The low temperature in winter, especially at night, often drops to more than ten degrees below zero, which brings great difficulties to the construction of pervious concrete. The construction temperature of pervious concrete is usually between 15℃ and 25℃, high temperature in summer and low temperature in winter are not conducive to its construction. However, in some cases, construction of pervious concrete in winter is unavoidable. Therefore, how to ensure the quality of pervious concrete construction in winter has become an urgent problem to be solved in the field of road construction.

For the construction of pervious concrete in winter, the following suggestions are crucial:

First of all, the ratio of materials must strictly comply with the standards. Pervious concrete is composed of reinforcing agent, aggregate and powder, which directly affects the strength and durability of the pavement. In winter construction, it is necessary to adjust the proportion of additives according to the site climate and temperature to shorten the curing time of the permeable layer and improve the frost resistance of the pavement.

Secondly, the construction process and maintenance after construction are equally important. In winter, the permeable layer solidification is slow. It is recommended to avoid personnel moving within 3 days after the completion of construction. In order to ensure the quality of the road surface, personnel can be arranged to watch the scene or set up no-go tips to prevent damage to the road surface.

Moreover, covering protection is one of the key measures for pervious concrete construction in winter. After the construction is completed, the construction road should be covered with plastic film immediately, and the edge part is covered more than 20 cm to ensure that it is tight. To enhance the insulation effect, a layer of geotextile can be covered on the plastic film to prevent heat loss and ice on the concrete surface.

In addition, special attention should be paid to the drainage problem in the case of water-stable foundation or cement pavement. Freezing in winter can cause rainwater to be unable to drain effectively, which can lead to the phenomenon of empty drums. To this end, graded gravel can be laid at the bottom, so that rainwater can penetrate into the soil to avoid the occurrence of empty drum phenomenon.

If the temperature is lower than 5 ° C throughout the day, it is not suitable for large-area pervious concrete construction. At this time, we should wait for the weather to warm up before laying to ensure the quality of construction.

Finally, in view of the problem of unsolid backfill pavement, the pavement must be tamped before construction, and the tamping degree should reach more than 93%. After tamping, graded gravel and permeable layers are laid to improve the stability and durability of the pavement.

In conclusion, although the construction of pervious concrete in winter faces many challenges, the construction quality can be effectively improved and the durability and environmental protection performance of pervious concrete pavement can be ensured by strict adherence to material ratio, paying attention to construction maintenance, strengthening coverage protection, optimizing drainage design, reasonable control of construction time, and tamping the pavement foundation. In the future, with the continuous progress and innovation of technology, the problem of permeable concrete construction in winter will be further solved, providing a more efficient and environmentally friendly solution for urban road construction.