Method for determining composition of pore fluid of sulphoaluminate cement hardening slurry

A technology of sulfoaluminate cement and pore liquid, applied in the direction of removing certain components in weighing, measuring devices, instruments, etc., can solve problems such as gaps and ion concentration drop, achieve good repeatability and avoid high-pressure operation , to avoid the effect of ion concentration drop

Inactive Publication Date: 2018-10-02
ZHEJIANG UNIV
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Problems solved by technology

However, due to the introduction of additional water during the experiment, the concentration of each ion in the solution decreased, and there was still a gap between the test results of the pore fluid and the real situation.

Method used

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  • Method for determining composition of pore fluid of sulphoaluminate cement hardening slurry

Examples

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Embodiment Construction

[0028] The following examples take the 42.5 grade quick-hardening sulfoaluminate cement produced by a company in Shandong as an example, and the following steps are used to determine the composition of the cement pore fluid:

[0029] 1) Sample preparation: add water to sulphoaluminate cement at a water-binder ratio of 0.5, stir in a slurry mixer for 2 minutes, and prepare a 40×40×160mm specimen according to the standard. Remove the mold after 6 hours, seal it with a plastic bag and place it in the standard maintenance until the specified age.

[0030] 2) Determination of free water content: cut off one-third from the test piece, weigh its weight W 1 After that, it is quickly crushed and placed in an oven, and dried at 60°C to a constant weight W 2 . Then the free water content w is: w=(W 1 -W 2 ) / W 1 ×100%.

[0031] 3) Liquid phase extraction: crush the remaining test pieces with a pressure testing machine, and further grind and pulverize them with a mortar. Pass the po...

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Abstract

The invention relates to the field of cement material development and analytical chemistry, and aims to provide a method for determining the composition of a pore fluid of a sulphoaluminate cement hardening slurry. The method includes the steps: preparing a clean slurry sample according to the standard of the water-binder ratio of 0.5, and curing to the specified age; taking a part of the sample to calculate the content of free water; crushing and grinding the remaining sample, and allowing to pass through a 80 [mu]m sieve; taking the sieved powder and mixing with deionized water; carrying outcentrifuging separation after high-speed stirring, and extracting an upper extract liquid; and diluting the extract liquid with a nitric acid solution, analyzing the concentrations of elements with an ion chromatograph, correcting, and recording the result as the concentration Ce of the pore fluid; and correcting the concentration data, and converting to obtain the data of the ion concentrationsCp of all the elements under conditions of the actual free water content. The conventional chemical analysis equipment is adopted, high pressure operation is avoided, and the method is simple and easyto operate and good in repeatability; the pore fluid is suitable for different cementitious materials and water-binder ratios, and can obtain the composition of the pore fluid of cement-based materials under various conditions, and truly reduces the internal pore composition of cement.

Description

technical field [0001] The invention relates to a method for determining the pore liquid composition of hardened slurry of sulfoaluminate cement, which belongs to the field of research and development of cement materials and also belongs to the field of analytical chemistry. Background technique [0002] The formation of passivation film in concrete is based on pore fluid of cement-based materials, so the characteristics of pore fluid are crucial to the quality of passivation film of steel bar, which has become the focus of research on the durability of reinforced concrete structures. [0003] The pore fluid of commonly used Portland cement-based materials mainly contains Ca 2+ , Na + , K + ,OH - and SO 4 2- , the impact on the passivation of steel bars is mainly manifested in the alkalinity and ion composition of the pore fluid. According to the research results of Poursaee et al., it takes 3 days to form a stable passivation film on the steel surface in the simulated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/04G01N30/02
CPCG01N5/045G01N30/02
Inventor 徐强王凌波詹树林唐旭东樊先平杨辉钱匡亮
Owner ZHEJIANG UNIV
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