| Various stone materials,cement and lime are the main raw materials for highway construction.Nowadays,with the gradual improvement of infrastructure construction,the problem of material shortage is increasingly prominent due to the consumption of a large number of projects.A large number of rock mining causes vegetation destruction,soil and water loss,and the production of cement and lime causes environmental pollution.The key to solve the problem is to choose appropriate road building materials and reduce rock quarrying.To solve these problems,in this paper,a new type of ion-polymer compound soil stabilizer(APS)is introduced.In some soil environments,APS can replace the traditional materials such as lime and cement to improve the soft subgrade soil.It can also directly pave low-grade roads or temporary roads,and can also be used in the geo-engineering of agricultural and water conservancy construction.In order to study the stability of the new soil stabilizer APS,the red clay and loess commonly used in highway engineering in Chongqing area and a silt in Foshan area were selected in this paper to improve their curing effect,and the feasibility of using stabilized soil as subgrade filling was verified.Firstly,the physical properties of three kinds of test soils were studied by water content and p H,particle screening and limit water content tests.Then the optimum dosage of stabilizer was determined by compaction test and unconfined compressive strength test.Then,the road performance of APS stable soil was analyzed by California bearing ratio(CBR),splitting test,rebound modulus test and direct shear test,and the influence of water content,age and compaction degree on the road performance of APS stable soil was further studied.Finally,compared with the lime and cement stabilized soil subgrade,the economic cost of APS stabilized soil as subgrade filler was analyzed,and the environmental benefit of APS stabilized soil was discussed through the composition analysis of stabilizer and potted plant growth test.The results show that:(1)The three APS stabilized soils as subgrade fillings can fully meet the road performance requirements,and red clay has the best improvement effect.The optimal dosage of APS stabilizer(0.5L/m~3 for red clay,0.3L/m~3 for silt and0.5L/m~3 for loess).APS stabilized red clay can reach 1.05MPa-2.23MPa compressive strength after curing for 3 days.,which has a great advantage in age.(2)Under the same APS content(0.3L/m~3)and 3-day age,the unconfined compressive strength of red clay is 47%higher than that of loess and 87.6%higher than that of silt.The APS stabilizer has a good effect in reducing the swelling property of clay particles and increasing the CBR value of soil.When the compaction is 98 times,the CBR value of red clay increases by 89.7%,that of loess increases by 58.3%,and that of silt increases by 22.5%.(3)The higher the compaction degree is,the higher the rebound modulus is.The rebound modulus of 98%compaction degree is 50%higher than that of plain soil.Compared with plain soil,the splitting strength of the three kinds of stable soil is greatly increased,especially the red clay.Through a series of physical and chemical reactions,APS stabilizer forms a more compact layered stacked structure,which enhances the bonding strength,shear strength and stability of soil particles.(4)the APS type stabilizer is ion-polymer stabilizers,itself does not contain toxic heavy metals,soil subgrade soil are routine test,contains no pollution,accord with national solid waste emissions standards,with its as the roadbed backfill material no secondary pollution,no inhibition effect on germination growth,environmentally friendly and can save cost. |
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