Study on the preparation and performance of carbon fiber building energy-saving insulation mortar.

In order to obtain excellent insulation performance and high-strength energy-saving insulation mortar, a carbon fiber building energy-saving insulation mortar was prepared using ordinary Portland cement P.O 42.5 as the matrix material and adding an appropriate amount of carbon fiber as the reinforcing material in the mortar. The effect of carbon fiber doping on the mechanical properties, shrinkage rate, and insulation performance of insulation mortar was studied, and the relationship between thermal conductivity and apparent density of insulation mortar was established. The results showed that with the increase of carbon fiber doping amount, the apparent density of insulation mortar first decreased and then slightly increased, while the consistency, compressive strength, and flexural strength all increased and then decreased. At the age of 28 d, when the doping a-mount of carbon fiber was 0.5 wt%, the compactness of the network structure in the insulation mortar was the best, with the compressive strength and flexural strength reaching their maximum values of 46.1 and 6.8 MPa, respectively. Among them, the flexural strength had increased by 23.64%, and the improvement effect was higher than the compressive strength. As the amount of carbon fiber doping increased, the shrinkage rate of insulation mortar continues to decreased, and the thermal conductivity first decreased and then increased. When the doping amount of carbon fiber was 0.5 wt%, the thermal conductivity of the insulation mortar reached the lowest value of 0.0583 W/(m · K), indicating the best insulation performance. By fitting the thermal conductivity and apparent density of insulation mortar, it was found that they are linearly correlated, with a fitting degree of 98.4%. Overall, the optimal doping amount for carbon fibers is 0.5 wt%. [ABSTRACT FROM AUTHOR]