水泥—石灰—干渣半剛性基層材料路用性能試驗(yàn)研究
發(fā)布時(shí)間：2018-08-20 08:24
【摘要】：干渣是電廠或煉鐵廠通過干排渣工藝得到的一種固體廢棄物。干渣通過磁選破碎加工后的利用率較低,所以大多以固體廢物的形式排放、堆積,不僅占用土地,而且污染環(huán)境。干渣經(jīng)破碎、磁選、篩分等工藝獲得的干渣顆粒具備軋制碎石的性能。但干渣遇水易膨脹的特性等多方面因素使其在道路工程領(lǐng)域的應(yīng)用受到限制。為繼續(xù)探索干渣在道路工程中的應(yīng)用途徑,筆者將4.75mm的干渣集料取代部分碎石用于骨架密實(shí)型半剛性基層進(jìn)行研究,利用干渣表面粗糙及內(nèi)摩擦角較大的特性,提高骨架的穩(wěn)定性能。選用水泥、石灰、干渣粉、干渣集料進(jìn)行配比設(shè)計(jì)和性能測試,旨在探索一種新型水泥-石灰-干渣半剛性基層材料。通過無側(cè)限抗壓強(qiáng)度試驗(yàn)、劈裂強(qiáng)度試驗(yàn)、抗彎拉強(qiáng)度試驗(yàn)以及抗壓回彈模量試驗(yàn)等4個(gè)試驗(yàn)評價(jià)材料的力學(xué)特性;采用浸水前后和冰凍前后的抗壓強(qiáng)度比評價(jià)其水穩(wěn)定性和冰凍穩(wěn)定性;采用干縮試驗(yàn)、沖刷試驗(yàn)和膨脹性試驗(yàn)分析材料的耐久性能;通過微觀電鏡試驗(yàn)觀察了干渣和試驗(yàn)所得材料的微觀特征,并進(jìn)行了經(jīng)濟(jì)效益和推廣應(yīng)用前景分析。試驗(yàn)結(jié)果表明:水泥-石灰-干渣半剛性基層材料的最佳配比方案為PB-B-60,水泥4%、石灰2%、干渣粉3%、干渣骨料(4.75mm)60%左右。在此方案下,無側(cè)限抗壓強(qiáng)度為5.38MPa;劈裂強(qiáng)度為0.476MPa;抗壓回彈模量為1451MPa;抗彎拉強(qiáng)度為2.12MPa;軟化系數(shù)為0.922;抗凍BDR為84.43%;養(yǎng)護(hù)90d總干縮應(yīng)變?yōu)?.0193%,總干縮系數(shù)為42.881%;第1時(shí)段沖刷量為14.22g,沖刷率為2.767 g/min,第2時(shí)段分別為8.34g和1.367g/min;膨脹率為0.55%。摻入干渣對材料力學(xué)性能和穩(wěn)定耐久性均有影響,隨著干渣摻量的增加,無側(cè)限抗壓強(qiáng)度和劈裂強(qiáng)度均呈先增加后降低的趨勢。合理干渣的摻入,一方面增大了骨料顆粒之間的內(nèi)摩擦角,另一方面,干渣的摻入使材料內(nèi)部形成大量連通孔隙。水泥水化產(chǎn)物進(jìn)入孔隙凝結(jié)硬化成網(wǎng)狀水泥石,起到纖維加筋作用,從而提高了材料的強(qiáng)度和整體性能。但是,也正由于干渣孔隙較多,自身強(qiáng)度不及優(yōu)質(zhì)碎石,摻量過大則對材料的水穩(wěn)定性、冰凍穩(wěn)定性、干縮性能以及膨脹性能產(chǎn)生負(fù)面影響。本文對水泥-石灰-干渣半剛性基層材料進(jìn)行了室內(nèi)試驗(yàn)研究,得出的材料路用性能均滿足高速公路半剛性基層材料的基本要求,研究結(jié)論為該材料在工程中的應(yīng)用提供技術(shù)支撐,同時(shí)有利于干渣在道路工程中進(jìn)一步推廣和應(yīng)用,達(dá)到資源利用和環(huán)境保護(hù)的目的。
[Abstract]:Dry slag is a kind of solid waste from power plant or ironmaking plant. The utilization ratio of dry slag is low after being broken by magnetic separation, so it is mostly discharged and accumulated in the form of solid waste, which not only occupies the land, but also pollutes the environment. The dry slag particles obtained by crushing, magnetic separation and screening have the properties of rolling crushed stones. However, the application of dry slag in the field of road engineering is limited by many factors, such as the characteristics of water expansion. In order to continue to explore the application of dry slag in road engineering, the author used the dry slag aggregate of 4.75mm to replace part of crushed stone in the framework dense semi-rigid base course, and used the characteristics of rough surface of dry slag and large internal friction angle. Improve the stability of the skeleton. In this paper, cement, lime, dry slag powder and dry slag aggregate are selected to design and test the properties of cement. The purpose of this paper is to explore a new kind of cement-lime-dry slag semi-rigid base material. The mechanical properties of the materials were evaluated by the unconfined compressive strength test, the splitting strength test, the flexural tensile strength test and the compressive resilience modulus test. The compressive strength ratio before and after immersion and before and after freezing was used to evaluate the water stability and freezing stability, and the durability of the material was analyzed by dry shrinkage test, scour test and expansion test. The microscopic characteristics of dry slag and materials were observed by means of microscopic electron microscope test, and the economic benefit and prospect of popularization and application were analyzed. The experimental results show that the optimum ratio of cement-lime-dry slag semi-rigid base material is PB-B-60, cement 4, lime 2, dry slag powder 3 and dry slag aggregate (4.75mm) about 60%. Under this scenario, The unconfined compressive strength was 5.38 MPA; the splitting strength was 0.476 MPA; the compressive resilience modulus was 1451 MPA; the flexural tensile strength was 2.12 MPA; the softening coefficient was 0.922; the frost resistance BDR was 84.43; the total dry shrinkage strain of 90 days was 0.0193 and the total dry shrinkage coefficient was 42.881; the scouring capacity was 14.22 g and the scour rate in the first period was 14.22 g. It was 2.767 g / min, 8.34g / min and 1.367g / min in the second period, respectively, and the expansion rate was 0.55g / min. The mechanical properties and durability of the materials were affected by the addition of dry slag. With the increase of dry slag content, the unconfined compressive strength and splitting strength increased first and then decreased. The reasonable addition of dry slag increases the angle of internal friction between aggregate particles on the one hand, on the other hand, the incorporation of dry slag makes a large number of connected pores in the material. The cement hydration product enters the pore and solidifies to form the network cement stone, which plays the role of fiber reinforcement, thus improving the strength and the overall performance of the material. However, it is also due to the fact that the dry slag has more pores and its own strength is not as good as the high quality crushed stone. Too much content of the dry slag has a negative effect on the water stability, freezing stability, dry shrinkage and expansion performance of the material. In this paper, the material of cement, lime and dry slag semi-rigid base is studied in laboratory. The road performance of the material can meet the basic requirements of semi-rigid base material of expressway. The research results provide technical support for the application of this material in engineering, and it is beneficial to the further popularization and application of dry slag in road engineering, so as to achieve the purpose of resource utilization and environmental protection.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U414
