新型低碳超高韧性纤维混凝土研制与力学特性研究

Mechanical Properties of Green Ultra-High Toughness Fiber Concrete

摘要:

混凝土的绿色转型对国家实现双碳发展目标具有重要意义，结合紧密堆积原理多级划分基体组分，采用高掺量工业废料超细粉煤灰作为低碳节能新型混凝土的重要组成部分，成功研制新型低碳超高韧性混凝土（LC-UHTC）。研究结果表明：LC-UHTC极限拉伸应变达6.38 %，拉伸强度达到10.2 MPa，拉伸强度较其他同类材料增比达60 %以上；LC-UHTC拉伸强度、拉伸韧性在应变各个阶段均表现优异，在实际应用过程中具有更高的安全性能；LC-UHTC的抗压强度达到84.35 MPa，高于其他同类材料30 %~86 %；LC-UHTC在环保、抗拉、增韧、抗压方面表现出了综合的性能优势，可为新型混凝土的绿色转型提供参考价值。

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.