JP6611163B2 - Method for producing cement composition - Google Patents

Method for producing cement composition Download PDF

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JP6611163B2
JP6611163B2 JP2015170535A JP2015170535A JP6611163B2 JP 6611163 B2 JP6611163 B2 JP 6611163B2 JP 2015170535 A JP2015170535 A JP 2015170535A JP 2015170535 A JP2015170535 A JP 2015170535A JP 6611163 B2 JP6611163 B2 JP 6611163B2
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cement composition
cement
aggregate
water
mixture
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JP2017047550A (en
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隆人 野崎
康秀 肥後
彰徳 杉山
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太平洋セメント株式会社
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Description

  The present invention relates to a method for producing a cement composition.
As a general method for producing a cement composition such as mortar or concrete, there is a method in which after mixing powder materials such as cement and aggregate, water is added to the obtained mixture and kneaded.
On the other hand, it is also known to manufacture a cement composition by a method different from a general manufacturing method (a method in which the order of mixing materials is different). For example, in Patent Document 1, a large amount of mineral fine powder is mixed as a method for obtaining a cement composition having more excellent physical properties by adjusting the order of materials input when producing a cement composition. In the method for producing concrete, a step of kneading aggregate and primary water in advance, a step of mixing cement, a step of mixing fine mineral powder, and a step of adding and kneading the remaining water (secondary water) There is described a method for producing concrete, comprising: According to this manufacturing method, the bleeding characteristics can be improved and the strength of the concrete after hardening can be improved as compared with the conventional kneading according to the material charging sequence.
JP-A-10-272618
  An object of the present invention is to provide a production method capable of obtaining a cement composition (lightweight mortar or lightweight concrete) with an increased amount of air.
As a result of diligent studies to solve the above problems, the present inventor puts cement into an aggregate-containing mixture composed of water, aggregate, and an admixture for introducing air, and kneads the cement. It has been found that the above object can be achieved by the method for producing a cement composition for obtaining the composition, and the present invention has been completed.
That is, the present invention provides the following [1] to [4].
[1] It includes a cement composition preparation step of adding cement to an aggregate-containing mixture composed of water, aggregate, and an admixture for introducing air to obtain a cement composition. A method for producing a cement composition.
[2] The cement composition according to [1], wherein the admixture for introducing air is at least one selected from an AE agent, an AE water reducing agent, a high performance AE water reducing agent, a foaming agent, and a foaming agent. Manufacturing method.
[3] The above cement composition does not contain powder materials other than cement, or contains powder materials other than cement, and contains powder materials other than cement. The method for producing a cement composition according to any one of [1] or [2], wherein, in the cement composition preparation step, the other powder material is added to the aggregate-containing mixture.
[4] Prior to the cement composition preparation step, the water, the aggregate, and an admixture for introducing the air are mixed to obtain an aggregate-containing mixture preparation step for obtaining the aggregate-containing mixture. The manufacturing method of the cement composition in any one of said [1]-[3] containing.
According to the method for producing a cement composition of the present invention, a cement composition (light mortar or lightweight concrete) with an increased amount of air can be obtained.
The cement composition obtained by the present invention can be used, for example, as a material for a floor slab of a middle-rise or high-rise building, and in this case, the resistance to earthquakes can be improved.
The method for producing a cement composition according to the present invention includes a cement composition obtained by adding cement to an aggregate-containing mixture composed of water, aggregate, and an admixture for introducing air to obtain a cement composition. Product preparation step.
This will be described in detail below.
[Cement composition preparation process]
This step is a step for obtaining a cement composition by adding cement to an aggregate-containing mixture composed of water, an aggregate, and an admixture for introducing air.
As water, tap water, industrial water, or the like can be used.
The blending amount of water is not particularly limited, and may be a general blending amount in a cement composition such as mortar or concrete. For example, the blending amount of water is determined to be 60% or less (preferably 20 to 55%) as a mass ratio (water / total binder) of water and cement and other powder materials (total binder). Just do it.
Aggregates include only fine aggregates or a combination of fine aggregates and coarse aggregates.
Examples of the fine aggregate include river sand, mountain sand, land sand, sea sand, crushed sand, quartz sand, artificial lightweight fine aggregate, or a mixture thereof.
Examples of the coarse aggregate include river gravel, mountain gravel, land gravel, crushed stone, artificial lightweight coarse aggregate, heavy aggregate, recycled aggregate, or a mixture thereof.
The unit amount of the aggregate (mixing amount per 1 m 3 of the cement composition) is not particularly limited, and is a general unit amount (for example, 500 to 2,000 kg / m) in the cement composition such as mortar and concrete. 3 ).
The admixture for introducing air is not particularly limited as long as it can introduce air into the cement composition. For example, AE agent, AE water reducing agent, high performance AE water reducing agent, A foaming agent, a foaming agent, etc. are mentioned. These may be used individually by 1 type and may be used in combination of 2 or more type.
