| Develop continuously along with my national economy, the highway transport is continuously developments, the request of pavement is to have a good of neat a comfortable for a car, the more important is to requests the pavement structure layer is to have the good usage function, every kind of disease harm can be delayed or alleviated such as rut, crack, removal and every kind of the damage of waters. Pavement structure layer inside base course is usage quantity of main supporting course, its usage direct influence the function pavement. The typical model of the semi-rigid material is. For this reason, and this thesis research is to use polypropylene fiber reinforced lime-fly ash aggregate. Increase usage function of pavement.This thesis chooses the material is polypropylene, polypropylene is a high polymers thing, and this mechanics function is good with the enduring. Select by examinations, lime-fly ash aggregate match ratio lime: fly ash: aggregate =5:15:80.The polypropylene fiber take length 5 cm,7 cm,9 cm with add 0.5‰ of deal,0.7‰,1‰,1.2‰,( quantity ratio) add lime-fly ash aggregate mixture inside, make into the standard try piece, proceed various experiments.To discover after pressing experiment polypropylene fiber reinforced lime-fly ash aggregate in 7 days,28 days compressive strength compare with common lime-fly ash aggregate have no difference, 60 days compressive strength obvious higher than common lime-fly ash aggregate,60 days compressive strength increased roughly 10%, 180 days compressive strength increased roughly 18.3%.And fiber length 9 cm, add deal 1‰ anti- press strength larger.Analyzing result of the polypropylene reinforces lime-fly ash aggregate the modulus of resilience experiment, lime-fly ash aggregate add the fiber, the modulus of resilience has to lower, different length, different add the deal amount of mold lower the degree different. When fiber adds 1‰ of deal, the amount of mold is lowest. Compare with common lime-fly ash aggregate the amount of mold lowers to 46.8%.The anti- presses the modulus of resilience lower and can reduce the flexural-tensile stress of the material bottom. This mean the probability of the base course breakage too let up.For studying the anti- freezing function of the polypropylene reinforced lime-fly ash aggregate distinguish 28 days, 90 days are 10 times frost thawing circulation the anti- presses the strength experiments, the analysis experiments the result, whether 28 days or 90 days, the polypropylene reinforced lime-fly ash aggregate frost thawing is obvious higher than common lime-fly ash aggregate. The frost thawing empress mass defect is smaller than common lime-fly ash aggregate. For this reason polypropylene reinforced lime-fly ash aggregate can strengthen the anti- freezing function availably in earlier period, combining can resist damage of frost thawing in wetting area.This paper studies anti-fatigue characteristic of the polypropylene reinforced lime-fly ash aggregate. In the same period the anti-strain strength of the polypropylene reinforced lime-fly ash aggregate is higher than common lime-fly ash aggregate, the amount of mold lets up, and lower to the vehicle function sensitivity. Joining the fiber empress can prolong life span. therefore exits coefficient of tenacity, ,。In this thesis study the temperature and shrinkage of the polypropylene reinforced lime-fly ash aggregate. The max temperature shrinkage coefficient 28 days and 60 days is smaller than common lime-fly ash aggregate. Along with the strength the period increase, the fiber represses the function to the material shrinkage gradually appears, the fibrous and bent function effect, high fork function is gradually appears, from dry shrinkage test, adding fiber the dry shrinkage coefficient the obvious smaller than common lime-fly ash aggregate. Also the fiber add 1‰of deal, the length of 9cm two kinds of shrinkages ability is best ,to express the advantage in temperature reduced clearly.From to the economic performance analysis of that mate... |
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