摘 要：对普通混凝土（NC）、再生混凝土（RAC）、钢纤维混凝土（SFRC）和钢纤维再生混凝土（SFRRAC）的弯曲疲劳性能进行了试验研究。分析了应力水平、再生骨料和钢纤维对混凝土弯曲疲劳寿命和离散性的影响规律。在试验研究的基础上，应用疲劳寿命统计学理论拟合了各组混凝土材料弯曲疲劳寿命的两参数威布尔分布,并建立了相应的单对数和双对数弯曲疲劳方程。结果表明，再生混凝土的疲劳寿命明显低于天然骨料混凝土，离散性也更大；钢纤维可以显著提高混凝土的疲劳寿命，并降低离散性。各组混凝土材料的弯曲疲劳寿命很好地服从两参数的威布尔分布；建立的单对数和双对数弯曲疲劳方程与试验实测数据吻合良好。 Abstract: The experimental research on the flexural fatigue properties of normal concrete (NC), recycled aggregate concrete (RAC), steel fiber reinforced concrete (SFRC) and steel fiber reinforced recycled aggregate concrete (SFRRAC) is carried out. The influence rules of stress level, recycled aggregate and steel fiber on fatigue life and discreteness are analyzed. Based on the experimental studies, two-parameter Weibull distribution of flexural fatigue life of concrete is derived by using statistics theory, and the corresponding single logarithmic and double logarithmic equations are gained. The experiment results show that flexural fatigue life of recycled aggregate concrete is obviously lower than that of natural aggregate concrete, and the discreteness is greater; steel fiber can significantly improve the flexural fatigue life of concrete and decrease the discreteness. The flexural fatigue life of concrete materials follows two-parameter Weibull distribution; experimental single logarithmic and double logarithmic equations can describe the experimental test data well.

摘  要：以磷渣-粉煤灰复合辅助性胶凝材料为对象，研究了不同磷渣掺量对低等级粉煤灰的需水量比、活性指数以及与减水剂适应性的影响，并利用XRD，SEM，TG等测试手段探究磷渣-粉煤灰-水泥体系的相互作用机理。结果表明，磷渣的掺入有助于降低粉煤灰需水量比、提高粉煤灰的活性指数，改善与外加剂的适应性，磷渣-粉煤灰-水泥体系的水化产物主要包含Ca（OH）2、AFt、CaCO3、C-S-H凝胶。Abstract:Takingthephosphorusslag-flyashcompositeauxiliarycementitiousmaterialsasanobject,theinfluencesofdifferentphosphorusslagcontentonwaterdemandratio,activityindexoflowgrandflyashandthecompatibilityofsuperplasticizerarestudied,besides,theinteractionmechanismofphosphorusslag-flyash-cementcompositebindingmaterialsisdiscussedbyusingXRD，SEM，TG.Theresultsshowthat,addingphosphorusslagcandecreasethewaterdemandratioofflyashwhichcanincreaseactivityindexofflyash,andimprovethecompatibilityofsuperplasticizer.Hydrationproductsofphosphorusslag-flyash-cementcompositebindingmaterialsmainlyincludeCa(OH)2、AFt、CaCO3andC-S-Hgel.

摘 要：结合白浪河大桥及摩天轮工程的斜腿施工工程实例，从施工工艺及BIM软件模拟方面，运用理论与实践相结合的施工方法及项目管理理念，对白浪河大桥及摩天轮工程的斜腿施工工艺进行了论述，并总结了桥轮合一的情况下大型异形混凝土分层浇筑的施工方法。 Abstract: Combination with legs construction engineering project for Bailang river bridge and Ferris wheel project, from construction technology to BIM software simulation, construction method and project management concepts are used with theory and practice, legs construction technology for Bailang river bridge and Ferris wheel project is discussed, construction method of large special-shape layered pouring is summarized under the situation of bridge-round.

摘 要：为提高桥梁伸缩缝的使用寿命，解决伸缩缝破损快速修复的问题，提出了一种高延性纤维增强水泥基复合材料(PVA-ECC)。室内试验结果表明，PVA-ECC具有良好的抗弯性能、抗拉性能、抗渗性能、抗冻性能，对伸缩缝常见病害有良好的预防及修复效果且施工简便，养护时间短。 Abstract: In order to improve the service life of bridge expansion joints and solve the problem of rapid repairing for damage of expansion joints, a high ductility fiber reinforced cementitious composites (PVA-ECC) is proposed. Laboratory test results show that, PVA-ECC has good flexural performance, tensile properties, permeability resistance, frost resistance performance, which has good prevention and repairing effect for common disease of expansion joints, PVA-ECC is easy to construct and maintenance time is short.

摘 要：研究了轻质泡沫混凝土在不同密度下的抗压强度和导热性能。结果表明，抗压强度和导热系数均随着干密度的增大而增大；建立了抗压强度和导热系数与干密度的非线性本构关系，可为泡沫混凝土用于建筑保温系统提供理论参考。 Abstract: The compressive strength and thermal conductivity of lightweight foam concrete under different density is studied. The results show that, compressive strength and thermal conductivity are increased with the increasing of dry density; nonlinear constitutive relation for dry density with compressive strength and thermal conductivity are established, which can provide a theoretical reference to foamed concrete for building insulation system.

摘  要：通过正交试验，研究了胶凝材料用量、钢铁渣粉掺量、外加剂掺量和砂率对混凝土性能的影响。结果表明，钢铁渣粉的掺入会延长混凝土凝结时间和降低早期强度，但对后期强度影响不大，可通过适当提高胶凝材料用量、外加剂掺量和砂率进行优化，当胶凝材料用量为340kg/m3、370kg/m3，钢铁渣粉掺量为20%，外加剂掺量为0.6%，砂率为40%时，混凝土工作性能和力学性能均满足PC构件生产要求，可为预制构件中钢铁渣粉的大规模推广应用提供技术支撑。Abstract:Throughorthogonalexperiments,theinfluenceofcementitiouscontent,steelslagpowderdosage,admixturecontentandsandratioonpropertiesofconcreteisstudied.Theresultsshowthat,addingsteelslagpowdercanextendthesettingtimeofconcreteanddecreaseearlystrengthofconcrete,whichhaslittleinfluenceonlatestrengthofconcrete,theoptimizationiscarriedoutbyincreasingamountofcementitiousmaterials,admixturedosageandsandrate,whenamountofthecementitiousmaterialsis340kg/m3and370kg/m3,thedosageofsteelslagpowderis20%,thedosageofadmixtureis0.6%,andsandratiois40%,theworkabilityandmechanical performanceofconcretecanmeettheproductionrequirementofprefabricateconcrete,whichcanprovidetechnicalsupportforlarge-scaleapplicationofsteelslagpowderinprefabricatedcomponents.