Method for determining optimum water content and maximum dry density of cement-stabilized macadam
A cement-stabilized gravel and optimal water content technology, which is applied in the field of transportation civil engineering, can solve the problems of heavy workload and long test period, and achieve the effect of reducing workload, shortening test period and ensuring accuracy
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[0045] Example 1
[0046] A method for determining the optimum water content and maximum dry density of cement stabilized crushed stone, including the following steps:
[0047] A. According to the design gradation, determine the weight percentage N of the aggregate on the screen with a screen hole diameter of 4.75mm c , The weight percentage of aggregate under the screen N f ;
[0048] B. Carry out the compaction test of cement stabilized crushed stone under cement dosage a to obtain the maximum dry density ρ a , Corresponding to the optimal water content ω a ;
[0049] C. Determine the surface dry density ρ of the aggregate on the sieve (coarse aggregate) with a sieve diameter of 4.75mm c And water absorption ω c ;
[0050] D. Determine the surface dry density ρ of aggregate under the sieve (fine aggregate) with a sieve diameter of 4.75mm f And saturated surface dry water absorption ω f ;
[0051] E. Determination of cement density ρ cr ;
[0052] F. Mix the above-screen aggregate with a...
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[0101] Example 2
[0102] A method for determining the optimal water content and maximum dry density of cement stabilized crushed stone. The difference from Example 1 is that in this example, based on the cement dosage a of 3%, the method of the present invention is used to calculate the cement dosage The optimum moisture content and maximum dry density at 5%.
[0103] When step H is implemented, the cement dosage b is 5% into formula (1), when the calculated cement dosage is 5%, the optimal water content is 4.5%; the relevant parameters are entered into formula (2) to calculate the cement When the dose is 5%, the maximum dry density is 2.37g / cm 3 .
[0104] Using compaction test, when the cement dosage b is 5%, the best water content is 4.4% and the maximum dry density is 2.37g / cm 3 .
[0105] It can be seen that using the method of the present invention, when the cement dosage is 5%, the error between the calculated maximum dry density and optimal moisture content and the compactio...
Example Embodiment
[0106] Example 3
[0107] A method for determining the optimal water content and maximum dry density of cement stabilized crushed stone. The difference from Example 1 is that in this example, based on the cement dosage a of 3%, the method of the present invention is used to calculate the cement dosage The optimum moisture content and maximum dry density at 6%.
[0108] When implementing step H, put the cement dosage b of 6% into formula (1). When the calculated cement dosage is 5%, the optimal water content is 4.7%; put the relevant parameters into formula (2) to calculate the cement When the dose is 5%, the maximum dry density is 2.37g / cm 3 .
[0109] Using compaction test, when the cement dosage b is 6%, the best water content is 4.5% and the maximum dry density is 2.38g / cm 3 .
[0110] It can be seen that using the method of the present invention, when the cement dosage is 6%, the error between the calculated maximum dry density and optimal water content results and the compaction...
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