JPH0558688A - Placing of mortal-concrete - Google Patents

Placing of mortal-concrete

Info

Publication number
JPH0558688A
JPH0558688A JP3246521A JP24652191A JPH0558688A JP H0558688 A JPH0558688 A JP H0558688A JP 3246521 A JP3246521 A JP 3246521A JP 24652191 A JP24652191 A JP 24652191A JP H0558688 A JPH0558688 A JP H0558688A
Authority
JP
Japan
Prior art keywords
aggregate
concrete
mortar
sieve
ratio
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP3246521A
Other languages
Japanese (ja)
Other versions
JP2853403B2 (en
Inventor
Atsushi Nakane
淳 中根
Shogo Kubota
昌吾 久保田
Yuji Saito
裕司 斉藤
Kenichi Ichinose
賢一 一瀬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Obayashi Corp
Original Assignee
Obayashi Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Obayashi Corp filed Critical Obayashi Corp
Priority to JP3246521A priority Critical patent/JP2853403B2/en
Publication of JPH0558688A publication Critical patent/JPH0558688A/en
Application granted granted Critical
Publication of JP2853403B2 publication Critical patent/JP2853403B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

PURPOSE:To improve the workability in the placing of an ultrahigh strength mortar-concrete by adjusting the particle size distribution of the aggregate. CONSTITUTION:Aggregate composed mainly of corundum (alpha-Al2O3) is processed to round the corner of the particle to attain a percentage of absolute volume of >=60% and the particle size distribution of the aggregate is adjusted to pass 25-40% of the aggregate through a 0.6mm sieve, 7-15% through a 0.3mm sieve and <=5% through a 0.15mm sieve.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、モルタル・コンクリー
トを施工するための方法に関し、とりわけ、調合される
骨材をコランダム(α−Al2 3 )を主成分とした鉱
物組成とし、その骨材の粒度分布を調整することにより
ワーカビリティーを向上するようにしたモルタル・コン
クリートの施工方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing mortar / concrete, and in particular, the aggregate to be prepared has a mineral composition mainly composed of corundum (α-Al 2 O 3 ) and the bone The present invention relates to a mortar / concrete construction method for improving workability by adjusting the particle size distribution of the material.

【0002】[0002]

【従来の技術】一般に、モルタル・コンクリートは、セ
メント等の硬化剤,砂等の骨材,砂利等の粗骨材および
減水剤等から構成される。これらモルタル・コンクリー
トの組成物を水と混練すると、セメントの成分である酸
化カルシウム,二酸化けい素,酸化マグネシウム等が水
と反応し、前記骨材を包含して徐々に硬化し、凝固して
いく。前記減水剤は、セメントの分散性を向上し、モル
タル・コンクリート混練用の水量を減少する機能を有す
る。
2. Description of the Related Art Generally, mortar and concrete are composed of a hardening agent such as cement, an aggregate such as sand, a coarse aggregate such as gravel and a water reducing agent. When these mortar-concrete compositions are kneaded with water, the components of cement such as calcium oxide, silicon dioxide, magnesium oxide, etc. react with water and gradually harden and solidify including the aggregates. .. The water reducing agent has the functions of improving the dispersibility of cement and reducing the amount of water for mortar / concrete kneading.

【0003】ところで、かかるモルタル・コンクリート
では、圧縮強度が高いものが望ましく、現在、圧縮強度
が800〜1000Kgf/cm2 程度の高強度モルタル・
コンクリートが実際に使用されるが、近年では更に、1
000Kgf/cm2 以上の圧縮強度を有する超高強度モル
タル・コンクリートが要望されるに至っている。
By the way, it is desirable that such mortar-concrete has a high compressive strength, and at present, a high-strength mortar with a compressive strength of about 800 to 1000 Kgf / cm 2.
Concrete is actually used, but in recent years,
There has been a demand for ultra-high strength mortar concrete having a compressive strength of 000 Kgf / cm 2 or more.

【0004】そこで、前記超硬強度モルタル・コンクリ
ートを製造するために高い硬度を備えた骨材を用いる必
要があり、このような高硬度の骨材としてはコランダム
(α−Al2 3 )を主成分とする焼成ボーキサイトを
用いることが本願発明者により提案されている。
Therefore, it is necessary to use an aggregate having a high hardness in order to produce the cemented carbide mortar / concrete, and corundum (α-Al 2 O 3 ) is used as such an aggregate having a high hardness. It has been proposed by the inventor of the present invention to use calcined bauxite as the main component.

