Cement stable regeneration aggregate gravel proportioning design method

A recycled aggregate and cement stabilization technology, applied in the direction of ratio control, instrument, control/regulation system, etc., can solve the problems of oblique shear force and vibration, low strength, poor test reproducibility, etc., to reduce drying shrinkage Cracking, reduced possibility, good effect of on-site construction

Active Publication Date: 2017-07-25
GUANGZHOU UNIVERSITY
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AI Technical Summary

Problems solved by technology

With the replacement of construction machinery and the advancement of on-site compaction technology, this test piece forming method can no longer be used to guide modern road construction
The heavy-duty compaction test method cannot simulate the on-site compaction mechanism. This experiment is to compact the material to be compacted by applying an impact load to the instrument. The oblique shear force and vibration of the road roller
[0006] Second, the 7d unconfined compression test in the traditional design method adopts the static pressure method to form the specimen. The volume characteristics of the specimen are quite different from the on-site wheel-rolling construction method, and its strength index is difficult to simulate the final on-site compression. real state
[0007] Third, the traditional des

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  • Cement stable regeneration aggregate gravel proportioning design method
  • Cement stable regeneration aggregate gravel proportioning design method
  • Cement stable regeneration aggregate gravel proportioning design method

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Embodiment 1

[0040] An embodiment of the cement-stabilized recycled aggregate gravel ratio design method of the present invention, the method described in this embodiment includes the following steps:

[0041] 1. Grading design:

[0042] First of all, according to the "Technical Rules for Road Pavement Base Construction" (JTG / T F20-2015), the synthetic gradation of mineral materials is selected, as shown in Table 1:

[0043] Table 1 Recommended grading range of cement-stabilized graded crushed stone or gravel

[0044]

[0045] 2. Select the amount of cement and water

[0046] Material technical index requirements are as follows:

[0047] (1) Water, cement

[0048] The water used should meet the specification "Concrete Mixing Water Standard", and the cement should also meet the requirements of the specification "Technical Rules for Road Pavement Base Construction" (JTG / T F20-2015). The initial setting time of the cement used should not exceed 3 hours, and the final setting time shoul...

Embodiment 2

[0089] An embodiment of the cement-stabilized recycled aggregate gravel ratio design method of the present invention, the method described in this embodiment is the same except that the number of settings of cement consumption is different from that of Embodiment 1, and includes the following steps:

[0090] 1. Determination of mineral gradation:

[0091] Summarize the best cement content and the ratio of each aggregate. The amount of water added should be appropriately increased by 1 to 2%; we have made several test pieces of cement dosage, and now we take 3 cement dosages as representatives; they are 3%, 5%, and 7% respectively. First determine the mineral material grading of each cement as shown in Tables 5 to 7:

[0092] Table 5 The mass percentage of 3% cement content passing through the sieve hole

[0093] particle size 31.5 26.5 19 16 13.2 9.5 4.75 2.36 1.18 0.6 0.3 0.15 0.075 Specification online 100 92.4 83.6 75.2 68.1 61.5 44.5 3...

Embodiment 3

[0104] In this embodiment, the maximum dry density-moisture content curve of the test piece in the method of the present invention is studied and analyzed. Such as figure 1 as shown, figure 1 There are three curves in total, representing the cement content of 3%, 5%, and 7% respectively. Each curve has 5 points in total. The ordinate is the density, and the abscissa is the water content at the corresponding density. The specimen is compacted 10 times in a row The accumulation of height changes of no more than 1mm is the standard for stopping compaction.

[0105] Depend on figure 1 It can be seen that the density of recycled aggregate cement stabilized macadam under the three kinds of cement dosage increases firstly and then decreases with the increase of water consumption, and the maximum dry density of the material is 2.084g / cm2 under the cement dosage of 3%. 3 , corresponding to the optimal water content of 8.29%; the maximum dry density of the material is 2.097g / cm when ...

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Abstract

The invention discloses a cement stable regeneration aggregate gravel proportioning design method, which comprises the following steps of (1) determining the mineral aggregate grading range; (2) setting a plurality of cement and water consumptions; respectively preparing cement regeneration aggregate gravel mixed materials; (3) shaping the cement stable regeneration aggregate gravel mixed materials obtained in the step (2) by a rotating compression method; using the accumulated height change being smaller than 1mm after the continuous 10 times of compression as a stopping standard; obtaining a relevant curve between the mixed material water content and the density; analyzing the curve to obtain the optimum water content and the maximum dry density of the mixed materials; (4) manufacturing a sample in the optimum water content and maximum dry density state; performing 7-day no-lateral-restraint pressure resistant intensity tests on a test specimen; determining the proportioning ratio of the cement stable regeneration aggregate gravel. The method has the advantages that the stress state of the material during the semi-rigid base layer construction can be better simulated; the design result can be used for better guiding the field construction.

Description

technical field [0001] The invention relates to a method for designing the proportion of cement-stabilized gravel, in particular to a method for designing the proportion of cement-stabilized recycled aggregate gravel. Background technique [0002] With the further development of urbanization in our country, a large number of construction wastes have been brought in the old city renovation project. The treatment of these construction wastes has become a difficult problem in major cities in our country. In recent years, my country has gradually attached importance to the green and sustainable development of society, such as the recycling of building materials, which helps to save national resources. However, our country started late in this field, although many policies have been introduced in the utilization of recycled aggregates from construction waste, and application technical regulations in the construction field have been compiled. However, since architectural recycled...

Claims

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Application Information

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IPC IPC(8): C04B28/02G05D11/00
CPCC04B28/02C04B2201/50G05D11/00C04B18/16C04B20/0076
Inventor 蔡旭吴旷怀黄文科谢若奇祝凤丹
Owner GUANGZHOU UNIVERSITY
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