本文選題：低水泥劑量穩(wěn)定級配碎石基層　切入點(diǎn)：路用性能　出處：《沈陽建筑大學(xué)》2014年碩士論文

【摘要】：改革開放至今,瀝青路面在公路建設(shè)中得到前所未有的高速發(fā)展,使公路基礎(chǔ)設(shè)施總體水平實(shí)現(xiàn)了歷史性的跨越。半剛性基層廣泛應(yīng)用于我國道路結(jié)構(gòu)中,這主要是由于半剛性基層路面具有較強(qiáng)的承載能力、良好的穩(wěn)定性和耐久性等優(yōu)點(diǎn)。半剛性基層雖然有著以上突出的優(yōu)點(diǎn),但其自身也存在一定缺陷,主要表現(xiàn)在：半剛性基層自身容易產(chǎn)生干、溫縮裂縫,進(jìn)而在行車荷載的作用下反射到面層,形成反射裂縫；同時半剛性基層也不易于修補(bǔ),進(jìn)而影響了瀝青面層的使用壽命,以及水損害等問題。另外,半剛性基層損壞后修補(bǔ)困難。近年來,人們發(fā)現(xiàn)在瀝青面層和半剛性基層之間設(shè)置級配碎石柔性基層可以有效減少反射裂縫。但它的缺點(diǎn)主要表現(xiàn)為：回彈模量小,應(yīng)力擴(kuò)散能力差和塑性變形大。因此對于級配碎石的應(yīng)用,具有一定的局限性。綜合半剛性基層和級配碎石基層各自的特點(diǎn),本論文提出了半柔性基層的概念,所謂半柔性基層,是介于半剛性材料與柔性材料之間的一種結(jié)構(gòu)形式。低水泥劑量穩(wěn)定級配碎石通過降低混合料中的水泥劑量,柔化半剛性基層,從而達(dá)到防止反射裂縫的目的。本文針對低水泥劑量穩(wěn)定級配碎石基層材料進(jìn)行了室內(nèi)配合比設(shè)計和7d無側(cè)限抗壓強(qiáng)度試驗(yàn),同時本論文依托撫順沈環(huán)線大修工程,鋪筑一段2.5km試驗(yàn)路段,對沈環(huán)北線試驗(yàn)路段進(jìn)行現(xiàn)場檢測,內(nèi)容主要包括：低水泥劑量穩(wěn)定級配碎石基層壓實(shí)度檢測、回彈模量檢測。同時借鑒現(xiàn)行規(guī)范和已有成熟的研究成果,對低水泥劑量穩(wěn)定級配碎石基層的施工工藝進(jìn)行研究,主要有：混合料的拌合、混合料的裝料與運(yùn)輸、混合料的攤鋪及碾壓和養(yǎng)生四個方面。同時對施工質(zhì)量控制指標(biāo)和控制標(biāo)準(zhǔn)進(jìn)行研究,全面研究低水泥劑量穩(wěn)定級配碎石基層的施工工藝及控制指標(biāo),對于保證低水泥劑量穩(wěn)定級配碎石基層的施工質(zhì)量及推廣應(yīng)用具有重要意義。最后對試驗(yàn)路路用性能進(jìn)行了長期觀測,進(jìn)而驗(yàn)證低水泥劑量穩(wěn)定級配碎石基層抑制反射裂縫的效果。
[Abstract]:Since the reform and opening up to date, asphalt pavement has achieved unprecedented rapid development in highway construction, which has made the overall level of highway infrastructure achieve a historic leap.Semi-rigid base is widely used in road structure of our country, which is mainly due to its strong bearing capacity, good stability and durability.Although the semi-rigid base has the outstanding advantages above, it also has some defects, mainly in the following aspects: the semi-rigid base itself is easy to produce dry and warm shrinkage cracks, and then reflect to the surface layer under the action of driving load to form reflective cracks;At the same time, semi-rigid base is not easy to repair, which affects the service life of asphalt surface and water damage.In addition, the semi-rigid base after damage repair difficulties.In recent years, it has been found that setting graded macadam flexible base between asphalt surface and semi-rigid base can effectively reduce reflective cracks.However, its main shortcomings are small elastic modulus, poor stress diffusion ability and large plastic deformation.Therefore, the application of graded crushed stone has some limitations.Based on the characteristics of semi-rigid base and graded crushed stone base, the concept of semi-flexible base is put forward in this paper. The so-called semi-flexible base is a structural form between semi-rigid material and flexible material.By reducing the dosage of cement in the mixture, the stabilized graded macadam softens the semi-rigid base so as to prevent the reflection crack.In this paper, the indoor mix ratio design and unconfined compressive strength test of low cement dosage stabilized graded macadam base material were carried out. At the same time, a section of 2.5km test section was built based on the heavy repair project of Fushun Shenyang Ring Road.The field test of Shenhuan North Route is carried out, which mainly includes: low cement dose stabilized grained crushed stone base compaction test, resilient modulus detection.At the same time, referring to the current code and the mature research results, the construction technology of low cement dosage stabilized graded crushed stone base is studied. The main contents are: mixing of mixture, loading and transportation of mixture,The spread of the mixture and the compaction and health of the four aspects.At the same time, the construction quality control index and control standard are studied, and the construction technology and control index of low cement dosage stabilized graded crushed stone base are studied in an all-round way.It is of great significance to ensure the construction quality of low cement dosage stabilized graded crushed stone base and its popularization and application.Finally, the performance of the test road was observed for a long time, and the effect of reducing the reflection crack of the stabilized graded macadam base with low cement dosage was verified.
【學(xué)位授予單位】：沈陽建筑大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U414

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