【0005】[0005]

【発明が解決しようとする課題】しかしながら、α−A
2 3を主成分とする骨材を用いる場合、一般に骨材
として使用する川砂,丘砂等に比較してワーカビリティ
ーが悪化されてしまうため、モルタル・コンクリートの
打設時に支障が来されてしまう。例えば、ワーカビリテ
ィーが悪いと高性能AE減水剤の添加量が増大する傾向
にあり、その結果、セメントペーストの粘度が高くなっ
てワーカビリティーはより悪い方向へと進んでしまうと
いう課題があった。
However, α-A
When using an aggregate containing l 2 O 3 as a main component, the workability is deteriorated as compared with river sand or hill sand generally used as an aggregate, which causes a problem when placing mortar and concrete. I will end up. For example, if the workability is poor, the amount of the high-performance AE water reducing agent added tends to increase, and as a result, the viscosity of the cement paste becomes high, and the workability tends to worsen.

【0006】そこで、本発明は骨材の粒度分布を調整す
ることにより、施工時のワーカビリティーを著しく向上
することができるモルタル・コンクリートの施工方法を
提供することを目的とする。
Therefore, an object of the present invention is to provide a mortar-concrete construction method capable of remarkably improving the workability during construction by adjusting the particle size distribution of the aggregate.

【0007】[0007]

【課題を解決するための手段】かかる目的を達成するた
めに本発明は、コランダム(α−Al2 3 )を主成分
とする骨材の角を取って粒形を整形し、この骨材の粒度
を、ふるい目が0.6mmで25〜40%の通過率,0.
3mmで7〜15%の通過率,0.15mmで5%以下の通
過率となるように調整する。
In order to achieve such an object, the present invention is to remove the corners of an aggregate mainly composed of corundum (α-Al 2 O 3 ) to shape the grain shape, The grain size was 0.5 to 40 mm and the passage rate was 25 to 40%.
Adjust so that the passage rate is 7 to 15% at 3 mm and 5% or less at 0.15 mm.

【0008】[0008]

【作用】かかる本発明のモルタル・コンクリートの施工
方法にあっては、コランダム(α−Al2 3 )を主成
分とする骨材で形成したので、骨材自体の強度(硬度)
を極めて高くすることができる。一方、このように硬度
を十分確保した骨材の角を取り、かつ、この骨材のふる
い目の通過率を0.6mmで25〜40%,0.3mmで7
〜15%,0.15mmで5%以下となるように調整した
ので、骨材の粗粒率を最適な範囲に収めることができる
とともに、超高強度モルタル・コンクリートの圧縮強度
を変えることなく施工する際のワーカビリティーを大幅
に向上することができる。
In the mortar-concrete construction method of the present invention, since the aggregate is composed of corundum (α-Al 2 O 3 ) as the main component, the strength (hardness) of the aggregate itself is high.
Can be extremely high. On the other hand, the corner of the aggregate with sufficient hardness is removed, and the pass ratio of the sieve of the aggregate is 25 to 40% at 0.6 mm and 7 at 0.3 mm.
Since it was adjusted to be less than 5% at -15% and 0.15mm, it is possible to keep the coarse grain ratio of the aggregate within the optimum range and to perform it without changing the compressive strength of ultra high strength mortar concrete. The workability when doing can be improved significantly.

【0009】[0009]

【実施例】以下、本発明の実施例を詳細に説明する。即
ち、本実施例のモルタル・コンクリートの施工方法にあ
っては、まず、ポルトランドセメントに対して重量比が
5〜20%のポゾラン活性作用をもつ超微粉末添加材を
混入する。そして、これらの結合材に対して1〜5%の
高性能減水剤または高性能AE減水剤を混入し、使用す
る水結合材比を25%以下とする。更に、このようにし
て調合したセメントマトリックスに対して、コランダム
(α−Al2 3 )を主成分とする骨材を、モルタル・
コンクリート1m3 あたりの容積比で5%以上混入す
る。
EXAMPLES Examples of the present invention will be described in detail below. That is, in the mortar-concrete construction method of this embodiment, first, an ultrafine powder additive having a pozzolanic activity of 5 to 20% by weight relative to Portland cement is mixed. Then, 1 to 5% of a high-performance water reducing agent or a high-performance AE water reducing agent is mixed into these binders to make the water binder ratio to be 25% or less. Furthermore, the cement matrix prepared in this manner was mixed with an aggregate containing corundum (α-Al 2 O 3 ) as a main component in a mortar.
Mix 5% or more by volume ratio per 1 m 3 of concrete.

