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Cement expansive material with harmonious coordinated development of expansion rate and concrete strength

A concrete and expansive agent technology, applied in the field of concrete expansive agent, can solve the problems of not being able to adapt to the development of concrete strength, insufficient compensation for shrinkage, low expansion rate, etc., to improve crack resistance and waterproof ability, low production cost, and stable expansion performance Effect

Active Publication Date: 2014-12-10
GUILIN HUAYUE ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, expansion agents have been widely used as compensation for shrinkage, but there are still deficiencies in the composite expansion agents on the market: ①The expansion rate is low; ②The alkali content is high; development fit

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh various raw materials that meet the requirements according to the ratio;

[0031] First, add 3kg of magnesium fluorosilicate to 20kg of fly ash, start the forced mixer, stir for 5-8 minutes to make it evenly mixed, then start the mixer, add 45kg of gypsum powder, 10kg of quicklime powder, 20kg of Sulphoaluminate clinker and 2kg calcium lignosulfonate; continue stirring for 40min. Stir well. Finally, it is packed in a woven bag with a liner plastic bag, which is the finished product.

[0032] The main technical performance of the product:

[0033] Appearance: powdery material;

[0034] Fineness: 1.18mm sieve residual value≦0.35%;

[0035] Specific gravity: 2.6±0.2g / ml

[0036] Setting time: initial setting≧45min, final setting≦300min.

[0037] Compressive strength (28d): ≥45MPa

[0038] Limit expansion rate: ﹥0.03%.

Embodiment 2

[0040] Weigh various raw materials that meet the requirements according to the ratio;

[0041] First, add 7kg sodium dihydrogen phosphate to 29kg fly ash, start the forced mixer, stir for 5-8 minutes to mix evenly, then start the mixer, add 48kg gypsum powder, 14kg quicklime powder, 24kg Sulphoaluminate clinker and 1.5kg sodium gluconate; continue stirring for 40min. Stir well. Finally, it is packed in a woven bag with a liner plastic bag, which is the finished product.

[0042] The main technical performance of the product:

[0043] Appearance: Powder Material:

[0044] Fineness: 1.18mm sieve residual value≦0.35%;

[0045] Specific gravity: 2.6±0.2g / ml

[0046] Setting time: initial setting≧45min, final setting≦300min.

[0047] Compressive strength (28d): ≥45MPa

[0048] Limit expansion rate: ﹥0.03%.

Embodiment 3

[0050] Weigh various raw materials that meet the requirements according to the ratio;

[0051] First, add 3kg of sodium silicate to 12kg of fly ash, start the forced mixer, stir for 5-8 minutes to make it evenly mixed, then start the mixer, add 40kg of gypsum powder, 6kg of quicklime powder, and 18kg of sulfur in sequence after an interval of 1-2min. Aluminate clinker and 3kg zinc sulfate; continue stirring for 40min. Stir well. Finally, it is packed in a woven bag with a liner plastic bag, which is the finished product.

[0052] The main technical performance of the product:

[0053] Appearance: Powder Material:

[0054] Fineness: 1.18mm sieve residual value≦0.35%;

[0055] Specific gravity: 2.6±0.2g / ml

[0056] Setting time: initial setting≧45min, final setting≦300min.

[0057] Compressive strength (28d): ≥45MPa

[0058] Limit expansion rate: ﹥0.03%.

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Abstract

The invention relates to a cement expansive material with harmonious coordinated development of expansion rate and concrete strength, which is prepared from the following raw materials in parts by weight: 40-50 parts of gypsum powder, 16-25 parts of sulfoaluminate clinker, 5-15 parts of quicklime powder, 10-30 parts of fly ash, 2-8 parts of inorganic additive and 1-5 parts of inorganic retarder. The product has the advantages of simple preparation technique, no need of calcining or stirring and lower production cost, and can save abundant energies; and the early expansion character development is quick, and the medium-later expansion development is stable, so the expansion rate can be coordinated with the development of the concrete strength.

Description

technical field [0001] The invention relates to concrete, in particular to a concrete expansion agent whose expansion rate is coordinated with the strength development of the concrete. Background technique [0002] Concrete will shrink in volume at the initial stage of setting or during hardening, and shrinkage stress will be generated inside the structure. When the stress exceeds the tensile strength of concrete, it will cause the concrete to crack and form shrinkage cracks. [0003] In order to prevent and alleviate the temperature shrinkage cracks of super-long concrete structures, it is a routine measure to effectively install the post-cast belt, but the post-cast belt prolongs the construction period, and the lapping, welding and cleaning of the broken steel bars all bring certain troubles to the joint filling construction. Good will leave hidden dangers. [0004] Therefore, it is necessary to use the expansion effect of shrinkage-compensating concrete in the hardening...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06C04B22/14C04B18/08C04B22/06
CPCY02W30/91
Inventor 尹丹王恒黄煌陈威阮长泰
Owner GUILIN HUAYUE ENVIRONMENTAL PROTECTION TECH CO LTD
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