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curing method for concrete

A technology for concrete and composition, applied in the field of curing concrete, can solve the problems of difficult to cover with plastic tarpaulin, the roller cannot be easily realized, damage to the exposed side of permeable concrete elements, etc.

Inactive Publication Date: 2017-02-15
LAFARGE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, since the surface of pervious concrete is often irregular, it can be difficult to evenly cover it with plastic tarpaulins
Furthermore, known curing products in the form of emulsions are not suitable for pervious concrete as they tend to flow rapidly through the concrete pores
[0009] Known curing products in the form of waxes are also not suitable for use in pervious concrete as they must be applied using a roller which cannot be easily achieved on the irregular surfaces of pervious concrete
Furthermore, removal of the known cured product is often achieved using stiff brushes, which may damage the exposed side of the pervious concrete element

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0143] Comparative cured compositions were prepared. The solidified composition corresponds to an emulsion of paraffin wax with a dry extract of 15% measured after drying at 160° C. for 30 minutes (comparative example).

[0144] A first cured composition according to the invention is prepared. The first curing composition corresponds to Chitosan 342 containing 2.2% by mass TM Acidified aqueous solution of the product. The first curing composition corresponds to the formulation described in the following table (2):

[0145] Table 2)

[0146]

[0147] A second cured composition according to the invention is prepared. The second curing composition is relative to the formula described in the following table (3):

[0148] table 3)

[0149]

[0150] By mixing water, aqueous hydrochloric acid (HCl, 32%) and Chitosan342 TM product for 30 minutes, the mixture was heated to 50°C to obtain a second cured composition. Then turn off the heat. Then add CHRYSOCure HPE TM Prod...

Embodiment 2

[0156] Permeable concrete was produced according to recipe (1).

[0157] The concrete was poured into three molds to produce three parallelepipedic slabs of permeable concrete with a length of 30 cm, a width of 20 cm and a height of 8 cm.

[0158] For each slab, measure the mass m of the corresponding mold 0 and measure the mass m of the mold filled with fresh concrete 1 .

[0159] No curing treatment was performed on the first slab.

[0160] The second slab is cured by covering the visible sides of the concrete with a plastic tarpaulin. Mass of plastic tarpaulin deposited on fresh concrete, m 2 for 30g.

[0161] Curing of the third slab was performed by spraying the curing composition on the visible side of the concrete. Curing composition corresponds to 50% CHRYSOCure HPE TM Mixing of the blend and 50% of an aqueous solution containing 3.3% by mass of chitosan acidified with hydrochloric acid. The dry extract in the cured composition (measured after drying at 160°C f...

Embodiment 3

[0166] Permeable concrete was produced according to recipe (1).

[0167] The concrete was poured into six molds to produce three parallelepipedic slabs of permeable concrete with a length of 30 cm, a width of 20 cm and a height of 8 cm.

[0168] For each slab, measure the mass m of the corresponding mold 0 and measure the mass m of the mold filled with fresh concrete 1 .

[0169] No curing treatment was performed on the first slab.

[0170] The second slab is cured by covering the visible sides of the concrete with a plastic tarpaulin. Weight of plastic tarpaulin deposited on fresh concrete (m) 2 It is 16g.

[0171] Curing of the third slab was performed by spraying the curing composition on the visible side of the concrete. Curing composition corresponds to CHRYSOCure HPE TM Diluted aqueous solution of the blend. The dry extract of the cured composition (measured after drying at 160°C for 30 minutes) was 15%.

[0172] In production containing diluted CHRYSOCure HPE ...

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Abstract

The present invention relates to a curing method for concrete elements, said method comprising at least partially coating said elements with a curing composition comprising a solvent and a thickener, said thickener being greater than (12 ) is insoluble at a pH and is soluble in the solvent within a pH solubility range having an upper limit less than (11).

Description

technical field [0001] The present invention relates to a curing method for concrete. Background technique [0002] The chemical hydration of cement requires sufficient water and temperature conditions to provide concrete with the desired compressive strength and durability properties. During the pouring of exposed concrete, unfavorable climatic conditions can contribute to the rapid loss of water, for example on the exposed surface of a slab. Consequently, the hydration reaction may be incomplete and the concrete element may be less resistant to wearing and abrasion. [0003] The curing process of concrete is one that is capable of retaining sufficient levels of humidity and / or temperature for a given period of time. The curing thus consists of protecting the concrete from the loss of moisture from the time it is poured until it sets and during the first stages of hardening (usually several days). [0004] For this purpose, the curing method may include the use of barrie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/63C04B40/04
CPCC04B41/009C04B41/4803C04B41/63C04B40/04C04B28/02C04B41/4578
Inventor C·克里斯蒂德F·佩雷O·瓦特
Owner LAFARGE SA