Two Gray Gravel Of The Pilot Study

This "urban road project on the structure of the performance" issues as the background and one of lime fly ash stabilized gravel (usually referred to as the gray gravel) for the research object, in the internal and external stability of lime fly ash gravel the grass-roots level on the basis of performance against the Jinan City road projects lime fly ash stabilized gravel application to the actual situation of the grass-roots lime fly ash stabilized gravel conducted a certain amount of research experiments.From the choice of materials used, the gravel aggregate gradation of the Mixture composition of various materials, the strength of the formation mechanism and the effects of additives on the strength of lime, and other aspects of fly ash stabilized gravel mixture the mechanical properties and the primary use of the road performance of a more comprehensive study of single-particle aggregate and consecutive graded aggregate lime fly ash stabilized gravel mixture compared the performance of proposed inlay crowded skeleton structure of the dense Mixture composition of the grading structure design method.Strength lime fly ash stabilized gravel is an important indicator. It is the impact on many factors, not only by the performance of raw materials, such as lime, fly ash and the quality of gravel, but also by the amount of material impact, as the proportion of lime fly ash, lime fly ash the proportion of gravel and gravel and all kinds of different proportional impact, but also by the water content and the degree of compaction. The fly ash and lime role gravel aggregate in the study found that, with aggregate grading and Mixture respective proportion of the change, lime fly ash stabilized gravel mixture of intensity changes in the law.Contraction of lime fly ash stabilized gravel is another important indicator. In lime fly ash stabilized gravel, the aggregate could inhibit contraction cracking, fly ash will not be the overall contraction of the material have an adverse impact on cracking, did not fully remove the lime lime fly ash particles often led the late expansive gravel stability Cracking, too much lime lime content of fly ash will increase the contraction coefficient, excessive moisture-lime fly ash stabilized gravel from the early shrinkage cracking. Through strict control of lime fly ash stabilized gravel mixture of water and adjust lime, fly ash and water composition ratio of fly ash to lime own shrinkage control to a minimum, broken stability in the lime fly ash stone appropriately increase in the aggregate content, reducing the proportion of lime fly ash, so as to achieve the purpose of reducing shrinkage.Stability of gravel and lime fly ash admixture of the study, use of NaOH in the experiments, Na2CO3 and cement. By adding fly ash to lime additive, it does not have the intensity of the same age without additives than the intensity has increased, but the rate of increase was less than consistent with. Na2CO3 early enhance the best effect, cement early as Na2CO3 and enhance the effect of the strengthening effect of NaOH obvious. But are these types of cement admixture inside the cheapest price, the most convenient use of a common construction materials, when it is usually used in the use of a maximum of admixture. After early strength cement by adding significantly improved, and growth in strength with age, but later strength relative to the growth rate without cement mixture.Mix design is lime fly ash stabilized gravel foundation. Design is an important indicator of strength. Strength mainly from cementing material, cementing material, the higher the intensity of the higher intensity mixture while cementing material strength mainly from lime, fly ash from the two gel hydration products of the two affected the proportion of gel the quantity, thus affecting mixture of strength, in addition to the construction impact mixture operability and economy. Lime fly ash stabilized gravel mix design objective is to get the mixture of the pavement structure with the use of various performance requirements, through strict and accurate production control, and produce easy - paver compaction and relatively easy-to-use economy Mixture. Because of the raw material properties of discrete considerable, so far, has not put forward a purely theoretical calculation methods, the design method are usually calculated and experimental experience in the theory of combining method. Lime fly ash stabilized gravel mixture component design to follow this principle: aggregate materials, in order to reduce transportation costs; graded aggregate should be graded to meet certain requirements to facilitate quality control; binder dose reasonable, to meet the strength requirements of the possible excitation of the lower dosage to achieve the economic principles; meet quality requirements in the premise, as far as possible the use of cheaper materials.The lime fly ash stabilized gravel mixture of grassroots construction quality control and testing were discussed, that should have an impact on all aspects of quality control, including raw materials, mix design, the use of the mixing process mixing equipment, transportation, sharing shop, compaction, health and so on. Lime fly ash stabilized gravel should be conducted in the course of construction projects, including the degree of compaction testing, roughness, thickness, height vertical fault, width, strength, and other indicators. Through the construction of the pilot test, the subject content of the pilot study results meet regulatory requirements, to achieve the desired objectives.