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Method for designing compact water-stabilized crushed stone subbase and its mixture ratio at one time

A water-stabilized crushed stone and compact technology, applied in roads, road repairs, roads, etc., can solve the problem of broken stones, cannot judge the gradation and compactness of synthetic mineral materials well, and does not give the ratio design water stability The judging method of crushed stone mixture and other issues can achieve the effect of improving comprehensive performance, facilitating engineering material preparation, and reducing test investment

Inactive Publication Date: 2018-12-18
SHANDONG TIEZHENG PROJECT EXPERIMENT & INSPECTION CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The current specification "Technical Rules for Road Pavement Base Construction" (JTG / T F20-2015) also does not provide a method for judging the compactness of the water-stabilized gravel mixture during the proportioning design process. After the water-stabilized gravel is compacted or formed by static pressure All the test pieces will have crushed stones, and the relationship between the gradation of synthetic mineral materials and the compactness cannot be well judged.

Method used

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  • Method for designing compact water-stabilized crushed stone subbase and its mixture ratio at one time
  • Method for designing compact water-stabilized crushed stone subbase and its mixture ratio at one time
  • Method for designing compact water-stabilized crushed stone subbase and its mixture ratio at one time

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Experimental program
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Effect test

Embodiment 1

[0025] A method for one-time design of dense water-stabilized gravel subbase and base mix ratio, the specific steps are as follows.

[0026] Step 1, select the unified gradation type for sub-base and base.

[0027] A certain national highway in Inner Mongolia is dedicated to coal transportation, and there are many overweight vehicles, and the local area is arid and the extreme low temperature can reach -28°C.

[0028] In terms of structural load-bearing and crack resistance, both the subbase and base course adopt a dense skeleton structure, and the gradation is close to C-B-3. The recommended gradation is shown in Table 1, and the finer C-B-1 (as the subbase) and C-B-2 (as the The base layer) has more advantages than the latter, which has finer gradation, low load-bearing capacity, easy to crack, and requires multiple designs and a lot of experimental work.

[0029] Step 2, select dense gradation.

[0030] Design 3 mineral material gradations;

[0031] Table 1 gradation of ...

Embodiment 2

[0047] A method for one-time design of dense water-stabilized gravel subbase and base mix ratio, the specific steps are as follows.

[0048] Step 1, select the unified gradation type for sub-base and base.

[0049] There are many vehicles on a certain expressway in Chongqing, and it has the characteristics of high temperature and rain in summer and warm winter.

[0050] In terms of structural load-bearing and crack resistance, both the subbase and base course adopt a dense skeleton structure, and the gradation is close to C-B-3. The recommended gradation is shown in Table 1, and the finer C-B-1 (as the subbase) and C-B-2 (as the Compared with the base layer), it has more advantages, and can realize the problem of large load-bearing weight and high temperature during construction, which is easy to cause cracks. The integrated design saves the workload of the test in the design.

[0051] Step 2, select dense gradation.

[0052] Design 3 mineral material gradations, and the mat...

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Abstract

The invention discloses a method for designing once-through dense water-stable crushed stone subbase and base mixture ratio, which is characterized in that the method comprises the following steps: step 1, the subbase adopts unified gradation, which conforms to the recommended range; step 2, the subbase adopts unified gradation. 2, a gradation with better compactness is selected in accord with compaction; 3, a dosage of cement is selected for testing cover that subbase and the base; 4, determine that optimum water content and the standard maximum dry density; 5, for that test piece and the compaction standard is unified to 98 percent; 6, that subbase and the cement dosage of the base are synthetically determined based on various circumstance. The invention can save more than 50% of the test workload, shorten the design period of the mixture ratio, and realize the advance of the project commencement time. Added the compactness judgment link, the method is more scientific; does not add instruments and equipment, nor special instruments; Subbase, base used share same stone specifications for preparation. Therefore, the water-stabilized crushed stone design method of the invention is easier to be popularized and applied in engineering.

Description

technical field [0001] The invention relates to the technical field of research on road base materials, and specifically discloses a method for one-time design of a dense water-stabilized gravel sub-base and the mix ratio of the base. Background technique [0002] The traditional design method of water-stabilized crushed stone adopts the separate design of subbase and base, and adopts mineral material gradation of different thicknesses. When designing according to the current specification "Technical Rules for Construction of Highway Pavement Base" (JTG / T F20-2015), it is necessary to Carry out compaction and strength inspections for 5 cement dosages respectively, and the workload is relatively large. For projects with a short construction period that urgently need to be started, there are situations such as waiting for proportioning and delaying the start of construction. [0003] The current specification "Technical Rules for Road Pavement Base Construction" (JTG / T F20-201...

Claims

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Application Information

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IPC IPC(8): E01C21/00E01C3/04
CPCE01C3/04E01C21/00
Inventor 杨树人苏磊李凤华韩静刘娟黄贤慧孙景超高英杰
Owner SHANDONG TIEZHENG PROJECT EXPERIMENT & INSPECTION CENT
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