in the power station. In order to study the feasibility of backfilling micro-expansion SCC as substitution for pressure water， experiments of preparation and performance have been carried out according to the design requirements. By adopting the site raw materials， mix parameters such as water-cement ratio and sand rate are determined by a series of fresh concrete tests and strength tests. The relationships between the dosage of swelling agent and deformation of concrete have been studied by restricted expansion experiments， autogenous volume deformation tests and uniaxial expansion experiments. The filling ability of this type of SCC is verified by rheological experiments and a simulative self-filling test. The mix proportion and the performance of backfilling micro-expansion SCC can provide a reference for relative researches and similar works of hydraulic engineering. |
| Key words: back fill micro expansion self compacting concrete(SCC) concrete preparation rheological properties uniaxial expansion |
