本文關鍵詞：公路路面低成本水泥穩(wěn)定基層材料優(yōu)化及性能研究　出處：《長沙理工大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 路面 水泥穩(wěn)定基層 設計 性能 粉煤灰

【摘要】：公路路面基層作為路面結構的主要承重層,其性能的優(yōu)劣對整個路面結構的穩(wěn)定性起著決定性的作用。目前國內外許多研究將大劑量水泥應用到路面基層的穩(wěn)定改良中,從而改善了基層力學性能,獲得了較好的路用效果,但是也出現(xiàn)了許多問題。為響應我國“兩型社會”建設,在確保公路路面性能的基礎上,借鑒國內外先進的研究方法,針對低劑量水泥及固體工業(yè)廢渣用于公路基層穩(wěn)定材料進行研究,旨在一定程度上改善路面基層材料相關性能,降低工程成本及環(huán)境污染,并根據(jù)實際工程應用對其使用效果及經(jīng)濟效益進行評價,獲得主要結論如下:(1)不同配合比的擊實試驗結果表明,基于相同穩(wěn)定方法,隨著水泥含量的增加,水泥粉煤灰穩(wěn)定土的最佳含水量與最大干密度均隨之增加;5%水泥摻量的纖維穩(wěn)定土的最佳含水量為17.3%,干密度為1.749g/cm3;水泥粉煤灰穩(wěn)定碎石的最佳含水量隨著粉煤灰摻量的增加而增加,最大干密度呈先增后降趨勢。(2)水泥粉煤灰穩(wěn)定類材料試驗表明,在相同的養(yǎng)護齡期條件下,水泥含量與粉煤灰摻量對無側限抗壓強度均有一定的改善;且水泥粉煤灰穩(wěn)定碎石的抗壓強度隨著脫硫石膏與粉煤灰復合比例的升高而增加,與1:1復合比例相比,1:2、1:3復合比例的7d抗壓強度分別增加5%、10%。劈裂強度試驗結果顯示,粉煤灰的摻入對其改善效果明顯,可增加混合料的劈裂強度。根據(jù)破壞形式分析發(fā)現(xiàn),粉煤灰能很好地參與并促進摻加材料之間的火山灰反應,提高整體結構的密實度。(3)纖維水泥穩(wěn)定土的試驗表明,纖維摻量與長度對穩(wěn)定土的強度有一定的改善,纖維摻量與長度在一定的范圍內,可增加基體的抗壓及劈裂強度。與纖維摻量為0‰、2‰、4‰相比較,6‰摻量的纖維水泥穩(wěn)定土具有顯著的7d抗壓強度優(yōu)勢;結合其破壞形式分析發(fā)現(xiàn),聚丙烯纖維可顯著提高穩(wěn)定土基體的性能。(4)齡期對水泥穩(wěn)定類材料抗壓強度的影響分析發(fā)現(xiàn),養(yǎng)生早期基層材料的強度增長較快,而后期強度增長速率較慢。綜合比較分析不同配合比改良基層材料的路用效果及工程經(jīng)濟,粉煤灰及脫硫石膏的摻加,不僅使得混合料的強度等性能滿足實際工程需要,而且具有良好的經(jīng)濟效益和環(huán)保效應。
[Abstract]:Highway pavement base is the main bearing layer of pavement structure. The quality of its performance plays a decisive role in the stability of the whole pavement structure. At present, many researches at home and abroad have applied large amount of cement to the stability improvement of the pavement base, thus improving the mechanical properties of the base. In order to respond to the construction of "two-type society" in our country, on the basis of ensuring the performance of highway pavement, the advanced research methods at home and abroad are used for reference. In order to improve the performance of pavement base material and reduce the engineering cost and environmental pollution, the low dose cement and solid industrial waste residue used in road base stabilization material were studied in order to improve the performance of road base material to a certain extent. According to the practical engineering application, the application effect and economic benefit are evaluated, and the main conclusions are as follows: 1) the results of compaction test with different mix ratios show that the method is based on the same stability method. With the increase of cement content, the optimum moisture content and maximum dry density of cement fly ash stabilized soil increased. The optimum water content and dry density of fiber stabilized soil with 5% cement content are 17.3g / cm ~ (-3) and 1.749 g / cm ~ (-3) respectively. The optimum moisture content of cement fly ash stabilized macadam increased with the increase of fly ash content, and the maximum dry density increased first and then decreased. Under the same curing age, the content of cement and the content of fly ash can improve the unconfined compressive strength. The compressive strength of cement fly ash stabilized macadam increased with the increase of the ratio of desulphurized gypsum and fly ash, and compared with the ratio of 1: 1 / 1, the compressive strength of cement fly ash stabilized macadam increased by 1: 2. The compressive strength of 1: 3 composite ratio for 7 days increased by 5% and 10% respectively. The results of splitting strength test showed that the addition of fly ash had obvious effect on its improvement. According to the analysis of the failure form, the fly ash can participate in and promote the pozzolanic reaction between the materials. The experiment of improving the compactness of the whole structure shows that the fiber content and length have certain improvement on the strength of the stabilized soil, and the fiber content and length are in a certain range. The compressive strength and splitting strength of the matrix can be increased. Compared with the fiber content of 0 鈥，

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