Malaiškienė Jurgita, Jakubovskis Ronaldas
Laboratory of Composite Materials, Institute of Building Materials, Faculty of Civil Engineering, Vilnius Gediminas Technical University, Sauletekio av. 11, 10223 Vilnius, Lithuania.
Laboratory of Innovative Building Structures, Faculty of Civil Engineering, Vilnius Gediminas Technical University, Sauletekio av. 11, 10223 Vilnius, Lithuania.
Materials (Basel). 2025 Mar 16;18(6):1304. doi: 10.3390/ma18061304.
The aim of this paper is to analyse the influence of the following different supplementary cementitious materials (SCMs): milled quartz sand, microsilica, waste metakaolin, milled window glass, and a binary additive made of one part waste metakaolin and one part microsilica, on the properties of ultra-high-performance concrete, and choose the best additive according to the physical, mechanical, and structural properties of concrete. In all mixes except the control mix, 10% of the cement was replaced with pozzolanic additives, and the changes in the physical, mechanical, and structural properties of the concrete were analysed (density, compressive strength, water absorption, capillary water absorption, degree of structural inhomogeneity, porosity, freeze-thaw resistance prediction coefficient Kf values); X-ray diffraction analysis (XRD) and scanning electron microscopy analysis (SEM) results were then interpreted. Concrete with microsilica and the binary additive (microsilica + metakaolin) was found to have the highest compressive strength, density, closed porosity, and structural homogeneity. Compared to the control sample, these compositions have 50% lower open porosity and 24% higher closed porosity, resulting from the effect of pozzolanic additives, with which the highest density and structural homogeneity was achieved due to the different particle sizes of the additives used.
本文旨在分析以下不同的辅助胶凝材料（SCMs）：磨细石英砂、微硅粉、偏高岭土废料、磨细窗玻璃以及由一份偏高岭土废料和一份微硅粉制成的二元添加剂，对超高性能混凝土性能的影响，并根据混凝土的物理、力学和结构性能选择最佳添加剂。在除对照混合料之外的所有混合料中，用火山灰添加剂替代10%的水泥，并分析混凝土物理、力学和结构性能的变化（密度、抗压强度、吸水率、毛细吸水率、结构不均匀度、孔隙率、抗冻性预测系数Kf值）；然后解读X射线衍射分析（XRD）和扫描电子显微镜分析（SEM）结果。发现含有微硅粉和二元添加剂（微硅粉+偏高岭土）的混凝土具有最高的抗压强度、密度、闭孔孔隙率和结构均匀性。与对照样品相比，由于火山灰添加剂的作用，这些组合物的开孔孔隙率降低了50%，闭孔孔隙率提高了24%，由于所用添加剂的粒径不同，实现了最高的密度和结构均匀性。
