干硬性混凝土路缘石的应用研究

发布时间：2018-02-24 04:50

本文关键词： 干硬性混凝土路缘石配合比设计耐久性抗氯离子渗透　出处：《吉林大学》2015年硕士论文　论文类型：学位论文

【摘要】：近年来我国交通基础设施发展迅猛,各级公路建设如火如荼。路缘石作为道路结构中的重要组成部分,需求量也在不断增大。路缘石的设置不仅起到导向、连接和便于排水的作用,而且对于路面施工及路肩的稳定有一定帮助,因而其耐久性关系着公路的畅通和运行安全。目前常用的路缘石有岩石类路缘石和混凝土类路缘石,岩石类路缘石力学性能好、耐腐蚀,但造价高,很难在公路上大规模应用。而混凝土预制块路缘石抵御自然气候条件连续冻融破坏和除雪剂所造成的腐蚀破坏能力较差,导致使用寿命短,养护维修成本较高。干硬性混凝土具有水灰比低、早期强度高及成型速度快等特点,因而在压实成型后可立即拆模提升模板周转速率与生产效率。干硬性混凝土的高效率与经济性使其在土木工程中得到了广泛应用,但是其在路缘石的应用研究上还未成熟。为了进一步推广干硬性混凝土路缘石的应用,提升其耐久性,本文对干硬性混凝土路缘石进行了系统的试验研究,具体研究内容及成果如下:本文首先从干硬性混凝土的配合比设计入手,通过对混凝土级配设计理论以及配合比设计方法的比选,根据最大密度曲线理论进行级配的计算及评价分析。因为干硬性混凝土水灰比较低,成型方式与普通混凝土有所区别,因此其配合比设计不能简单的采用普通混凝土相关设计方法。本文参照《现代混凝土配合比设计手册》中相关方法,并结合试验验证,最后得到力学性能较优的路缘石生产配合比。干硬性混凝土采用振动压实成型,从而保证其能够成型后立即脱模,并通过蒸汽养生,保证其早期强度的快速形成。因而干硬性混凝土路缘石的制备工艺及养生工艺对其成品质量的好坏有着重要影响。本文结合吉林久盛生态环境科技股份有限公司自主设计制造的混凝土砌块成型机生产干硬性混凝土路缘石,通过对其生产过程及养护过程中主要影响参数进行分析,充分发挥该成型机特点,使得各参数组合后得到最大的生产效率与生产质量。对初选得到的两组干硬性混凝土路缘石配合比试件耐久性能进行试验研究,分析其抗冻融性能与抗氯离子渗透性能,对其耐久性进行评价,并比选出最终干硬性混凝土生产配合比。试验结果表明两组配合比试件性能均能满足使用要求,其中水灰比为0.37时配合比制备试件性能更好。最后结合安龙泉互通立交桥建设工程,铺设干硬性混凝土路缘石试验段对其使用性能进行了验证。通过跟踪调查发现,干硬性混凝土路缘石应用效果良好,其抗冻融破坏耐久性比普通混凝土要好,具有长期稳定性,适用于东北等季节性冻土区。
[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.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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