本文編號：2193004
[Abstract]:Dry slag is a kind of solid waste from power plant or ironmaking plant. The utilization ratio of dry slag is low after being broken by magnetic separation, so it is mostly discharged and accumulated in the form of solid waste, which not only occupies the land, but also pollutes the environment. The dry slag particles obtained by crushing, magnetic separation and screening have the properties of rolling crushed stones. However, the application of dry slag in the field of road engineering is limited by many factors, such as the characteristics of water expansion. In order to continue to explore the application of dry slag in road engineering, the author used the dry slag aggregate of 4.75mm to replace part of crushed stone in the framework dense semi-rigid base course, and used the characteristics of rough surface of dry slag and large internal friction angle. Improve the stability of the skeleton. In this paper, cement, lime, dry slag powder and dry slag aggregate are selected to design and test the properties of cement. The purpose of this paper is to explore a new kind of cement-lime-dry slag semi-rigid base material. The mechanical properties of the materials were evaluated by the unconfined compressive strength test, the splitting strength test, the flexural tensile strength test and the compressive resilience modulus test. The compressive strength ratio before and after immersion and before and after freezing was used to evaluate the water stability and freezing stability, and the durability of the material was analyzed by dry shrinkage test, scour test and expansion test. The microscopic characteristics of dry slag and materials were observed by means of microscopic electron microscope test, and the economic benefit and prospect of popularization and application were analyzed. The experimental results show that the optimum ratio of cement-lime-dry slag semi-rigid base material is PB-B-60, cement 4, lime 2, dry slag powder 3 and dry slag aggregate (4.75mm) about 60%. Under this scenario, The unconfined compressive strength was 5.38 MPA; the splitting strength was 0.476 MPA; the compressive resilience modulus was 1451 MPA; the flexural tensile strength was 2.12 MPA; the softening coefficient was 0.922; the frost resistance BDR was 84.43; the total dry shrinkage strain of 90 days was 0.0193 and the total dry shrinkage coefficient was 42.881; the scouring capacity was 14.22 g and the scour rate in the first period was 14.22 g. It was 2.767 g / min, 8.34g / min and 1.367g / min in the second period, respectively, and the expansion rate was 0.55g / min. The mechanical properties and durability of the materials were affected by the addition of dry slag. With the increase of dry slag content, the unconfined compressive strength and splitting strength increased first and then decreased. The reasonable addition of dry slag increases the angle of internal friction between aggregate particles on the one hand, on the other hand, the incorporation of dry slag makes a large number of connected pores in the material. The cement hydration product enters the pore and solidifies to form the network cement stone, which plays the role of fiber reinforcement, thus improving the strength and the overall performance of the material. However, it is also due to the fact that the dry slag has more pores and its own strength is not as good as the high quality crushed stone. Too much content of the dry slag has a negative effect on the water stability, freezing stability, dry shrinkage and expansion performance of the material. In this paper, the material of cement, lime and dry slag semi-rigid base is studied in laboratory. The road performance of the material can meet the basic requirements of semi-rigid base material of expressway. The research results provide technical support for the application of this material in engineering, and it is beneficial to the further popularization and application of dry slag in road engineering, so as to achieve the purpose of resource utilization and environmental protection.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U414
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