碱性矿料水泥混凝土的抗冻性研究

发布时间：2018-06-26 04:27

本文选题：冻融破坏 + 石灰岩　；参考：《北华大学》2016年硕士论文

【摘要】：目前,混凝土材料广泛应用于各个领域,在园林工程中也大量应用,对于暴露在冬季严寒环境下的园林路面混凝土工程,冻融破坏是混凝土路面耐久性问题的一个重要原因。本文从集料岩性方面入手,采用碱性矿料作为骨料来分析混凝土的抗冻耐久性能。本文主要通过碱性矿料石灰岩(SiO2含量为1.01%)和中基性矿料玄武岩(SiO2含量为53.5%)进行试验对比。在进行混凝土强度实验时利用正交试验,采用等比容重的配合比设计方法,从粗集料的级配范围、水胶比、胶凝材料用量、砂率四个因素,确定碱性矿料石灰岩混凝土通过最佳配合比设计能够达到施工中强度要求。针对抗冻实验主要分为两个部分:(1)胶砂抗冻实验,通过胶砂实验首先分析碱性细骨料对抗冻性能的改善。(2)水泥混凝土抗冻实验,在进行混凝土抗冻实验时采用粗集料级配中“细”级配范围,水胶比为0.32%,砂率为43%,胶凝材料用量为470(kg/m3)的配合比,分析石灰岩粗骨料对混凝土抗冻性能的提高优于玄武岩混凝土。在进行抗冻实验时为了符合工程实际和能够多组分析对比讨论,合理添加了矿物掺合料:粉煤灰15%、矿渣20%,硅灰7%。其中抗冻实验数据主要通过相对动弹性模量和质量损失率进行对比分析。在实验的最后通过混凝土抗冻试验件进行吸水率实验,以及利用TORRRNT渗透仪对试件进行渗透性实验来评价碱性矿料混凝土的耐久性能。通过上述研究,用碱性矿料石灰岩作为水泥混凝土的骨料可以配置出力学性能、抗冻耐久性能良好的混凝土,证明从骨料岩性角度可以提升混凝土的抗冻性,这对提高混凝土抗冻耐久性方面具有重要意义。
[Abstract]:At present, concrete materials are widely used in various fields, and are also widely used in garden engineering. Freeze-thaw damage is an important reason for durability of concrete pavement. In this paper, from the point of view of aggregate lithology, alkaline mineral aggregate is used as aggregate to analyze the frost resistance and durability of concrete. In this paper, the comparison between alkaline limestone (1.01wt% Sio _ 2) and basalt (53.5% Sio _ 2) is carried out. In the strength test of concrete, the orthogonal test is used, and the design method of equal specific bulk density is adopted. The four factors are the gradation range of coarse aggregate, the ratio of water to binder, the amount of cementing material and the sand rate. It is determined that the alkali limestone concrete can meet the requirements of construction strength through the optimum mix ratio design. The experiment is mainly divided into two parts: (1) the test of anti-freezing of cement-sand. Firstly, the improvement of the frost resistance of alkaline fine aggregate is analyzed through the experiment of cement-sand. (2) the experiment of anti-freezing of cement concrete. In this paper, the "fine" gradation range of coarse aggregate gradation is adopted, the ratio of water to binder is 0.32, the sand ratio is 43, and the amount of cementing material is 470 (kg/m3). It is analyzed that limestone coarse aggregate improves the frost resistance of concrete better than basalt concrete. In order to accord with the engineering practice and to be able to analyze and discuss in many groups, the mineral admixture of fly ash 15, slag 20 and silica fume 7 are added reasonably. The experimental data of frost resistance are mainly analyzed by comparing the relative dynamic modulus of elasticity and the loss rate of mass. At the end of the experiment, the water absorbency test was carried out by the concrete antifreezing test piece, and the durability of alkaline mineral aggregate concrete was evaluated by the permeability test of the specimen with Torrent osmometer. Through the above research, using alkaline limestone as the aggregate of cement concrete can configure the concrete with good mechanical properties and durability. It is proved that the freezing resistance of concrete can be improved from the point of view of aggregate lithology. This is of great significance in improving the frost durability of concrete.
【学位授予单位】：北华大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U414;TU986.42

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