JP2007176742A - Shearing strength-reinforced type lightweight concrete - Google Patents

Shearing strength-reinforced type lightweight concrete Download PDF

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JP2007176742A
JP2007176742A JP2005377228A JP2005377228A JP2007176742A JP 2007176742 A JP2007176742 A JP 2007176742A JP 2005377228 A JP2005377228 A JP 2005377228A JP 2005377228 A JP2005377228 A JP 2005377228A JP 2007176742 A JP2007176742 A JP 2007176742A
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lightweight
concrete
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Eizo Takeshita
永造 竹下
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Taiheiyo Materials Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide shearing strength-reinforced type lightweight concrete lightened using lightweight aggregate whose shearing strength is increased to that of common concrete using no lightweight aggregate without jointly using a reinforcing material and preparing blending and composition leading to the reduction in the properties of the application. <P>SOLUTION: The shearing strength-reinforced type lightweight concrete comprises: fine aggregate; coarse aggregate; and cement. The fine aggregate is lightweight aggregate, and the coarse aggregate is common aggregate, or, using lightweight aggregate and common aggregate for the fine aggregate, ≥40 vol.% of the fine aggregate is composed of lightweight aggregate, and the coarse aggregate is composed of common aggregate. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、剪断強度が強化された軽量コンクリートに関する。   The present invention relates to a lightweight concrete with enhanced shear strength.

高層ビル等の建築物や橋梁部材等のコンクリート二次製品に、構造物の自重を小さくするために軽量コンクリートが用いられることが多い。コンクリートの軽量化を図るには、骨材に軽量骨材を使用するのが一般的で、軽量骨材を用いた軽量コンクリートには、細骨材に普通細骨材、粗骨材に軽量粗骨材（又はその一部を普通粗骨材に置換）を使用した軽量骨材コンクリート１種と、細骨材に軽量細骨材（又は軽量細骨材を主体に一部を普通粗骨材）、粗骨材に軽量粗骨材（又は軽量粗骨材を主体に一部を普通粗骨材）を使用した軽量骨材コンクリート２種がある。（例えば、非特許文献１参照。）軽量コンクリートに使用する軽量骨材は、気孔率を著しく増大させることによって比重を下げ、重量軽減を図っている。このため軽量コンクリートは、概ね緻密な普通骨材を用いた普通コンクリートよりも、圧縮強度はほぼ同等の水準まで発現できるものの、曲げ強度や剪断強度はおよそ３割程度低いものしか得られず、疲労強度に至っては半減以下になり易い。特に軽量コンクリートの剪断強度については、乾燥状態によっては引張強度が低下し易いために、同等の圧縮強度を有する普通コンクリートの少なくとも７０％になることが必要とされている。また、実用的見地からは普通コンクリート並の剪断強度を有するのが望ましい。軽量骨材コンクリート１種の改良として、細骨材に使用する普通細骨材の一部を軽量細骨材に置換したものを用い、粗骨材に使用する軽量粗骨材の一部を普通粗骨材に置換したものを用いることで、圧縮強度と曲げ強度を軽量骨材コンクリート１種のおよそ１．５倍以上に高められることが知られている。（例えば、特許文献１参照。）この改良では、剪断強度も向上する可能性はあるものの、普通コンクリートと比べると依然隔った低い値にしかならない可能性が高い。   Light-weight concrete is often used in concrete secondary products such as buildings such as high-rise buildings and bridge members in order to reduce the weight of the structure. In order to reduce the weight of concrete, it is common to use lightweight aggregates for the aggregates. For lightweight concrete using lightweight aggregates, fine aggregates are usually fine aggregates and coarse aggregates are lightweight coarse. One type of lightweight aggregate concrete that uses aggregate (or a part of it is replaced with ordinary coarse aggregate), and lightweight fine aggregate for fine aggregate (or a part of ordinary coarse aggregate mainly for lightweight fine aggregate) ), There are two types of lightweight aggregate concrete that use lightweight coarse aggregate (or light coarse aggregate as a main part and ordinary coarse aggregate in part). (For example, refer nonpatent literature 1.) The lightweight aggregate used for lightweight concrete is reducing specific gravity and reducing weight by increasing a porosity remarkably. For this reason, lightweight concrete can exhibit compressive strength almost equivalent to that of ordinary concrete using generally dense ordinary aggregates, but only about 30% lower bending strength and shear strength can be obtained. The strength tends to be less than half. In particular, the shear strength of lightweight concrete is required to be at least 70% of that of ordinary concrete having an equivalent compressive strength because the tensile strength tends to decrease depending on the dry state. From a practical standpoint, it is desirable to have a shear strength comparable to that of ordinary concrete. As an improvement of one kind of lightweight aggregate concrete, a part of ordinary fine aggregate used for fine aggregate is replaced with lightweight fine aggregate, and a part of lightweight coarse aggregate used for coarse aggregate is usually used It is known that compressive strength and bending strength can be increased to about 1.5 times or more of one type of lightweight aggregate concrete by using a coarse aggregate. (For example, refer to Patent Document 1.) Although this improvement may improve the shear strength, it is highly likely that the improvement will still be a low value that is still far away from that of ordinary concrete.

