Research On High Performance Architectural Concrete And Technology For Construction

High-performance architectural concrete is perfect combination of the high-performance concrete and the architectural concrete, based on in improving the appearance quality of the concrete structures, greatly improving engineering quality and service life. This paper researches the application of high-performance architectural concrete in bridge engineering,having guiding significance for large large-scale infrastructure ( bridge pier, high-rise building )in the future. Based on the high-performance architectural concrete construction of the bridge engineering required in the high-performance, decorative effect and the construction technology and so on, this article has conducted the following study:(1) By the study of polycarboxylate superplasticizer used in high-performance architectural concrete, we adjust the gas-solid, gas-liquid interface of polycarboxylate admixture product ,and improve the quality of the bubble (to reduce the instability of large bubbles, increase stability small bubbles). The optimal compounding programs of superplasticizer are polycarboxylate liquor :defoaming agent :air entraining agent=4:0.02:0.03, proposed to improve workability, durability, appearance quality of concrete, which meets the performance requirements of architectural concrete.(2) Through high-density mix design methods to optimize the design of high-performance architectural concrete, when the amount of cementitious material reaches to 440kg/m3 ,the water-cement ratio is 0.32 and the content of fly ash form 0~60%, The results are as follows: anti-penetration level of concrete is higher than P30; 28d age carbonation is very weak; frost resistance test mass loss are within 1%, durability factor is greater than 0.8 after 300 freeze-thaw, mass loss of concrete is less than 2% by 28 cycles while testing resistance to sulfate attack capability; strength loss is less than 10%; 28d flux is less than 1000C. Concrete shows a low permeability and good resistance to chloride ion penetration.Proportion of mixture of high-performance architectural concrete used for the construction not only can meet the appearance requirements of architectural concrete, but also meet the engineering construction required working performance, mechanical properties and durability. (3) This paper studies the treatment process of architectural concrete formwork systematically, first proposed by acrylic plate and PVC film template process. Through technical and economic comparative analysis of a variety of templates treatment process, we optimize the treatment process of fair-faced concrete formwork , which is economic, feasible, simple operation, less damage to formwork, effective in anti-foaming, and the appearance of concrete to meet the quality requirements of architectural concrete.(4)The high-performance architectural concrete successfully used in actual engineering -- Zhudao Bridge, formed the system of high-performance architectural concrete construction technology.