Shrinkage-reducing admixture has been proved as the best solution to reduce the shrinkage cracks on the surface of the concrete. Various shrinkage-reducing admixtures available in the local market are chemical, highly hazardous, and limited use in concrete. In the present research, rubber latex was used by replacing water up to 2% in geopolymer concrete. Volumetric shrinkage for geopolymer concrete with different doses of rubber latex was determined and compared those results with traditional cement concrete of the same mix. The relation between volumetric shrinkage and porosity of concrete was studied at a deep level. It was found that a large number of micropores of concrete were reduced by using 2% of rubber latex resulting in decrease in shrinkage significantly. By using rubber latex in concrete, a hazardous expensive chemical shrinkage-reducing admixture can be replaced by a low-cost nonhazardous organic substance.

中文翻译：

---

天然胶乳对地聚合物混凝土收缩行为和孔隙率的影响

减缩剂已被证明是减少混凝土表面收缩裂缝的最佳解决方案。当地市场上的各种减缩外加剂都是化学的、高度危险的，并且在混凝土中的使用有限。在目前的研究中，橡胶乳胶被用来代替地质聚合物混凝土中高达 2% 的水。测定了具有不同剂量橡胶胶乳的地质聚合物混凝土的体积收缩率，并将这些结果与相同混合物的传统水泥混凝土进行了比较。深入研究了混凝土体积收缩与孔隙率的关系。研究发现，使用2%的胶乳可以减少大量混凝土的微孔，从而显着降低收缩率。通过在混凝土中使用橡胶乳胶，