Sustainable rehabilitation of stone architectural heritage and repair of cracks in concrete require the development of new compatible repair mortars. In addition, recycling industrial waste has become an attractive solution to environmental problems. In this context, the aim of this paper is to study the influence of addition of a new polymer latex (styrene-polyacrylic latex (SPA)), on the physico-mechanical properties and microstructure of limestone mortars mainly based on crushing waste as aggregate. Four SPA latex modified mortars were prepared with different mass “Polymer/Cement” ratios (P/C), 2.5%, 5%, 7.5% and 10%, and compared with ordinary limestone mortar. The tested parameters are: workability, mechanical strength, water absorption, and microstructure. The objective is to search the best composition which may be suitable for the uses mentioned above. The obtained results show that the addition of SPA latex significantly improves the workability and reduces the ‘W/C’ ratio. An increase in SPA latex dosage from 7.5% to 10% significantly increases the flexural tensile strength at 90days. However, the compressive strength is almost inversely proportional to the ‘P/C’ ratio. The XRD analysis reveals that the SPA latex increases the intensities of the cement hydrates such as ettringite. In addition, the SEM analysis shows that the structure of the modified mortars appears more compact and their hydrates are more attached, in comparison with that of the control mortar, which seems to be loose. Finally, it should be noted that 7.5% of SPA latex seems to constitute the best compromise between the studied properties. Consequently, the use of PMM7.5% as repair, finishing and rehabilitation materials for civil engineering works is very useful.

石材建筑遗产的可持续修复和混凝土裂缝的修复需要开发新的兼容修补砂浆。另外，回收工业废物已经成为解决环境问题的有吸引力的解决方案。在这种情况下，本文的目的是研究添加一种新的聚合物胶乳（苯乙烯-聚丙烯酸胶乳（SPA））对石灰石砂浆的物理力学性能和微观结构的影响，这些胶乳砂浆主要以碎石为碎料。制备了四种SPA胶乳改性砂浆，它们与普通石灰石砂浆相比，具有不同的质量“聚合物/水泥”比（P / C），2.5％，5％，7.5％和10％。测试的参数为：可加工性，机械强度，吸水率和微观结构。目的是寻找可能适合上述用途的最佳组合物。所得结果表明，添加SPA胶乳可显着改善可加工性并降低“ W / C”比。SPA胶乳剂量从7.5％增加到10％可以显着提高90天时的抗弯强度。但是，抗压强度几乎与“ P / C”比成反比。XRD分析表明，SPA胶乳增加了水泥水合物如钙矾石的强度。另外，SEM分析表明，与对照砂浆相比，改性砂浆的结构看起来更致密，并且它们的水合物更附着，而对照砂浆似乎是疏松的。最后，应注意的是7。5％的SPA乳胶似乎是所研究性能之间的最佳折中方案。因此，将PMM7.5％用作土木工程的维修，整理和复原材料非常有用。