再生骨料混凝土力学性能研究

发布时间：2018-05-27 22:42

本文选题：再生混凝土 + 水灰比　；参考：《西安理工大学》2017年硕士论文

【摘要】：随着水利建筑行业不断发展,大量的混凝土运用在水利工程建设中。在水工混凝土建筑物拆除的时候,如何处理大量的混凝土建筑垃圾成为目前全世界关注的问题。因此废弃混凝土的再生利用已经成为目前全世界公认绿色环保的建筑垃圾处理途径。为了在这一领域做出贡献,本文研究再生混凝土在不同水灰比、不同再生混凝土取代率、不同养护龄期、不同粉煤灰替代水泥掺量、不同再生骨料母体、混凝土强度下对再生混凝土抗压强度以及劈裂抗拉强度的影响。本文首先根据前人的研究成果,对再生混凝土骨料的特性以及再生混凝土的配合比进行了系统分析;然后,通过再生混凝土抗压强度试验,分析各个因素对再生混凝土抗压强度的影响;通过再生混凝土劈裂抗拉强度试验,分析各个因素对再生混凝土劈裂抗拉强度的影响。研究结果表明:(1)随着再生粗骨料取代率的不断增大,混凝土的抗压及劈裂抗拉强度随之降低。(2)水灰比对再生混凝土的抗压及劈裂抗拉强度影响较大,随着水灰比的减小,再生混凝土的抗压及劈裂抗拉强度提高。(3)再生骨料母体混凝土强度高能显著提高再生混凝土抗压及劈裂抗拉强度,随着再生骨料母体混凝土强度的不断提高,再生混凝土的抗压及劈裂抗拉强度也随着提高。(4)粉煤灰替代水泥对再生混凝土抗压及劈裂抗拉强度产生不利影响,随着粉煤灰替代量的增加,再生混凝土的抗压及劈裂抗拉强度都有不同程度的减少。 (5)混凝土的养护龄期对再生混凝土抗压及劈裂抗压强度影响较大,随着混凝土养护龄期的增加,再生混凝土的抗压及劈裂抗拉强度随着增加,但是增加的幅度随着时间的增长而逐渐减少。本文的研究方法对类似工程问题的研究具有借鉴意义;本文的研究成果,对实际工程具有较好的参考和应用价值。
[Abstract]:With the continuous development of water conservancy construction industry, a large number of concrete is used in water conservancy construction. During the demolition of hydraulic concrete buildings, how to deal with a large number of concrete construction wastes has become a problem of concern all over the world. Therefore, recycling of waste concrete has been recognized as a green and environmentally friendly disposal way of construction waste. In order to make a contribution in this field, this paper studies the recycled concrete in different water-cement ratio, different recycled concrete replacement rate, different curing age, different fly ash replacement cement content, different recycled aggregate mother body. Effect of concrete strength on compressive strength and splitting tensile strength of recycled concrete. In this paper, the characteristics of recycled concrete aggregate and the mix ratio of recycled concrete are systematically analyzed according to the previous research results, and then the compressive strength test of recycled concrete is carried out. The influence of various factors on the compressive strength of recycled concrete is analyzed, and the influence of each factor on the splitting tensile strength of recycled concrete is analyzed through the splitting tensile strength test of recycled concrete. The results show that with the increasing replacement ratio of recycled coarse aggregate, the compressive and splitting tensile strength of concrete decreases. The water-cement ratio has a great effect on the compressive and splitting tensile strength of recycled concrete, and decreases with the decrease of water-cement ratio. The compressive and splitting tensile strength of recycled concrete is improved. 3) the high strength of recycled aggregate matrix concrete can significantly improve the compressive and split tensile strength of recycled concrete, and with the increasing of recycled aggregate matrix concrete strength, The compressive and splitting tensile strength of recycled concrete also increased with the increase of the replacement of fly ash for cement, and the compressive and splitting tensile strength of recycled concrete increased with the increase of the replacement amount of fly ash. The compressive strength and splitting tensile strength of recycled concrete are reduced to some extent. (5) the curing age of concrete has great influence on the compressive and splitting compressive strength of recycled concrete, and with the increase of curing age, the compressive and splitting tensile strength of recycled concrete increases with the increase of curing age. But the increase has diminished over time. The research method of this paper has reference significance to the research of similar engineering problems, and the research results of this paper have good reference and application value to practical engineering.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528

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