[5]
147 Effective porosity (%).
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[18]
6 Permeation coefficient (cm/S).
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21 Refer to Table 4 on intuitive analysis results for unconfined compressive strength testing: Table 4 Intuitive analysis results for unconfined compressive strength Factor Index Cement Fine aggregate consumption Crushing value I/3 II/3 III/3 R I/3 II/3 III/3 R I/3 II/3 III/3 R Result.
DOI: 10.5353/th_991044112388503414
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423 Analyzing the said testing results, we can conclude that, ranking of the influential factors is cement dosage> building stone crushing value>fine aggregate consumption, and influences by the fine aggregate are very small. Refer to Table 5 on variance analysis result of the unconfined compressive strength: Table 5 Variance analysis result of unconfined compressive strength Variance source Sum of square of deviation Freedom of motion S/f F ratio Level of significance A (cement dosage).
DOI: 10.15406/mojce.2018.04.00111
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[54]
2 Level of significance α=0. 05: significant B (Fine aggregate consumption).
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9 Insignificant C (Stone crushing value).
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[19]
3 Level of significance α=0. 05: significant Error.
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0075 Seen from Table 5, the cement dosage and aggregate crushing value (strength nature) are main indexes affecting the CTPB strength, and aggregate with high strength shall be selected in priority to ensure cement consumption. Effective porosity of drainage foundation layer. Porosity of Cement treated permeable base is classified into complete porosity and effective porosity, the complete porosity refers to the sum of all porosities of Cement treated permeable base, and the effective porosity refers to the sum of porosities communicated in the Cement treated permeable base capable of draining and is more valuable for the CTPB foundation layer. Refer to Table 6 on the intuitive analysis results of the effective porosity. Table 6 Intuitive analysis result of intuitive porosity Factor Index Cement Fine aggregate consumption Crushing value I/3 II/3 III/3 R I/3 II/3 III/3 R I/3 II/3 III/3 R Result.
DOI: 10.1016/0008-8846(87)90054-8
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7 Seen from Table 6, the factor affecting the effective porosity most is the cement dosage then the fine aggregate consumption. Refer to Table 7 on variance analysis result of the effective porosity. Table 7 Variance analysis results of effective porosity Variance source Sum of square of deviation Freedom of motion S/f F ratio Level of significance A (Cement dosage).
DOI: 10.7717/peerj.10809/supp-4
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[14]
75 338. 97 Level of significance α=0. 01: significant B (Fine aggregate consumption).
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[5]
34 122. 64 Level of significance α=0. 01: significant C (Stone crushing value).
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[8]
97 Insignificant Error.
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044 Seen from the Table above, the significant factors affecting the effective porosity are cement consumption and fine aggregate content. To ensure relatively higher effective porosity, the mixing ratio shall be designed to reduce the cement and fine aggregate consumption as much as possible to ensure the effective porosity of CTPB. Permeation coefficient of Cement treated permeable base. The permeation coefficient of gravel drainage foundation layer for cement stability is another important parameter representing its performance, and is analyzed and calculated in accordance with the Darcy Law. The constant head method is adopted by the test in this paper to measure the permeation coefficient, and the critical hydraulic gradient is 0. 04. Refer to Table 8 on intuitive analysis results of the testing results: Table 8 Intuitive analysis results of permeation coefficient Factor Index Cement Fine aggregate consumption Crushing value I/3 II/3 III/3 R I/3 II/3 III/3 R I/3 II/3 III/3 R Result.
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06 Seen from the Table, consumption of the cement and fine aggregate has a great influence on the permeation coefficient. Refer to the Table below on the variance analysis results: Table 9 Variance analysis results of permeation coefficient Variance source Sum of square of deviation Freedom of motion S/f F ratio Level of significance A (cement dosage).
DOI: 10.7717/peerj.10809/supp-4
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[1]
392 146. 5 Level of significance α=0. 01: significant B (Fine aggregate consumption).
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[21]
4 Level of significance α=0. 05: significant C (stone crushing value).
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3 Insignificant Error.
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019 2 Seen from the Table above, the cement dosage has a great influence on the permeation coefficient, with the fine aggregate consumption secondary and the crushing value of the aggregate has the least influences on the permeation coefficient. Test road project In accordance with the said research results, we paved the test road at bid AP1 of Dechang Express Highway in Jiangxi Province. The aggregate is produced at Xingang Mountaion in Dexing, the aggregate crushing value is 11. 1%. Through the indoor test, the cement dosage is 9. 5% and the water cement ratio is 0. 42. Refer to the Table below on the design results: Table 10 Indoor design results of CTPB foundation layer Design result Layer Cement dosage（%） Water cement ratio Unconfined compressive strength testing (7d, Mpa) Complete porosity n0（%） Effective porosity ne（%） Permeation coefficient（cm/S） CTPB foundation layer.
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52 Technical requirements / / >5. 0 / >18 >1. 0 On the testing road with construction completed, we cored and performed the testing for porosity, permeation coefficient and other indexes. Refer to the Table11 below on the results: Table 11 Testing results of the CTPB foundation layer field testing (average value) Result Layer Cement dosage (%) Unconfined compressive strength test (7d, Mpa) Complete porosity n0（%） Effective porosity ne（%） Permeation coefficient（cm/S） CTPB foundation layer.
DOI: 10.1016/b978-0-12-386027-9.00008-3
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[1]
62 Technical requirements / >5. 0 / >18 >1. 0 The field testing results can satisfy the design requirements, and the strength and permeation capability can satisfy requirements. Conclusion The indoor test is carried out with the orthogonal testing and the field testing research, with conclusions as follows: (1) The cement dosage is a key index for Cement treated permeable base, namely to ensure the strength of the CTPB, and relatively high cement consumption reduce effective porosity and permeation coefficient of the CTPB. (2) The fine aggregate consumptions in the CTPB have less influences on the strength and greater influences on effective porosity and permeation coefficient, so the fine aggregate consumption shall be reduced as much as possible in the design. (3) Crushing value of the aggregate has a great influence on strength, and crushing of aggregate in construction has a certain influence on the effective porosity and a less influence on permeation performance of the CTPB.
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