Detection method of early autogenous shrinkage of cement mortar

A technology of cement mortar and detection method, which is applied in the direction of material inspection products, etc., to achieve the effects of improving accuracy, easy-to-obtain test equipment, and simple test equipment

Inactive Publication Date: 2011-10-26
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of detecting early self-shrinkage of cement mortar at present, and provide an accurate, simple and practical detection method for early self-shrinkage of cement mortar

Method used

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  • Detection method of early autogenous shrinkage of cement mortar
  • Detection method of early autogenous shrinkage of cement mortar
  • Detection method of early autogenous shrinkage of cement mortar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 1 As shown, the detection device is composed of a graduated dropper 1, a bottle stopper 2 and an Erlenmeyer flask 3, and the bottle stopper 2 and the well-sealed Erlenmeyer flask 3 form a whole. A graduated dropper 1 forms a tight connection with the bottle stopper 2 of the Erlenmeyer flask, and forms a sealed system with the Erlenmeyer flask 3 . First, thoroughly clean the device, dry it and check the tightness, and soak the inside of the device with oil before use. Mix cement mortar according to the mixing ratio in Table 1, weigh 100g of the prepared cement mortar, put it into a conical flask with a capacity of 100mL, a wall thickness of 1mm, and glass material, and fill it up with oil to ensure that there are no air bubbles in the bottle. After corking the cork, add the oil level of the graduated dropper with a maximum volume of 1mL to the 0 mark. Read the reading of the scale tube at this time and record the time, and place it at a temperature of 2...

Embodiment 2

[0030] The test method is consistent with that of Example 1, the difference from Example 1 is that the mixing ratio of cement mortar is different, the fly ash is replaced with silica fume, and a water reducer is added. For example Table 2, the quality of the cement mortar tested in this example is 250g, and this device with a capacity of 200mL and a wall thickness of 5mm is used, and the sample is cured at a temperature of 20°C to 25°C. Test data such as image 3 .

[0031] Numbering

[0032] *% of mass of cementitious material

Embodiment 3

[0034] The difference from Example 1 is that the mix ratio of cement mortar is different. By trying to prepare more mortars with low water-cement ratio, the influence of different water-cement ratios on the early self-shrinkage of cement mortar is studied. With example image 3 . In this example, the quality of the cement mortar detected is 500g, and the device with a capacity of 500mL and a wall thickness of 3mm is cast iron. The maximum measuring range of the graduated dropper is 10mL, and the sample is placed at a temperature of 20°C to 25°C. maintenance. Test data such as Figure 4 .

[0035] Numbering

[0036] *% of mass of cementitious material.

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Abstract

The invention belongs to the technical field of building material detection, particularly relates to a detection method of early autogenous shrinkage of cement mortar, and solves the problem of the testing of early autogenous shrinkage of cement mortar. The size of the autogenous shrinkage of cement mortar at an early stage is reflected mainly by directly measuring the volume change of the cement mortar over time. By using the method, the autogenous shrinkage of the cement mortar at an early stage can be measured accurately, and the method is also applicable to the measurement of early autogenous shrinkage of cement purified pulp. The invention is applicable to practical production and scientific research.

Description

technical field [0001] The invention belongs to the technical field of building material detection, and in particular relates to a detection method for early self-shrinkage of cement mortar. It is suitable for testing the autogenous shrinkage of cement mortar caused by cement hydration and internal drying in the early stage. Background technique [0002] With the vigorous development of the national economy and the continuous growth of the construction industry, cement mortar is more and more widely used in the field of construction technology. The application of cement mortar in practice has brought many obstacles. Self-shrinkage refers to the fact that under the condition of no dehydration to the outside, the internal cement hydration continues, and the free water in the capillary pores is insufficient, so that the internal relative humidity of the slurry decreases spontaneously, causing the internal capillary tension to increase and form internal stress. Mortar shrinks ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/38
Inventor 孙振平郑琨鹏刘警杨辉
Owner TONGJI UNIV
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