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Method for measuring contact angle and surface energy of cement-based material

A technology of cement-based material and measurement method, applied in the field of civil engineering, can solve the problems of affecting the stability of the contact angle, difficult to judge the surface properties, change of the time of the contact angle measurement, etc., so as to achieve the effect of overcoming unfavorable factors and avoiding adverse effects.

Inactive Publication Date: 2014-06-11
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a problem of evaporation when the liquid is exposed to the air. When the volume of the droplet is small, the evaporation amount becomes considerable. The droplet volume reduction caused by this phenomenon directly affects the stability of the contact angle, causing the contact angle to change within the measurement time. change, it is difficult to judge which value can be used to characterize the surface properties of the sample
In addition, the surface properties of samples prepared by centrifugation are very different from those of cement-based materials poured in engineering practice. The surface properties of samples obtained in experiments cannot be directly used to evaluate the surface properties of cement-based materials in actual engineering, especially the wettability.

Method used

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  • Method for measuring contact angle and surface energy of cement-based material
  • Method for measuring contact angle and surface energy of cement-based material
  • Method for measuring contact angle and surface energy of cement-based material

Examples

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Embodiment 1

[0061] 1) Sample: a plain concrete test block prepared in a steel mold (specification: 4cm*4cm*4cm) with 525 composite portland cement produced by Shenzhen Haixing Onoda Cement Co., Ltd., the mix ratio is: water-cement ratio 0.4, Fly ash 0.6, slag 0.1, 120d curing under standard environment, take 2 samples for contact angle measurement.

[0062] 2) Sample surface treatment: Firstly, use a pre-grinder to grind the surface of two samples with 500 mesh, 1000 mesh, and 2000 mesh sandpaper in sequence, and each sample is polished for 5 minutes on each specification of sandpaper at a set speed of 550r / min; then use Microfiber dust-free cloth (manufacturer: Shenzhen Honglian Purification Technology Co., Ltd., model: 4009-6, specification: 15cm*15cm) to wipe the polished surface, clean the surface dust and other tiny impurities; finally put the sample in Fully infiltrate in pure water to expel the air in the pores of the sample.

[0063] 3) Test: Measure the contact angle of sample-p...

Embodiment 2

[0077] 1) Sample: a plain concrete test block prepared in a steel mold (specification: 4cm*4cm*4cm) with 525 composite portland cement produced by Shenzhen Haixing Onoda Cement Co., Ltd., the mix ratio is: water-cement ratio 0.4, Fly ash 0.2, slag 0.3, 120d curing under standard environment, 4 samples were taken for contact angle measurement.

[0078] 2) Surface treatment of the sample: First, use a pre-grinder to grind the surface of 4 samples with 500 mesh, 1000 mesh, and 2000 mesh sandpaper in sequence, and each sample is polished for 5 minutes on each specification of sandpaper at a set speed of 550r / min; then use Microfiber dust-free cloth (manufacturer: Shenzhen Honglian Purification Technology Co., Ltd., model: 4009-6, specification: 15cm*15cm) to wipe the polished surface, clean the surface dust and other tiny impurities; finally put the sample in Fully infiltrate in pure water to expel the air in the pores of the sample.

[0079] 3) Test: Measure the contact angle of...

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Abstract

The invention discloses a method for measuring a contact angle and surface energy of a cement-based material. The method comprises the following steps: A, processing a surface of a sample; B, providing an instrument, a reagent and a test environment; C, measuring the contact angle; and D, calculating surface energy of the sample through a formula, namely immersing a test surface of a test concrete sample in water, slowly releasing nonpolar droplets from the lower part of the surface by using an injector, attaching the nonpolar droplets on the surface of the sample, measuring the contact angle by using a video optical contact angle measuring instrument, and calculating the surface energy of the cement-based material by using a derived formula.

Description

technical field [0001] The invention belongs to the technical field of civil engineering and relates to a method for measuring the contact angle and surface energy of cement-based materials. Background technique [0002] Concrete is widely used in modern civil engineering structures and is the most extensive building material and structural material. Due to the composition of the structure itself and the characteristics of its bearing capacity, during its service period, as the hydration process continues, its strength is slowly increasing; but at the same time, the concrete is subject to erosion and damage from the external environment and various factors, such as Corrosion, carbonization, freeze-thaw damage, alkali-aggregate reaction, and sulfate corrosion of steel bars will gradually weaken and reduce their strength. Due to the huge economic losses caused by the lack of durability of reinforced concrete, countries such as the United Kingdom, the United States, and Japan ...

Claims

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Application Information

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IPC IPC(8): G01N13/00G01N1/32
Inventor 董必钦邢锋杨略陈镇鸿房国豪张健超徐伟伟王琰帅
Owner SHENZHEN UNIV
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