Т. 59. Бр. 1. Международна научна конференция " Съвременни тенденции и иновации в строителството ", 09 - 10 октомври 2025 г.
Рез. на англ. ез.
DOI: 10.71167/uaceg.2026.590118
Анотация
" Concrete is the most used building material in the world, with production increasing year on year. It plays a significant role in modern construction due to its versatility in shaping, durability, and cost-effectiveness. However, the production of cement used for concrete is highly polluting due to the large amount of carbon dioxide emitted into the atmosphere. The aim is therefore to use sustainable concrete, for which the cement used is supplemented with a certain amount of additives or substitutes to reduce the clinker content. One such additive is the natural local puzzolana - opoka. Such concrete with opoka cement has the property of having higher shrinkage deformations at an early age, leading to cracks and fissures. To overcome this problem, chemical admixtures or other additives are used in concrete production to reduce the shrinkage of the concrete. The aim of the research is to investigate the effect of concretes with different binders (control CEM I 42,5 R, CEM II/A-P 52,5N, CEM II/B-M (P-LL) 42,5N, CEM II/A-LL 42,5 R) on the properties of fresh and hardened concrete. The focus is on the study of early and drying concrete shrinkage. After performing a shrinkage test, it was found that early shrinkage (till 1 day) concretes with CEM II/B-M(P-LL) 42,5N and CEM II/A-P 52,5N type binders reached more shrinkage than the control concrete, respectively. Also, within the first 24 hours after casting the samples, it was observed that both samples with pozzolans in their binder composition after approximately 6 hours have a shrinkage curve jump, i.e. a sudden increase in shrinkage. This happens probably due to natural puzzolana porosity which after some period released free water. After 14 days of hardening, it was found that concretes with CEM II/B-M (P-LL) 42,5N and CEM II/A-P 52,5N type binders reached 34 % and 5 % more shrinkage than the control concrete, respectively."
Grinys, A., Augonis, A., Ivanauskas, E., Urbonaite, D. Shrinkage investigation of sustainable concrete with different binders. София: УАСГ, 2026 с. 235 - 246,.
Grinys, A., Augonis, A., Ivanauskas, E., Urbonaite, D. Shrinkage investigation of sustainable concrete with different binders. София: УАСГ, 2026 с. 235 - 246,.
Grinys, A., Augonis, A., Ivanauskas, E., Urbonaite, D. (2026) Shrinkage investigation of sustainable concrete with different binders, София: УАСГ с. 235 - 246,.
Grinys, A., Augonis, A., Ivanauskas, E., & Urbonaite, D. (2026). Shrinkage investigation of sustainable concrete with different binders. София: УАСГ, с. 235 - 246.
Grinys A, Augonis A, Ivanauskas E, Urbonaite D. Shrinkage investigation of sustainable concrete with different binders. София: УАСГ; 2026. p. с. 235 - 246.
