浅谈客运专线高性能混凝土施工

研究目的：高性能混凝土在铁路客运专线施工中被广泛采用，克服高性能混凝土特点引起的性能缺陷，确保客运专线工程的100年使用寿命。 研究方法：结合武汉天兴洲长江大桥施工中混凝土工程的实际应用，进行高性能混凝土配合比的设计、试配及施工控制，配制出高强度、高耐久性、低徐变、体积稳定性好的高性能混凝土。 研究结果：高性能混凝土配合比设计中，应将胶凝材料用量控制在500kg／m^2以下。配合比中水胶比、砂率、外加剂等因素会对混凝土的强度、和易性、坍落度等不同方面造成影响。 研究结论：选择合理的施工配合比及施工控制措施，使混凝土达到最密实状态，不但有助于降低工程制造成本，提高混凝土强度，而且混凝土内部空隙少，能抵抗外来腐蚀介质的侵入，保护钢筋，大大提高混凝土耐久性，确保工程质量。

Preliminarily Discuss on the Construction of High Performance Concrete in Passenger Dedicated Railway Line

Research purposes: The high performance concrete is widely used in the construction of passenger dedicated railway line.It overcame the performance flaw which was caused by high performance concrete,guaranteed the 100 years service life for passenger dedicated railway line.Research methods:Based on the practical application of high performance concrete in the Wuhan Tianxingzhou Big Bridge project,this paper carried on the high performance proportioning of concrete design,match test and construction control,as so produced the high performance concrete with high durability and strength,slow change and good volume stability.Research results:In the concrete design of high performance proportioning,the gelation material amount should be controlled below 500 kg/m2.The mixture ratio of water and gelation,the granulated rate,additional substance factor,etc.will have the influence on the concrete intensity,mixing,slurry and other different aspects.Research conclusions:Choosing the reasonable construction mix ratio and construction control measure to enable the concrete attain densest condition,which was not only helpful to reduce the project cost and enhance the concrete intensity,but also result to make the concrete small interior crevice to resist the external corrosive medium the invasion,protect the steel bar,greatly enhance the concrete durability, guarantee the project quality.