Mechanical Properties of Green Ultra-High Toughness Fiber Concrete

Abstract:

The green transformation of concrete is of great importance for China to achieve the dual carbon development goal， this paper， combining the principle of compact stacking with multi-level grain size of matrix components and using high dosing industrial waste ultra-fine fly ash as an important component， successfully develops a new low carbon ultrahigh toughness concrete （LC-UHTC）. The results show that the ultimate tensile strain of LC-UHTC reached 6.38 %， the tensile strength reaches 10.20 MPa， and the tensile strength increases by more than 60 % compared with other similar materials. The tensile strength and strain energy of LC-UHTC are excellent at all stages of strain， indicating that LC-UHTC has a higher safety performance in practical application. The compressive strength of LC-UHTC reaches 84.35 MPa， which is 30 %–86 % higher than that of other similar materials. LC-UHTC shows comprehensive performance advantages in environmental protection， tension， toughness and compression， which can provide reference value for the green transformation of new concrete.

Key words:fiber reinforced concrete;green ultra-high toughness;strain hardening;dual carbon goals;green transition