Cement-doped graded broken stone drying shrinkage detector

A technology of grading crushed stones and detectors, applied in the direction of material inspection products, etc., to achieve the effects of reducing labor intensity, improving test accuracy, and convenient use

Inactive Publication Date: 2016-01-06
CHINA RAILWAY FIFTH SURVEY & DESIGN INST GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no equipment for dry shrinkage detection of cement-graded crushed stone

Method used

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  • Cement-doped graded broken stone drying shrinkage detector
  • Cement-doped graded broken stone drying shrinkage detector

Examples

Experimental program
Comparison scheme
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specific Embodiment

[0032] Specific examples, such as figure 1 , figure 2 Shown:

[0033] 1. Sample preparation: Prepare cement graded crushed stone specimens (such as 5% cement dosage). Maintain under constant temperature (such as 23°C ± 3°C) conditions.

[0034] 2. Assemble the cement-mixed graded crushed stone drying shrinkage detector.

[0035] 3. Place the cured sample above the load cell with the long side parallel to the horizontal direction. Adjust the dial indicator or displacement sensor so that it is closely attached to the test piece and has a certain amount of pre-compression.

[0036] 4. The data processing device collects test data in real time, automatically calculates the sample quality change, drying shrinkage change, and water loss rate, and automatically sounds or the signal light turns on when the sample shrinkage is judged to be basically stable. Display the test data in real time, and automatically draw the relationship curve between the water loss rate and the strain...

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Abstract

The invention discloses a cement-doped graded broken stone drying shrinkage detector. The detector comprises a base, wherein a support and a weighing sensor are arranged on the base, a cement graded broken stone sample is placed on the weighing sensor, a dial gauge or a displacement sensor is arranged on the support, a detection end of the dial gauge or the displacement sensor points to the cement graded broken stone sample, and the weighing sensor and the dial gauge or the displacement sensor are connected with a data processing device through signal lines. The data processing device is arranged in the base and a displayer is arranged on one side surface of the base. The detector is light, convenient to use and simple to operate, data are accurate and objective, the labor intensity of testers is reduced, the test precision is improved, and the drying shrinkage crack degree of cement-doped graded broken stone packing layers can be predicted through test results.

Description

technical field [0001] The invention relates to a detection device, in particular to a cement-mixed graded crushed stone drying shrinkage detection instrument. Background technique [0002] In order to ensure the strength and durability of the railway subgrade, the surface of the high-speed railway subgrade bed and the transition section are usually filled with cement-mixed graded crushed stone. Since the cement-graded macadam has the characteristics of drying shrinkage and temperature shrinkage, it is easy to cause shrinkage cracks in the cement-graded macadam filling, which affects the quality of the roadbed project. The cracks produced by the drying shrinkage of graded crushed stone mixed with cement are related to the fine particle content, coarse particle size, cement content, water content of the mixture, compaction quality, maintenance measures and environmental conditions of the graded crushed stone. At present, the measure to prevent dry shrinkage cracks in cement-...

Claims

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Application Information

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IPC IPC(8): G01N33/42
Inventor 肖金凤孙嘉良邢亮王治斌顾裕伟
Owner CHINA RAILWAY FIFTH SURVEY & DESIGN INST GRP
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