Abstract
Taking high ductility concrete (HDFC) as a research object, the frost resistance of HDFC in freeze-thaw cycle tests is studied, accurately predicted, and quantitatively described. Taking the relative dynamic elastic modulus as the evaluation index, the response surface model and GM (1,1) model were used to study the frost resistance of HDFC, and the advantages and disadvantages were evaluated. Design-Expert software was used to establish a response surface model to study the effects of polyvinyl alcohol fiber (PVA) length, polyvinyl alcohol fiber volume content, and number of freeze-thaw cycles on the frost resistance of HDFC, and a fitting relationship model between the relative dynamic elastic modulus and these three factors was established. The results show that the influence of PVA fiber content on the frost resistance durability of HDFC is higher than that of the PVA fiber length, but the effect of the external environment on the degree of deterioration for HDFC is greater than the improvement of the properties of the material itself; that is, the freeze-thaw cycling has a greater effect than the PVA fiber content and length. Grey system theory was introduced in the HDFC freezing resistance test, and the change rule for the relative elastic modulus and the average relative error for the GM (1,1) model for varying PVA fiber length and content was determined to be less than 5%. It is concluded that the freezing resistance prediction accuracy for HDFC based on the GM (1,1) model is higher than that of the response surface model. The GM (1,1) model can be used to accurately predict the degree of damage caused by freezing and melting cycles for HDFC.
Highlights
High ductility cement matrix composites are a new type of structural material with high toughness, high crack resistance, and high frost resistance. ese materials show strong crack resistance and strain hardening under tensile and shear loads and can greatly improve the brittleness of concrete and have good prospects for development [1,2,3,4,5,6]
A response surface model and GM (1,1) model were established to analyze and predict the frost resistance of HDFC with the number of freeze-thaw cycles, polyvinyl alcohol fiber (PVA) volume content, and PVA length as variables. e simulation accuracy and pros and cons of the two models are discussed to provide a theoretical basis and experimental basis for solving the practical problems faced by cold areas in the north
−Z(n1) 1 e HDFC relative dynamic elastic modulus prediction model of the GM (1,1) model can be obtained by solving the albinism differential equation
Summary
High ductility cement matrix composites are a new type of structural material with high toughness, high crack resistance, and high frost resistance. ese materials show strong crack resistance and strain hardening under tensile and shear loads and can greatly improve the brittleness of concrete and have good prospects for development [1,2,3,4,5,6]. Based on response surface analysis, Wu et al [14] concluded that freeze-thaw cycles and sulfate solution lead to the most significant damage to road concrete with high performance synthetic fiber in freeze-thaw cycle tests. Based on the GM (1, 1) model, Gao et al [16] established a frost resistance model of stress-damaged lightweight aggregate concrete under a special extreme environment and obtained high prediction accuracy. Yu et al [20] studied the freeze-thaw cycle splitting test to simulate the frost heave characteristics of permeable asphalt concrete and used the Gray-Markov model to evaluate the groundwater stability in seasonal freeze-thaw areas, which has high accuracy. A response surface model and GM (1,1) model were established to analyze and predict the frost resistance of HDFC with the number of freeze-thaw cycles, PVA volume content, and PVA length as variables. A response surface model and GM (1,1) model were established to analyze and predict the frost resistance of HDFC with the number of freeze-thaw cycles, PVA volume content, and PVA length as variables. e simulation accuracy and pros and cons of the two models are discussed to provide a theoretical basis and experimental basis for solving the practical problems faced by cold areas in the north
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
