混凝土减胶剂的性能研究
发布时间：2019-02-24 09:59
【摘要】：外加剂是现代混凝土必不可少的组分之一,有些学者甚至称其为混凝土的第五元素。因此使用高效高性能减水剂业已成为我国混凝土行业的发展趋势。混凝土减胶剂作为新一代的混凝土外加剂,能够更好的改善混凝土的性能,减少单方混凝土中的胶凝材料用量。在掺加减水剂的基础上,减胶剂能够更好地发挥其减胶的性能。本文通过检测掺加减胶剂的混凝土性能试验,研究减胶剂对混凝土工作性和耐久性能的影响,同时通过新拌水泥浆体的粒径分析,分析减胶剂的减胶原理,认为减胶剂可以进一步打开絮凝结构,促进水泥水化。结果证明减胶剂能够改善新混凝土拌合物的工作性,28天的抗压强度可以提高18%。Ⅰ型减胶剂后期抗压强度略高于Ⅱ型减胶剂,但是差距不是很大。Ⅰ型减胶剂的最大减胶率为10.5%左右,Ⅱ型的减胶剂的减胶率为14.2%左右,Ⅱ型减胶剂要比Ⅰ型减胶剂的减胶效果好,但是用量比Ⅰ型减胶剂稍微大些。在抗压强度方面Ⅰ型减胶剂3天抗压强度最大相差18%,7天抗压强度最大相差17%,Ⅱ型减胶剂3天抗压强度最大相差11%,7天抗压强度最大相差16%;两种类型减胶剂的最大减胶率对应的3天强度分别为16.1 MPa和15.2 MPa,7天强度分别为20.6 MPa和19.8 MPa,Ⅱ型减胶剂的抗压强度比Ⅰ型减胶剂稍微偏小,不过随着减胶剂掺量的变化,Ⅱ型减胶剂的混凝土抗压强度比Ⅰ型稳定。研究表明,Ⅱ型减胶剂的28天抗压强度比Ⅰ型的高,但大部分都比基准强度略底,Ⅰ型减胶剂最大减胶率对应的28天抗压强度为37.5MPa,Ⅱ型的为36.9 MPa,分别与基准相差1.6%和3.1%。提高混凝土的耐久性,减少胶凝材料的用量,减少水泥混凝土行业碳排放,对我国建筑行业的可持续发展有较大的积极意义。
[Abstract]:Admixture is an essential component of modern concrete, and some scholars even call it the fifth element of concrete. Therefore, the use of high-efficiency and high-performance water-reducing agent has become the development trend of our country's concrete industry. As a new generation of concrete admixture, concrete antiglue can better improve the performance of concrete and reduce the amount of cementitious material in unilateral concrete. On the basis of adding water reducing agent, the glue reducer can better exert its property of reducing glue. In this paper, the influence of antiglue on the workability and durability of concrete is studied by testing the concrete performance of adding reducer. At the same time, through the particle size analysis of fresh cement paste, the principle of reducing glue is analyzed. It is considered that the gel reducer can further open the flocculation structure and promote the hydration of cement. The results show that the adhesive can improve the workability of new concrete mixture, and the compressive strength of 28 days can be increased by 18%. The compressive strength of type 鈪，
本文编号：2429443
[Abstract]:Admixture is an essential component of modern concrete, and some scholars even call it the fifth element of concrete. Therefore, the use of high-efficiency and high-performance water-reducing agent has become the development trend of our country's concrete industry. As a new generation of concrete admixture, concrete antiglue can better improve the performance of concrete and reduce the amount of cementitious material in unilateral concrete. On the basis of adding water reducing agent, the glue reducer can better exert its property of reducing glue. In this paper, the influence of antiglue on the workability and durability of concrete is studied by testing the concrete performance of adding reducer. At the same time, through the particle size analysis of fresh cement paste, the principle of reducing glue is analyzed. It is considered that the gel reducer can further open the flocculation structure and promote the hydration of cement. The results show that the adhesive can improve the workability of new concrete mixture, and the compressive strength of 28 days can be increased by 18%. The compressive strength of type 鈪，
本文编号：2429443
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