Method for improving strength and durability of cement-based materials by medium and low frequency vibration

A cement-based material, low-frequency vibration technology, applied in the field of building materials, can solve problems such as short vibration time, and achieve the effects of increasing compressive strength, reducing porosity, and shortening setting time.

Inactive Publication Date: 2017-09-01
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, some people use the vibration method to improve the concrete strength, but the vibration method is generally used, the purpose is to discharge the air bubbles inside the concrete, achieve a compact effect, and play a role in smoothing the surface. The vibration time is very short and stops before the initial setting of the concrete. vibration

Method used

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  • Method for improving strength and durability of cement-based materials by medium and low frequency vibration
  • Method for improving strength and durability of cement-based materials by medium and low frequency vibration
  • Method for improving strength and durability of cement-based materials by medium and low frequency vibration

Examples

Experimental program
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Effect test

Embodiment 1

[0016] A method for modifying the strength and durability of cement-based materials by medium and low frequency vibrations, the steps are as follows:

[0017] Put ordinary Portland cement, water, first-grade fly ash, S95 mineral powder, and polycarboxylate superplasticizer into a mixer in a mass ratio of 100:60:67:12:1, and stir slowly for 2 minutes, then Stir quickly for 2 minutes to obtain concrete slurry; place a 40mm (length) × 40mm (width) × 160mm (height) 3-unit steel mold on a four-dimensional space vibration table, and after pouring the concrete slurry in the mold, set the four-dimensional The vibration frequency of the space vibrating table is 100Hz (200Hz), the vibration amplitude is 1.5mm (1mm), and the vibration time is 2 hours. The sample was used as the comparative experimental group (1-1). The experimental performance results are shown in Table 1:

[0018] Table 1

[0019]

[0020] It can be seen from Table 1 that, for 1d strength, the strength of the uppe...

Embodiment 2

[0022] A method for modifying the strength and durability of cement-based materials by medium and low frequency vibrations, the steps are as follows:

[0023] Put ordinary Portland cement, water, first-grade fly ash, S95 mineral powder, and polycarboxylate superplasticizer into a mixer in a mass ratio of 100:60:67:12:1, and stir slowly for 2 minutes, then Stir quickly for 2 minutes to obtain concrete slurry; place a 40mm (length) × 40mm (width) × 160mm (height) 3-unit steel mold on a four-dimensional space vibration table, and after pouring the concrete slurry in the mold, set the four-dimensional The vibration frequency of the space vibration table is 100Hz, the vibration amplitude is 1.5mm, and the vibration time is 2 hours and 3 hours respectively. The vibration table is started to simulate the vibration test, and the sample of 40mm×40mm×160mm is prepared under the static condition as Compare the experimental group (2-1). The experimental performance results are shown in T...

Embodiment 3

[0028] A method for modifying the strength and durability of cement-based materials by medium and low frequency vibrations, the steps are as follows:

[0029] Put ordinary Portland cement, water, first-grade fly ash, S95 mineral powder, and polycarboxylate superplasticizer into a mixer in a mass ratio of 100:50:50:15:1, and stir slowly for 2 minutes, then Stir quickly for 2 minutes to obtain concrete slurry; place a 40mm (length) × 40mm (width) × 160mm (height) 3-unit steel mold on a four-dimensional space vibration table, and after pouring the concrete slurry in the mold, set the four-dimensional The vibration frequency of the space vibration table is 100Hz, the vibration amplitude is 1.5mm, and the vibration time is 2 hours and 3 hours respectively. The vibration table is started to simulate the vibration test, and the sample of 40mm×40mm×160mm is prepared under the static condition as Compare the experimental group (3-1). The experimental performance results are shown in T...

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Abstract

The invention relates to a method for improving strength and durability of cement-based materials by medium and low frequency vibration. The method comprises the following steps: putting stirred concrete in a four-dimensional space vibrating table, carrying out medium and low frequency vibration treatment till being hardened and formed, thus obtaining the cement-based materials. According to the invention, the medium and low frequency vibration is used for accelerating C3S which is taken as a main mineral in cement to generate a chemical reaction, Ca(OH)2 and C-S-H nucleuses begin to form, the ion concentration of Ca<2+> reaches a supersaturated state, and then vibration occurs to promote C3S to generate a hydration reaction with water so as to shorten the induction period of the cement, furthermore, the deposition and adsorption of hydration products and cement mineral particles are partly destroyed through the vibration to increase the contact area of C-S-H gel and a surrounding water body so as to promote early hydration of the cement, and further increase the hydration efficiency of C-S-H, and then the effects of improving the cement early strength, reducing the cement porosity and increasing the cement compactness are reached.

Description

technical field [0001] The invention belongs to the technical field of building materials and relates to a method for modifying the strength and durability of cement-based materials by medium and low frequency vibrations. Background technique [0002] Concrete is the largest man-made material of our time and one of the most important building materials. According to forecasts, it will still be the most important building material in the 21st century. At present, concrete structures have replaced other structures in many fields and become the dominant structure in all countries in the world. With the continuous development of the construction industry, the proportion of concrete structures in civil construction projects will become larger and larger, and higher requirements are placed on the quality of concrete, especially in terms of strength and durability of concrete. [0003] There is a close dependence between the mechanical properties and durability of concrete and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B40/00
CPCC04B28/04C04B40/0067C04B2201/50C04B18/08C04B14/02C04B2103/302
Inventor 王桂明魏洋孙涛水中和凌刚
Owner WUHAN UNIV OF TECH
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