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Wan'anxi concrete face rockfill dam and its characteristics

Fruit. 6.2.1 Optimization of concrete mix, significantly improve the crack resistance of concrete mix and the performance test panel studies, originally Beijing-based Water Resources and Hydropower Research efforts by all parties concerned, after I assume, by laboratory experiments preferred base rate of 6 ratio, from No. 9 in 1994, never power generation 15 Water Resources and Hydropower Survey and Design Institute of Fujian Province adjustment review, which recommended that the 2 species. Longyan cement concrete selection panel 425 produced early strength Portland cement, the design label 250 to ensure the rate of 90 series from the poor efficiency of 0.18, the preparation of concrete grade 325, water-cement ratio of 0.39 ~ 0 .40, slump d0 ~ 60ram,[link widoczny dla zalogowanych], gas content 4 to 5. Using three composite admixture (superplasticizer FE, air-entraining Jing DHa, wood decorated calcium coagulant), amount of fly ash mixed with high-quality (part of the place of cement, part of the place of fine sand). Although we use an ultra efficient standard fineness modulus of 3. d ± 0.2 coarse river sand. Preparation and character are still well out of the concrete panels to ensure the delivery and placement process is not isolated, not Lu the water, significantly improve the crack resistance of concrete. B. 2.2 The panel with the power stage stage pouring water power requirements, 355m elevation in the panel for a construction joint. Longitudinal reinforcement through the construction joint, a joint reserve groove surface, the second slot embedded in the concrete pouring 20ramX10mm hydrazine, seal paste the cracks, water volume, after its expansion, construction joints and around the block pores. Reliable and impervious to the purpose. The construction joints may also help reduce the panel cracks. 8.2.3 concrete pouring process and quality control of concrete mixing system a panel arranged in the 337m elevation of the dam surface, the transport distance is short,[link widoczny dla zalogowanych], effective control of concrete quality. Xi Wang concrete pouring after extrusion molding,[link widoczny dla zalogowanych], which covers agricultural film insulation, moisture, exposed after the initial setting than film, covering straw bags, continuous maintenance to the water sprinkler. Concrete placement arrangement 2 ~ 3 months in early spring, when the continuous rain,[link widoczny dla zalogowanych], high humidity and suitable temperature, the objective of nature conservation play a role in the growth of the concrete in the strength of the best state. Wan'anxi a total of 15 panels,[link widoczny dla zalogowanych], the maximum length of a single block of 100m, after inspection found no cracks. B. 3 panel design panel jointing and sealing construction in two phases. Horizontal construction joints by pouring seam treatment, vertical joint spacing both 12m and 6m, the panel is divided into 23 sections. According to the role and requirements of different joints. Panel joints are mainly three forms: (1) tensile joints (A-type seam) left bank 6, the right bank of seven, with two sealing, slit the bottom of the set up of a copper seal, seam side brushing emulsified asphalt, caulking sealing surface of the plastic filling material, and cover with plastic film protection (2) pressure of the joint (B-type seam) site located in the riverbed g Ru, set a copper bottom seam sealing, seam side of brushing Polo L Asphalt I (3) panel and the toe plate located between the three peripheral joint sealing, sealing the end of all copper, with a central T shape the dirty surface, filling plastic caulking materials, and cover with plastic film protection. Seal the joints during the construction of small square of wood with simple pad retaining basically no damage. 1 Conclusion (1) concrete face rockfill dam without reservoir vent tunnel junction is feasible. Panel structure is becoming more perfect, generally does not require venting panel in reservoir maintenance treatment, if necessary, by divers to identify and take cast soil treatment. Brazil's recent construction of three ultra-meter high dam located neither vent tunnel. (2) a good hard granite rockfill dam is one of the materials, make full use of joint distribution yard occurrence, to play a blast effect and to take supplementary measures to overcome the disadvantage of hard rock, blasting out the good dam graded material. (3) mixed with decomposed granite sand bedding material physical and mechanical and water can be good reason to meet their power transmission structure and permeability as a second line of defense requirements, and significant economic benefits for the cushion material and take full advantage of the source material local materials opens up new avenues. (4) The shrinkage-compensating concrete plinth of concrete is an effective way to cancel the expansion joint. (5) Wan'anxi a concrete slab of good quality. Has not found any cracks, this is serious lessons \

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