早强复掺修补材料在水泥混凝土道面中的研究及应用
发布时间：2018-09-06 09:28
【摘要】：随着交通量的不断增长、重载车辆的增多，加之水泥混凝土材料自身刚度大、易收缩开裂等特征以及复杂的环境耦合作用，导致我国水泥混凝土路面建成通车后在使用过程中出现的病害问题逐渐突出，特别是混凝土板的破碎问题。基于此，针对养护工程具体情况及施工要求，作者对现有材料进行优选，旨在研究一种满足2h左右的罐车运输条件，浇筑1d后可开放交通，且使用性能良好的早强复掺修补混凝土，以解决当前水泥混凝土板维修周期长和耐久性差等问题。 首先，对优选的原材料进行了性能测试，并根据交通状况、路面结构类型、路面状况、施工时间等提出了混凝土板材料的工作性、力学性和耐久性的技术指标要求。然后，研究了配合比设计参数和外掺料对复掺混凝土性能的影响规律，据此提出了一套配合比设计方法。 其次，基于上述配比，研究了复掺混凝土的耐久性能。通过研究，得出结论：复掺混凝土的耐磨性能、抗冲击能力、抗硫酸侵蚀等性能明显优于相同配比下的普通道路混凝土。 为揭示复掺混凝土的良好性能的内在原因，借助XRD、SEM两种测试手段对复掺水泥浆和砂浆的微观结构进行了研究，分析了复掺水泥水化机理，并进一步提出了理想的复掺混凝土微结构模型，分析了微观结构与宏观力学性能的联系。 最后将研究的复掺混凝土用于依托高速公路的试验段修复，，得到了很好的应用。
[Abstract]:With the continuous growth of traffic volume, the increase of heavy-duty vehicles, the characteristics of cement concrete materials such as high stiffness, easy shrinkage and cracking, and complex environmental coupling, the problems of cement concrete pavement in service process are gradually prominent, especially the breakage of concrete slabs. In view of the concrete conditions and construction requirements of the maintenance project, the author optimizes the existing materials in order to study a kind of tank truck transportation condition which can satisfy about 2 hours, open the traffic after pouring for 1 day, and use early-strength composite repair concrete with good performance to solve the problems of long maintenance period and poor durability of the current cement concrete slab.
Firstly, the performances of the preferred raw materials are tested, and the requirements of workability, mechanics and durability of concrete slab materials are put forward according to traffic conditions, pavement structure types, pavement conditions and construction time. A set of mix design method is put forward.
Secondly, based on the above-mentioned mixing ratio, the durability of the mixed concrete is studied. Through the study, it is concluded that the wear resistance, impact resistance and sulfuric acid corrosion resistance of the mixed concrete are obviously superior to the ordinary road concrete under the same mixing ratio.
In order to reveal the intrinsic reason of the good performance of the mixed concrete, the microstructure of the mixed cement mortar and mortar was studied by means of XRD and SEM, the hydration mechanism of the mixed cement was analyzed, and the ideal microstructure model of the mixed concrete was put forward, and the relationship between the microstructure and the macroscopic mechanical properties was analyzed.
Finally, the composite concrete is used to repair the test section relying on the expressway, and it has been applied very well.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414;U416.216
本文编号：2225921
[Abstract]:With the continuous growth of traffic volume, the increase of heavy-duty vehicles, the characteristics of cement concrete materials such as high stiffness, easy shrinkage and cracking, and complex environmental coupling, the problems of cement concrete pavement in service process are gradually prominent, especially the breakage of concrete slabs. In view of the concrete conditions and construction requirements of the maintenance project, the author optimizes the existing materials in order to study a kind of tank truck transportation condition which can satisfy about 2 hours, open the traffic after pouring for 1 day, and use early-strength composite repair concrete with good performance to solve the problems of long maintenance period and poor durability of the current cement concrete slab.
Firstly, the performances of the preferred raw materials are tested, and the requirements of workability, mechanics and durability of concrete slab materials are put forward according to traffic conditions, pavement structure types, pavement conditions and construction time. A set of mix design method is put forward.
Secondly, based on the above-mentioned mixing ratio, the durability of the mixed concrete is studied. Through the study, it is concluded that the wear resistance, impact resistance and sulfuric acid corrosion resistance of the mixed concrete are obviously superior to the ordinary road concrete under the same mixing ratio.
In order to reveal the intrinsic reason of the good performance of the mixed concrete, the microstructure of the mixed cement mortar and mortar was studied by means of XRD and SEM, the hydration mechanism of the mixed cement was analyzed, and the ideal microstructure model of the mixed concrete was put forward, and the relationship between the microstructure and the macroscopic mechanical properties was analyzed.
Finally, the composite concrete is used to repair the test section relying on the expressway, and it has been applied very well.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414;U416.216
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本文编号：2225921
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