軽量コンクリートの剪断強度を向上させる手段として、剪断補強鉄筋を導入する方法が従前より行われているが、普通コンクリート並の剪断強度を得る為には構造物に大量に配置せねばならず、構造物の自重が増して軽量化のために軽量コンクリートを使用するという妙味が乏しくなる。また、部材厚さを増して強度補償を図ったり、水セメント比を低減させて結合相の強度を高める方法もあるが、前者は設計上の制約から限界があることに加え、顕著な強度向上効果も得られない。後者の方法ではコンクリートの圧縮強度はかなり向上させられるものの、曲げ強度や剪断強度の向上は鈍く、また配合水量の大幅低減は施工性状の悪化等を伴うことから限界がある。構造物の軽量化を維持しつつ、水セメント比の大幅低減等を行わずに曲げ強度や剪断強度等を向上させる方法として、鋼繊維をコンクリート中に分散させる方法が知られている。（例えば、特許文献２参照。）しかし、鋼繊維の使用は、資材コストの大幅な上昇をもたらし、また、軽量コンクリート構成各成分と比べ、高い比重を有する鋼繊維の使用は、比重差のため均質なコンクリート組成物を得るのが容易ではない。
財団法人日本土木学会編、「２００５年制定コンクリート標準示方書［基準編］ＪＩＳ規格」、第１版、財団法人日本規格協会、２００５年２月２３日、ｐ．２６６ 特開２００１−１０６５６０号公報 特開２００２−１２１０６０号公報 As a means of improving the shear strength of lightweight concrete, a method of introducing a shear reinforcing bar has been used for some time, but in order to obtain a shear strength comparable to that of ordinary concrete, it must be placed in a large amount in the structure. The weight of things increases and the light taste of using lightweight concrete for weight reduction becomes poor. In addition, there are methods to increase the thickness of the member to compensate for strength, or to reduce the water-cement ratio to increase the strength of the binder phase. There is no effect. In the latter method, although the compressive strength of the concrete can be considerably improved, the improvement in bending strength and shear strength is slow, and the drastic reduction in the amount of blended water is limited because it deteriorates the construction properties. A method of dispersing steel fibers in concrete is known as a method for improving bending strength and shear strength without significantly reducing the water-cement ratio while maintaining the weight of the structure. (For example, refer to Patent Document 2) However, the use of steel fibers leads to a significant increase in material costs, and the use of steel fibers having a high specific gravity compared to each component of lightweight concrete is due to the difference in specific gravity. It is not easy to obtain a homogeneous concrete composition.
The Japan Society of Civil Engineers, “Concrete Standards Specification [Standard] JIS Standard Established in 2005”, 1st Edition, Japan Standards Association, February 23, 2005, p. 266 JP 2001-106560 A JP 2002-121060 A

