【摘要】：冰雪路面對(duì)于道路交通安全帶來巨大的影響，目前常用于道路及橋面融雪化冰的方式主要是人工機(jī)械清除和撒布融雪劑，，但其對(duì)構(gòu)造物的腐蝕及對(duì)環(huán)境的污染等作用十分明顯。機(jī)械除冰雪通常配合融雪劑使用，冰層和路面之間的粘結(jié)力導(dǎo)致結(jié)冰難以徹底清除，機(jī)械設(shè)備也會(huì)對(duì)路面造成一定的破壞。 為了解決冬季路面融雪問題，本文研究了復(fù)合導(dǎo)電混凝土用于道路及橋面融雪化冰技術(shù)。復(fù)合導(dǎo)電混凝土材料是指采用兩種以上的導(dǎo)電顆粒（如石墨、炭黑）、導(dǎo)電纖維（如鋼纖維、碳纖維）和導(dǎo)電骨料（如鋼渣、鋼削），添加到水泥混凝土中形成具有低電阻率導(dǎo)電混凝土。 在對(duì)摻加鋼纖維、碳纖維以及鋼纖維-石墨等導(dǎo)電材料的導(dǎo)電混凝土的導(dǎo)電性能試驗(yàn)研究的基礎(chǔ)上，提出了鋼纖維-石墨-碳纖維三相復(fù)合導(dǎo)電混凝土。通過對(duì)其導(dǎo)電性能和抗壓強(qiáng)度的試驗(yàn)分析，以滿足電阻率和抗壓強(qiáng)度為目標(biāo)，確定了三相復(fù)合導(dǎo)電混凝土的配合比及制備工藝。 三相復(fù)合導(dǎo)電混凝土有效地降低了碳纖維的摻量，避免了大摻量碳纖維在混凝土中結(jié)團(tuán)導(dǎo)致的浪費(fèi)，尤其降低了導(dǎo)電混凝土的造價(jià)。同時(shí)，石墨和鋼纖維的使用，既降低了導(dǎo)電混凝土的電阻率，又保證了混凝土的力學(xué)強(qiáng)度。耐磨性和抗凍性的研究表明了三相復(fù)合導(dǎo)電混凝土的路用性能可靠。采用不同功率密度下的室內(nèi)升溫試驗(yàn)測試了三相復(fù)合導(dǎo)電混凝土的升溫效果，最終確定的三相復(fù)合導(dǎo)電混凝土中導(dǎo)電材料鋼纖維、碳纖維和石墨的摻量分別0.8%、0.4%和3%。通過ANSYS有限元分析模型的建立，擬合室內(nèi)升溫試驗(yàn)，模擬了不同環(huán)境下的融雪化冰效果，尤其是在-15℃的環(huán)境溫度，風(fēng)速在7級(jí)及以下，2cm厚新雪覆蓋路面時(shí)，8cm厚的混凝土板輸入1008W/m2的功率密度，板表面溫度升高到1.0℃所需時(shí)間在2h以內(nèi)。 通過修筑試驗(yàn)路，研究了三相復(fù)合導(dǎo)電混凝土路面的施工工藝及電極布設(shè)方法，對(duì)其用于路面除冰雪的經(jīng)濟(jì)性進(jìn)行了分析，表明其具有良好的應(yīng)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

本文編號(hào)：2237493