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首页> 外文会议>2nd International RILEM Symposium on Adhesion between Polymers and Concrete, 2nd, Sep 14-17, 1999, Dresden, Germany >ENHANCEMENT OF ADHESION OF CEMENTITIOUS-RENDERING TO CONCRETE BY POLYMERIC ADDITIVES
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ENHANCEMENT OF ADHESION OF CEMENTITIOUS-RENDERING TO CONCRETE BY POLYMERIC ADDITIVES

机译：聚合物助剂增强水泥胶凝性

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The use of cementitios rendering materials for concrete structures is a common practice in the local building industry. The concrete-block walls are usually coated by a single or double layer of the cementitous mixture in order to seal the wall, to give it a smoother texture and to form a proper substrate for paint or polymeric coating. To improve the adhesion of the stucco layer to the subtrate and avoid detachment and delamination failures, a polymer component is usually added to the mixture, and a polymer primer layer is used as a bond promoter. It was the purpose of this work to study the effect of these additives on the adhesion of the rendering to the substrate. Various polymer-cement compositions were, hence, applied on concrete substrates with and without a primer layer and the adhesion-strength was measured by the pull-off test. In addition to these variables the effect of the curing conditions on the adhesion was also investigated. The main results suggest that: 1. In general, the polymeric additive substantially improves the adhesion strength of the rendering layer to the substrate. Thus for example, the pull-off strength of a mixture which does not contain any polymer is about 1-1.2 MPa, whereas that of a mixture containing 10% polymer is more than double. Furthermore, the pull-off failure does not occurs in the interface but rather within one of the adherents suggesting that the real adhesion strength is even higher. 2. When a polymeric primer is applied on the concrete substrate, forming a polymeric film on the surface, the adhesion strength of a pure cementitious mixture increases from 1.2 MPa to 2.3 MPa suggesting that the polymer layer is a good binding layer. 3. The curing, too, has an important effect on the adhesion quality and strength of the polymer containing mixture to the concrete. A system which was not cured at all by proper wetting developed only poor adhesion (about 0.5 MPa). It seems that the cement hydration has an important roll in the adhesion phenomenon even when polymer materials promote the adhesion.
机译：在混凝土结构中使用水泥基提质材料是当地建筑业的普遍做法。混凝土砌块的墙通常用单层或双层的胶结混合物进行涂覆，以密封墙，使其具有较光滑的质地，并形成用于油漆或聚合物涂料的合适基材。为了改善灰泥层对底物的粘附力并避免分离和分层失败，通常将聚合物组分添加到混合物中，并将聚合物底漆层用作粘合促进剂。这项工作的目的是研究这些添加剂对抹灰与底材的附着力的影响。因此，将各种聚合物-水泥组合物施涂在具有和不具有底漆层的混凝土基材上，并通过拉拔试验来测量粘合强度。除了这些变量之外，还研究了固化条件对附着力的影响。主要结果表明：1.总的来说，聚合物添加剂可显着提高着色层与基材的粘合强度。因此，例如，不包含任何聚合物的混合物的抗拉强度约为1-1.2 MPa，而包含10％聚合物的混合物的抗拉强度是两倍以上。此外，剥离失败不是在界面中发生，而是在其中一种粘附剂中发生，这表明实际的粘附强度甚至更高。 2.当在混凝土基材上施加聚合物底漆，在表面上形成聚合物膜时，纯胶凝混合物的粘合强度从1.2 MPa增加到2.3 MPa，表明该聚合物层是良好的粘合层。 3.固化对含聚合物的混合物与混凝土的粘合质量和强度也有重要影响。不能通过适当润湿完全固化的体系只会产生较差的附着力（约0.5 MPa）。似乎即使在聚合物材料促进粘合性的情况下，水泥水合也对粘合现象具有重要的影响。

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