Experimental Study On The Ratio Of Semi-rigid Base Course Material In Jilin City

The base course material common used in pavement can be divided into four categories : one category is flexible base material, which includes graded aggregates, inlay lock-gravel and asphalt (stable) gravel mixture; The second type is semi-rigid base course materials. It includes cement stability category, lime stable category and industrial waste lime. The third category is rigid material, it concludes cement concrete, lean concrete and RCC; the fourth category is the composite base, the upper uses flexible base, the lower uses semi-rigid base.The form of base course currently used in China mainly has the following six types: cement-stabilized soil, lime-stabilized soil, industrial waste lime stabilized soil, graded gravel, graded gravel or grading gravel and interstitial aggregates.Take the semi-rigid base course in Jilin as engineering background, through extensive literature reading, based on summing up the study of the lime stabilized soil and lime-stabilized soil, study on the best dry density and unconfined compressive strength of lime stabilized soil and lime-stabilized soil. Specific studies include the following aspects :1. Summarized the status quo of lime stabilized soil and lime-fly ash stabilized soil at home and abroad;2. The formation mechanism and influence factors of lime soil, lime-fly ash base course strength;3. The best ratio test and construction control of lime soil in Jilin City area;4. The best ratio test and construction control of lime-fly ash lime soil in Jilin City area.Major soil tests include:1. Preparation and election: In accordance with the specimen obtained outdoor and indoor best in the preparation of water samples number. Ancillary equipment is compaction device, drying boxes, electronic balance. 2. Use compaction instrument to do compaction tests. Measuring the best water content and the corresponding maximum dry density of lime stabilized soil and lime-stabilized soil.3. Use electronic universal testing machine, measuring unconfined compressive strength of 7d and 14d. 28d of lime stabilized soil and lime-stabilized soil.4. Use "orthogonal" to process and analyze factors and the test data. Analysis of the test can be drawn:Aimed at the silty clay in Jilin City, in order to receive higher strength and durability, the dose of lime is increasing by the content of soil and the plasticity index. But when exceeds a certain dose range, too much lime in the soil gap exists in a free ash, lime soil will lead to a decline in the intensity. With the age growth, the lime dose intensity curve were on the rise.Coupled with different lime doses, its compressive strength also changes, but the same dose of lime is also related with different plasticity index. The soil plasticity index is higher (15.6), fine in Jilin, according to test results analysis, 14~16% lime dose is the best dose.For lime-fly ash stabilized soil base course, two primary factors which impact the strength are content of lime-fly ash and the ratio. In Jilin, the reasonable lime-fly ash content of lime-fly ash stabilized soil base course is about 30%, the ratio is 1:2~1:3, lime : Fly Ash : soil =10:20:70 this is the best ratio in Jilin; use the ratio of Lime : fly ash : soil = 10 : 20:70 to do the compressive test, seven days for the results of intensity is 1.332MPa which meets the request of strength greater than 0.8 MPa in freeway and first-glass highway base course. It is obvious that Fly Ash in Jilin City area can be directly used; As the region's climate, in the construction, the water content, condensate and other health relaxation control of lime-fly ash should pay attention to.