【0010】このときの骨材としては、見掛比重が2.
9以上で、かつ、圧縮強度が2000Kgf/cm2 以上の
ものを用いる。例えば、骨材の鉱物組成をコランダム
(α−Al2 3 )およびムライト(Al6 Si
2 13)を主成分とする焼成ボーキサイトを用い、この
ボーキサイトにはルータイル(TiO2 )を含まないも
のが望ましく、その化学組成としては、Al2 3が8
6%以上,Fe2 3 が2.5%以下,SiO2 が7.
5%以下,TiO2 が3.5%以下ととしたものが用い
られる。
The apparent specific gravity of the aggregate at this time is 2.
A material having a compression strength of 9 or more and a compression strength of 2000 kgf / cm 2 or more is used. For example, the mineral composition of the aggregates may be corundum (α-Al 2 O 3 ) and mullite (Al 6 Si).
2 O 13 ) is used as the main component, and it is desirable that this bauxite does not contain routoil (TiO 2 ), and its chemical composition is Al 2 O 3 of 8
6% or more, Fe 2 O 3 is 2.5% or less, and SiO 2 is 7.
It is used that the content is 5% or less and the content of TiO 2 is 3.5% or less.

【0011】ここで、本実施例では前記骨材の角を取っ
て粒形を整形し、この骨材の粒度を次に示すように調整
する。尚、骨材の角は実積率60%以上となる程度に取
ることが望ましい。
Here, in this embodiment, the corners of the aggregate are taken to shape the grain shape, and the grain size of this aggregate is adjusted as shown below. In addition, it is desirable that the corner of the aggregate is set to an extent that the actual volume ratio is 60% or more.

【0012】ところで、前記骨材の粒度調整は、0.6
mm,0.3mm,0.15mmとなる3種類のふるい目を用
意し、0.6mmのふるい目の通過率を25〜40%,
0.3mmのふるい目の通過率を7〜15%,0.15mm
のふるい目の通過率を5%以下とする。
By the way, the grain size adjustment of the aggregate is 0.6
mm, 0.3mm, 0.15mm three types of sieves are prepared, the passage rate of 0.6mm sieve is 25-40%,
Passage rate of 0.3mm sieve is 7-15%, 0.15mm
The pass rate of the sieve mesh is 5% or less.

【0013】図1は粗粒率の異なる骨材のふるい目の寸
法に対する通過率を示したグラフで、特性aは粗粒率が
略2.4,特性bは粗粒率が略2.7,特性cは粗粒率
が略3.1,特性dは粗粒率が略3.2となっている。
そして、このように骨材の粗粒率をそれぞれ変化させた
場合には、図2に示すようにコンクリートのスランプお
よびフロー値をそれぞれ変化させることができる。尚、
図2中各特性a,b,c,dの4週強度を、それぞ
れ()を付して示してある。
FIG. 1 is a graph showing the pass rates of the aggregates having different coarse grain ratios with respect to the size of the sieve. The characteristic a has a coarse grain ratio of about 2.4, and the characteristic b has a coarse grain ratio of about 2.7. The characteristic c has a coarse grain ratio of about 3.1, and the characteristic d has a coarse grain ratio of about 3.2.
When the coarse particle ratio of the aggregate is changed in this way, the slump and flow value of the concrete can be changed as shown in FIG. still,
In FIG. 2, the four-week intensity of each of the characteristics a, b, c, and d is shown in parentheses.

【0014】従って、前記図1および図2から、上述し
たように骨材のふるい目の通過率を調整して粒度分布を
変化させ、粗粒率が2.4から3.2にすることによ
り、施工時のワーカビリティーが大幅に改善されること
が理解される。このように本実施例では骨材の粒度調整
することにより、従来のように減水剤の添加量を増大す
ること無く超高強度モルタル・コンクリートの施工を確
実に行うことができる。
Therefore, from FIG. 1 and FIG. 2, as described above, by adjusting the pass ratio of the sieve of the aggregate to change the particle size distribution, the coarse particle ratio is changed from 2.4 to 3.2. It is understood that the workability during construction is greatly improved. As described above, in this embodiment, by adjusting the particle size of the aggregate, it is possible to surely perform the construction of the ultra-high-strength mortar / concrete without increasing the addition amount of the water reducing agent as in the conventional case.

【0015】[0015]

【発明の効果】以上説明したように本発明のモルタル・
コンクリートの施工方法にあっては、コランダム(α−
Al2 3 )を主成分とする骨材で形成したので、骨材
自体の強度(硬度)を極めて高くすることができる。ま
た、骨材の角を取り、かつ、この骨材のふるい目の通過
率を0.6mmで25〜40%,0.3mmで7〜15%,
0.15mmで5%以下となるように調整することによ
り、骨材の粗粒率を最適な範囲に収めて、超高強度モル
タル・コンクリートを施工する際のワーカビリティーを
大幅に向上することができるという優れた効果を奏す
る。
As described above, the mortar of the present invention
Corundum (α-
Since the aggregate is composed mainly of Al 2 O 3 ), the strength (hardness) of the aggregate itself can be made extremely high. Moreover, the corner of the aggregate is removed, and the passing rate of the sieve of this aggregate is 25 to 40% at 0.6 mm, 7 to 15% at 0.3 mm,
By adjusting it to be 5% or less at 0.15 mm, it is possible to keep the coarse particle ratio of the aggregate within the optimum range and significantly improve the workability when constructing ultra-high strength mortar concrete. It has an excellent effect.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の施工方法において、骨材の粒度調整す
るためのふるい目の寸法に対する通過率の関係を示すグ
ラフである。
FIG. 1 is a graph showing a relationship of a passing rate with respect to a size of a sieve for adjusting a grain size of an aggregate in a construction method of the present invention.

