In order to clarify the effect and influence mechanism of polymers on the waterproof performance of cement mortar, the effects of three polymers on capillary water absorption, impermeability, porosity and cracking of cement mortar were studied. The correlation between porosity and waterproof performance was analysed and the waterproofing mechanism of polymer-modified mortar was explored. The results show that waterproof performance, characterised by capillary water absorption and impermeability, was significantly improved by all three polymers but to different extents. The cracking weighted value declined and open porosity decreased with an increase in polymer dosage. The penetration depth of water into mortar and the capillary water absorption showed linear and exponential growth, respectively, with an increase in open porosity. The polymers were found to improve pore structure and refine porosity of >50 nm and thus weaken the negative effect of porosity on the waterproof performance of mortar.
In the paper, the method of deicing and melting snow by the carbon fiber heating wire (CFHW) embedded in the airport asphalt pavement is proposed to improve the security of airport operation. The field experiment of deicing and melting snow on the airport asphalt pavement is conducted. Deicing and melting snow, asphalt pavement temperature, ice-free area ratio, and snow-free area ratio are analyzed. Electrical power with 350 W/m2 is input to the airport asphalt pavement for deicing and melting snow by the CFHW. In the experiment, 3 mm ice can be melted, and the average infrared ray temperature (IRT) of the airport asphalt pavement surface can achieve an increment of 13.0°C in 2.5 hours when the air temperature is from −7.5°C to −2.2°C. Snow with 3.2 mm precipitation can be melted in 2 hours when the air temperature is from −4.8°C to −3.5°C, and the asphalt pavement temperature can achieve an increment of 5.9°C at the depth of 0.5 cm. The results show that the method of deicing and melting snow on the airport asphalt pavement by the CFHW is practicable in the cold zone.
In this paper, the method of melting snow with carbon fiber heating wire (CFHW) buried in concrete pavement is presented to avoid the adverse effects of snow-melting chemicals. The pavement temperature, heating rate and temperature difference are analyzed. It is shown that, with an input power of 500W/m 2 , the average temperature on pavement surface with 10cm CFHW spacing is higher than that of 15cm CFHW spacing when the air temperature is-5C and the wind speed is 1.0m/s. The temperature different on pavement surface with 10cm CFHW spacing can meet the requirement of the snow-melting temperature uniformity.
Maintenance is an important means to ensure the quality of airport pavement concrete and an indispensable key link in the construction process of the airport pavement. This article through engineering example of airport pavement construction contrasts the economy of most commonly used geotextile maintenance with that of more advanced curing membrane maintenance technology throughout the conservation period. The results show that the labor and water cost of curing membrane maintaining airport pavement concrete comparing with geotextile maintaining airport pavement concrete are greatly reduced, and the total cost of maintenance saves about 1/3, which has a very significant economic value.
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