本発明は、軽量骨材を用いて軽量化を行う軽量コンクリートで、補強材を併用したり施工性状の低下に繋がるような配合・組成にすることなく、軽量骨材を用いない普通コンクリート並に剪断強度が高められた剪断強度強化型軽量コンクリートの提供を課題とする。   The present invention is a lightweight concrete that is reduced in weight using lightweight aggregates, and is used in the same manner as ordinary concrete that does not use lightweight aggregates, without using a reinforcing material or mixing and composition that leads to a decrease in construction properties. It is an object of the present invention to provide a lightweight concrete with enhanced shear strength and increased shear strength.

本発明者は、前記課題解決のためコンクリートの破壊メカニズムの観点から検討を進めた結果、従前の如く粗骨材に軽量骨材を使用した軽量コンクリートでは破壊に至る亀裂の進行が軽量粗骨材を貫通直進し易く、この場合、コンクリート全体として破壊面積が相対的に小さくなるため剪断強度も低位の水準に留まるが、軽量化を図るための軽量骨材の使用を細骨材にし、粗骨材は軽量骨材より強固な普通骨材を用いると、破壊に至る亀裂の進行が軽量細骨材では貫通するものの粗骨材の存在箇所では貫通せずに径の大きい骨材外周を迂回し易く、亀裂が直進する場合に比べ破壊エネルギーがより消費されることに加えて、コンクリート全体として破壊面積が相対的に大きくなることから剪断強度も高くなると云う知見を得、軽量コンクリートでも普通コンクリート並の剪断強度を得ることができたことから本発明を完成させた。   As a result of studying the failure mechanism of concrete to solve the above problems, the present inventor has found that the progress of cracks leading to breakage is reduced in lightweight concrete using lightweight aggregate as coarse aggregate as before. In this case, the fracture area of the concrete as a whole is relatively small, so the shear strength remains at a low level, but the use of lightweight aggregates to reduce the weight is reduced to coarse aggregates. If a normal aggregate stronger than a lightweight aggregate is used, the progress of cracks leading to fracture penetrates in the lightweight fine aggregate, but bypasses the outer periphery of the larger aggregate without penetrating in the presence of coarse aggregate. In addition to the fact that the fracture energy is consumed more than the case where the crack goes straight, the fact that the fracture area of the concrete as a whole is relatively large has also resulted in the finding that the shear strength is high, and the lightweight concrete But the present invention has been completed from the fact that it was possible to obtain the shear strength of ordinary concrete average.

即ち、本発明は、細骨材と粗骨材とセメントを含有してなる軽量コンクリートであって、細骨材が軽量骨材であり、粗骨材が普通骨材であることを特徴とする剪断強度強化型軽量コンクリート（Ａ）である。   That is, the present invention is a lightweight concrete comprising fine aggregate, coarse aggregate and cement, wherein the fine aggregate is a lightweight aggregate and the coarse aggregate is a normal aggregate. Shear strength-enhanced lightweight concrete (A).

また、本発明は、セメントと細骨材と粗骨材を含有してなる軽量コンクリートであって、細骨材の４０容積％以上１００容積％未満が軽量骨材で残部が普通骨材であり、粗骨材が普通骨材であることを特徴とする剪断強度強化型軽量コンクリート（Ｂ）である。   Further, the present invention is a lightweight concrete containing cement, fine aggregate and coarse aggregate, wherein 40% by volume or more and less than 100% by volume of the fine aggregate is light aggregate and the rest is ordinary aggregate. The lightweight concrete (B) with enhanced shear strength is characterized in that the coarse aggregate is ordinary aggregate.

