【摘要】：作為常用的路面鋪裝類型,水泥路面在我國(guó)公路建設(shè)中得到了廣泛的應(yīng)用。而各種荷載等級(jí)交通的水泥路面常選用水泥穩(wěn)定碎石作為其基層材料使用。水泥面板在施工時(shí)混凝土中的水泥漿會(huì)滲入基層,在面板與基層層間形成過(guò)渡層,并將面板和基層粘結(jié)在一起,形成初始不可持續(xù)的粘結(jié)狀態(tài)。面板混凝土在多種因素綜合作用下,割縫底端將由于應(yīng)力集中而產(chǎn)生裂紋,裂紋不斷向下擴(kuò)展并最終貫穿面板。裂紋貫穿面板的瞬間產(chǎn)生的巨大回復(fù)力,會(huì)導(dǎo)致層間發(fā)生分離,進(jìn)而引起三種層間基本破壞形式的發(fā)生,這將導(dǎo)致路面承載能力大幅降低。鑒此,避免三種層間基本破壞的發(fā)生很有必要,而阻止過(guò)渡層的產(chǎn)生是避免破壞發(fā)生的關(guān)鍵。研究證實(shí),層間鋪筑隔離材料能有效阻止過(guò)渡層的產(chǎn)生。相對(duì)各類型的隔離材料,蠟制養(yǎng)護(hù)劑有著表面潤(rùn)滑性能好、施工快、成本低等獨(dú)特的優(yōu)點(diǎn),因此有必要對(duì)這種優(yōu)良隔離材料的隔離性能做進(jìn)一步的研究,以期在特定情況下充分發(fā)揮出其隔離特性。通過(guò)在不同構(gòu)造深度的水穩(wěn)碎石基層上分別噴灑不同劑量的蠟制養(yǎng)護(hù)劑,并在水穩(wěn)碎石基層上進(jìn)行擺式摩擦、層間剪切、滑動(dòng)摩擦力以及法向拉拔等各項(xiàng)隔離性能試驗(yàn),來(lái)測(cè)定各項(xiàng)隔離性能的指標(biāo)值,進(jìn)而分析噴灑蠟制養(yǎng)護(hù)劑后層間粘結(jié)的改善情況。試驗(yàn)結(jié)果表明,水泥穩(wěn)定碎石基層上噴灑蠟制養(yǎng)護(hù)劑,能有效降低層間的粘結(jié)。一定噴灑量范圍內(nèi),蠟制養(yǎng)護(hù)劑噴灑的越多,降低層間粘結(jié)效果就越明顯。此外,論文還分析了蠟制養(yǎng)護(hù)劑固化成膜的過(guò)程,分析結(jié)果得知蠟制養(yǎng)護(hù)劑向水穩(wěn)碎石基層下滲過(guò)程中,粘滯性會(huì)不斷的增大。這個(gè)過(guò)程中易發(fā)生孔隙內(nèi)壁成包的現(xiàn)象,并可能將空氣包裹起來(lái),使得更多的蠟制養(yǎng)護(hù)劑在基層表面成膜。結(jié)合此現(xiàn)象,本文提出了“延時(shí)分次”噴灑的方法去噴灑定量的蠟制養(yǎng)護(hù)劑,以提升隔離效果。
[Abstract]:As a common pavement type, cement pavement has been widely used in highway construction in China. Cement stabilized gravel is often used as base material for various load-grade traffic cement pavement. The cement slurry in concrete will infiltrate into the base course and form a transition layer between the face slab and the base layer during the construction, and bond the slab and the base to form the initial unsustainable bond state. Under the combined action of many factors, cracks will occur at the bottom of the slit joint due to stress concentration, and the cracks will continue to propagate downward and eventually run through the slab. The huge recovery force generated by the crack through the panel will lead to the separation of the layers and the occurrence of three basic failure forms between the layers which will lead to the reduction of the bearing capacity of the pavement. Therefore, it is necessary to avoid the basic damage between the three layers, and the key to avoid the damage is to prevent the transition layer from occurring. It has been proved that the interlayer paving and isolating material can effectively prevent the formation of the transition layer. Compared with various types of insulating materials, wax curing agents have the unique advantages of good surface lubrication, fast construction and low cost. Therefore, it is necessary to further study the isolation performance of this excellent insulating material. In order to give full play to its isolation characteristics under specific circumstances. By spraying different doses of wax curing agent on the hydraulic stabilized gravel base at different structural depths, and carrying out the experiments on the hydraulic stabilized gravel base, such as pendulum friction, interlayer shear, sliding friction force and normal drawing, etc., To determine the index value of each isolation performance, and then analyze the improvement of interlayer bond after spraying wax curing agent. The test results show that spraying wax curing agent on cement stabilized macadam base can effectively reduce interlayer bond. The more wax curing agent is sprayed, the lower the interlayer bonding effect is. In addition, the paper also analyzes the curing process of wax curing agent, and the results show that the viscosity of wax curing agent will increase continuously in the process of infiltration of wax curing agent to water stabilized crushed stone base. In this process, it is easy to wrap the inner wall of the pore, and possibly wrap the air, so that more wax curing agents are formed on the base surface. Combined with this phenomenon, this paper puts forward the method of "delay grading" spraying to spray quantitative wax curing agent in order to improve the isolation effect.
【學(xué)位授予單位】：長(zhǎng)沙理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U414

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