【図2】本発明の施工方法において、骨材の粗粒率に対
するコンクリートのスランプおよびフロー値の関係を示
すグラフである。
FIG. 2 is a graph showing the relationship between the slump and flow value of concrete with respect to the coarse particle ratio of aggregate in the construction method of the present invention.

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 FI 技術表示箇所 C04B 14:02 Z 2102−4G 20:00) A 2102−4G (72)発明者 一瀬 賢一 東京都清瀬市下清戸4丁目640番地 株式 会社大林組技術研究所内─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification number Internal reference number FI Technical display area C04B 14:02 Z 2102-4G 20:00) A 2102-4G (72) Inventor Kenichi Ichinose Tokyo 4-640 Shimoseito, Kiyose-shi Obayashi Corporation Technical Research Institute Co., Ltd.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 コランダム(α−Al2 3 )を主成分
とする骨材の角を取って粒形を整形し、この骨材の粒度
を、ふるい目が0.6mmで25〜40%の通過率,0.
3mmで7〜15%の通過率,0.15mmで5%以下の通
過率となるように調整したことを特徴とするモルタル・
コンクリートの施工方法。
1. An aggregate containing corundum (α-Al 2 O 3 ) as a main component is removed to shape the grain shape, and the grain size of the aggregate is 25 to 40% at a sieve of 0.6 mm. Passing rate of 0.
Mortar characterized by adjusting the passage rate of 7 to 15% at 3 mm and the passage rate of 5% or less at 0.15 mm.
Concrete construction method.
JP3246521A 1991-09-02 1991-09-02 Mortar and concrete construction method Expired - Fee Related JP2853403B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3246521A JP2853403B2 (en) 1991-09-02 1991-09-02 Mortar and concrete construction method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3246521A JP2853403B2 (en) 1991-09-02 1991-09-02 Mortar and concrete construction method

Publications (2)

Publication Number Publication Date
JPH0558688A true JPH0558688A (en) 1993-03-09
JP2853403B2 JP2853403B2 (en) 1999-02-03

Family

ID=17149638

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3246521A Expired - Fee Related JP2853403B2 (en) 1991-09-02 1991-09-02 Mortar and concrete construction method

Country Status (1)

Country Link
JP (1) JP2853403B2 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995018077A1 (en) * 1993-12-28 1995-07-06 Chichibu Onoda Cement Co. Concrete compositions and method of manufacturing concrete
US5638937A (en) * 1995-01-13 1997-06-17 Inventio Ag Handrail drive system conversion
JP2006247912A (en) * 2005-03-09 2006-09-21 Nichiha Corp Inorganic molded object and its manufacturing method
JP2006265048A (en) * 2005-03-24 2006-10-05 Mino Ceramic Co Ltd Temperature rise suppressing aggregate
WO2010017583A1 (en) * 2008-08-11 2010-02-18 Glosstone Pty Ltd Concrete
JP2019163176A (en) * 2018-03-19 2019-09-26 太平洋マテリアル株式会社 Polymer cement mortar

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5111065B2 (en) * 2007-11-12 2012-12-26 株式会社大林組 Grout

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995018077A1 (en) * 1993-12-28 1995-07-06 Chichibu Onoda Cement Co. Concrete compositions and method of manufacturing concrete
US5638937A (en) * 1995-01-13 1997-06-17 Inventio Ag Handrail drive system conversion
JP2006247912A (en) * 2005-03-09 2006-09-21 Nichiha Corp Inorganic molded object and its manufacturing method
JP4718210B2 (en) * 2005-03-09 2011-07-06 ニチハ株式会社 Inorganic molded body and method for producing the same
JP2006265048A (en) * 2005-03-24 2006-10-05 Mino Ceramic Co Ltd Temperature rise suppressing aggregate
WO2010017583A1 (en) * 2008-08-11 2010-02-18 Glosstone Pty Ltd Concrete
JP2019163176A (en) * 2018-03-19 2019-09-26 太平洋マテリアル株式会社 Polymer cement mortar

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