1.0 % 0.25 % 85μm 0.97 0.136 % U416 Sulfate expansion deformation law and mechanism of cement stabilized macadam base of saline areas in Xinjiang Song Liang 1,2 Wang Xuan-cang 1 1 School of Highway, Chang an University, Xi an 710064 2 Xinjiang Transportation Planning Surveying and Design Institute, Urumqi 830006 Abstract Based on the theory of sulfate crystallization expansion, the sulfate expansion deformation test of cement-stabilized gravel mixture was designed to further clarify the influence of sulfate on expansion deformation of cement stabilized macadam base. The sulfate expansion deformation law of cement stabilized macadam base material under different sulfate content and environmental humidity conditions were systematically studied. The sulfate expansion deformation mechanism of cement stabilized macadam base material was revealed. And the sulfate content in cement stabilized macadam base mixture was put forward. Reasonable control scope can provide some useful reference for the study of sulfate expansion deformation of cement stabilized macadam base in saline areas of South Xinjiang. The results show that when the sulfate content is less than 1.0 %, the total expansion deformation of the mixture increases by 85 μm with the increase of 0.25 % sulfate content. There is a good exponential relationship between sulfate content and expansion of cement stabilized macadam base materials, and the correlation coefficient is above 0.97. Sulfate content in cement stabilized macadam base mixture should be controlled within 0.136 %. Key words: road engineering, cement stabilized macadam base, sulfate expansion deformation, expansion mechanism, sulfate 2018 MS1 025 2018 6 3359559@qq.com
90% [1,2] [3,4] [5] [6] [7-9] [10] [11,12] [13] [14] [15] [16] [17,18] P.O 42.5 4.0 % 1 G30 12
2 3 SO 3 % Cl - % MgO % % 2.77 0.086 2.1 0.47 3.5 0.06 6.0 0.60 m SO 2-4 % % Cl - /SO 2-4 % 1 0.00 0.50 1.0008 1.6310 0.18 2 0.50 1.00 0.5782 0.8990 0.32 3 1.00 1.50 0.4387 0.7090 0.14 4 1.50 2.00 0.1632 0.2570 0.10 5 2.00 2.50 0.1680 0.2870 0.15 mm 31.5 19 9.5 4.75 2.36 0.6 0.075 100 86 58 32 28 15 3 % 100 68 38 22 16 8 0 100 77 48 27 22 11.5 1.5 100 74.7 38.0 29.6 22.3 13.4 1.8 2 1m 1m SO -2 4 0.3600 0.8040% Na 2 SO 4 0.2893 0.7850 % 40 % 0 0.25 % 0.50 %
1.0 % 2.0 % 40 % 60 % 80 % 32.4 [17,18] 60 min 60 min 30-5 5 60 min 1 35 30 25 20 15 10 5 0-5 -10 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 h 1 2 (JTG E51-2009) 100 mm 100 mm 400 mm 6d 32 ± 2 1 d 30 2 LEO 1430VP 3 4 1.0 %
3 LEO 1430VP 4-5 5 5 0.25 % 2.0 % 0.0325 % 0.08475 % 30-5 30 1.0 % 0.25 % 85 μm 30 20 20 5
6 a 0.25% b 0.5% c 1.0% 1 3 5 7 9 11 13 15 6 6 0.25 % 80 % 0.5 % 7 a b 1000 c d 2000
a b c d 7 SEM 7 a c 2000 7 b d 2000 7 d Na 2 SO 4 10H 2 O 7 c d
32.4 8 Na 2 S0 4 10H 2 O 40 35 30 25 /g 20 15 10 5 0-5 0 5 10 15 20 25 30 35 40 45 50 / 8 5-6 30 20 20 5 10 5 Na 2 S0 4 Na 2 S0 4 10H 2 O Na2S04 10H2O Na 2 SO 4 10H 2 O 1 0.25 % 1 40 % 80 % 0.5 % 0.025 % 1.0 %
0.063 % Orign 0.97 9 400 300 μm 200 100 0-100 y = A1*exp(-x/t1) Equation + y0 1142.26742 Reduced Chi-Sqr Adj. R-Square 0.97237 Value Standard Error y0 311.92617 27.44712 A1-491.46745 41.69822 t1 0.29742 0.06113 μm k 3.3623 0.69111 tau 0.20615 0.04237 0.0 0.5 1.0 1.5 2.0 2.5 % -200 9 y 491.47 exp( n / 0.29) 311.93 2 μm n % y =0 y =0 n=0.136% y
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