摘 要：结合郴宁高速公路建设和施工实践过程中出现的裂缝问题，阐述了混凝土裂缝的种类和成因，并针对具体问题从原材料选用到施工过程控制提出了相应的防治与处理措施。 Abstract： Combining with the concrete cracks problems in construction and practical process in Chenzhou-Ningyuan Expressway, types and causes of concrete cracks are presented, and the corresponding preventions and measurements in actual constructions, including selection of raw materials and control of construction process, are offered.

摘 要：介绍了工程项目中CF60泵送混凝土的生产与应用经验。在如何控制水泥用量、降低混凝土水化热、保证钢纤维均匀分布等方面进行了探索和研究，解决了在较长运距和较高钢纤维掺量情况下，如何控制坍落度，保证混凝土工作性的问题。 Abstract:：Production and application experience of CF60 pumping concrete for a project are introduced. The controlling cement amount, decreasing hydration heat of concrete, distribution of steel fibre concrete and other fields are discovered and researched, and the problems of controlling the slump and keeping workability of concrete are solved under the situation in long transport distance and high dosage of steel fibre.

摘 要： 以新建珠江大桥为例，介绍了该桥深水双壁钢围堰施工的关键技术。结合主桥22#和23#桥墩的不同地质条件，采用不同的施工工序，降低了施工难度，保证了施工质量。 Abstract：The key technology of the deep double-wall steel cofferdam construction of new Zhujiang River Bridge is introduced. Combining with the different geological conditions of the main bridge pier 22# and 23#, different construction sequences are used and the difficulties of construction are reduced, which can ensure the construction quality.

摘 要：在现有结构体系的基础上，提出了一种利用结构混凝土保护层制作与其厚度相仿的新型免拆卸水泥复合模板，在施工过程中，作为结构混凝土的一部分，形成永久性模板。介绍了该模板的组成材料、构造及模板质量。并对板底混凝土-免拆卸水泥复合模板体系进行了不同荷载作用的受力分析，结果表明，免拆卸复合水泥模板与试件粘结牢固。 Abstract: Based on current structure system, a new type of cementitious composite material formwork without being removed prepared by configuration concrete cover is put forward for substituting traditional concrete cover. It is regarded as a part of the configuration concrete during the process of construction and to form a permanent formwork. The composing materials, constitution and quality of new formwork without being removed are introduced, and mechanical analysis is made under different loading in the system of concrete of broad bottom and new formwork without being removed. The results show that the interface is hard felted between formwork and configuration concrete.

摘 要：研究了纳米凹土、沸石与聚合物以一定配比复合后对防水砂浆凝结时间、抗压、抗折强度、粘结强度以及抗渗压力的影响。结果表明，单掺沸石8%、10%时，对聚合物防水砂浆的性能改善效果最佳。 Abstract: The influences of nano-attapulgite clay, zeolite and polymer mixed with special proportion on coagulation time, compressive strength, flexural strength, bonding strength and permeability stress of the waterproof mortar are researched. The results show that when zeolite content is 8% and 10%，the properties of polymer waterproof mortar are improved to the optimum effect.

摘 要：通过对玻化微珠保温混凝土轴心抗压强度与立方体抗压强度的测定，分析了棱柱体的破坏特征及应力—应变全曲线，并回归了玻化微珠保温混凝土的轴心抗压强度与立方体抗压强度的关系式和峰值应变公式，为进一步研究玻化微珠保温混凝土以及采用该混凝土进行结构设计提供了理论和参考依据。 Abstract: Through determining the axial compressive strength and cube compressive strength of thermal insulation glazed hollow bead concrete, damage characteristics and stress-strain curves of prism are analyzed, and the relationship between the axial compressive strength of thermal insulation glazed hollow bead concrete and cube compressive strength and the formula of peak stress are returned, which provides the theory and reference for the further study of thermal insulation glazed hollow bead concrete and structural design using this concrete.