Abstract
The matters of investigation for water thermal regime of pavement and subgrade structures of the highways are especially important as the moisture and temperature distribution in pavement and subgrade layers impact greatly on their deformation and strength indicators. Experimental results, which can be obtained by special measurement devices, are primary ones for establishing of peculiarities and regularities for distribution and migration of heat and moisture in the mentioned structural elements of the highways. Special measurement devices are required to obtain such experimental data. The paper shows the results for analysis of temperature and moisture variation in points of pavement and subgrade of “Almaty-Bishkek” highway. Temperature measurement has been performed by set of special sensors. Regular temperature and moisture measurement have been performed for the period from September 18, 2015 to June 2, 2016. Regularities for temperature regime variation in points of pavement for 24 hours are coordinated with air temperature variations. Amplitude of vibration for temperature is decreased with the depth increase. Moisture in subgrade points is gradually decreased with the reduction of daily average air temperature.
Highlights
IntroductionCondition and service life of highways is affected by mechanical forces, such as load from moving vehicles, and natural climatic factors, among which temperature and moisture are of specific importance
Condition and service life of highways is affected by mechanical forces, such as load from moving vehicles, and natural climatic factors, among which temperature and moisture are of specific importance.In Kazakhstan first research of water thermal regime for subgrade and pavements was started approximately in 60s-70s of the previous century
Period for subgrade soil frosting is about 2 weeks; the frosting depth is 118 cm; 2) Solar radiation has a great impact on formation of temperature field in road structure of the region
Summary
Condition and service life of highways is affected by mechanical forces, such as load from moving vehicles, and natural climatic factors, among which temperature and moisture are of specific importance. In the beginning of 1990s the works were started for the research of temperature regime, first for asphalt concrete pavements, and for other structural layers of pavement and subgrade with the use of special designed sensors of transistor [1, 2] and thermal resistance [3]. Temperature measurement is performed according to the principle of thermal resistance variation, and moisture measurement – according to principle of dielectric permeability. Such combines structure of sensors allows obtaining of information for temperature and moisture in points of road structure simultaneously. The sensors work in automatic regime, they carry out temperature and moisture measurement in each hours and the obtained information is recorded into memory block. This paper represents some results of experimental study for temperature and moisture distribution in pavement and subgrade of “Almaty-Bishkek” highway, related to the period of time from 18 September 2015 to 2 June 2016
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