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A method for determining the content of alkali metal sulfate in Portland cement and clinker

An alkali metal sulfate and Portland cement technology, applied in the measurement of color/spectral characteristics, etc., can solve the problems of low accuracy and lack of accuracy, achieve high test accuracy, reduce adverse effects, and solve the time-consuming and accurate test. low degree of effect

Inactive Publication Date: 2017-08-29
CHONGQING UNIV
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Problems solved by technology

[0006] For the above-mentioned deficiencies that exist in the prior art, the purpose of the present invention is to provide a kind of method for measuring the content of alkali metal sulfate in Portland cement and clinker, solve the prior art to alkali metal sulfate in Portland cement and clinker. Lack of separate testing methods for metal sulfates and low accuracy

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  • A method for determining the content of alkali metal sulfate in Portland cement and clinker
  • A method for determining the content of alkali metal sulfate in Portland cement and clinker

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Embodiment 1: a kind of method (alcohol dissolution method) of the alkali metal sulfate content in measuring portland cement and clinker, comprises the following steps:

[0025] 1) Prepare 50% (v / v) ethanol extract and add 0.5%, 1%, 2% and 3% analytically pure K 2 SO 4 Cement or clinker samples; wherein, the 50% (v / v) ethanol extract is prepared from analytical pure anhydrous ethanol and deionized water at a volume ratio of 1:1.

[0026] 2) Weigh 1g of the above-mentioned cement or clinker samples into a beaker, add 100 mL of the ethanol extract prepared above to dissolve, place on a magnetic stirrer for mechanical stirring, and quickly vacuum filter the mixture after 2 minutes. Take the filtrate in a 300 mL beaker.

[0027] 3) Use a pipette to draw 50 mL of the filtrate into a beaker, place it on a heating plate and heat until the ethanol is completely evaporated. In this step, the heating until the ethanol is completely volatilized is judged by the sense of smell t...

Embodiment 2

[0034] Embodiment 2: For the same cement sample (the cement sample used in the above-mentioned embodiment 1 without internal admixture), two of the three variables of ethanol extract concentration, liquid-solid ratio, and stirring time were fixed respectively, and the analytical purity was controlled. The volume ratio of water ethanol to deionized water is 1:0.5~1:2.0, the liquid-solid ratio is 50:1~250:1, and the stirring time is changed within 2~5 minutes. The following examples are carried out to measure the test results. And calculate the dissolved SO 3 The content (mg / g), the results are shown in Table 1:

[0035] Table 1 Test results under different conditions

[0036]

[0037] As can be seen from the final result of the above table, adopt the numerical value in the ethanol extract concentration of the inventive method, liquid-solid ratio and stirring time change value range, all can accurately and effectively measure the alkali metal sulfate content in the cement, mea...

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Abstract

The invention discloses a method for testing content of alkali metal sulfate in portland cement and clinker. The method comprises the following steps: preparing an ethanol extract that the volume ratio of analytic regent AR of absolute ethyl alcohol to deionized water is (1:0.5) to (1:2.0), dissolving clinker or a cement sample into the prepared ethanol extract according to a liquid-solid ratio of (50-250):1, sufficiently stirring for 2-5 minutes, performing vacuum suction filtration so as to obtain a filtrate, and testing the content of SO3 in the filtrate so as to obtain the content of alkali metal sulfate in the sample through conversion. By adopting the method, the clinker and other components can be effectively prevented from being hydrated in the dissolution process of the portland cement and the clinker, great errors caused by gypsum dissolution can be also avoided, and the method is high in testing accuracy and reliable in result, and has important application values in controlling the content of different sulfates in the cement production process; appropriate water reducing agents and additives according to the content of the alkali metal sulfate used in concrete production can be selected, and the significance of production guidance is great.

Description

technical field [0001] The invention belongs to the technical field of cement concrete production quality control, and in particular relates to a method for determining the content of alkali metal sulfate in Portland cement and clinker. Background technique [0002] Although the total sulfate content in Portland cement is low, there are many types and the sources are relatively complicated. In addition to sulfates from clinker and mixed materials, there are also sulfates introduced from grinding aids added in cement production and externally mixed gypsum. The types mainly include alkali metal sulfates, double salts, mixed salts, and gypsum. Sulfate plays an important role in the hydration and hardening process of cement, and the types and properties of sulfates from different sources are quite different. But at present, the related portland cement standards of all countries are based on SO 3 To calculate and limit the content, the source and type of sulfate are not disting...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31
Inventor 钱觉时杨莎马英倪小琴陈晴
Owner CHONGQING UNIV
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