建筑行业引入水泥稳定碎石材料带动技术发展.doc

/建筑行业引入水泥稳定碎石材料带动技术发展/建筑行业引入水泥稳定碎石材料带动技术发展随着我国建筑行业的快速发展，建设用的碎石越来越多。水泥稳定碎石材料是我国应用范围最为广泛的建筑基层材料，而水稳碎石材料的级配组成是影响材料性能的最主要方面之一。With the rapid development of Chinas construction industry, more and more construction of gravel. Cement stabilized macadam base material is the most widely used building materials in our country, gradation and cement stabilized macadam material composition is one of the most important aspects of the influence of material properties.对于水泥稳定碎石等半刚性材料来说，级配不仅对材料强度有重要的影响，而且对材料的干缩与温缩以及抗冲刷性的影响都是巨大的，加强对水泥稳定碎石等半刚性材料级配的研究是改善半刚性材料路用性能的重要措施之一。 For the cement stabilized macadam, semi-rigid materials, gradation not only has an important influence on the strength of the material, and the material of dry shrinkage and temperature shrinkage and erosion resistance are enormous, strengthen the research of cement stabilized macadam semi-rigid materials such as gradation is one of the important measures to improve the use performance of semi-rigid materials.水泥稳定碎石根据粗集料和细集料在混合料中的分布状态可以划分为悬浮密实结构、骨架密实结构、骨架孔隙结构和均匀密实型结构。通过机械碾压作用水泥稳定碎石能紧密的嵌挤在一起，并依靠颗粒之间的嵌挤和摩阻作用而形成的内摩阻力使其具有一定的强度和稳定性。它们在粉煤灰中以球形玻璃体的形式存在，这种球形玻璃体比较稳定，表面又相当致密，不易水化，水泥粉煤灰早期反应主要是水泥遇水后产生水解与水化反应，水泥水化生成硅酸钙晶体，这些晶体产生部分强度，同时水泥水化生成氢氧化钙通过液相扩散到粉煤灰球形玻璃体表面，发生化学吸附和侵蚀，生成水化硅酸钙与水化铝酸钙，水化产物以凝胶体出现，随着凝期的增长，转化为纤维状晶体，晶体相互交叉，形成连锁结构，填充混合物的孔隙，形成较高的强度。再者，水泥水化生成的产物，在集料的空隙中相互交织搭接，将集料颗粒包裹连接起来，使其逐渐丧失了原有的塑性等性质，并且随着水化产物的增加，混合料也逐渐坚固起来，在这一过程中主要包括3种作用形式：离子交换作用、化学激发作用、碳酸化作用。由此，增大了水泥稳定碎石的强度。Cement stabilized macadam according to the distribution of coarse and fine aggregate in the mixture can be divided into suspended dense structure, framework dense structure, pore structure and uniform framework dense structure. The cement stabilized macadam effect of mechanical compaction can tightly block crowded together, the inner frictional resistance between the particles and rely on the interlocking and friction is formed by the action of which has a certain strength and stability. They fly ash to spherical vitreous form existence, the spherical vitreous body is relatively stable, and relatively dense surface, not easy hydration, cement and fly ash early reaction mainly cement water after the reaction of hydrolysis and hydration, the hydration of cement production calcium silicate crystals, the crystals produced some strength, at the same time, hydration calcium hydroxide cement by liquid phase diffusion to fly ash spherical vitreous surface, chemical adsorption and erosion, acid to produce calcium hydrated calcium silicate and water of hydration products of aluminum, with gel, with coagulation phase of growth, into a fibrous crystal, crystal cross each other, forming a chain structure, filling the mixture formation pore, high strength. Furthermore, the product of cement hydration generated, voids in aggregate intertwined overlap each other, the aggregate particles wrapped together, make it gradually lost the plastic properties of the original, and with the increase of hydration products, mixture also gradually strengthened, in this process mainly includes 3 kinds of effect: ion exchange, chemical stimulation, carbonation. Thus, by the strength of cement stabilized macadam.首先是材料方面，例如石料的粗细直接影响水泥稳定碎石基层的强度、平整度和裂缝的产生。水泥稳定碎石的粒料越粗，强度越高，稳定性越好，预防温缩、干缩裂缝的能力越强。同时，当细集料增加时，混合料的温缩系数随温度降低变化幅度越来越大。温度越低，细粒料对温缩的影响也越大。而且石粉含量偏多时，水泥稳定碎石的收缩性增大，裂缝也就增多。因此，施工现场对于集料的级配控制一定要把好关，严格控制粉料的含量。水泥稳定碎石基干缩应变随混合料的含水量增加而增大。因此在施工时，应根据天气情况当增加或减少拌和用水量。 First of all materials, such as stone thickness directly influences of cement stabilized macadam base strength, smoothness and cracks. Aggregate of cement stabilized gravel coarse, higher strength, better stability, prevention of temperature shrinkage, dry shrinkage crack more strong ability. At the same time, when the fine aggregate increases, the mixture temperature shrinkage coefficient increases with decreasing temperature changes more and more. The lower the temperature, fine aggregate on the effects of temperature and shrinkage is greater. And stone powder content partial much, shrinkage of cement stabilized macadam is increased, also increased the crack. Therefore, the construction site for the aggregate gradation control must take off, strictly controlling the content of powder. Cement stabilized macadam base shrinkage strain with the moisture content of mixture increases. Therefore in the construction, should increase or decrease the mixing water according to the weather condition.当然还应抓好施工控制工作。就压实度来说，水泥稳定碎石混合料压实度的控制是保证强度达到标准要求的重要手段之一。城市道路各种地下工程管线设施的检查维修井和未能及时迁移的地上杆线给基层的碾压带来了难题。这些结构设施的周围往往是大型机械碾压的死角。尽管面层将采取钢筋加固补强措施，但基层的压实度保证仍不能松懈。为保证压实度达到标准，检查井周围混合料的摊铺厚度可比正常路段薄一些，水泥的含量增加1%左右，使用小型机具夯实多遍。再配合路面的井圈加固，以保证井圈周围的路面的工作寿命。 On the degree of compaction, control of cement stabilized macadam compaction is the guarantee of strength to achieve one of the important means of standards. Difficult inspection wells and failed to repair city roads of various underground engineering pipeline facilities promptly transfer the ground rod line to the grass-roots rolling. Often around these structures are large mechanical compaction of the dead. Although the surface layer will take the steel reinforcement measures, but the grass-roots compaction that still can not relax. In order to ensure the compaction standard, inspection wells around the mixture paving thickness can be thinner than the normal section, the increase of the cement content is about 1%, the use of small tools and many times. Combined with pavement well ring reinforcement, to ensure that the working life of the well ring road around the.综上所述，建设用碎石的稳定首先应加强对水泥稳定碎石等半刚性材料级配的工作。与此同时研究并搞清楚影响碎石稳定的各种因素，以便水稳碎石在基层的使用中出现裂缝等比较难处理的问题。In summary, construction