本文關(guān)鍵詞： 干硬性混凝土 路緣石 配合比設計 耐久性 抗氯離子滲透　出處：《吉林大學》2015年碩士論文　論文類型：學位論文

【摘要】：近年來我國交通基礎設施發(fā)展迅猛,各級公路建設如火如荼。路緣石作為道路結(jié)構(gòu)中的重要組成部分,需求量也在不斷增大。路緣石的設置不僅起到導向、連接和便于排水的作用,而且對于路面施工及路肩的穩(wěn)定有一定幫助,因而其耐久性關(guān)系著公路的暢通和運行安全。目前常用的路緣石有巖石類路緣石和混凝土類路緣石,巖石類路緣石力學性能好、耐腐蝕,但造價高,很難在公路上大規(guī)模應用。而混凝土預制塊路緣石抵御自然氣候條件連續(xù)凍融破壞和除雪劑所造成的腐蝕破壞能力較差,導致使用壽命短,養(yǎng)護維修成本較高。干硬性混凝土具有水灰比低、早期強度高及成型速度快等特點,因而在壓實成型后可立即拆模提升模板周轉(zhuǎn)速率與生產(chǎn)效率。干硬性混凝土的高效率與經(jīng)濟性使其在土木工程中得到了廣泛應用,但是其在路緣石的應用研究上還未成熟。為了進一步推廣干硬性混凝土路緣石的應用,提升其耐久性,本文對干硬性混凝土路緣石進行了系統(tǒng)的試驗研究,具體研究內(nèi)容及成果如下:本文首先從干硬性混凝土的配合比設計入手,通過對混凝土級配設計理論以及配合比設計方法的比選,根據(jù)最大密度曲線理論進行級配的計算及評價分析。因為干硬性混凝土水灰比較低,成型方式與普通混凝土有所區(qū)別,因此其配合比設計不能簡單的采用普通混凝土相關(guān)設計方法。本文參照《現(xiàn)代混凝土配合比設計手冊》中相關(guān)方法,并結(jié)合試驗驗證,最后得到力學性能較優(yōu)的路緣石生產(chǎn)配合比。干硬性混凝土采用振動壓實成型,從而保證其能夠成型后立即脫模,并通過蒸汽養(yǎng)生,保證其早期強度的快速形成。因而干硬性混凝土路緣石的制備工藝及養(yǎng)生工藝對其成品質(zhì)量的好壞有著重要影響。本文結(jié)合吉林久盛生態(tài)環(huán)境科技股份有限公司自主設計制造的混凝土砌塊成型機生產(chǎn)干硬性混凝土路緣石,通過對其生產(chǎn)過程及養(yǎng)護過程中主要影響參數(shù)進行分析,充分發(fā)揮該成型機特點,使得各參數(shù)組合后得到最大的生產(chǎn)效率與生產(chǎn)質(zhì)量。對初選得到的兩組干硬性混凝土路緣石配合比試件耐久性能進行試驗研究,分析其抗凍融性能與抗氯離子滲透性能,對其耐久性進行評價,并比選出最終干硬性混凝土生產(chǎn)配合比。試驗結(jié)果表明兩組配合比試件性能均能滿足使用要求,其中水灰比為0.37時配合比制備試件性能更好。最后結(jié)合安龍泉互通立交橋建設工程,鋪設干硬性混凝土路緣石試驗段對其使用性能進行了驗證。通過跟蹤調(diào)查發(fā)現(xiàn),干硬性混凝土路緣石應用效果良好,其抗凍融破壞耐久性比普通混凝土要好,具有長期穩(wěn)定性,適用于東北等季節(jié)性凍土區(qū)。
[Abstract]:In recent years, the traffic infrastructure in China has developed rapidly, and highway construction at all levels is in full swing. As an important part of the road structure, the demand for the road-edge stone is also increasing. The installation of the road-edge stone not only plays a guiding role, The connection and convenience of drainage are helpful to the road construction and the stability of the road shoulder, so its durability is related to the smooth and safe operation of the highway. At present, the commonly used kerbstones are rock kerbstones and concrete kerbstones. Rock kerbstones have good mechanical properties and corrosion resistance, but they are difficult to be used in large scale on highway because of their high cost. However, concrete precast kerbstones have poor ability to resist continuous freezing and thawing damage in natural climate and corrosion damage caused by snow removal agents. As a result, the service life is short, the maintenance cost is high, the dry hard concrete has the characteristics of low water-cement ratio, high early strength and fast forming speed, etc. Therefore, the mould can be removed immediately after compaction to raise the turnover rate and production efficiency of the formwork. The high efficiency and economy of dry hard concrete make it widely used in civil engineering. In order to further popularize the application of dry-hard concrete kerbstone and improve its durability, a systematic experimental study on dry-hard concrete kerbstone is carried out in this paper. The specific research contents and results are as follows: firstly, this paper starts with the mix ratio design of dry-hard concrete, compares and selects the concrete gradation design theory and the mix proportion design method. According to the theory of maximum density curve, the gradation calculation and evaluation analysis are carried out. Because dry hard concrete is relatively low in water ash, the forming method is different from that of ordinary concrete. Therefore, the mix ratio design can not simply adopt the common concrete related design method. This paper refers to the correlation method in the Design Manual of Modern concrete mix ratio, and combines with the test to verify, Finally, the compaction ratio of road edge stone with better mechanical properties is obtained. The dry hard concrete is formed by vibration compaction, so as to ensure that it can be moulded immediately after forming, and can be preserved by steam. Therefore, the preparation technology and health preservation technology of dry hard concrete roadway edge stone have an important influence on the quality of its finished products. This paper combines with Jilin Jiusheng Ecological Environment Science and Technology Co., Ltd. The self-designed and manufactured concrete block forming machine produces dry hard concrete road edge stone, Through the analysis of the main influence parameters in the process of production and maintenance, the characteristics of the molding machine are brought into full play. The maximum production efficiency and production quality are obtained by the combination of various parameters. The durability of two groups of dry and hard concrete compounding specimens obtained from the primary selection is studied, and the freeze-thaw resistance and chloride ion permeation resistance are analyzed. The durability of the concrete is evaluated, and the final mix ratio of dry and hard concrete is selected. The test results show that the performance of the two groups of matched specimens can meet the requirements of application. When the water-cement ratio is 0.37, the performance of the sample is better. Finally, the performance of the test piece is verified by laying dry hard concrete roadway edge stone in the construction project of Anlongquan Interchange Bridge. The pavement edge stone of dry-hard concrete has good application effect, its durability of freeze-thaw damage is better than that of ordinary concrete, it has long-term stability and is suitable for seasonal frozen soil areas such as Northeast China.
【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U414

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