混凝土桥梁裂缝及其成因分析

通过笔者工程实践总结,针对混凝土桥梁裂缝产生的原因进行详细阐述。主要分析了混凝土桥梁工程中各种裂缝产生的原因,并对针对各种裂缝,归纳了若干修补裂缝的基本方法,对混凝土结构裂缝修补和旧桥加固、改遣具有一定借鉴意义。     

冶金设备大型基础混凝土裂缝的产生原因与控制

分析了混凝土裂缝的产生原因,对混凝土的施工温度与裂缝之间的关系进行了较深入的探讨,提出了混凝土裂缝的预防和控制措施.     

鞍钢1780轧机超大箱型基础裂缝原因及控制对策──鞍钢1780热连轧技改工程跟踪报道之一

导致大体积混凝土裂缝的原因有设计、材料、施工因素等。在分析裂缝产生原因基础上，通过正反两方面的经验教训，提出了控制混凝土裂缝的相应对策。     

浅谈建筑物混凝土裂缝的预防与处理措施

混凝土的裂缝问题是建筑产品施工中一个普遍存在而又难于解决的实际问题,因此对混凝土裂缝的事先预防,以及产生后的处理是建筑生产过程中较普遍的现象.本文对混凝土裂缝这一问题进行了探讨分析,并提出了一些混凝土裂缝的预防和处理措施.     

加热炉混凝土基础施工工艺

结合南京钢铁股份有限公司中板厂加热炉混凝土基础实例,分析了大体积混凝土裂缝形成的原因,从结构设计、材料选择、分层施工、外界环境影响等几个方面提出了混凝土基础裂缝控制措施.     

混凝土路面裂缝原因分析及防控措施

本文对贵溪冶炼厂混凝土路面破坏现象进行深入研究 ,分析了混凝土路面裂缝的原因 ,提出了防控混凝土路面裂缝的措施     

浅谈如何控制超长混凝土水池裂缝

本文介绍了超长水池产生裂缝的主要原因有温差引起的裂缝、混凝土的收缩、水化热、施工质量差、混凝土的保养；针对这些原因而采取的一些防止裂缝产生的措施，如设温度缝、设置后浇带、使用预应力混凝土、减小地基对水池的约束作用。     

混凝土常见裂缝的剖析与防治初探

剖析了混凝土裂缝的常见类型及成因，提出了防治混凝土常见裂缝的基本措施。     

鞍钢1780轧机超大箱型基础裂缝原因及控制对策：鞍钢1780热连轧技改工程？

导致大体积混凝土裂缝的原因有设计、材料、施工因素等。在分析裂缝产生原因基础上，通过正反两方面的经验教训，提出了控制混凝土裂缝的相应对策。     

混凝土裂缝成因与控制

判断和分析混凝土裂缝的成因是有效地控制和减少混凝土裂缝产生的最有效的途径。混凝土的裂缝是一个综合性的问题，主要是由结构构件的设计、材料的选用、混凝土的配合比、施工环境以及外界因素等多方面原因造成的。混凝土裂缝的控制应从这几个方面进行综合考虑。     

地下室防渗控制

地下室工程采用UEA混凝土技术，用膨胀加强带替代后浇缝，通过调整UEA掺量改善混凝土收缩变形，控制裂缝出现，降低混凝土浇筑温度，合理配筋，加强养护，确保地下室无渗漏。     

Utilizing Advanced Characterization Tools to Prevent Reflective Cracking

To prevent premature failures of rehabilitated concrete pavements, transportation authorities need tools to characterize the prerehab pavement condition of its load carrying capacity, and to determine the resistance of the overlay material to underlying crack/joint movements. Two quantitative methods, the rolling dynamic deflectometer (RDD) and overlay tester (OT), along with field performance data were employed in rehabilitation studies involving reflective cracks. The RDD is able to continuously assess vertical differential movements at joints/cracks that represent the potential for reflective cracks on existing pavements. The OT has the ability to determine the resistance of the overlay material to underlying crack/joint movements. The RDD W1?W3 deflections were used to determine areas that have a high potential for reflective cracking due to poor load transfer across joints and cracks. This paper documents results from the RDD and OT on the following five rehabilitation projects: (1) SH225; (2) US96; (3) SH12; (4) SH342; and (5) IH35W. Based on the available test results from these five projects, it was observed that the W1?W3 threshold values of 5.5 mils (0.140 mm) for exposed concrete pavement and 6.5 mils (0.165 mm) for composite pavement with existing hot mix asphalt overlay and an OT threshold value of 700 cycles correlated well with the field performance. Ignoring either of these critical factors may lead to premature reflective cracking.     

