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首页> 外文期刊>Magazine of Concrete Research >Self-flowing underwater concrete mixtures
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Self-flowing underwater concrete mixtures

机译：自流水下混凝土混合物

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The placement of conventional concrete mixtures in underwater construction results in a high percentage of material loss owing to washout of cement paste. The current paper presents the influence of antiwashout admixture (AWA) on various properties of concrete. Eleven self-flowing concrete (SFC) mixtures using type II cement were proportioned. A combination of low water-cement (w/c), high cement contents, AWAs, fly ash and silica fume were used to enhance the resistance of fresh concrete to washout. The concrete mixtures were proportioned to be highly flowable, self-levelling and cohesive. The w/c materials ratios ranged between 0.35 and 0.39, which corresponds to a typical underwater concrete mixture. The concrete mixtures were tested for slump, slump flow, washout resistance and compressive strength. The compressive strength of each concrete mixture cast under water was determined at 3, 7 and 28 days and compared with the compressive strength of the same concrete mixture cast under normal conditions (in air). Test results indicated that the use of an AWA facilitates the production of flowable concrete mixtures with the added benefit of lower washout loss. Concrete mixture proportioned using type II cement and fly ash at a 15% level of replacement was found to develop SFC that had better fresh and hardened properties and was more resistant to washout. The self-flowing underwater concretes developed 28-day compressive strengths ranging from 20 to 28 MPa.
机译：常规混凝土混合物在水下施工中的放置会导致高比例的材料损失，这归因于水泥浆的冲刷。本文介绍了抗冲蚀外加剂（AWA）对混凝土各种性能的影响。使用II型水泥混合了11种自流混凝土（SFC）混合物。低水灰比（w / c），高水泥含量，AWA，粉煤灰和硅灰的组合被用于增强新鲜混凝土的耐冲刷性。按比例混合混凝土，使其具有高流动性，自流平性和粘结性。 w / c材料比在0.35至0.39之间，这对应于典型的水下混凝土混合物。测试混凝土混合物的坍落度，坍落度流动，耐冲刷性和抗压强度。确定在水下3、7和28天浇铸的每种混凝土混合物的抗压强度，并将其与在正常条件下（在空气中）浇铸的相同混凝土混合物的抗压强度进行比较。测试结果表明，使用AWA有助于生产可流动的混凝土混合物，并具有降低冲刷损失的额外好处。已发现使用II型水泥和粉煤灰按15％的替代比例配比的混凝土混合物所开发的SFC具有更好的新鲜性和硬化性，并且更耐冲洗。自流水下混凝土的28天抗压强度范围为20到28 MPa。

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