Especially, it is preferable to use any one or both of AE agent and a foaming agent from a viewpoint of enlarging the air quantity of the cement composition obtained. Examples of preferred embodiments in the present invention include, for example, a combination of an AE water reducing agent and an AE agent, or a combination of an AE water reducing agent and a foaming agent.
The amount of the admixture varies depending on the type of admixture, but is usually 0.001 to 5 parts by mass with respect to 100 parts by mass of the total amount of cement and other powder materials (total amount of binder). It is.
The cement is not particularly limited. Ecocement can be used.
In this step, other powder materials can be used together with cement. Examples of powder materials other than cement (binders other than cement) include blast furnace slag fine powder, fly ash, and limestone powder. The proportion of cement in the total binder is not particularly limited, but is usually 30% by mass or more.
[Aggregate-containing mixture preparation process]
This step is a step provided before the cement composition preparation step, in which water, aggregate, and an admixture for introducing air are mixed to obtain an aggregate-containing mixture.
Here, the mixing method of water, aggregate, and admixture is not particularly limited, and water, aggregate, and admixture may be charged together into a mixer and mixed, or After mixing the admixture, the aggregate may be added to the resulting mixture and mixed.
The mixing time is preferably 30 seconds or more, more preferably 40 to 360 seconds, still more preferably 60 to 300 seconds, and particularly preferably 80 to 240 seconds. If the time is 30 seconds or more, a sufficient amount of air is introduced into the aggregate-containing mixture, and the amount of air in the resulting cement composition can be increased. If the time is 360 seconds or less, the time required for production can be shortened.
In the present invention, the mixer used for kneading (mixing) each material is not particularly limited, and a conventional mixer such as a pan-type mixer or a biaxial mixer can be used.
Moreover, you may use various additives, such as a water reducing agent and a shrinkage reducing agent, as needed within the range which does not inhibit the objective of this invention.
Various additives may be added at any point in the production method of the present invention.
The cement composition obtained by the production method of the present invention is a general production method of a cement composition (specifically, after mixing cement and a granular material such as aggregate, the obtained mixture and water are mixed. Compared with the cement composition obtained by the kneading method), the amount of air is large.
In addition, the amount of air in the cement composition obtained by the production method of the present invention is a value immediately after kneading from the viewpoint of the object of the present invention (increase in the amount of air), preferably 15% by volume or more, more preferably 16 volumes. % Or more, more preferably 17% by volume or more, and particularly preferably 18% by volume or more. The upper limit of the amount of air is a value immediately after kneading from the viewpoint of the compressive strength of the cement composition, and is preferably 20% by volume or less.
EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.
[Materials used]
(1) Cement: Ordinary Portland cement, manufactured by Taiheiyo Cement (2) Fine aggregate: Artificial lightweight aggregate (absolutely dry density: 1.51 g / cm 3 ), Taiheiyo Cement, trade name “Pacific Asanolite”
(3) AE water reducing agent: manufactured by BASF Japan, trade name “Master Polyhide 15S”
(4) Foaming agent: BASF Japan, trade name “Fine Foam 707”
(5) AE agent: BASF Japan, trade name “Master Air 303A”
(6) Water: Tap water
[Example 1]
Into a 5 liter Hobart mixer (manufactured by Hobart), water, an AE water reducing agent, and a foaming agent were added and mixed, and then the fine aggregate was added to the resulting admixture-containing water and kneaded for 90 seconds. Thus, an aggregate-containing mixture was obtained. Next, cement was added to the aggregate-containing mixture and kneaded for 30 seconds, and then the kneaded material adhering to the side wall in the mixer was scraped off and further kneaded for 60 seconds to produce a mortar. The kneading was always performed at a low speed.
The blending amount of each material was determined so that the amount of mortar obtained was 1.5 liters and the amount shown in the blending 1 of Table 1.
[Example 2]
Mortar was produced in the same manner as in Example 1 except that the kneading time of the admixture-containing water and the fine aggregate was changed from 90 seconds to 180 seconds.
[Example 3]
Mortar was produced in the same manner as in Example 2, except that the AE agent was used instead of the foaming agent, and the amount of each material was determined to be the amount shown in Formulation 2 of Table 1.
[Comparative Example 1]
Into the above Hobart mixer (manufactured by Hobart), water, an AE water reducing agent, and a foaming agent were added and mixed, and then cement was added and kneaded for 30 seconds. Next, the fine aggregate was put into the kneaded material and kneaded for 30 seconds, and then the kneaded material adhering to the side wall in the mixer was scraped off and further kneaded for 60 seconds to produce a mortar.
The blending amount of each material was determined so that the amount of mortar obtained was 1.5 liters and the ratio (unit amount) shown in Table 1.
In addition, the manufacturing method of the mortar in the comparative example 1 is the method performed based on "JISR5201 (physical test method of cement)" except having performed kneading | mixing always at low speed.
The amount of air of each mortar obtained (value immediately after kneading, 15 minutes after the end of kneading, and 30 minutes after the end of kneading) is “JIS A 1116: 2005 (unit volume mass test of fresh concrete”). Method and test method based on mass of air amount (mass method)) ”. In addition, as a container used for this test method, the thing prescribed | regulated to the "test machine instrument" of the "unit volume mass test" of "JIS A 1171: 2000 (the test method of a polymer cement mortar)" was used.
The results are shown in Table 2.
  From Table 2, the cement compositions (Examples 1 to 3) obtained by the production method of the present invention were compared with the cement composition obtained by the production method of Comparative Example 1 (general production method). It can be seen that the amount is large and lightweight.

