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Cement admixture, cement composition and method for laying same, and method for producing cement hardened product

一种水泥外加剂、水泥组合物的技术，应用在扣件、服饰、应用等方向，能够解决混凝土流动性变差、泵负荷高、没有彻底解决流动性随时间的下降等问题

Inactive Publication Date: 2009-09-23
NIPPON SHOKUBAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, these techniques do not thoroughly address the decrease in fluidity over time, that is, "slump loss", and therefore, there is still room for improvement in the workability of cement compositions during construction by making the cement compositions sufficiently fluid. further research is required
And in the range of high water-reducing rate required for high-strength concrete, the fluidity of concrete becomes poor, especially, the viscosity increases under high-shear conditions, so that when pumping, the pump load becomes extremely high, making it difficult to pump deliver

Method used

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  • Cement admixture, cement composition and method for laying same, and method for producing cement hardened product
  • Cement admixture, cement composition and method for laying same, and method for producing cement hardened product
  • Cement admixture, cement composition and method for laying same, and method for producing cement hardened product

Examples

Experimental program
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Effect test

Embodiment approach

[0148] (1) Take the cement admixture of the present invention and the alkylene oxide defoamer as a combination of two essential components. Usable as alkylene oxide defoamers are polyoxyalkylene, polyoxyalkylene alkyl ether, polyoxyalkylene acetyl ether, and polyoxyalkylene alkylamine. Among them, polyoxyalkylene alkylamine is particularly preferred. The ratio of the alkylene oxide defoamer is preferably 0.01% by mass to 20% by mass of the cement admixture .

[0149] (2) Use the cement admixture of the present invention and the anti-segregation agent as a combination of two essential components. Various thickeners that can be used as anti-material segregation agents, such as nonionic cellulose ethers, and compounds containing hydrophobic substituents as part of the structure, etc., said hydrophobic substituents containing hydrocarbons with 4-30 carbon atoms Chain and polyoxyalkylene chain, the polyoxyalkylene chain is obtained by adding 2 to 300 moles of alkylene oxide of 2 t...

Embodiment

[0157] Hereinafter, the present invention will be explained in more detail by way of examples. However, it must be noted that the present invention is not limited to these embodiments. In the examples, unless otherwise specified, "parts" means "parts by mass", and "%" means "% by mass".

[0158] In the preparation example, the following conditions were used to determine the yield of (poly)alkylene glycol obtained as a by-product when the unsaturated polyalkylene glycol ether monomer (a) was prepared.

[0159]

[0160] Equipment: Shimadzu's product, LC-10

[0161] Detector: Differential refractive index (RI) detector (HITACHI 3350 RI MOMTOR) (product of Hitachi)

[0162] Eluent: Type: deionized water

[0163] Flow rate: 1.5ml / min (ml / min)

[0164] Column: Type: Showa Denko's product, Shodex GF-310 (4.6×300mm)

[0165] Temperature: 40℃

[0166]In the preparation example, the conversion rate of each raw material monomer and the weight average molecular weight of the obtained ...

preparation example 1

[0183] Into a stainless steel high-pressure reactor equipped with a thermometer, a stirrer, and an introduction tube for nitrogen and alkylene oxides, 196 parts of methallyl alcohol (2-methyl-2-propene-1-ol) as an unsaturated alcohol and 3.1 parts of hydroxide were added Sodium acts as a catalyst for the addition reaction. Purge the reactor with nitrogen while stirring, and then heat to 150°C in a nitrogen atmosphere. Under safe pressure, maintaining the temperature at 150°C, 6310 parts of ethylene oxide were introduced into the reactor. Maintain the temperature at 150°C until the alkylene oxide addition reaction is completed, thereby driving the reaction to completion. The resulting reaction product (hereinafter referred to as "M-1") contains the by-product polyalkylene glycol (polyethylene glycol) and unsaturated polyalkylene glycol ether monomer (hereinafter referred to as "MAL-50") The unsaturated polyalkylene glycol ether monomer is derived from methallyl alcohol by adding 50...

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Abstract

The cement admixture of the present invention has the ability to reduce viscosity, and also has high dispersion ability and ability to prevent slump loss even in the range of high water reducing rate. The above-mentioned cement admixture comprises copolymer (A), specific unsaturated (poly) alkylene glycol ether monomer (a) and non-polymerizable (poly) alkylene glycol (B) tri A component, the copolymer (A) contains a structural unit (I) derived from an unsaturated (poly) alkylene glycol ether monomer (a) and a structural unit derived from a maleic acid monomer (b) (II), the cement admixture also contains specific additives.

Description

Technical field [0001] The invention relates to a cement admixture, a cement composition and a construction (laying) method thereof and a method for producing a cement hardened product. Background technique [0002] Since the cement composition can produce cement-hardened products with excellent strength and durability, it has been widely used for exterior wall materials and building components. Examples of such a cement composition include a cement slurry prepared by adding water to cement, a mortar prepared by mixing sand fine aggregate into the cement slurry, and concrete prepared by mixing gravel coarse aggregate into the mortar. Generally, cement admixtures are added in order to improve air entrainment and fluidity. In recent years, people have increased their awareness of the importance of admixtures and made technological innovations to them. [0003] The function of the cement admixture is to ensure sufficient dispersibility of the cement composition even if the moisture ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/26C04B28/02C08F290/06C08F22/02C08F22/10C04B40/00C08F283/06C08F290/14C08L71/02
CPCC08F290/14Y10T24/1303Y10T24/3493C08L71/02C04B28/02C04B2103/32C04B40/0039Y10T24/3495C08F283/065C08F290/142C08F283/06C04B24/06C04B24/22C04B24/267C04B24/32C04B24/38C04B2103/12C08F222/06C08L2666/04C04B24/26
Inventor 山下明彦田中宏道宇野亨恩田义幸
Owner NIPPON SHOKUBAI CO LTD