CN103063802A - Potentiometric titration determination method of cemented sand gravel cement content - Google Patents
Potentiometric titration determination method of cemented sand gravel cement content Download PDFInfo
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Abstract
The invention discloses a potentiometric titration determination method of cemented sand gravel cement content, which comprises the following steps: (1) preparing at least three standard cemented sand gravel/cement mixtures with equal mass and different cement contents; (2) adding water into the standard cemented sand gravel/cement mixtures and diluting to obtain standard mortar mixed liquor; (3) adding a phenolphthalein indicator into clear liquid of the standard mortar mixed liquor, then titrating by using NH4CI aqueous solution till the clear liquid is colorless, recoding the titration quantity of the NH4CI aqueous solution and further obtaining a standard curve between the titration quantity of the NH4CI aqueous solution and the content of cement in the standard cemented sand gravel/cement mixtures; (4) taking the cemented sand gravel/cement mixtures to be detected, adding water and diluting to obtain mortar mixed liquor; and (5) adding the phenolphthalein indicator into clear liquid of the mortar mixed liquor, then titrating by using NH4CI aqueous solution till the clear liquid is colorless to obtain according to the standard curve. The potentiometric titration determination method has the advantages of simplicity in operation, easiness in implementation and short time consumption and is suitable for quickly determining the content of newly-mixed cemented sand gravel cement on site and controlling the construction quality of cemented sand gravel.
Description
Technical field
The present invention relates to a kind of potentiometric titration determination method of cement sand and gravel cement content.
Background technology
Cement sand and gravel be a kind of performance between the novel dam material of concrete and the soil body, channel sand gravel and excavation waste etc. as aggregate, are added the Binder Materials such as entry and a small amount of cement, form through simple mix.Cemented gravel dam is because cement consumption is few, and the hydration heat temperature rise is low, and the aggregate requirement is lower, and working procedure is simple, and cost can significantly reduce.But because cement sand and gravel material water cement content is few, mixing methods is simple, the scene is mixed and stirred rear cement distributing homogeneity and be can not get ensureing, therefore need a kind of good mensuration scheme of weak point simple to operate, consuming time, precision that is applicable to engineering site to come the solidifying sandy gravel cement content of new glue mixing is measured, with the control construction quality.
For normal concrete, the method that detects at present cement content has the phenolphthalein of sprinkling method, EDTA titrimetry, flare photometer and Toni flotation instrument method etc.Yet these methods all can't satisfy the requirement of cement sand and gravel field quick detection cement content.As spray the phenolphthalein method, and be that phenolphthalein is sprayed to the solidifying sandy gravel of new glue mixing, judge the situation of mixing and stirring of cement sand and gravel by the variable color situation of phenolphthalein, can only find out qualitatively where contain cement, well the identification cement content.EDTA titrimetry and for example, ultimate principle is to utilize disodium edta that the solution that contains calcium ion is carried out titration, the calcium ion content that goes out by titration obtains the content of cement, to have high-precision a kind of method, but test procedure is too loaded down with trivial details, influence factor is more, and the necessity NaOH solution in the test belongs to highly basic, and is inconvenient for site test.
Summary of the invention
The potentiometric titration determination method that the purpose of this invention is to provide a kind of cement sand and gravel cement content, this assay method weak point simple to operate, consuming time is suitable for cement sand and gravel cement distributing homogeneity is carried out on-site measurement; By measuring the cement content after cement sand and gravel is mixed and stirred, can guarantee the homogeneity that cement distributes.
The potentiometric titration determination method of a kind of cement sand and gravel cement content provided by the present invention comprises the steps:
Standard cement sand and gravel/the cement mixture of at least 3 kinds of different cement contents that (1) the preparation quality is equal;
(2) add entry in described standard cement sand and gravel/cement mixture and dilute and obtain the standard mortar mixed liquor, the quality of described standard mortar mixed liquor equates;
(3) in the clear liquid of described standard mortar mixed liquor, add phenolphthalein indicator, then use NH
4The Cl aqueous solution is titrated to colourless, records described NH
4The titer of Cl aqueous solution, and then obtain described NH
4Typical curve in the solidifying sandy gravel/cement mixture of the titer of Cl aqueous solution and described standard between the cement content;
(4) get cement sand and gravel/cement mixture to be measured, and add water and dilute and obtain the mortar mixed liquor; Described cement sand and gravel/cement mixture to be measured equates that with the quality of described standard cement sand and gravel/cement mixture described mortar mixed liquor equates with the quality of described standard mortar mixed liquor;
(5) in the clear liquid of described mortar mixed liquor, add described phenolphthalein indicator, then use described NH
4The Cl aqueous solution is titrated to colourless, records described NH
4The titer of Cl aqueous solution is then according to described NH
4Typical curve in the solidifying sandy gravel/cement mixture of the titer of Cl aqueous solution and described standard between the cement content namely gets the cement content in cement sand and gravel/cement mixture to be measured.
