天然集料路用混凝土性能研究及成本分析

发布时间：2018-03-11 04:39

本文选题：天然集料路用混凝土　切入点：天然卵石混凝土　出处：《中国海洋大学》2015年硕士论文　论文类型：学位论文

【摘要】：近年来,公路建设规模不断扩大,交通基础设施逐步完善。然而路面缺棱少角、裂缝断板的现象经常会发生,因此需要寻求有效途径使公路的使用性能得到改善,使用寿命进一步延长。我国海岸线长,天然卵石资源较为丰富,但是应用在公路中并不广泛。本文通过系统研究天然卵石混凝土的性能,对其技术可行性论证。并通过天然卵石混凝土公路工程项目在全寿命周期内成本的分析,评估其在经济上的合理性。为了研究天然卵石路用混凝土的性能,本文设置了天然卵石混凝土和普通碎石混凝土这两种混凝土力学性能对比试验和耐久性能对比试验。为了保证试验结果更好地应用于工程实际中,首先对试验中的原材料进行了一系列基本性能的测定,然后控制天然卵石混凝土和普通碎石混凝土流动性相同这一条件,确定出两种混凝土的配合比。力学性能对比试验的设计思路是配制不同强度等级的混凝土试件,进行抗压强度试验和抗折强度试验,对比两种混凝土试件的强度差异。耐久性能对比试验包括干缩性能对比试验和冻融性能对比试验。干缩性能对比试验的设计思路是选取流动性相同的天然卵石混凝土配合比和普通碎石混凝土配合比配制混凝土试件,测定试件的干缩系数这一指标,从而得出混凝土的干缩性能。冻融性能对比试验的设计思路是选取流动性相同的天然卵石混凝土配合比和普通碎石混凝土配合比配制混凝土试件,分别测定试件在不同冷冻和融化循环下的横向基频并称其质量,通过质量损失率这一指标评价混凝土的抗冻性能。对天然卵石路用混凝土公路工程成本的研究是从工程项目全寿命周期的角度进行的。首先构建了全寿命周期成本计算模型,包括建设成本计算模型、运营成本计算模型、拆除成本计算模型、环境影响成本计算模型、社会影响成本计算模型。然后通过工程实例分别计算天然卵石混凝土公路项目和普通碎石混凝土公路项目的全寿命周期成本。通过两种混凝土公路下的成本分析,评价天然卵石混凝士在公路工程项目中的成本。本文通过以上对天然卵石路用混凝土性能和成本的研究,得出天然卵石混凝土路用性能良好,而且不论是力学性能还是耐久性能都在一定程度上优于普通碎石混凝土。另外从经济性的角度,天然卵石混凝土公路全寿命成本与普通碎石混凝土公路相比要低。这为天然卵石混凝土用于公路工程项目提供了理论指导,使天然卵石能更多地得到利用。
[Abstract]:In recent years, the scale of highway construction continues to expand, and the traffic infrastructure is gradually improved. However, the phenomenon of pavement lacking edges and less angles, cracks and broken plates often occurs. Therefore, it is necessary to find effective ways to improve the performance of the highway. The service life of our country is extended further. Our country has a long coastline and abundant natural pebble resources, but it is not widely used in highway. This paper systematically studies the performance of natural pebble concrete. Through the analysis of the cost of the natural pebble concrete highway project in the whole life cycle, the economic rationality of the natural pebble concrete highway project is evaluated. In order to study the performance of the natural pebble road concrete, In this paper, two kinds of concrete, natural pebble concrete and ordinary crushed stone concrete, have been set up to compare their mechanical properties and durability, in order to ensure that the test results are better applied in engineering practice. First, a series of basic properties of the raw materials in the test were measured, and then the fluidity of natural pebble concrete and ordinary crushed stone concrete was controlled under the same condition. The design idea of the contrast test of mechanical properties is to prepare concrete specimens of different strength grades to carry out compressive strength test and flexural strength test. The strength differences between the two concrete specimens are compared. The durability contrast tests include dry shrinkage test and freeze-thaw performance comparison test. The design idea of the dry shrinkage performance contrast test is to select the natural pebble mixture with the same fluidity. Compounding concrete specimens with compounding ratio of solidified soil and ordinary crushed stone concrete, Measuring the dry shrinkage coefficient of the specimen, The design idea of the contrast test of freeze-thaw performance is to select the mixture ratio of natural pebble concrete with the same fluidity and the mix ratio of ordinary crushed stone concrete to prepare concrete specimen. The transverse fundamental frequencies of the specimens under different freezing and melting cycles were measured and called mass, The research on the engineering cost of natural pebble road concrete highway is carried out from the point of view of the whole life cycle of the engineering project. First, the calculation model of the whole life cycle cost is constructed. Including construction cost calculation model, operation cost calculation model, demolition cost calculation model, environmental impact cost calculation model, The calculation model of social impact cost is used to calculate the whole life cycle cost of natural pebble concrete highway project and ordinary crushed stone concrete highway project through engineering examples. The cost of natural pebble coagulant in highway project is evaluated. Through the study of the performance and cost of natural pebble concrete, it is concluded that the natural pebble concrete has good pavement performance. And both mechanical and durable properties are to some extent superior to those of ordinary crushed stone concrete. In addition, from an economic point of view, The whole life cost of natural pebble concrete highway is lower than that of ordinary crushed stone concrete highway, which provides theoretical guidance for natural pebble concrete to be used in highway engineering projects and makes natural pebble more useful.
【学位授予单位】：中国海洋大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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