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Rubble mixed red clay aggregate and preparation method thereof

A technology of laterite granules and preparation methods, which is applied in roads, road repairs, roads, etc., can solve the problems that the CBR value of laterite granules cannot meet the specification requirements, the performance of natural laterite granules varies greatly, and the performance is not completely consistent. Achieve high engineering application value, improve poor grading, and good economic benefits

Active Publication Date: 2016-10-12
CHINA ROAD & BRIDGE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The performance of natural laterite aggregates in different regions is quite different, even in the same region, the performance is not completely consistent, and the CBR value of laterite aggregates in some stockyards in Equatorial Guinea cannot meet the requirements of existing specifications

Method used

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  • Rubble mixed red clay aggregate and preparation method thereof
  • Rubble mixed red clay aggregate and preparation method thereof
  • Rubble mixed red clay aggregate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The laterite aggregates from the Babo road section in Equatorial Guinea and the unscreened crushed stone produced by the rock rolling field were selected as raw materials, and their material properties are shown in Table 1 and Table 2 below, respectively.

[0054] Table 1 Screening results of laterite aggregates in Babo road section

[0055] Mesh size(mm) 31.5 9.5 4.75 2.36 1.18 0.6 0.3 0.15 0.075 Natural Grading Passed (%) 100 87 54 36 33 32 31 29 27 Compaction grading passed (%) 100 93 78 54 42 39 35 31 30

[0056] Table 2 Screening results of unscreened gravel in Babo road section

[0057] Mesh size(mm) 31.5 19 9.5 4.75 2.36 0.6 0.075 Passing rate(%) 100 71.2 37.5 19.1 10.2 4.2 1.2

[0058] It can be obtained from the natural gradation and gradation after compaction of natural laterite granules. The mixing amount of the primary crushed stone is selected as 2%, 4%, 6%, and 8%, and the...

Embodiment 2

[0063] The laterite aggregates from the Bindong road section in Equatorial Guinea and the unscreened gravel produced by the rock rolling field were selected as raw materials, and their material properties are shown in Table 3 and Table 4 below, respectively.

[0064] Table 3 Screening results of laterite aggregates in Bindong road section

[0065]

[0066] Table 4 Screening results of unscreened gravel in Bindong road section

[0067]

[0068] The natural gradation and gradation after compaction of natural laterite pellets can be obtained. The mixing amount of the primary crushed stone is selected as 2%, 4%, 6%, and 8%, and the primary mixture is prepared by mixing, and 5 groups of test 3 different parallel test pieces were taken for each group of test pieces; after that, the second-level mixture was prepared with the third group of granules, and 5 sets of test pieces were prepared, and 3 different parallel test pieces were taken for each group of test pieces. The resul...

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Abstract

The invention discloses a preparation method of rubble mixed red clay aggregate. The preparation method includes the steps that (1) the prototype gradation and the target gradation of natural red clay aggregate are determined; (2) the compression gradation of the natural red clay aggregate is determined; (3) the difference value between the target gradation and the prototype gradation and the difference value between the target gradation and the compression gradation are worked out correspondingly; and (4) a first-grade aggregate set and a second-grade aggregate set are mixed, so that a primary mixture is obtained, the optimal d value corresponding to the maximum CBR value is determined, then a third-grade aggregate set is mixed into the primary mixture corresponding to the optimal d value, and the optimal e value corresponding to the maximum CBR value is determined. The invention further provides the rubble mixed red clay aggregate. Due to the fact that a specific proportion of rubbles are mixed in the aggregate, the defect that natural red clay aggregate is poor in gradation and not high in bearing capacity is overcome, and the novel aggregate high in bearing capacity is finally obtained.

Description

technical field [0001] The invention relates to a road surface flexible (bottom) base engineering technology, in particular to a gravel-mixed laterite granular material and a preparation method thereof. Background technique [0002] Natural laterite aggregates are widely distributed in West Africa and are generally used as subbase materials for road pavement structures of low-grade traffic. However, natural laterite aggregates have less coarse particle content, missing particles in the middle particle size range, and higher fine-grained soil content, which is a poorly graded road material. The degree of nodules in Equatorial Guinea laterite aggregates is high, the breakage rate is low during compaction, and the possibility of particle breakage to improve gradation is small. The performance of natural laterite aggregates in different regions is quite different, even in the same region, the performance is not completely consistent. The CBR value of laterite aggregates in some...

Claims

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Application Information

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IPC IPC(8): E01C3/04
CPCE01C3/04E01C2201/04
Inventor 钱劲松贾其军罗志刚汪淼周广利张瑞菊曾峰
Owner CHINA ROAD & BRIDGE
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