Abstract Polymeric latexes are commonly used in cement-based plastering and rendering works. This paper assesses the effect of recycled polymers obtained from waste latex paints (WLPs) on flowability and mechanical properties of masonry cement (MC) mortars, including whether such performance would be similar to that induced by virgin polymers. Three MC classes prepared with different cement-to-limestone ratios are produced in compliance to relevant EN 413-1 and ASTM C91 specifications. The WLPs were not obtained from waste collection sites, rather produced to monitor constituents and properties prior to use. Test results showed that water retention and rheological properties of mortars containing virgin or recycled polymers are remarkably higher than unmodified mixtures. The mechanical properties of WLP-modified mortars including compression, flexure, and pull-off adhesion strength were pretty similar, or even higher than equivalent mixtures containing virgin polymers. This was attributed the presence of ultrafine pigment and extender particles that improve packing density and infer nucleation benefits for the growth of additional hydrates. The dry curing regime applied for virgin and recycled polymer-modified mortars is particularly advantageous in construction sites, as this reduces the hassle of moist curing normally required for unmodified plasters while securing higher resistance against sorptivity and shrinkage cracks.

中文翻译：

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用于抹灰应用的砌筑水泥中的增值废乳胶漆

摘要 聚合物乳胶常用于水泥基抹灰和抹灰工程。本文评估了从废乳胶漆 (WLP) 中获得的回收聚合物对砌筑水泥 (MC) 砂浆流动性和机械性能的影响，包括这种性能是否与原始聚合物产生的性能相似。根据相关的 EN 413-1 和 ASTM C91 规范生产了三种不同水泥与石灰石比例的 MC 等级。WLP 不是从废物收集场所获得的，而是用于在使用前监测成分和特性的。测试结果表明，含有原生聚合物或再生聚合物的砂浆的保水性和流变性能明显高于未改性混合物。WLP 改性砂浆的力学性能，包括压缩、弯曲和拉脱粘合强度非常相似，甚至高于含有原始聚合物的等效混合物。这归因于超细颜料和体质颜料颗粒的存在，它们提高了堆积密度并推断出对额外水合物生长的成核益处。应用于原始和回收聚合物改性砂浆的干固化方案在建筑工地特别有利，因为这减少了未改性灰泥通常需要的湿固化的麻烦，同时确保对吸着性和收缩裂缝的更高抵抗力。这归因于超细颜料和体质颜料颗粒的存在，它们提高了堆积密度并推断出对额外水合物生长的成核益处。应用于原始和回收聚合物改性砂浆的干固化方案在建筑工地特别有利，因为这减少了未改性灰泥通常需要的湿固化的麻烦，同时确保对吸着性和收缩裂缝的更高抵抗力。这归因于超细颜料和体质颜料颗粒的存在，它们提高了堆积密度并推断出对额外水合物生长的成核益处。应用于原始和回收聚合物改性砂浆的干固化方案在建筑工地特别有利，因为这减少了未改性灰泥通常需要的湿固化的麻烦，同时确保对吸着性和收缩裂缝的更高抵抗力。