Developing Environmentally Sustainable and Cost-Effective Geopolymer Concrete with Improved Characteristics

Sustainability

Sergey A. Stel’makh¹  Evgenii M. Shcherban’¹  Besarion Meskhi²  Levon R. Mailyan³  Diana El’shaeva⁴  Alexey N. Beskopylny⁵  Valery Varavka⁶ 

[1] Department of Engineering Geology, Bases, and Foundations, Don State Technical University, 344000 Rostov-on-Don, Russia;Department of Life Safety and Environmental Protection, Faculty of Life Safety and Environmental Engineering, Don State Technical University, Gagarin, 1, 344000 Rostov-on-Don, Russia;Department of Roads, Don State Technical University, 344000 Rostov-on-Don, Russia;Department of Technological Engineering and Expertise in the Construction Industry, Don State Technical University, 344000 Rostov-on-Don, Russia;Department of Transport Systems, Faculty of Roads and Transport Systems, Don State Technical University, Gagarin, 1, 344003 Rostov-on-Don, Russia;Research and Education Center “Materials”, Don State Technical University, Gagarin sq., 1, 344003 Rostov-on-Don, Russia;

关键词: geopolymer concrete;    compressive strength;    tensile strength;    optimal composition;    temperature treatment;    sodium silicate;   

DOI  :  10.3390/su132413607

来源: DOAJ

【 摘 要 】

Improving the efficiency and quality of construction mainly depends on the cost of building materials, which is about 55–65% of total capital-construction costs. The study aimed to obtain geopolymer fine-grained concrete with improved quality characteristics that meet the construction field’s sustainable development criteria and that have environmental friendliness, economic efficiency, and advantages over competing analogues. The dependences of strength characteristics on various compositions of geopolymer concrete were obtained. It was found that the most effective activator is a composition of NaOH and Na₂SiO₃ with a ratio of 1:2. The increase in the indicators of the obtained geopolymer concrete from the developed composition (4A) in relation to the base control (1X) was 17% in terms of compressive strength and 24% in tensile strength in bending. Polynomial equations were obtained showing the dependence of the change in the strength characteristics of geopolymer concrete on the individual influence of each of the activators. A significant effect of the composition of the alkaline activator on the strength characteristics of geopolymer fine-grained concrete was noted. The optimal temperature range of heat treatment of geopolymer concrete samples, contributing to the positive kinetics of compressive strength gain at the age of 28 days, was determined. The main technological and recipe parameters for obtaining geopolymers with the desired properties, which meet the ecology requirements and are efficient from the point of view of economics, were determined.

【 授权许可】

Unknown