Shcherban' Evgenii M, Stel'makh Sergey A, Beskopylny Alexey, Mailyan Levon R, Meskhi Besarion, Shuyskiy Anatoly, Beskopylny Nikita, Dotsenko Natal'ya
Department of Engineering Geology, Bases and Foundations, Don State Technical University, 344003 Rostov-on-Don, Russia.
Department of Transport Systems, Don State Technical University, 344003 Rostov-on-Don, Russia.
Materials (Basel). 2022 Apr 3;15(7):2642. doi: 10.3390/ma15072642.
The widespread use of aerated concrete in construction has led to the emergence of many types and compositions. However, additional research should fill theoretical gaps in the phenomenon of gas release during the formation of the structure of aerated concrete. Based on theoretical analysis and experimental studies, the article proposes a mathematical model of the swelling process based on the physicochemical laws of convection and molecular diffusion of hydrogen from a mixture and the conditions of swelling, precipitation, and stabilization of the mixture. An improved method for the manufacture of aerated concrete is proposed, which consists of introducing cement pre-hydrated for 20-30 min into the composition of the aerated concrete mixture and providing improved gas-holding capacity and increased swelling of the mixture, reducing the average density of aerated concrete up to 29% and improving heat-shielding properties up to 31%. At the same time, the small dynamics of a decrease in the strength properties of aerated concrete were observed, which is confirmed by an increased structural quality factor (CSQ) of up to 13%. As a result, aerated concrete has been obtained that meets the requirements of environmental friendliness and has improved mechanical and physical characteristics. Economic efficiency is to reduce the cost of production of aerated concrete and construction in general by about 15%.
加气混凝土在建筑中的广泛应用导致了多种类型和成分的出现。然而，更多的研究应填补加气混凝土结构形成过程中气体释放现象的理论空白。基于理论分析和实验研究，本文提出了一个基于氢气从混合物中对流和分子扩散的物理化学规律以及混合物膨胀、沉淀和稳定条件的膨胀过程数学模型。提出了一种改进的加气混凝土制造方法，即在加气混凝土混合物的组成中引入预水化20 - 30分钟的水泥，从而提高混合物的储气能力和膨胀率，将加气混凝土的平均密度降低至29%，隔热性能提高至31%。同时，观察到加气混凝土强度性能下降的动态较小，结构质量系数（CSQ）提高至13%证实了这一点。结果，获得了符合环保要求且机械和物理特性得到改善的加气混凝土。经济效益是使加气混凝土的生产成本以及总体建筑成本降低约15%。
