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A method for judging the failure of Portland cement through microscopic detection

A Portland cement, micro-detection technology, applied in measurement devices, material analysis using measurement of secondary emissions, instruments, etc., to achieve the effect of solving many factors affecting performance

Active Publication Date: 2019-07-23
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for judging the failure of Portland cement through microscopic detection, and solve the technical problem that there is no technical problem in the prior art that the failure of Portland cement can be accurately characterized by observing the microstructure of the surface of Portland cement particles

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  • A method for judging the failure of Portland cement through microscopic detection
  • A method for judging the failure of Portland cement through microscopic detection
  • A method for judging the failure of Portland cement through microscopic detection

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Embodiment 1

[0045] Such as figure 1 As shown, adopt the present invention to carry out failure detection to a batch of Portland cement, comprise following method step:

[0046] Step 1, making cement testing samples.

[0047] 1.1), quantitatively weigh 4 groups of 25g cement powder to be tested. The cement to be tested is PII 52.5 Portland cement produced by Nanjing Jiangnan-Onoda Cement Co., Ltd., which is controlled by the national standard GB175-2007. The chemical composition of the cement raw materials in the cement factory report is shown in Table 1. The test results of other project parameters As shown in table 2.

[0048] Store the PII 52.5 Portland cement in bags that have just left the factory at room temperature 25°C above the potassium chloride solution prepared in a closed plastic container, and the relative humidity in the container is 84.3±0.3%. After curing for 7d, 14d, 30d, and 90d, take 25g of cement powder to make samples of four groups A, B, C, and D at different ages...

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PUM

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Abstract

The invention discloses a method for judging silicate cement failure by microcosmic detection. The method includes the steps: making cement detection samples; observing the cement detection samples by the aid of a scanning electron microscope to obtain a BSE image, and qualitatively representing complete failure of the batch of cement if needle-like morphology crystal structures lager than 4mum gather near cement particles in the BSE image; performing EDS energy spectrum analysis for a BSE image area if needle-like morphology crystal structures smaller than 4mum are in the BSE image or a suspected needle crystals cannot be observed. Failure representation of the cement is achieved by the aid of microcosmic detection means, the method conveniently and accurately represents whether the cement stored at any moment and in any environments is ineffective or not, the quality of the cement is timely known, and theoretical basis is provided for prediction and improvement of use performance of the cement and application of the cement to engineering.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for judging the failure of Portland cement through microscopic detection. Background technique [0002] Portland cement is a powdery material with strong water absorption. According to the GB175-2007 "General Portland Cement" standard, the cement must not be damp and mixed with debris during transportation and storage, but the shelf life of the cement is not clearly specified. The main consideration is the obvious impact of the cement storage environment on the quality of cement. It is generally believed that the validity period of cement storage is 13 months, but after about 3 months of storage in a humid environment, it is prone to agglomeration and other phenomena, and clinker minerals undergo partial hydration reactions, which affects the degree of cement bonding, resulting in quality decline and then failure. . [0003] Changes in the qualit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/2251
CPCG01N23/22G01N2223/62G01N2223/635
Inventor 吴胜兴孙克纬赵海涛娄保东张风臣朱杰
Owner HOHAI UNIV
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