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 c

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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Example Embodiment

[0060] Example 1

[0061] 1) Sample: Plain concrete test block prepared with 525 type composite Portland cement produced by Shenzhen Haixing Onoda Cement Co., Ltd. in a steel mold (specification: 4cm*4cm*4cm), the mix ratio is: water-cement ratio 0.4, Fly ash 0.6, slag 0.1, cured for 120 days in a standard environment, and two samples were taken for contact angle measurement.

[0062] 2) Sample surface treatment: first use a pre-grinding machine to polish the surface of two samples with 500 mesh, 1000 mesh, and 2000 mesh sandpaper. Each sample is polished on each specification of sandpaper at a set speed of 550r / min for 5 minutes; then use Microfiber dust-free cloth (manufacturer: Shenzhen Honglian Purification Technology Co., Ltd., model: 4009-6, specification: 15cm*15cm) wipe the polished surface, clean the surface ash and other tiny impurities; finally place the sample The pure water is fully infiltrated to exhaust the air in the sample pores.

[0063] 3) Test: Use a surface ten...

Example Embodiment

[0076] Example 2

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

[0078] 2) Sample surface treatment: first use a pre-grinding machine to polish the surface of 4 samples with 500 mesh, 1000 mesh, and 2000 mesh sandpaper. Each sample is polished on sandpaper of each specification at a set speed of 550r / min for 5 minutes; then Microfiber dust-free cloth (manufacturer: Shenzhen Honglian Purification Technology Co., Ltd., model: 4009-6, specification: 15cm*15cm) wipe the polished surface, clean the surface ash and other tiny impurities; finally place the sample The pure water is fully infiltrated to exhaust the air in the sample pores.

[0079] 3) Test: Use a surface tension met...

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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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