早強復摻修補材料在水泥混凝土道面中的研究及應用
發(fā)布時間：2018-09-06 09:28
【摘要】：隨著交通量的不斷增長、重載車輛的增多，加之水泥混凝土材料自身剛度大、易收縮開裂等特征以及復雜的環(huán)境耦合作用，導致我國水泥混凝土路面建成通車后在使用過程中出現(xiàn)的病害問題逐漸突出，特別是混凝土板的破碎問題。基于此，針對養(yǎng)護工程具體情況及施工要求，作者對現(xiàn)有材料進行優(yōu)選，旨在研究一種滿足2h左右的罐車運輸條件，澆筑1d后可開放交通，且使用性能良好的早強復摻修補混凝土，以解決當前水泥混凝土板維修周期長和耐久性差等問題。 首先，對優(yōu)選的原材料進行了性能測試，并根據(jù)交通狀況、路面結構類型、路面狀況、施工時間等提出了混凝土板材料的工作性、力學性和耐久性的技術指標要求。然后，研究了配合比設計參數(shù)和外摻料對復摻混凝土性能的影響規(guī)律，據(jù)此提出了一套配合比設計方法。 其次，基于上述配比，研究了復摻混凝土的耐久性能。通過研究，得出結論：復摻混凝土的耐磨性能、抗沖擊能力、抗硫酸侵蝕等性能明顯優(yōu)于相同配比下的普通道路混凝土。 為揭示復摻混凝土的良好性能的內(nèi)在原因，借助XRD、SEM兩種測試手段對復摻水泥漿和砂漿的微觀結構進行了研究，分析了復摻水泥水化機理，并進一步提出了理想的復摻混凝土微結構模型，分析了微觀結構與宏觀力學性能的聯(lián)系。 最后將研究的復摻混凝土用于依托高速公路的試驗段修復，，得到了很好的應用。
[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.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U414;U416.216
本文編號：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.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U414;U416.216
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本文編號：2225921
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