路面稳定基层的修建.pdf

1、 Cement StabilizationThe application of cement into soil,that results in permanent physical and chemical alterations.Physical properties,such as strength and bearing capacity are enhanced,while expansivity and plasticity are reduced;thus creating more stable and suitable conditions for design and co

2、nstruction of pavement and building foundations.Design ConsiderationsTime and Cost Considerations Cost of import/export Cost of geotextile reinforcement Contractor time and equipment costs Availability and cost of specific admixturesRoadway StabilizationReclamation CostsItem Reclaim Remove/Replace C

3、ement$0.72 to$2.21-Aggregate-$1.52 to$4.57 Processing$1.00 to$2.50$0.75 to$2.00 Haul-$0.76 to$1.96 Landfill-$0.61 to$19.90 Total$1.72 to$4.71$3.64 to$28.43 Note:Costs are stated in U.S.dollars per square yardDiesel (gal)Landfill (cy)Material(tons)Truck Trips(Number)NewFDR1801245003002700030005001 Mi

4、le of 24-wide,2-lane road with a 6-inch baseReclamation-vs-New BaseHistory Cement used in soils since the early part of this century First engineered use in South Carolina,on State Route 41 in 1935 Joint research with South Carolina Highway Department and PCA Attempt to optimize both cement and mois

5、ture contents Systematized construction procedures Over 70 years of successful pavements across the United States and CanadaRetards Reflective CrackingLoad-carrying capacity of soil-cement and granular base.Base Thickness,inchesGranular BaseTotal Load,1000 lbThinner Pavement SectionUnstabilized Gran

6、ular BaseCement-Stabilized Base Cement-Treated Base Full-Depth ReclamationExample:A typically accepted rule-of-thumb is that 8 inches ofcrushed stone base is equal to 6 inches of FDR.Reduced Fatigue CrackingHigh deflection due tolow base stiffnessResults in high surface strains and eventual fatigue