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CN-121994560-A - Method for rapidly testing pozzolanic activity of pozzolanic material

CN121994560ACN 121994560 ACN121994560 ACN 121994560ACN-121994560-A

Abstract

The invention belongs to the technical field of cement, and discloses a method for rapidly testing the pozzolanic activity of a pozzolanic material, which comprises the following steps of preparing a simulated pore solution of cement paste; step two, respectively adding samples of a plurality of types of pozzolanic materials into corresponding simulated pore solutions for dispersion to obtain corresponding sample suspensions, step three, quantitatively taking the sample suspensions of the samples for Zeta potential test, step four, fitting the Zeta potential of the samples and corresponding intensity activity indexes to obtain a fitting curve, step five, taking the Zeta potential of the samples to be tested, testing the Zeta potential of the samples to be tested according to the procedures from step one to step three, and determining the intensity activity indexes of the samples to be tested based on the fitting curve. The invention realizes quick and simple test, greatly reduces the detection time and is not easy to be interfered by human factors.

Inventors

  • Mu Fanyuan
  • HU QINGSONG
  • MA MING
  • LIU ZHIYUAN
  • YANG RUI
  • Xiao Yinwen
  • LI GUANGLIANG

Assignees

  • 安徽海螺集团有限责任公司
  • 安徽海螺产业技术研究院有限公司

Dates

Publication Date
20260508
Application Date
20260129

Claims (8)

  1. 1. A method for rapidly testing pozzolanic activity of a pozzolanic material, comprising: step one, preparing a simulated pore solution of cement paste; step two, respectively adding samples of a plurality of types of pozzolanic materials into corresponding simulated pore solutions for dispersion to obtain corresponding sample suspension; quantitatively taking sample suspensions of all samples to perform Zeta potential test; fitting Zeta potential and corresponding intensity activity indexes of each sample to obtain a fitting curve; And fifthly, taking the sample to be tested, testing the Zeta potential of the sample to be tested according to the procedures from the first step to the third step, and determining the intensity activity index of the sample to be tested based on the fitting curve.
  2. 2. The method of claim 1, wherein the pozzolanic material used for the fitting comprises slag powder, fly ash, silica fume, coal gangue, pumice, and incineration sludge, and the strength-activity index of 28 d is measured in step four by using a national standard calculation method of strength-activity index.
  3. 3. The method of claim 2, wherein in step one, the simulated pore solution comprises calcium sulfate dihydrate, potassium sulfate, potassium hydroxide and water.
  4. 4. A method for rapid determination of pozzolanic material pozzolanic activity according to claim 1, wherein in step two, the simulated pore solution added to the pozzolanic material sample is sonicated.
  5. 5. The method of claim 1, wherein in the second step, 1 part each of the pozzolanic materials is fitted, 100 parts each of the simulated pore solution is used, the sonication time is 2.5 min, and in the third step, the amount of each sample suspension used is1 mL.
  6. 6. The method of claim 5, wherein in step three, the Zeta potential test is performed at a constant temperature of 25 ℃ and the test is restarted after the constant temperature of 1 min of the suspension is equilibrated after the suspension is injected into the measuring cell.
  7. 7. A method for rapid determination of pozzolanic material pozzolanic activity according to claim 6, wherein the Zeta potential test for the fitted sample and the test sample is repeated 3 times for each sample, and the arithmetic mean of the results is taken as the final result.
  8. 8. The method according to claim 4, wherein in the first step, 1.72 parts of calcium sulfate dihydrate, 6.96 parts of sodium sulfate, 4.75 parts of potassium sulfate and 7.12 parts of potassium hydroxide are sequentially taken and dissolved in 1000 parts of deionized water to prepare the simulated pore solution of the cement slurry.

Description

Method for rapidly testing pozzolanic activity of pozzolanic material Technical Field The invention belongs to the technical field of cement, and particularly relates to a method for rapidly testing the pozzolanic activity of a pozzolanic material. Background Pozzolanic materials are siliceous or/and aluminous materials which have no or only weak gelling properties per se, but which, after milling, can react chemically with Ca (OH) 2 at ambient temperature to form a gelled product, as long as moisture is present. The use proportion of the cement clinker can be reduced by utilizing the pozzolanic material, waste disposal, resource saving, energy saving and carbonization preparation of the cementing material are realized, and the cement is beneficial to improving the durability such as impermeability, chemical resistance and the like on the premise of ensuring the mechanical property of the concrete. The proportion of pozzolanic material to replace cement depends on the pozzolanic activity of the pozzolanic material. Currently, the pozzolan activity detection methods specified in the national standard pozzolanic materials for cement (GB/T2847-2005) and natural pozzolanic materials for cement mortar and concrete (JC/T315-2011) are a lime absorption value method and an intensity activity index method. The lime absorption value method has complicated test operation and is easy to be interfered by human factors, and the intensity activity index method has simple operation and can directly reflect the intensity contribution of the pozzolanic material to the gelling system. Therefore, the intensity activity index method is the most commonly used method for evaluating the properties of pozzolanic materials. However, the test period of the intensity activity index method is long, and the requirement of rapidly testing the volcanic ash activity cannot be met. Therefore, how to test the pozzolanic activity of the pozzolanic material rapidly, simply and reliably becomes a technical problem to be solved. Disclosure of Invention The invention aims to provide a method for rapidly testing the volcanic ash activity of a volcanic ash material, so as to solve the technical problem of long testing period in the prior art. The method for rapidly testing the pozzolanic activity of the pozzolanic material comprises the following steps: step one, preparing a simulated pore solution of cement paste; step two, respectively adding samples of a plurality of types of pozzolanic materials into corresponding simulated pore solutions for dispersion to obtain corresponding sample suspension; quantitatively taking sample suspensions of all samples to perform Zeta potential test; fitting Zeta potential and corresponding intensity activity indexes of each sample to obtain a fitting curve; And fifthly, taking the sample to be tested, testing the Zeta potential of the sample to be tested according to the procedures from the first step to the third step, and determining the intensity activity index of the sample to be tested based on the fitting curve. Preferably, the pozzolanic materials used for fitting comprise slag powder, fly ash, silica fume, coal gangue, pumice and incineration sludge ash, and in the fourth step, the 28 d intensity activity index used for fitting is measured by adopting a national standard calculation method of intensity activity index. Preferably, in step one, the simulated pore solution comprises calcium sulfate dihydrate, potassium sulfate, potassium hydroxide and water. Preferably, in step two, the simulated void solution to which the pozzolanic material sample was added is sonicated. Preferably, in step two, 1 part each of the pozzolanic materials used for fitting is used, 100 parts of the simulated pore solution is used, the sonication time is 2.5 min, and in step three, the amount of each sample suspension used is 1 mL. Preferably, in step three, the Zeta potential test is performed at a constant temperature of 25 ℃ and the test is restarted after a constant temperature equilibration of 1 min after the suspension is injected into the measuring cell. Preferably, the Zeta potential test for each sample is repeated 3 times for the fitted sample and the sample to be tested, taking the arithmetic mean of the measured results as the final result. Preferably, in the first step, 1.72 parts of calcium sulfate dihydrate, 6.96 parts of sodium sulfate, 4.75 parts of potassium sulfate and 7.12 parts of potassium hydroxide are sequentially taken and dissolved in 1000 parts of deionized water to prepare a simulated pore solution of the cement paste. Compared with the existing lime absorption value method and intensity activity index method, the method has the technical advantages that the method is used for testing the intensity activity index of each sample for fitting in the earlier stage of determining the fitting curve, and the method is used for testing the intensity activity index of the existing technology which takes longe