Abstract: The drainage function of concrete pavement brick pavement is affected by many factors, such as pavement slope and water seepage function. Focusing on the seepage function of the concrete pavement brick pavement, it is assumed that it is only related to the gap ratio of the pavement and the gap infiltration ability, and the influence of the application age on the seepage function of the pavement is analyzed through actual measurement. The water permeability of 14 concrete pavement bricks with different ages in a certain area was tested. The shortest age was the newly paved road and the longest was 25 years. The results show that the longer the age of use, the worse the water permeability of the pavement, and it decreases almost exponentially with the age of use. At the same time, an in-depth analysis of this phenomenon is also found. The more particulate matter, this is the main reason for the water leakage in the gap to decrease. It was also found in the experiment that vegetation has an important effect on maintaining soil looseness and enhancing soil water seepage function.
With the development of social modernization, roads and other infrastructure are becoming increasingly important to the people's lives. Concrete pavement brick pavement is a water-permeable pavement. Because it has the characteristics of strong water permeability related to traditional asphalt pavement, it can reduce the surface runoff, reduce the peak depth of runoff, and delay the peak presentation time. Therefore, with regard to the low load capacity and low-speed walking requirements, the concrete pavement floor (CBP) is favored by road engineers. Therefore, it is necessary to carry out specific and comprehensive research on the functions of the concrete pavement floor.
The concrete pavement floor has a certain ability to penetrate the surface water flow, and this ability is related to a variety of factors and has been paid close attention by scientists [1-3]. Investigations have shown that the infiltration on the concrete pavement floor can decrease with the increase of the age of use, and under certain conditions, the pavement can be completely lost. Because this phenomenon will cause road area water and cause different degrees of damage to roadbed and other infrastructure, it has always been paid close attention by construction personnel.
However, most of the domestic and foreign literatures focus on different pavements, and study the influence of surface runoff and rainfall on pavement seepage ability [4-8]. Little attention is paid to the use of age and pavement gap ratio (ratio of pavement gap area to overall area) to seepage function Impact. This paper has carried out experimental investigations on the seepage function of concrete pavement brick pavements. The model is simplified and it is assumed that the pavement seepage can only be related to two parameters, namely the gap ratio of the pavement and the seepage ability of the gap. Influence of soaking ability.
1 scheme design
This article needs to complete two intents: first, to measure the ability of concrete pavement bricks to seep through different ages; second, to conduct an in-depth analysis of the impact of age on the pavement seepage function.
Regarding the first policy of the list, in order to minimize the impact of disturbance factors, the principle of demand must be in the test:
a) In order to study the relationship between pavement water permeability and the age of use and the gap ratio, together with less disturbance from other factors, the test selects concrete pavement bricks with uniform length, width, and similar texture;
b) In order to reduce the penetration of the brick surface and enhance the correlation between the water seepage of the gap and the test results, it is necessary to select a concrete pavement with a weak permeability and a solid pavement, and a moderate gap ratio to avoid the gap ratio being too small Increased the proportion of other disturbance factors;
c) In order to reduce the influence of different water pressures, all tests use the same water pressure (400 mm water column), and the water penetration is measured every 15 minutes;
d) In order to analyze the relationship between the pavement permeability of concrete pavement bricks and the age of use, it is necessary to select test targets with different durations of use;
e) In order to reduce the influence of the slope on the ground and the protrusion of the pit, the flat surface should be selected for testing as much as possible.
In order to understand the impact of age on the pavement seepage function, a detailed classification of the fillings between pavement gaps is required. Because the particle diameter has a direct effect on the soil water seepage function , it is necessary to classify the fillers between the gaps according to the particle diameter and saturate the various fillers to perform quantitative analysis.
In summary, the test should complete the maximum correlation between test results and model parameters, and reduce the disturbance of non-model parameters together.
2 test equipment
In order to complete the design plan, certain equipment is required to complete the data collection and error control. For the test, a cylindrical container with a diameter of 280 mm and a height of 150 mm was used. The bottom was open and the center of the top had a circular hole with a diameter of 50 mm. The round hole is connected to a glass container with a diameter of 50 mm and a height of 300 mm at both ends, and the connection is filled with a flexible material to avoid water leakage. As shown in Figure 1, the container was covered at the circumference shown in Figure 2 during the test. The gray part in the picture is the existing water amount, the height is 400 mm, and it is stable during the test. This height is to ensure that the water has a stable and sufficient osmotic pressure on the ground, and then relatively weakens the impact of other parameters.