One-part blended cements with 65% limestone and 35% Portland cement (PC) were activated by 3–8%wt. of four powdered sodium silicates of different modulus SiO₂/Na₂O = 1–3.26. Pastes were cured at 20 °C for 180 days in dry and underwater conditions. The use of moduli <3.26 promoted quick setting and low strength of the pastes. The use of modulus = 3.26 showed the best results in terms of workability, underwater stability and compressive strength higher than a reference non-activated blend; the evolution of pH, rate of heat liberation and setting times were similar among the activated and non-activated blend, indicating that the hydration of PC was not strongly altered by the activator and that other favorable reactions took place. Microstructural characterization showed that the developed strength was favored by reactions of the sodium silicate with portlandite from the Portland cement and limestone, as well as by the condensation of C–S–H and silica gel.

含有65％石灰石和35％波特兰水泥（PC）的单份混合水泥以3–8％的重量活化。模量为SiO ₂ / Na ₂的四种粉状硅酸钠O = 1-3.26。糊状物在干燥和水下条件下于20°C固化180天。模量＜3.26的使用促进了糊的快速凝固和低强度。使用模量= 3.26时，在可加工性，水下稳定性和抗压强度方面均比参考非活化共混物要好；在活化和未活化的混合物中，pH的变化，放热速率和凝固时间相似，这表明活化剂并未强烈改变PC的水合，并且发生了其他有利的反应。显微组织表征表明，硅酸钠与硅酸盐水泥和石灰石中的硅酸盐反应，以及C–H–H和硅胶的缩合，有助于提高强度。