Материал: Scientific Herald of the Voronezh State University of Architecture and Civil Engineering
Issue № 1(29), 2016
Temperature of the mix, ºС
Time, min
ISSN 2075-0811
Thickness of a layer 0,03 m
Thickness of a layer 0,05 m
Thickness of a layer 0,08 m
Thickness of a layer 0,1 m
Fig. 6. Distribu tion of the mix temperature in the depen dence on the thickness of a surfacing la er
The ab ve data su ggests that depending on the thic ness of a surfacing layer, the distribution of the t emperature varies. With the thick ness of a layer 0,03 m the cooling rate of the hot mix is faster, which is due to little heat per a surface unit. The heat ransfer is at its peak f ollowing the laying within 5 to 10 min utes (a non stationary heat mode). As the thickness of a layer in the asp halt concrete mix incr eases, there are identic al processe s but due to growing amounts
of heat per a mat rial unit |
they are m ore smooth and can be 10—20 inutes long. Table |
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8 identifies the regression equations describing the distribution of temperature in time. |
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Table 8 |
Dependence for identifyin g the temper ture of the ho t mix in time |
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Thicknes s of a layer, m |
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Regression equations |
Correlation coefficient |
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0,03 |
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tсм = -30,2lnτ + 156,3 |
0,9 9 |
0,05 |
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tсм = 151,3е – 0,01τ |
0,9 9 |
0,08 |
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tс м = 153,7е – 0 ,009τ |
0,9 9 |
0,1 |
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tс м = 151,5е – 0 ,007τ |
0,9 7 |
The nu merical val ues of the temperature of the hot asphalt con crete mix |
n time is presented |
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in Tabl e 9. |
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Table 9 |
Distribution of the temperature of the hot mix in time in different thicknesse |
of a layer |
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Time, |
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Thic kness of a layer, m |
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min |
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0 |
5 |
10 |
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20 |
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30 |
40 |
50 |
60 |
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0,03 |
160 |
108 |
85 |
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62 |
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51 |
45 |
40 |
37 |
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0,05 |
160 |
144 |
131 |
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107 |
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90 |
78 |
70 |
63 |
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0,08 |
160 |
146 |
139 |
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126 |
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116 |
10 6 |
97 |
90 |
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0,10 |
160 |
146 |
139 |
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129 |
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121 |
11 3 |
107 |
100 |
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Scientific Herald of t he Voronezh State University o f Architecture and Civil Engineering. Construction and Architecture
In orde |
to identify the general law of the |
effect of the thickness of a hot m ix layer on the dis- |
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tribution of the te |
perature i |
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time, let |
s present the data in |
able 9 in relative units (Table |
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10). Let |
us denote the thickness of a surf cing layer Кн. |
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Table 10 |
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Distribution of the temperature of the hot mix in time in different thicknesse |
of a layer |
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(in relative units) |
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Thick ness of a lay r, m |
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Time, min |
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0 |
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0,58 |
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0,03 |
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1 |
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0,75 |
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0,65 |
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0,57 |
0,5 7 |
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0,57 |
0,58 |
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1 |
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0,05 |
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1,18 |
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0,08 |
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1,01 |
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1,06 |
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1,29 |
1,3 6 |
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1,38 |
1,42 |
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1,21 |
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0,10 |
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1,01 |
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1,06 |
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1,34 |
1,4 5 |
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1,53 |
1,59 |
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Taking into accou |
t the temp erature of t he mix in t |
e thicknes s of a layer 0,05 m per unit, let |
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us ident ify the dependence of the effect o f the thick ness of a surfacing layer on the co oling of the hot asphalt concrete mix ( Fig. 7).
Coefficient КH
Thick ess of a surfacing layer, m
Fig. 7. Dependence КH on the thick ess of a surfa cing layer
The nu merical val ue of the coefficient of the effect of the thickness of a s rfacing layer Кн на on the d istribution of the temp erature in the hot asphalt concret mix is given by
Kh 195h2 |
33,88h 0,224, |
(6) |
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where h is the thic kness of a surfacing la yer; the cor relation coefficient is 0 ,99. |
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Generally the temperat re of the h ot asphalt concrete mix is deter mined using |
the ex- |
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pressio n |
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160K |
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см |
K |
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K |
e 0,019 . |
(7) |
см |
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Issue № 1(29), 2016 |
ISSN 2075-0811 |
Conclusions
1.According to the results of mathematical modeling of thermal processes in a non-rigid roadway surfacing layer, the factors contributing to the cooling rates of hot mixes were identified.
2.The effect of the thickness of a layer, air temperature, wind speed, temperature of the mix during laying on technological processes in paving non-rigid roadways.
3.An analytical dependence for the calculation of the temperature of the hot mix in time considering cooling rates, weather conditions, construction parameters of surfacing.
4.The obtained dependence in the calculation of the temperature of the hot mix considering a combination of different factors give insight into the effect of the temperature of the hot mix on technological processes of non-rigid roadway construction.
5.The use of this dependence allows high accuracy in determining the temperature of the mix at a certain point in paving considering weather and construction parameters of a roadway surfacing. Overall this facilitates laying and compaction of hot asphalt mixes from the temperature perspective.
References
1.Zubkov, A. F. Texnologiya ustrojstva dorozhnyx pokrytij s uchetom temperaturnyx rezhimov asfal'tobetonnyx smesej / A. F. Zubkov. — Tambov: Izd-vo Pershina R. V., 2006. — 151 s.