Claims (5)

  1. And water, and aggregate, the aggregate-containing mixture comprising admixture for introducing air into the cement composition, the cement was charged and kneaded, saw including a cement composition preparation step of obtaining a cement composition The method for producing a cement composition, wherein the admixture is a combination of an AE water reducing agent and an AE agent, or a combination of a high performance AE water reducing agent and an AE agent .
  2. The method for producing a cement composition according to claim 1, wherein the amount of air immediately after kneading the cement composition is 15 to 20% by volume.
  3.   The cement composition contains no powder material other than cement, or contains a powder material other than cement, and includes the powder material other than cement. The method for producing a cement composition according to claim 1 or 2, wherein in the cement composition preparation step, the other powder material is added to the aggregate-containing mixture.
  4.   An aggregate-containing mixture preparation step of mixing the water, the aggregate, and an admixture for introducing the air to obtain the aggregate-containing mixture before the cement composition preparation step. The manufacturing method of the cement composition of any one of 1-3.
  5. The method for producing a cement composition according to claim 4, wherein in the aggregate-containing mixture preparation step, each material is mixed for 30 to 360 seconds.
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Publication number Priority date Publication date Assignee Title
JPH0535649B2 (en) * 1988-09-06 1993-05-27 Taisei Corp
JPH0747514B2 (en) * 1991-02-08 1995-05-24 鐘淵化学工業株式会社 Lightweight cured product manufacturing method
JPH0564807A (en) * 1991-03-30 1993-03-19 Sekisui Chem Co Ltd Manufacture of fiber reinforced hydraulic inorganic composition and manufacture of compact
JP3974970B2 (en) * 1997-03-28 2007-09-12 太平洋セメント株式会社 Concrete production method
JPH11246253A (en) * 1998-03-05 1999-09-14 Taisei Corp Lightweight concrete
JP2000234350A (en) * 1999-02-15 2000-08-29 Yoshio Tomoda Construction method for mortar work
JP2002166412A (en) * 2000-11-30 2002-06-11 Sekisui Chem Co Ltd Method for manufacturing woody cement board
JP2003191224A (en) * 2001-12-25 2003-07-08 Ohbayashi Corp Method and apparatus for producing ready-mixed concrete
JP4118873B2 (en) * 2004-12-24 2008-07-16 有限会社 サンブレン Concrete production method and concrete production standardization system

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