1、专业 外文翻译 原文 road surface of pitch 1 Debulk 1.1 Summary Good pitch road surface quality is it reflect , appear any quality defect will all that has been achieved has come to nothing in rolling through rolling to want. The durable performance of meeting pitch road surface of the structure demand is aff
2、ected by two indexes mainly, namely the mixture and debulk designed. In these two indexes , lack any durable performance that cant ensure the pitch road surface , if insufficient debulk, optimum mixture that design will reduce serviceability , pitch of road surface, and good debulk can improve the r
3、esult of a kind of nonstandard mixture effectively . So, debulk is considered to influence one of the most important factors of durable performance of road surface of pitch . Debulk course to reduce pitch course , air vent of content in the mixture, for solid particle stemming and orientating among
4、one viscoplasticity medium course this, in the form of forming a kind of closely more knit and more effective particle to arrange. This course only takes place under the construction state in theory, but not under the traffic condition. 1.2 Impact on debulk of composition material on the pitch road
5、surface 1.2.1 collects material performance in order to reach the ideal solidity of pressing, it is very important to collect material and detailed some nature of collecting material thickly: Such as the particle form, raised angle , the absorbing water rate and surface are constructed, grade mix mi
6、xture most heavy to collect material size , thick to collect material proportion , consumption and type ,etc. , consumption of sand and powder of ore pigeonhole to pitch mixture solidity have direct influence. Under the same situation as other indexes , collect material one grade of mixture or disco
7、nnected grade mixed and mix mixture than exchanging debulk more than the single size from thick to the detailed even grade of mixture mixed , thick to collect material proportion heavy pitch mixture, must increase the strength of keeping notably , could obtain the necessary space rate . On the other
8、 hand, many sand, or detailed grade buy bituminous concrete to be very much easy to be plastic, this kind of mixture is still difficult to reach proper closely knit degree. The pitch mixture of much sand tends towards pushes and shoves and difficult with debulking under debulk function . The differe
9、nt kinds of packing has remarkable influence on debulk of the pitch mixture, according to survey, in a situation that other conditions are the same, ordinary silicate packing than lime stone ore powder pitch mixture and cement stone pitch mixture easy debulk bituminous concrete, pitch mixture total
10、hole rate too very heavy difference have behind the shaping, 8% , 9.1% , 12% respectively. 1.2.2 pitch viscidity influence pitch viscidity influence pitch mixture strength degree, and can debulk nature have something to do with mixture. At the mixture, high viscidity can pin down particle move often
11、 as debulk pitch, if pitch viscidity too low, is it collect material to be particle easy to move and push and shove in real time to press. When pitch mixture temperature is higher, pitch is it is it collect material particle rub lubricant of obstruction to overcome to make, when the mixture has alre
12、ady been cooled, the pitch makes and combines the combination material which is collected the material particle. Generally speaking, in fixed 135 pitch being viscidity high,resistance, mixture of person who reduces space the heavier. So use high viscidity at the pitch , adopt higher debulk temperatu
13、re to reduce viscidity promote pitch road surface but debulk essential means. Show according to materials data give temperature definitely , low drip of viscidity educate than high closely knit high degree that pitch reach of viscidity, through rise debulk temperature, high viscidity drip is it can
14、reach high solidity of pigeonholing as low viscidity pitch to educate. Therefore understand debulk state , pitch of viscidity under the temperature to promote pitch road surface good debulk there are important meanings. 1.2.3 performance of mixture influence in fact, performance , pitch of mixture,
15、influence degree, road surface of debulk the heaviest to pitch, the influence than simple to collect material or drip breed obvious even. When pitch consumption is lower in the pitch mixture easy to is it do astringent , coarse mixture to form, often difficult debulk； When pitch consumption is too g
16、reat, can form and lubricate the mixture excessivly , make the mixture under the function of the road roller, form unstable and can fracture ing , mixture suffused with the oil after the traffic is open； For lower than best pitch mixture of consumption, can through increase efficiency , debulk of co
17、urse reduce the space rate, reach a kind of satisfaction； But if pitch consumption at the optimum value of higher thanning , press real-time , cant prevent out of shape limit , pitch of mixture from almost； Secondly , collect material water content meet the requirement of norm minimum while drying,
18、such wet pitch mixture, present the inclination moved in the course of debulk, it is very difficult for the result to press worker. 1.3 Temperature impact on pitch road surface debulk pitch debulk performance , mixture of road surface receive match ratio design, influence of factor, variety of pitch
19、 and temperature ,etc. of debulk, it is the most influential but with debulk temperature. As everyone knows, the properties of pitch and pitch mixture are very sensitive to temperature, is it can know (125C 1130 ) in the same grade is it under the mixture , roll rising of temperature at the same tim
20、e to mix to test. Mixture try on pieces of density increase , air rate reduce , until a certain temperature (145 1150 ) , mixture try on a density up to most heavy, at the same time the air rate is dropped to minimumly . If is it rise to continue under temperature this, can make density reduce, atmo
21、sphere rate increases. It is obvious temperature of mixture on the low side on the high side , will influence density and air rate , pitch of mixture (pigeonhole the solidity). The temperature of the pitch mixture is very important too in debulk of the construction site mixture. The temperature of t
22、he mixture has already become one of the two major factors influencing the solidity of high pressure of construction site and low air rate. Dark- Kui expressway layers of grains of type in being thick for 4cm the pitch. Construct location windy (4-5), organize the pitch but layer construct in with high temperatures period only, keep temperature bring 80 one 90 up to , make layer receive further debulk the pitch after all.