2.Texnologiya i organizaciya stroitel'stva avtomobil'nyx dorog: v 2 t. T. 2. Dorozhnye pokrytiya / V. P. Podol'skij [i dr.]; pod red. V. P. Podol'skogo. — M.: Akademiya, 2012. — 297 s.
3.Zubkov, A. F. Rekomendacii po razrabotke texnologicheskix processov stroitel'stva pokrytij iz goryachix asfal'tobetonnyx smesej / A. F. Zubkov, K. A. Andrianov // Ustojchivoe razvitie gorodov i novacii zhilishhno-kommunal'nogo kompleksa: sb. st. po materialam 5-oj Mezhdunar. nauch.-prakt. konf. — M., 2007. — S. 132—137.
4.Zubkov, A. F. Texnologiya stroitel'stva asfal'tobetonnyx pokrytij avtomobil'nyx dorog / A. F. Zubkov, V. G. Odnol'ko. — M.: Mashinostroenie, 2009. — 223 s.
5.Dorozhnyj asfal'tobeton / L. B. Gezencvej [i dr.]; pod red. L. B. Gezencveya. — M.: Transport, 1985. — 32 s.
6.SNiP 3.03.06-85. Avtomobil'nye dorogi. — Vved. 01-01-1986. — M.: Gosstroj SSSr, 1986. — 111 s.
7.GOST 9128-2009. Smesi asfal'tobetonnye dorozhnye, ae'rodromnye i asfal'tobeton. Texnicheskie usloviya. — Vved. 01-01-2011. — M.: Standartinform, 2010. — 20 s.
8.Ishhenko, I. S. Texnologiya ustrojstva i remonta asfal'tobetonnyx pokrytij / I. S. Ishhenko, T. N. Kalashnikova, D. A. Semenov. — M.: Air-ART, 2001. — 169 s.
9.Inozemcev, A. A. Bitumomineral'nye materialy / A. A. Inozemcev. — L.: Izd-vo literatury po stroitel'stvu, 1972. — 94 s.
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10.Ladygin, B. I. Prochnost' i dolgovechnost' asfal'tobetona / B. I. Ladygin. –– Minsk: Nauka i texnika, 1972. — 187 c.
11.Zubkov, A. F. O nestacionarnoj teploperedache v processax stroitel'stva dorozhnyx pokrytij nezhestkogo tipa / A. F. Zubkov // Vestnik Tambov. gos. texn. un-ta. — 2007. — № 2. — S. 589—597.
12.Zubkov, A. F. Modelirovanie i raschet temperaturnyx rezhimov dorozhnyx odezhd nezhestkogo tipa v nestacionarnyx usloviyax: svidetel'stvo № 2006613129 o reg. programmy dlya E'VM, opubl. 5.09.2006.
13.SNiP 2.05.02-85*. Avtomobil'nye dorogi. — Vved. 01-01-1987. — M.: FGUP CPP, 2004. — 54 s.
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Issue № 1(29), 2016 |
ISSN 2075-0811 |
UDC 691.168: 625.855
Vl. P. Podolsky1, Nguyen Van Long2, Nguyen Khac Hao3, Nguyen Duc Sy4
THE STUDY OF OPERATING CAPACITY OF ASPHALT CONCRETE
MODIFIED WITH AN ADDITIVE WETFIX BE
Voronezh State University of Architecture and Civil Engineering Russia, Voronezh, tel.: (473)236-18-89, e-mail: ecodor@bk.ru
1D. Sc. in Engineering, Head of Dept. of Сonstruction and Operation of Highways, Prof.
Ho Chi Minh City University of Transport
Vietnam, Ho Chi Minh, tel.: +8-490-869-44-84, e-mail: long_gtvt@mail.ru 2PhD in Engineering
3Engineer
University of Technology of the University of Danang
Vietnam, Danang, tel.: +8-490-562-79-17, e-mail: ducnguyensy@yahoo com 4PhD in Engineering
Statement of the problem. The problem of increasing the operating capacity of asphalt pavements is very urgent. The practice of road construction shows that after the start of the operation there is rut formation on an asphalt surface and various defects and deformations, one of the main reasons for that is unsatisfactory adhesion of bitumen with a paving stone. One of the applied solution methods is the introduction of various modified additives in organic astringent. This paper presents the results of the study of the main physical, mechanical and operational properties of bitumen and asphalt concrete modified using an adhesive additive Wetfix BE.
Results. The paper presents a theoretical review of ways to increase the deformation stability of asphalt surface in high temperatures suggested by the authors. The results of the experimental studies are shown according to the estimation of the influence of adhesive additive Wetfix BE to physical, mechanical and operational properties of the bitumen SRC 60/70 and hot thick asphalt concrete BTN C12,5.
Conclusions. The results of the experimental research allow one to make a conclusion that application of an adhesive additive Wetfix BE bitumen adhesion with paving stone improves, the deformation stability of asphalt surface in high temperatures increases. A significant positive effect was identified using an adhesive additive Wetfix BE in number of 0,2 % on the bitumen mass for an increasing the operating capacity of asphalt pavements.
Keywords: asphalt concrete, bitumen, deformation stability, defects, rutting, adhesive additive, Wetfix BE, adhesion with the aggregate.
© Podolsky Vl. P., Nguen Van Long, Nguyen Khac Hao, Nguyen Duc Sy, 2016
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