A fundamental difference between the grain size composition of cement-free refractory concretes (CFRC) from low- and ultra-low-cement concretes is presence within their composition of up to 2 – 3 % nanoparticles (<0.1 μm) that determine increased reactivity. During selection of the optimum CFRC grain size composition in order to achieve the densest particle packing there is often use of “ideal curves” in accordance with Andreasen and Furnas equations. The specific nature of the use of porous fillers in the production of CFRC is considered. The strength of ceramic concrete with porous aggregates significantly exceeds the strength of the aggregates themselves.

无水泥耐火混凝土 (CFRC) 与低水泥和超低水泥混凝土的粒度组成之间的根本区别在于，它们的组成中存在高达 2 – 3 % 的纳米颗粒 (<0.1 μm)，这决定了增加的反应性。在选择最佳 CFRC 粒度组成以实现最致密的颗粒堆积时，通常会使用符合 Andreasen 和 Furnas 方程的“理想曲线”。考虑了在 CFRC 生产中使用多孔填料的特殊性质。具有多孔骨料的陶瓷混凝土的强度明显超过骨料本身的强度。