矿渣—粉煤灰基高性能混凝土专用胶凝材料

Slag-fly ash based cementitious materials special for high performance concrete

通过优化配比组分、粒级设计和使用外加剂,制备出一种高掺量矿渣、粉煤灰且使用水泥熟料较少的矿渣--粉煤灰基高性能混凝土专用胶凝材料.研究了物料粉磨方式、石膏掺量、矿渣与粉煤灰的掺量及比例对复合高性能胶凝材料体系强度的影响,并通过X射线衍射(XRD)和扫描电镜(SEM)微观分析手段观察其微观结构和水化产物,阐明了复合胶凝材料活性与级配协同优化效应.复合胶凝材料胶砂水胶比为0.36时具有较好的流动度,胶砂试块养护28d抗压强度可以达到58.9MPa,抗折强度达到14.2MPa,并具有良好的抗硫酸盐侵蚀性能,配制的混凝土具有良好的抗碳化性能.

Cementitious materials special for high performance concrete with high volume of fly ash and slag and less cement clinker were prepared by optimizing the proportion of ingredients and the size fraction and using an additive. The effects of grinding modes, gypsum amount and the mix proportion of slag to fly ash on the strength of the cementitious materials were studied. X-ray diffraction analysis （XRD） and scanning electron microscopy （SEM） were used to observe the microstructure and hydration products and investigate the collaborative optimization effect between the activity and grading of the cementitious materials. The results show that cementitious materials have good mortar fluidity when the water-binder ratio （W/C） is 0.36, the compressive strength of colloidal mortar specimens cured for 28d is 58.9 MPa and the 28d flexural strength is 14.2 MPa, which have favorable properties of erosion resistance to sulfates. The concrete made from the cementitious materials has a better ability of carbonation resistance.