浅谈现浇混凝土楼板裂缝在施工过程中的控制

现浇混凝土楼板经常出现裂缝，造成裂缝原因很多，裂缝形成多种多样，本文介绍了裂缝的存在的形式，产生原因，以及在设计施工，原材料控制中采取减少或避免楼板产生裂缝的措施。     

Fracture Mechanics Based Model for Joints under Cyclic Loading

A generalized interface model for joints and cracks in quasi-brittle materials is formulated. The proposed model marries an existing fracture mechanics based one developed for monotonic loading of concrete with another frictional based model developed for the cyclic response of rock joints to address the (reverse) cyclic response of rough surfaces in the presence of cohesive stresses. The properties of the model and its capability to capture several experimentally observed behaviors are shown by the numerical simulations performed. This joint constitutive model is particularly suitable to simulate the seismic response of dam/rock joints subjected to seismic excitation, or of concrete joints under reverse cyclic loading.     

浅谈温度对混凝土裂缝的影响及预防措施

通过多年的现场观察并查阅有关混凝土内部应力方面的专著,对混凝土温度裂缝产生的原因、现场混凝土温度的控制和预防裂缝的措施等进行阐述。     

Use of an Infrared Joint Heater to Improve Longitudinal Joint Performance in Hot Mix Asphalt Pavements

Longitudinal joint cracking is one of the most prevalent forms of distress in asphalt concrete pavements. The joint area does not achieve the same density as the mat due to an unconfined edge on the initial pass and a cold joint during the second pass. The lower density allows water to penetrate and the material cracks, usually within one?year of construction. There are many techniques for constructing longitudinal joints, one being to preheat the joint prior to paving the second lane. This paper describes a field study conducted in New Hampshire using an infrared joint heater. Thermocouples were embedded in the pavement to determine the extent of heat penetration from the infrared heaters. Cores were taken along the joint and in the travel lanes for both the control and test sections. Density and strength measurements were taken on the cores. Permeability measurements along the control and test joints were performed. A cracking survey performed one?year after construction showed that the section of pavement where the infrared heater was used had significantly less cracking than the control section.     

如何预防水泥混凝土路面的裂缝和断板

介绍了水泥混凝土路面几种常见裂缝类型,并进行了简要的原因分析,提出了预防水泥混凝土路面裂缝(或断板)的措施。     

Modeling Cracking in Shell-Type Reinforced Concrete Structures

A three-dimensional (3D) hypoelastic material model for modeling material properties of cracked reinforced concrete is proposed. Material properties of multidirectionally cracked reinforced concrete are represented by the material properties of intact concrete and a number of uniaxially cracked concrete with their coupling solids. Cracking effects due to multiple nonorthogonal cracks are traced in each uniaxially cracked concrete. Tension softening and aggregate interlock occurring at the crack interface as well as tension stiffening and compression softening initiated in concrete between cracks due to multiple nonorthogonal cracks are all incorporated explicitly. RC panels under in-plane loading and RC slab under pure torsion have been analyzed. The developed 3D hypoelastic material model has been proved to be efficient and effective in modeling the material behaviors of cracked reinforced concrete in shell-type RC structures. The deformational response, the ultimate strength, and failure mode can be captured reasonably well.     

混凝土收缩裂缝的计算机理及防治措施

介绍混凝土收缩裂缝的计算机理,分析混凝土收缩裂缝的形成原因,提出裂缝防治措施,并通过工程实例介绍其处理方法。