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A kind of ettringite stabilizer

A technology of stabilizer and ettringite, which is applied in the field of powdery substances, can solve the problems such as the unsatisfactory effect of the stabilizer, and achieve the effects of significant stabilization, convenient transportation and use, and improved performance and durability

Active Publication Date: 2021-01-19
YANTAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Judging from the published information, the active ingredient of the ettringite stabilizer is mainly calcium carbonate, but it has been found through experiments that the stabilizer effect of the above components is not very ideal

Method used

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  • A kind of ettringite stabilizer
  • A kind of ettringite stabilizer
  • A kind of ettringite stabilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1) Crush carbonate (the main component is calcium carbonate, which can be minerals such as limestone or dolomite) and grind it in a ball mill to obtain finely ground carbonate powder;

[0044] 2) Add calcium nitrate and sodium nitrite powder to the above-mentioned finely ground carbonate powder in sequence, where calcium nitrate: sodium nitrite: finely ground carbonate powder (mass ratio) = 20:10:70, and mix Evenly, the ettringite stabilizer is obtained;

[0045] 3) Add the ettringite stabilizer according to 0% and 6% of the mass of sulfoaluminate cement (42.5), use a 40mm×40mm×160mm triple mold, use standard consistency to clean the slurry with water, and remove it after 1 day mold, standard maintenance. After the age is set, the middle part of the sample is taken, and the sample is immediately hydrated with a sufficient amount of absolute ethanol for use in XRD experiments and chemical analysis.

[0046] in,

[0047] In step 1), the fineness of the ground carbonate...

Embodiment 2

[0053] 1) Crush carbonate (the main component is calcium carbonate, which can be minerals such as limestone or dolomite) and grind it in a ball mill to obtain finely ground carbonate powder;

[0054] 2) Add calcium nitrate and sodium nitrite powder to the above-mentioned finely ground carbonate powder in sequence, among which calcium nitrate:

[0055] Sodium nitrite: finely ground carbonate powder (mass ratio) = 30:0:70, and mix well to prepare ettringite stabilizer;

[0056] 3) Add the ettringite stabilizer according to 0% and 3% of the mass of sulfoaluminate cement (42.5), use a 40mm×40mm×160mm triple mold, use standard consistency to clean the slurry with water, and remove it after 1 day mold, standard maintenance. After the age is set, the middle part of the sample is taken, and the sample is immediately hydrated with a sufficient amount of absolute ethanol for use in XRD experiments and chemical analysis.

[0057] in,

[0058] In step 1), the fineness of the ground carbo...

Embodiment 3

[0063] Embodiment 3 (comparative example)

[0064] Add analytically pure calcium carbonate powder according to 0% and 10% of the mass of sulphoaluminate cement (42.5), use a 40mm×40mm×160mm triple mold, use standard consistency water to clean the slurry, and demould after 1 day, the standard maintenance. After the age is set, the middle part of the sample is taken, and the sample is immediately hydrated with a sufficient amount of absolute ethanol for use in XRD experiments. Add 0% and 10% calcium carbonate powder, and the numbers of the clean slurry are system 5 and system 6 respectively.

[0065] Hydration products at 28 days of age such as Image 6 As shown, it can be seen that after adding 10% calcium carbonate powder, the diffraction peaks of ettringite not only did not increase, but decreased. This shows that the stabilizing effect of calcium carbonate on ettringite is relatively limited, and the main reason for the decrease may be that calcium carbonate dilutes the c...

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Abstract

The invention relates to an ettringite stabilizer. The ettringite stabilizer is prepared from, in percentage by mass, 20%-30% of calcium nitrate, 0-10% of sodium nitrite, 0-2% of inevitable impuritiesand the balance of carbonate. The ettringite stabilizer is technically characterized in that common concrete production raw materials or chemical reagents are used and mixed uniformly. The ettringitestabilizer can effectively improve the stability of ettringite in a hardened cement-based material, so that the performance and the durability of the material are notably improved, and the ettringitestabilizer is applicable to Portland cement, sulphoaluminate cement and other gelling systems capable of producing ettringite through hydration. The final commercial form of the ettringite stabilizeris powder, and the ettringite stabilizer is convenient to store and transport.

Description

technical field [0001] The invention relates to a functional powdery substance, in particular to an ettringite stabilizer. Background technique [0002] Eettite (that is, calcium sulfoaluminate trisulfide hydrate) is a hydration product formed during the hydration and hardening of cement. Its role in concrete is very important and has multiple aspects. The main functions include adjusting the setting time, providing early strength and having a certain expansion effect. [0003] The content of ettringite is relatively high in cement hydration products, so after the ettringite is generated, its stability is very important. However, ettringite is not a stable phase in the hydration system of cement-based materials. When the gypsum is exhausted, ettringite will be converted into monosulfide calcium sulfoaluminate hydrate, and monosulfide calcium sulfoaluminate hydrate is difficult to achieve. The role of ettringite. [0004] After searching relevant literature in the CNKI dat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/10
CPCC04B40/0039C04B22/085C04B22/10
Inventor 宋远明王志娟王波周少龙
Owner YANTAI UNIV