Novel low emissions supersulfated cements based on volcanic pumice were evaluated in reinforced concretes; the mechanical, microstructural and electrochemical properties were studied for 180 days. The volcanic pumice was chemically activated with anhydrite or hemihydrate and an alkaline activator of quicklime and Portland cement. The binder consumption in the concretes was of 720 kg/m³, of which only 72-144 kg/m³ were of Portland cement; a reference concrete based on the latter was also prepared with 415 kg/m³. The specimens were cured at 25°C or for 22h at 60°C then at 25°C; these were exposed to laboratory conditions or to immersion in 3.5%NaCl at 25°C to induce accelerated corrosion. Compared to the reference concrete, the supersulfated cement based concretes had 65-82% less Portland cement and at least 49% lower CO₂ emissions, were up to 26% cheaper and showed similar 28-day and better 180-day compressive strength, reaching up to 44 MPa. Compared to green concretes from the literature, similar or better strengths and up to 24% less CO₂ emissions were noted. The penetration of chlorides and electrochemical tests showed that the activation with 10%CaO promoted adequate protection to the embedded steel, in some instances better than the reference concrete. The novel supersulfated cements appear to be a promising alternative to produce sustainable and durable concretes for regions on the world with access to volcanic materials.

在钢筋混凝土中评估了基于火山浮石的新型低排放超硫酸盐水泥。进行了180天的力学，微观结构和电化学性能研究。火山浮石被硬石膏或半水合物以及生石灰和硅酸盐水泥的碱性活化剂化学活化。混凝土中的粘合剂消耗量为720 kg / m ³，其中仅波特兰水泥为72-144 kg / m ³。还制备了基于后者的参考混凝土，重量为415 kg / m ³。将样品在25°C或60°C下固化22h，然后在25°C固化；将它们暴露在实验室条件下或在25°C的3.5％NaCl中浸泡以加速腐蚀。与参考混凝土相比，超硫酸盐水泥基混凝土的硅酸盐水泥减少65-82％，CO ₂排放量至少降低49％，便宜26％，并具有相似的28天和180天更好的抗压强度，达到高达44 MPa。与文献中的绿色混凝土相比，强度相近或更高，且CO ₂减少多达24％注意排放。氯化物的渗透和电化学测试表明，用10％CaO活化对嵌入的钢具有足够的保护作用，在某些情况下比参考混凝土更好。新型的超硫酸盐水泥似乎是一种有前途的替代方法，可以为世界上使用火山材料的地区生产可持续，耐用的混凝土。