矿物和有机添加剂复合石膏粘结剂的结构形成特征

Azmi Othman, N. Chernysheva, M. Drebezgova, E. Kovalenko, S. Vasheva
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引用次数: 3

摘要

对于动态发展的低层建筑行业,越来越需要扩大建筑材料的范围,包括快速硬化类型的粘合剂。复合石膏粘结剂是有效的,包括精心挑选的石膏粘结剂,波特兰水泥和活性矿物添加剂的混合物。以它们为基础的材料迅速硬化并获得所需的强度。当在复合材料中使用矿物和化学添加剂时,这种类型的粘合剂的性能特性得到了提高。这有助于调节其结构形成和硬化过程,这取决于组分的活性,水需求的变化,以及化学添加剂的消化,吸附和空气夹持作用。本文研究了化学添加剂——高效减水剂MARF SU 84、MELFLUX 5581 F和缓凝剂PE——对一种硬化复合石膏粘结剂的物理力学性能的影响,该粘结剂包括石膏粘结剂、硅酸盐水泥和复合矿物成分(细石英砂、梅高岭土VMK-45、石灰石粉尘)。讨论了其结构过程的管理问题。研究表明,石英砂、VMK-45偏陶土和石灰石粉尘中分散较细的矿物添加剂是生产复合石膏粘结剂的有效组分。开发的复合化学添加剂MARFSU 84 (0.1%)+PlastRetard PE(0.08%)和MELFLUX 5581 F (0.1%)+PlastRetard PE(0.08%)可以显著减缓石膏水泥混合物的开始和结束凝结,最高可达45…28d后,KGV的抗压强度分别提高1.5 ~ 1.6倍(达到18.3 ~ 20.4 MPa)。
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FEATURES OF STRUCTURE FORMATION OF COMPOSITE GYPSUM BINDERS WITH A COMPLEX OF MINERAL AND ORGANIC ADDITIVES
For the dynamically developing low-rise construction industry, there is a growing need to expand the range of building materials, including fast-hardening types of binders. Composite gypsum binders are effective, including a carefully selected mixture of gypsum binder, Portland cement and active mineral additives. Materials based on them harden quickly and gain the required strength. An increase in the performance characteristics of this type of binders is achieved when mineral and chemical additives are used in a complex. This helps to regulate the processes of their structure formation and hardening, depending on the activity of the components, changes in water demand, as well as the peptizing, adsorption and air-entrapping effects of chemical additives. The article presents the results of a study of the effect of chemical additives – superplasticizers MARF SU 84, MELFLUX 5581 F and the retarder of the setting time of PlastRetard PE – on the physico-mechanical properties of a hardened composite gypsum binder, including gypsum binder, Portland cement and a complex of mineral components (fine quartz sand, metacaolin VMK-45, limestone dust). The issues of management of its structuring processes are considered. It has been established that finely dispersed mineral additives from quartz sand, VMK-45 metacaolin and limestone dust are effective components for the production of composite gypsum binders. The developed complex chemical additives MARFSU 84 (0.1%)+PlastRetard PE (0.08%) and MELFLUX 5581 F (0.1%)+ PlastRetard PE (0.08%) can significantly slow down the beginning and end of setting of gypsum cement mixtures up to 45...48 min and increase the compressive strength of the hardened KGV after 28 days by 1.5 ...1.6 times (up to 18.3...20.4 MPa), respectively.
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