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Method for testing vibration rheological properties of cement mortar

A technology of rheological properties and cement mortar, which is applied in vibration testing, flow characteristics, testing of machine/structural components, etc., can solve problems such as excavating the rheological properties of concrete materials, difficult problems, etc., and achieves wide testing range and easy operation , good reproducibility effect

Pending Publication Date: 2019-12-20
RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI +2
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, most of the currently published testing methods and technologies for the rheological properties of cement mortar focus on the static rheological properties. However, in the actual construction process, it is often necessary to vibrate the mixture to better fill and compact. In the absence of a discussion on the rheological behavior of cement mortar under vibration, it is difficult to dig deep into the rheological properties of concrete materials from the intrinsic point of view, and then guide the practice of its work performance regulation

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  • Method for testing vibration rheological properties of cement mortar
  • Method for testing vibration rheological properties of cement mortar
  • Method for testing vibration rheological properties of cement mortar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Table 1 S-1# cement mortar vibration rheological test parameters

[0021] Sample serial number Test duration (s) Vibration frequency (Hz) Amplitude (mm) S-1# 30 70 ±1

[0022] Table 2 S-1# cement mortar mix ratio

[0023] Sample serial number Cement (g) Fly ash (g) Fine aggregate (g) water-binder ratio Water reducer (g) S-1# 250 / 500 0.45 /

[0024] Set up the test program of the rheometer and the vibration process parameters such as the amplitude and frequency of the frequency conversion vibration equipment, as shown in Table 1. According to the mix ratio in Table 2, cement mortar was prepared, in which the cement was P·II 52.5 cement, the fine aggregate was continuously graded natural river sand with a particle size range of 0.16-5.0 mm, and the water was tap water. The prepared cement mortar sample was quickly loaded into the test cylinder, the test rotor was installed, and the rheometer and frequency conve...

Embodiment 2

[0029] Table 4 S-2# cement mortar vibration rheological test parameters

[0030] Sample serial number Test duration (s) Vibration frequency (Hz) Amplitude (mm) S-2# 30 50 ±1

[0031] Table 5 S-2# cement mortar mix ratio

[0032] Sample serial number Cement (g) Fly ash (g) River sand (g) water-binder ratio Water reducer (g) S-2# 200 50 500 0.45 /

[0033] Set the test program of the rheometer and the vibration process parameters such as the amplitude and frequency of the frequency conversion vibration equipment, as shown in Table 4. According to the mix ratio in Table 5, cement mortar was prepared, in which the cement was P II 52.5 cement, the fine aggregate was continuously graded natural river sand with a particle size range of 0.16-5.0 mm, the fly ash was class I ash, and the water was tap water. The prepared cement mortar sample was quickly loaded into the test cylinder, the test rotor was installed, and the rheome...

Embodiment 3

[0038] Table 7 S-3# cement mortar vibration rheological test parameters

[0039] Sample serial number Test duration (s) Vibration frequency (Hz) Amplitude (mm) S-3# 20 50 ±2

[0040] Table 8 S-3# cement mortar mix ratio

[0041] Sample serial number Cement (g) Fly ash (g) River sand (g) water-binder ratio Water reducer (g) S-3# 250 / 500 0.35 2

[0042] Set the test program of the rheometer and the vibration process parameters such as the amplitude and frequency of the frequency conversion vibration equipment, as shown in Table 7. Prepare cement mortar according to the mix ratio in Table 8, in which the cement is P II 52.5 cement, the fine aggregate is continuously graded natural river sand with a particle size range of 0.16-5.0 mm, the water is tap water, and the water reducer is polycarboxylic acid high-efficiency Superplasticizer, solid content 40%. Quickly put the prepared cement sample into the test cylinder, in...

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Abstract

The invention relates to a method for testing the vibration rheological property of cement mortar. Frequency conversion vibration equipment is combined with a rheometer to test the rheological property of the cement mortar. In the test method, the composition, vibration frequency range and vibration amplitude of the frequency conversion vibration equipment are defined. The rheometer has the characteristics of rotor rotation speed, torque, resolution, and sample volume suitable for evaluation of mortar rheological property. According to the method for testing the vibration and rheological properties of the cement mortar provided by the invention, the matching simulation of the frequency conversion vibration equipment for the vibration compaction process and the advantage of the rheometer inaccurate evaluation of the rheological properties of the cement mortar are combined; based on the practice of compaction of the cement mortar, the rheological behavior of the cement mortar under thevibration state is accurately evaluated; and an important basis is provided for optimization and control of the working performance.

Description

technical field [0001] The invention relates to a method and equipment for testing rheological properties of cement mortar, which belong to the testing technology of vibration rheological properties of cement mortar. Background technique [0002] As the main structural material of modern engineering construction, concrete is the second largest industrial product used in the world's industrial production after aquatic products. The working performance of concrete mixture directly affects the construction process, which in turn has an important impact on the construction schedule and construction cost, and even the mechanical properties and long-term durability of the overall structure. With the continuous expansion of construction demand, various mineral admixtures and chemical admixtures are widely used in concrete, the flow state of concrete mixture is more complicated, and the difficulty of construction performance control is significantly increased. The shape, precision,...

Claims

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Application Information

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IPC IPC(8): G01N11/00G01M7/02
CPCG01N11/00G01M7/02G01N2011/0033
Inventor 蒋睿刘子科谢永江翁智财何龙王月华胡建伟
Owner RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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