A kind of clear-water concrete chemical admixture and preparation method thereof

Abstract

The invention discloses a bare concrete chemical additive and a preparation method thereof. The bare concrete chemical additive comprises the following components in percentages by weight: 9.0% to 13.0% of a VPEG type polycarboxylate superplasticizer, 0.8% to 2.0% of a viscosity modifier, 0.1% to 0.3% of a defoamer, 3.0% to 7.0% of an anti-mud agent, 1.0% to 3.5% of a retarder, 0.03% to 0.05% of apreservative and 75.2% to 84.2% of water. The bare concrete chemical additive disclosed by the invention is a light yellow liquid reagent, and is compounded by adding functional modified components on the basis of specific composition VPEG type polycarboxylate superplasticizer; and by using the bare concrete chemical additive, the peaceability and plasticity-maintaining performance of the novel bare concrete chemical additive can be obviously improved, the macroscopic defects of bare concrete die surface are reduced, and the strength and durability of concrete structure are improved.

Description

technical field [0001] 本发明属于混凝土外加剂领域,具体涉及到一种清水混凝土化学外加剂。 Background technique [0002] 清水混凝土是一次浇筑成型,表面不做任何人为装饰,直接以混凝土的原浇筑表面作为饰面层,与普通混凝土相比,其对外观质量的要求更高,需要混凝土表面平整光洁,色泽均匀一致,无明显可见气泡、外伤致损和污染现象。清水混凝土体现的是一种材料最本质的美感,随着国内绿色建筑的客观需求及人们环保意识的不断增强,清水混凝土的应用范围也逐渐由桥梁、厂房、机场等扩大到工业与民用建筑领域。然而,由于清水混凝土的表面不再添加饰面层,将直接接受各种气候条件和腐蚀介质的侵蚀,因此要长久保持建筑物的表观质感,这就对清水混凝土材料自身的耐候性和耐久性提出了更为严格的要求。 [0003] 混凝土外加剂是指在混凝土拌合前或拌合过程中掺入用以改善混凝土性能的物质,是混凝土中不可或缺的组分,行业内通常将其称为混凝土的第五组分,绝大多数高性能混凝土制备的关键技术既是化学外加剂的开发。 [0004] 清水混凝土常见的质量通病,如表观气泡多、色彩均匀性差、耐久性不良等除配合比设计不合理外,更为重要的是外加剂的质量问题。目前,市面上的一些清水混凝土外加剂产品,仅仅是在普通混凝土产品的基础上掺入了适量的消泡剂,存在与原材料的适应性差、对原材料及模板的质量和施工工艺要求高的问题,并且在脱模后,通常都要进行表观的二次修复处理,极大的限制了清水混凝土的大规模应用。因此,为平衡清水混凝土的内在需求与整体性能之间的矛盾,亟需开发出一种高性能清水混凝土化学外加剂。 Contents of the invention [0005] 本发明所要解决的技术问题是针对上述现有技术存在的不足而提供一种清水混凝土化学外加剂及其制备方法,可显著改善新拌清水混凝土的和易性及保塑性,降低清水混凝土模面的宏观缺陷,提高混凝土结构物的强度及耐久性。 [0006] The technical scheme that the present invention adopts for solving the above-mentioned problem is: [0007] 一种清水混凝土化学外加剂,由VPEG型聚羧酸减水剂、粘度调节剂、...

AI Technical Summary

Problems solved by technology

At present, some fair-faced concrete admixture products on the market are only mixed with an appropriate amount of defoaming agent on the basis of ordinary concrete products, which have the problems of poor adaptability to raw materials, high requirements on the quality of raw materials and formwork and construction technology , and after demoulding, it is usually necessary to carry out secondary repair treatment on the surface, which greatly limits the large-scale application of fair-faced concrete

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