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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

Active Publication Date: 2016-09-28
郑州市公路管理局 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The compaction test under each cement dosage should be carried out in parallel twice, that is, at least 6 compaction tests should be carried out for the same gradation, the workload is heavy and the test cycle is long

Method used

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  • Method for determining optimum water content and maximum dry density of cement-stabilized macadam
  • Method for determining optimum water content and maximum dry density of cement-stabilized macadam
  • Method for determining optimum water content and maximum dry density of cement-stabilized macadam

Examples

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Effect test

Embodiment 1

[0046] A method for determining optimum water content and maximum dry density of cement-stabilized crushed stone, comprising the following steps:

[0047] A. According to the design gradation, determine the weight percentage N of the aggregate on the sieve with a sieve diameter of 4.75mm c , the weight percentage N of the aggregate under the sieve f ;

[0048] B. Carry out the compaction test of cement-stabilized macadam under the cement dosage a, and obtain the maximum dry density ρ a , corresponding to the optimal water content ω a ;

[0049] C. Determination of the surface dry density ρ of the sieve aggregate (coarse aggregate) with a sieve diameter of 4.75mm c and water absorption ω c ;

[0050] D. Determination of the surface dry density ρ of the under-sieve aggregate (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-sieve aggregate wit...

Embodiment 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, the cement dosage is calculated by the method of the present invention on the basis that the cement dosage a is 3%. The optimum water content and maximum dry density are 5%.

[0103] When implementing step H, the cement dosage b is 5% into the formula (1), and when the calculated cement dosage is 5%, the optimal water content is 4.5%; the relevant parameters are brought into the formula (2), and the calculated cement When the dosage is 5%, the maximum dry density is 2.37g / cm 3 .

[0104] According to the compaction test, when the cement dosage b is 5%, the optimum water content is 4.4%, and the maximum dry density is 2.37g / cm 3 .

[0105] Visible, adopt the method of the present invention, when cement dose is 5%, the maximum dry density that calculates and optimum water content result and compaction test...

Embodiment 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, the cement dosage is calculated by the method of the present invention on the basis that the cement dosage a is 3%. The optimum water content and maximum dry density are at 6%.

[0108] When implementing step H, the cement dosage b is 6% into the formula (1), and when the calculated cement dosage is 5%, the optimal water content is 4.7%; the relevant parameters are brought into the formula (2), and the calculated cement When the dosage is 5%, the maximum dry density is 2.37g / cm 3 .

[0109] According to the compaction test, when the cement dosage b is 6%, the optimum water content is 4.5%, and the maximum dry density is 2.38g / cm 3 .

[0110] Visible, adopt the method of the present invention, when cement dose is 6%, the maximum dry density that calculates and optimum water content result and compaction t...

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Abstract

The invention provides a method for determining the optimum water content and the maximum dry density of cement-stabilized macadam. The method includes the steps that firstly, a compaction test of the cement-stabilized macadam under the cement dose a is conducted, and the maximum dry density rhoa and the optimum water content omegaa are obtained; secondly, the optimum water content omegab and the maximum dry density rhob under the cement dose b are calculated, wherein omegab=omegaa+m(b-a), another formula is shown in the description, m is the optimum water-cement ratio under the cement dose a, ic is the mixture hydration increment percent under the cement dose a, and rhocr is the cement density. By means of the method for determining the optimum water content and the maximum dry density of the cement-stabilized macadam, the workload of the compaction test of the cement-stabilized macadam material can be reduced, the test cycle can be shortened, and meanwhile the accuracy of the optimum water content and the maximum dry density can be guaranteed.

Description

technical field [0001] The invention belongs to the field of traffic civil engineering, and in particular relates to a method for determining the optimal water content and maximum dry density of cement-stabilized gravel. Background technique [0002] The compaction test method and the vibration compaction test method are the two most commonly used methods to determine the optimum water content and maximum dry density. For the gradation with more coarse aggregate content, the method stipulated in the current standard is the compaction test method. [0003] There are many factors that affect the compaction test results, but the compaction results are mainly related to the aggregate density, water absorption and gradation type. Relevant data show that there is little difference in the compaction results under the same gradation and different cement dosages. [0004] Cement-stabilized macadam is usually subjected to strength tests under multiple cement dosages, so it is necessa...

Claims

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Application Information

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IPC IPC(8): G01N33/42
CPCG01N33/42
Inventor 徐世法索智柴林林金珊珊许鹰段文志蔡硕果谢永清王春明
Owner 郑州市公路管理局
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