In the above-mentioned assay method, cement content in described standard cement sand and gravel/cement mixture can be 1.0 ~ 18%, such as 1.52% ~ 15.84%, 1.48% ~ 15.54%, 1.48%, 1.52%, 2.94%, 3%, 4.34%, 4.44%, 5.72%, 5.85%, 10.88%, 11.10%, 15.54% or 15.84%.
In the above-mentioned assay method, described NH
4The quality percentage composition of Cl aqueous solution can be 5 ~ 15%, such as 10%.
In the above-mentioned assay method, the concentration of described phenolphthalein indicator can be 0.5%.
The invention has the beneficial effects as follows: the present invention can on-the-spotly carry out Fast Measurement to the solidifying sandy gravel cement content of new glue mixing, detects the degree of uniformity that cement distributes in the cement sand and gravel, guarantees the cement sand and gravel construction quality, reduces the potential safety hazard in the work progress.
Description of drawings
Fig. 1 is cement content and NH in solidifying sandy gravel/cement mixture in the embodiment of the invention 1
4Typical curve between the Cl aqueous solution titer.
Embodiment
Employed experimental technique is conventional method if no special instructions among the following embodiment.
Used material, reagent etc. if no special instructions, all can obtain from commercial channels among the following embodiment.
The mensuration of embodiment 1, cement sand and gravel cement content
(1) drafting of bioassay standard curve
Standard cement sand and gravel/the cement mixture (the quality percentage composition is followed successively by 1.52%, 3%, 4.44%, 5.85%, 11.10% and 15.84%) of the different cement contents of preparation 500g; Add 2L water in each standard cement sand and gravel/cement mixture of above-mentioned preparation and dilute and obtain the standard mortar mixed liquor, and fully stir; In the 30g clear liquid of each standard mortar solution obtained above, add phenolphthalein indicator (its concentration is 0.5%), then use NH
4Cl aqueous solution (it is 10% that the quality percentage contains) is titrated to colourless, records this NH
4The Cl aqueous solution is titrated to colourless titer, uses NH
4The titer of Cl aqueous solution obtains typical curve to cement content mapping in the solidifying sandy gravel/cement mixture of various criterion, and resulting typical curve as shown in Figure 1.
The linearly dependent coefficient of the typical curve of drawing is 0.97.
(2) mensuration of cement content in the cement sand and gravel sample to be measured
Get 500g cement sand and gravel/cement mixture to be measured, and add 2L water and dilute and obtain the mortar mixed liquor; In the 30g clear liquid of this mortar mixed liquor, add phenolphthalein indicator (its concentration is 0.5%), so to use NH
4Cl aqueous solution (it is 10% that the quality percentage contains) is titrated to colourless, records this NH
4The titer of Cl aqueous solution; According to NH
4The typical curve that the titer contrast above-mentioned steps (1) of Cl aqueous solution obtains can be determined the content of cement in the testing sample; The accuracy rate of measurement result is 92%.
Can be learnt that by this embodiment engineering site is tested by the cement sand and gravel mixture of choosing different parts, can obtain its cement content with the typical curve contrast, and then can differentiate well the homogeneity that cement distributes in the cement sand and gravel.
The mensuration of embodiment 2, cement sand and gravel cement content
(1) drafting of bioassay standard curve
Standard cement sand and gravel/the cement mixture (the quality percentage composition is followed successively by 1.48%, 2.94%, 4.34%, 5.72%, 10.88% and 15.54%) of the different cement contents of preparation 500g; Add 2L water in each standard cement sand and gravel/cement mixture of above-mentioned preparation and dilute and obtain the standard mortar mixed liquor, and fully stir; In the 30g clear liquid of each standard mortar mixed liquor obtained above, add phenolphthalein indicator (its concentration is 0.5%), then use NH
4Cl aqueous solution (it is 10% that the quality percentage contains) is titrated to colourless, records this NH
4The Cl aqueous solution is titrated to colourless titer, uses NH
4The titer of Cl aqueous solution obtains typical curve to cement content mapping in the solidifying sandy gravel/cement mixture of various criterion, and resulting typical curve and Fig. 1 are similar.
The linearly dependent coefficient of the typical curve of drawing is 0.96.
(2) mensuration of cement content in the cement sand and gravel sample to be measured
Get 500g cement sand and gravel/cement mixture to be measured, and add 2L water and dilute and obtain the mortar mixed liquor; In the 30g clear liquid of this mortar mixed liquor, add phenolphthalein indicator (its concentration is 0.5%), so to use NH
4Cl aqueous solution (it is 10% that the quality percentage contains) is titrated to colourless, records this NH
4The titer of Cl aqueous solution; According to NH
4The typical curve that the titer contrast above-mentioned steps (1) of Cl aqueous solution obtains can be determined the content of cement in the testing sample; The accuracy rate of measurement result is 92%.
