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Shrinkage-reducing agent for hydraulic material

一种水硬性材料、减缩剂的技术，应用在水硬性材料用减缩剂领域，能够解决耐冻融性劣化、升高、妨碍水硬性材料用减缩剂市场普及等问题，达到优异耐冻融性、抑制强度降低的效果

Inactive Publication Date: 2012-09-26
NIPPON SHOKUBAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these shrinkage reducers for hydraulic materials need to be combined with other mixed materials such as powder resins and expansion agents, which cannot solve the problem of rising concrete costs
[0008] In addition, hardened products using any of these shrinkage reducing agents for hydraulic materials have a problem that freeze-thaw resistance is significantly deteriorated
Therefore, it is difficult to use the shrinkage reducing agent for hydraulic materials in cold regions, so this significantly hinders the market popularization of the shrinkage reducing agent for hydraulic materials

Method used

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  • Shrinkage-reducing agent for hydraulic material

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0110] "2. Preparation of shrinkage reducing agent for hydraulic materials"

[0111] The shrinkage reducing agent for hydraulic materials of this invention can be manufactured using arbitrary appropriate methods. For example, polyoxyalkylene compound (A) can be used as an essential component, and if necessary, it can be mixed with water reducer (B), AE agent (C), defoamer (D), polyoxyalkyl ether ( E), at least one of the pH adjuster and any other components are mixed by any appropriate method. The order of mixing can be in any suitable order.

[0112] The shrinkage reducing agent for hydraulic materials of the present invention has both excellent shrinkage reducing function and excellent freeze-thaw resistance. Since the shrinkage reducing agent for hydraulic materials of the present invention contains a polyoxyalkylene compound (A) at a high concentration, the polyoxyalkylene compound (A) has excellent stability over time, so separation and precipitation do not occur and th...

Embodiment

[0125] Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited to these examples. It should be noted that, unless otherwise specified, "parts" and "%" in the examples are based on weight.

[0126] "GPC Molecular Weight Determination Conditions"

[0127] Column used: TSKguardcolumn SWXL+TSKgelG4000SWXL+G3000SWXL+G2000SWXL manufactured by TOSOH

[0128] Eluent: 115.6 g of sodium acetate trihydrate was dissolved in a mixed solvent of 10999 g of water and 6001 g of acetonitrile, and the pH was further adjusted to 6.0 with 30% aqueous sodium hydroxide solution, and the resulting eluent solution was used.

[0129] Injection volume: 100 μL 0.5% eluent solution

[0130] Eluent flow rate: 0.8mL / min

[0131] Column temperature: 40°C

[0132] Standard substance: polyethylene glycol, weight average molecular weight (Mw) 272500, 219300, 85000, 46000, 24000, 12600, 4250, 7100, 1470.

[0133] Calibration curve orde...

Embodiment A-1～ Embodiment A-3

[0232] "Example A-1 to Example A-3, Comparative Example A-1"

[0233] (mix)

[0234] With the mixing ratio shown in Table 2, each material was measured so that the kneading amount would be 30 L, and the material was kneaded using a disc mixer. In addition, regarding cement, ordinary Portland cement (specific gravity 3.16) manufactured by Pacific Cement Co., Sumitomo Osaka Cement Co., Ltd., and Ube Mitsubishi Cement Co., Ltd. was mixed equally and used. A mixture of Kakegawa land sand and Kimitsu land sand at a weight ratio of Kakegawa land sand / Kitsu land sand = 80 / 20 was used as fine aggregate, and Ome hard sandstone was used as coarse aggregate.

[0235] [Table 2]

[0236]

[0237] (mixing of materials)

[0238] Put the coarse aggregate and half of the fine aggregate used into the mixer, stop the rotation after 5 seconds of dry mixing, and put in cement and the remaining fine aggregate. After a further 5 seconds of dry mixing, stop the rotation again, add water contai...

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Abstract

Provided is a shrinkage-reducing agent for a hydraulic material, which does not require a combination with any other admixture, is inexpensive, and is capable of suppressing a reduction in strength of a hardened concrete material, suppressing generation of a crack in a hardened concrete material by virtue of its excellent shrinkage-reducing ability, and imparting excellent freeze-thaw resistance. The shrinkage-reducing agent for a hydraulic material includes at least one kind of polyoxyalkylene compound (A) as an essential component, in which a concrete or a mortar produced by using the shrinkage-reducing agent for a hydraulic material has a spacing factor of 350 [mu]m or less.

Description

technical field [0001] The present invention relates to a shrinkage reducing agent for hydraulic materials. Specifically, the present invention relates to a shrinkage reducing agent for hydraulic materials capable of imparting an excellent shrinkage reducing function and excellent freeze-thaw resistance. Background technique [0002] The hydraulic material provides a cured product excellent in strength, durability, and the like. Therefore, hydraulic materials are widely used as cement compositions such as cement paste, mortar, and concrete. Hydraulic materials are indispensable materials for civil engineering and building structures. [0003] After the hydraulic material is hardened, depending on the ambient temperature, humidity conditions, etc., it may cause the loss of unreacted moisture remaining inside. Therefore, drying shrinkage occurs, cracks occur in cured products, and strength and durability decrease. Decreases in the strength and durability of civil engineeri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/32C04B24/02C04B24/16C04B24/18C04B24/26C08L71/02C04B103/30C04B103/50C04B103/60
CPCC04B2111/29C04B28/02C04B2111/34C04B2103/58C08L71/02C04B40/0039C04B24/32C04B2103/304C04B2103/306C04B2103/50C04B24/08C04B24/16C04B24/226
Inventor 正长真理福原广二
Owner NIPPON SHOKUBAI CO LTD
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