The present article discusses the influence of two types of polymeric admixture on the stress–strain \((\sigma - \varepsilon )\) behavior, elastic modulus, and toughness of cement-based cementitious material. Cement properties modified with two types of polymeric admixture up to 0.06% (% wt.) were tested. Adding polymers improved the flowability of cement by 7 to 26%, but it decreased the water/cement ratio \((w/c)\) by 12 to 43%, depending on the polymeric structure and its content. The nonlinear Vipulanandan p-q equation was tested to predict the \(\sigma - \varepsilon\) relationship of the modified cement with polymers and was compared with the \(\beta\) model. The compression strength of cement increased by 107 to 257% when 0.06% of polymers were added to the cement. Modifying the cement with polymeric admixtures enhances the initial elastic modulus (Ei) of cement by 23 to 240% according to polymeric admixture types, curing age (t), \(w/c\), and polymeric admixture percent. Adding polymeric admixture creates an amorphous gel that fills the spaces between cement particles with working fibers net or meshes covering the cement particles, which cause a reduction in the voids, porosity, and increasing the density of the cement, subsequently the mechanical properties significantly increased.

本文讨论了两种聚合物外加剂对水泥基胶凝材料的应力应变\((\sigma - \varepsilon )\)行为、弹性模量和韧性的影响。测试了用两种类型的聚合物混合物改性的水泥性能，最高可达 0.06% (% wt.)。添加聚合物使水泥的流动性提高了 7% 到 26%，但它使水/水泥比\((w/c)\)降低了 12% 到 43%，具体取决于聚合物结构及其含量。测试非线性 Vipulanandan pq 方程以预测改性水泥与聚合物的\(\sigma - \varepsilon\)关系，并与\(\beta\)模型。当水泥中加入0.06%的聚合物时，水泥的抗压强度提高了107%～257%。根据聚合物外加剂类型、固化年龄 (t)、\(w/c\)和聚合物外加剂百分比，使用聚合物外加剂改性水泥可将水泥的初始弹性模量 (Ei) 提高 23% 至 240% 。添加聚合物外加剂产生无定形凝胶，填充水泥颗粒之间的空间，工作纤维网或网覆盖水泥颗粒，这会导致水泥颗粒的空隙率和孔隙率减少，并增加水泥的密度，随后机械性能显着提高。