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Wysłany: Czw 12:21, 13 Sty 2011
Temat postu: ugg online bestellen To ensure the quality of high
To ensure the quality of highway construction should pay attention to the problem
Gravel), cement stabilized crushed stone and other high strength semi-rigid road base. But the test by driving there are some problems with the road base strength increases, increase the dosage of cement, grass-roots appear vertical and horizontal cracks are even more prominent. Semi-rigid base to reduce the cracks, to be resolved through experiment. Soil with lime, cement and lime stabilized soil base structure mechanized units have been used for many years the structure of the domestic call-out limestone soil has often occurred, but the lack of sand, stone of the region, will be primary to sand, stone structure, funding and unbearable, should be do (on page 28 under the hold) Hfgh. ~ Public ysAutom and otive: begging AppZi Games cations200 August 1 & years on the auxiliary press 1nl × 45. Pull and dig shallow intervals, wide grass covered 2OCEll, plus tight beat with a wooden hammer nails. Branch box sowing fertilizer, planting the seeds in soil mixing: This method is less dense than the economy but the results are paved, only source of difficulties for the grass Lot: ③ grid method; with three-dimensional geogrid shop on level ground, and then then covered with loam and grass seed, to be rolled up after germination grass, holes and nail in the slope of. Protection due to grid, developed root system, air circulation, not to the loss of loam, grass thrives. Can be used for steep slopes, hard soil or soft rock weathering compared with traditional methods has grown convenient, available factory crane laying, time-saving advantages: @ stack Shop Act = the turf stack flat shop for reinforcement toe, to fill the gully erosion protection. 23 trees present, in highway construction, taking into account traffic speed, traffic sight distance requirements of large street trees planted along the roadsides and generally do not. However, many doctors in Shenzhen in the construction of a highway, in the filling section grading according to the design after 1 ~ 2m high green platform located 2m wide, planted trees, the use of post-show: can guide traffic, played induced sight the role, but also greening and beautification of the highway landscape, and has good slope protection and erosion protection effect 3 Conclusion green slope protection plant growth so that the overall stability of the slope to the center, involving civil engineering and plant Study: For the different locations and conditions, how to effectively choose the green slope protection method is both simple and complex issue fork, but also a systematic project, to be taken into account. Received ~ 20,010,
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,604 (Continued from page 26) to study how fast Jing Mixed by adding the method to improve structural strength of lime soil and impact strength. 3 surface structure in Zhumadian areas, strong theoretical base has been at the leading position in Thin, asphalt surface asphalt surfacing to use more gravel or asphalt structure, the thickness of most of not more than 5cm. There is no structural design calculations as the structural layer, just as the wearing surface of the above, simply increasing the thickness of asphalt surface layer due to the strength and porosity and unrealistic restrictions on the existing large axle load of vehicles, one-sided pursuit of grass-roots strength together to improve not practical, so that only the grassroots, unified surface considered resolved. Appropriate increase in the surface layer thickness can be reduced base thickness, while reducing the pavement cracks, forks and asphalt base pavement structure to be introduced. Asphalt concrete surface layer is dense, high strength surface layer, it can reduce flooding and road pavement cracks, but at the same level across the required materials, construction machinery, construction technology have made higher and more stringent requirements; first asphalt. Present higher levels of domestic asphalt ancient wax,
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, poor thermal stability, cracking capacity is weak, adding other materials to be improved through the merits attention. Zhumadian 1996, the total road section and Xi'an Highway University, Xu bleeding in the Second Section of the asphalt road test. Who made the asphalt in the mixed waste plastics, used to increase the viscosity of asphalt and elongation, the effect is good and because of using high quality imported asphalt. Followed by sand and gravel materials, stone materials market currently lacks the necessary quality control management measures, the strength of stone,
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, crushing the value of common specifications do not meet the requirements of the situation, to test people trouble. Also increased the difficulty of construction. To be used in the construction of the second screening of the new mixing machine, to get a more reasonable aggregate gradation. The third is the determination of asphalt: asphalt content testing the construction site, has been using coal, diesel fuel burned clean slate and a simple way, because the amount of aggregates in the clay can not be determined. There are not allowed to measure the asphalt content,
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, aggregate ratio out the problem of low high real, the proposed extraction using rotating asphalt content was measured asphalt content to meet the requirements of mechanized construction. Fourth, the compacted asphalt surface. The density of asphalt pavement surface layer related to the strength and permeability. Of surface layer effects. Construction, paving confidential continuous operation to minimize downtime and Jiecha; master the material of the Whetstone temperature, time rolling, rolling to ensure that the number of times to meet regulatory requirements. Received :2001 -02-22
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