三相复合导电混凝土用于道路及桥面融雪化冰的研究
发布时间：2018-09-11 18:21
【摘要】：冰雪路面对于道路交通安全带来巨大的影响，目前常用于道路及桥面融雪化冰的方式主要是人工机械清除和撒布融雪剂，，但其对构造物的腐蚀及对环境的污染等作用十分明显。机械除冰雪通常配合融雪剂使用，冰层和路面之间的粘结力导致结冰难以彻底清除，机械设备也会对路面造成一定的破坏。 为了解决冬季路面融雪问题，本文研究了复合导电混凝土用于道路及桥面融雪化冰技术。复合导电混凝土材料是指采用两种以上的导电颗粒（如石墨、炭黑）、导电纤维（如钢纤维、碳纤维）和导电骨料（如钢渣、钢削），添加到水泥混凝土中形成具有低电阻率导电混凝土。 在对掺加钢纤维、碳纤维以及钢纤维-石墨等导电材料的导电混凝土的导电性能试验研究的基础上，提出了钢纤维-石墨-碳纤维三相复合导电混凝土。通过对其导电性能和抗压强度的试验分析，以满足电阻率和抗压强度为目标，确定了三相复合导电混凝土的配合比及制备工艺。 三相复合导电混凝土有效地降低了碳纤维的掺量，避免了大掺量碳纤维在混凝土中结团导致的浪费，尤其降低了导电混凝土的造价。同时，石墨和钢纤维的使用，既降低了导电混凝土的电阻率，又保证了混凝土的力学强度。耐磨性和抗冻性的研究表明了三相复合导电混凝土的路用性能可靠。采用不同功率密度下的室内升温试验测试了三相复合导电混凝土的升温效果，最终确定的三相复合导电混凝土中导电材料钢纤维、碳纤维和石墨的掺量分别0.8%、0.4%和3%。通过ANSYS有限元分析模型的建立，拟合室内升温试验，模拟了不同环境下的融雪化冰效果，尤其是在-15℃的环境温度，风速在7级及以下，2cm厚新雪覆盖路面时，8cm厚的混凝土板输入1008W/m2的功率密度，板表面温度升高到1.0℃所需时间在2h以内。 通过修筑试验路，研究了三相复合导电混凝土路面的施工工艺及电极布设方法，对其用于路面除冰雪的经济性进行了分析，表明其具有良好的应用前景。
[Abstract]:Ice and snow pavement has a great impact on road traffic safety. At present, the main methods used in road and bridge surface to melt snow and ice are artificial mechanical cleaning and dispersing snow melting agent, but its effect on structure corrosion and environmental pollution is very obvious. Mechanical snow and ice removal is usually used in combination with snow melting agent. The adhesion between ice layer and road surface leads to the freezing is difficult to be completely cleared. Machinery and equipment will also cause certain damage to the road surface. In order to solve the snow melting problem of road surface in winter, this paper studies the ice melting technology of road and bridge deck with composite conductive concrete. Composite conductive concrete materials refer to the use of more than two kinds of conductive particles (such as graphite, carbon black), conductive fibers (such as steel fibers, carbon fibers) and conductive aggregates (such as steel slag), Steel), added to cement concrete to form conductive concrete with low resistivity. Based on the experimental study of conductive concrete with steel fiber carbon fiber steel fiber graphite and other conductive materials a three-phase composite conductive concrete with steel fiber graphite carbon fiber was proposed. Through the test and analysis of its electrical conductivity and compressive strength, the mixture ratio and preparation process of three-phase composite conductive concrete were determined in order to meet the targets of resistivity and compressive strength. The three-phase composite conductive concrete can effectively reduce the amount of carbon fiber, avoid the waste caused by the agglomeration of large amount of carbon fiber in concrete, especially reduce the cost of conductive concrete. At the same time, the use of graphite and steel fiber not only reduces the resistivity of conductive concrete, but also ensures the mechanical strength of concrete. The study of wear resistance and frost resistance shows that the road performance of three-phase composite conductive concrete is reliable. The heating effect of three-phase composite conductive concrete was tested by indoor heating test under different power density. Finally, the content of steel fiber, carbon fiber and graphite in three-phase composite conductive concrete was determined to be 0.8% and 3% respectively. Through the establishment of ANSYS finite element analysis model and the fitting of indoor heating test, the effect of snowmelt and ice melting in different environments was simulated, especially at -15 鈩
本文编号：2237493
[Abstract]:Ice and snow pavement has a great impact on road traffic safety. At present, the main methods used in road and bridge surface to melt snow and ice are artificial mechanical cleaning and dispersing snow melting agent, but its effect on structure corrosion and environmental pollution is very obvious. Mechanical snow and ice removal is usually used in combination with snow melting agent. The adhesion between ice layer and road surface leads to the freezing is difficult to be completely cleared. Machinery and equipment will also cause certain damage to the road surface. In order to solve the snow melting problem of road surface in winter, this paper studies the ice melting technology of road and bridge deck with composite conductive concrete. Composite conductive concrete materials refer to the use of more than two kinds of conductive particles (such as graphite, carbon black), conductive fibers (such as steel fibers, carbon fibers) and conductive aggregates (such as steel slag), Steel), added to cement concrete to form conductive concrete with low resistivity. Based on the experimental study of conductive concrete with steel fiber carbon fiber steel fiber graphite and other conductive materials a three-phase composite conductive concrete with steel fiber graphite carbon fiber was proposed. Through the test and analysis of its electrical conductivity and compressive strength, the mixture ratio and preparation process of three-phase composite conductive concrete were determined in order to meet the targets of resistivity and compressive strength. The three-phase composite conductive concrete can effectively reduce the amount of carbon fiber, avoid the waste caused by the agglomeration of large amount of carbon fiber in concrete, especially reduce the cost of conductive concrete. At the same time, the use of graphite and steel fiber not only reduces the resistivity of conductive concrete, but also ensures the mechanical strength of concrete. The study of wear resistance and frost resistance shows that the road performance of three-phase composite conductive concrete is reliable. The heating effect of three-phase composite conductive concrete was tested by indoor heating test under different power density. Finally, the content of steel fiber, carbon fiber and graphite in three-phase composite conductive concrete was determined to be 0.8% and 3% respectively. Through the establishment of ANSYS finite element analysis model and the fitting of indoor heating test, the effect of snowmelt and ice melting in different environments was simulated, especially at -15 鈩
本文编号：2237493
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