Can be learnt that by this embodiment engineering site is tested by the cement sand and gravel mixture of choosing different parts, can obtain its cement content with the typical curve contrast, and then can differentiate well the homogeneity that cement distributes in the cement sand and gravel.
Claims (4)
1. the potentiometric titration determination method of a cement sand and gravel cement content comprises the steps:
Standard cement sand and gravel/the cement mixture of at least 3 kinds of different cement contents that (1) the preparation quality is equal;
(2) add entry in described standard cement sand and gravel/cement mixture and dilute and obtain the standard mortar mixed liquor, the quality of described standard mortar mixed liquor equates;
(3) in the clear liquid of described standard mortar mixed liquor, add phenolphthalein indicator, then use NH
4The Cl aqueous solution is titrated to colourless, records described NH
4The titer of Cl aqueous solution, and then obtain described NH
4Typical curve in the solidifying sandy gravel/cement mixture of the titer of Cl aqueous solution and described standard between the cement content;
(4) get cement sand and gravel/cement mixture to be measured, and add water and dilute and obtain the mortar mixed liquor; Described cement sand and gravel/cement mixture to be measured equates that with the quality of described standard cement sand and gravel/cement mixture described mortar mixed liquor equates with the quality of described standard mortar mixed liquor;
(5) in the clear liquid of described mortar mixed liquor, add described phenolphthalein indicator, then use described NH
4The Cl aqueous solution is titrated to colourless, records described NH
4The titer of Cl aqueous solution is according to described NH
4Typical curve in the solidifying sandy gravel/cement mixture of the titer of Cl aqueous solution and described standard between the cement content namely gets the cement content in cement sand and gravel/cement mixture to be measured.
2. potentiometric titration determination method according to claim 1, it is characterized in that: the cement content in described standard cement sand and gravel/cement mixture is 1.0 ~ 18%.
3. potentiometric titration determination method according to claim 1 and 2 is characterized in that: described NH
4The quality percentage composition of Cl aqueous solution is 5 ~ 15%.
4. each described potentiometric titration determination method according to claim 1-3, it is characterized in that: the concentration of described phenolphthalein indicator is 0.5%.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104634690A (en) * | 2014-09-17 | 2015-05-20 | 四川鑫统领建材科技有限公司 | Method for determining cement content of building mortar |
| CN106770921A (en) * | 2017-01-12 | 2017-05-31 | 长安大学 | The sensing equipment and its method of cement content in a kind of Cement treated material |
| CN107255696A (en) * | 2017-07-24 | 2017-10-17 | 南京林业大学 | The cement content detection method of coring sample after a kind of pre-pouring grout construction |
| CN107621428A (en) * | 2017-09-29 | 2018-01-23 | 中国水利水电第十六工程局有限公司 | Suitable for the binder materials content assaying method of limestone fine aggregate maturing |
| CN107727652A (en) * | 2017-09-28 | 2018-02-23 | 南京林业大学 | A kind of method of cement content after turbidimetry for Determination MJS is reinforced |
| CN110879190A (en) * | 2019-12-04 | 2020-03-13 | 中国水利水电科学研究院 | Portable working degree tester and testing method for working degree of cemented sand gravel |
| CN111852026A (en) * | 2020-07-31 | 2020-10-30 | 华北水利水电大学 | Novel construction process of gelled sand gravel dam |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104634690A (en) * | 2014-09-17 | 2015-05-20 | 四川鑫统领建材科技有限公司 | Method for determining cement content of building mortar |
| CN106770921A (en) * | 2017-01-12 | 2017-05-31 | 长安大学 | The sensing equipment and its method of cement content in a kind of Cement treated material |
| CN107255696A (en) * | 2017-07-24 | 2017-10-17 | 南京林业大学 | The cement content detection method of coring sample after a kind of pre-pouring grout construction |
| CN107727652A (en) * | 2017-09-28 | 2018-02-23 | 南京林业大学 | A kind of method of cement content after turbidimetry for Determination MJS is reinforced |
| CN107727652B (en) * | 2017-09-28 | 2019-12-03 | 南京林业大学 | A kind of method of cement content after turbidimetry for Determination MJS is reinforced |
| CN107621428A (en) * | 2017-09-29 | 2018-01-23 | 中国水利水电第十六工程局有限公司 | Suitable for the binder materials content assaying method of limestone fine aggregate maturing |
| CN107621428B (en) * | 2017-09-29 | 2019-08-20 | 中国水利水电第十六工程局有限公司 | Cementitious material content assaying method suitable for limestone fine aggregate maturing |
| CN110879190A (en) * | 2019-12-04 | 2020-03-13 | 中国水利水电科学研究院 | Portable working degree tester and testing method for working degree of cemented sand gravel |
| CN111852026A (en) * | 2020-07-31 | 2020-10-30 | 华北水利水电大学 | Novel construction process of gelled sand gravel dam |
| CN111852026B (en) * | 2020-07-31 | 2021-12-07 | 华北水利水电大学 | Novel construction process of gelled sand gravel dam |
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