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A method for measuring the air content of hardened concrete

A technology of concrete and air content, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of hardened concrete without research

Active Publication Date: 2015-08-26
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As we all know, the freeze-thaw damage of concrete is closely related to the air content of concrete. At present, the determination of the air content of concrete in China is only limited to the measurement of the air content of freshly mixed concrete, and no research has been done on the air content of hardened concrete. In order to solve this problem, the air content of hardened concrete is determined by combining the AutoporeIII9420 high-pressure mercury porosimeter with the mathematical push-down formula.

Method used

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  • A method for measuring the air content of hardened concrete
  • A method for measuring the air content of hardened concrete
  • A method for measuring the air content of hardened concrete

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Embodiment Construction

[0021] Guangxi China Resources Cement was used to prepare concrete with medium sand (river sand) provided by Beijing Fuwei Commercial Center as fine aggregate and mountain stone as coarse aggregate.

[0022] Sample preparation

[0023] (1) Prepare a group of concrete samples, the size of the test block is 10cm×10cm×10cm, every 3 samples are a group, and the samples are obtained after 28 days of curing in a standard curing box.

[0024] (2) Dry the cured concrete sample in a drying oven at 105-110°C to constant weight, and measure its mass as M 0 , put the concrete into the melted wax until its surface is covered with paraffin, take it out after the paraffin solidifies, and weigh its mass M 1 , and then use the drainage method to measure the volume V of the surface-wrapped paraffin concrete 0 .

[0025] (3) Strip off the paraffin on the concrete surface, make the surface clear and clean, crush it with a jaw crusher, take 3 to 5 mortar samples with the size of soybean particl...

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Abstract

The invention relates to a method for determining gas content in hardened concrete, belonging to the technical field of building material testing. Some research has been done in the field of determination of gas content in fresh concrete in China at present, but the determination method of gas content in hardened concrete is still a blank. A volumetric method and a pressure method have been provided for determining gas content of fresh concrete in China, and related equipment has been invented and produced for effective determination; and however, no effective testing method for determining gas content of hardened concrete is provided. The invention provides a method combining a boroscope and a mathematic derivation formula; and the method can quickly and accurately determine gas content in hardened concrete, and has important meanings for predicting freezing resistance of hardened concrete in cold areas.

Description

1. Technical field [0001] The invention belongs to the technical field of building material testing. Specifically, it is a method for measuring the air content of hardened concrete. The method is scientific in principle, simple and convenient to test, and can accurately measure the air content of hardened concrete. 2. Background technology [0002] Concrete material has the characteristics of low price, convenient construction and strong bearing capacity. It has been widely used in engineering construction and is the most used building material. In recent decades, accidents of premature structural failure due to poor durability of concrete have occurred frequently at home and abroad. In cold regions, freeze-thaw cycle damage is the main form of concrete structure damage. Our country's concrete structure not only has the phenomenon of freeze-thaw damage to concrete structures in the "Three North" regions, but also in the relatively mild climate, but still freezes in winter ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N5/00
Inventor 李悦董万国杨进波童欢郭伟刘雄飞施同飞谢丹妮
Owner BEIJING UNIV OF TECH
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