本発明によれば、単位容積質量が２．３ｔ／ｍ3以下の軽量コンクリートであっても普通コンクリートと同程度の剪断強度が確保できることから、建築・土木構造物の自重を施工上の制約を殆ど受けずに低減することができ、また本発明の軽量コンクリートを用いれば強度補償のために構造物の部材厚さを増したり、補強材を併用するようなことも減少することができる。 According to the present invention, even if it is a lightweight concrete having a unit volume mass of 2.3 t / m 3 or less, the same level of shear strength as that of ordinary concrete can be ensured. If the lightweight concrete of the present invention is used, the thickness of the member of the structure can be increased or the use of a reinforcing material can be reduced for the purpose of strength compensation.

本発明の剪断強度強化型軽量コンクリート（Ａ）は、軽量骨材を用いて軽量化がなされた単位容積質量が２．３ｔ／ｍ3以下で規定される軽量コンクリートであり、少なくともセメントと細骨材と粗骨材を含有するものであって、細骨材に軽量細骨材を用い、粗骨材に普通骨材を用いたものである。 The shear strength-enhanced lightweight concrete (A) of the present invention is a lightweight concrete defined by a unit volume mass of 2.3 t / m 3 or less that has been reduced in weight using a lightweight aggregate, and includes at least cement and fine bone. It contains a material and a coarse aggregate, and a light fine aggregate is used for the fine aggregate and a normal aggregate is used for the coarse aggregate.

本発明の剪断強度強化型軽量コンクリート（Ａ）に使用するセメントは構造部材や構築物に使用できるものであれば何れのセメントでも良く、例えば、普通、早強、超早強、低熱等の各種ポルトランドセメント、中庸熱セメント、高ビーライトセメント、アルミナセメント、エコセメントの他、高炉セメントやフライアッシュセメント等の混合セメントでも良い。   The cement used in the shear strength-enhanced lightweight concrete (A) of the present invention may be any cement as long as it can be used for structural members and structures. For example, various Portland cements such as normal, early strength, ultra-early strength, and low heat. In addition to cement, medium heat cement, high belite cement, alumina cement, eco-cement, mixed cement such as blast furnace cement and fly ash cement may be used.

本発明の剪断強度強化型軽量コンクリート（Ａ）に使用する細骨材は軽量細骨材とする。軽量細骨材は絶乾密度１．８以下のものなら特に限定されず、例えば火山礫を粉砕・整粒した天然軽量骨材、膨張性頁岩や流紋岩等の天然鉱石に必要により発泡助剤を加えて焼成された人工軽量骨材、産業副次生成物や廃棄物である例えば膨張スラグ、石炭灰、下水汚泥焼却灰、都市ゴミ焼却灰等を高温加熱して得られる副産軽量骨材等が挙げられる。本発明の剪断強度強化型軽量コンクリートに使用する細骨材の配合量は、セメント１００質量部に対し、１００〜３００質量部が好ましい。１００質量部未満では軽量化が行えないことがあり、また３００質量部を超えると圧縮強度が低下し易いので適当ではない。   The fine aggregate used for the shear strength-enhanced lightweight concrete (A) of the present invention is a lightweight fine aggregate. The lightweight fine aggregate is not particularly limited as long as it has an absolute dry density of 1.8 or less. For example, natural lightweight aggregate obtained by pulverizing and sizing volcanic gravel, natural ore such as expansive shale, rhyolite, etc. Artificial light-weight aggregates fired with additives, industrial by-products and waste such as expanded slag, coal ash, sewage sludge incineration ash, municipal waste incineration ash, etc. Materials and the like. The compounding amount of the fine aggregate used for the shear strength-enhanced lightweight concrete of the present invention is preferably 100 to 300 parts by mass with respect to 100 parts by mass of cement. If the amount is less than 100 parts by mass, the weight may not be reduced. If the amount exceeds 300 parts by mass, the compressive strength tends to decrease.

本発明の剪断強度強化型軽量コンクリート（Ａ）に使用する粗骨材は普通粗骨材とする。普通粗骨材は、特に限定されず、例えば川砂利、海砂利、砕石等が挙げられ、これら利用した再生骨材でも良い。本発明の剪断強度強化型軽量コンクリートに使用する細骨材の配合量は、セメント１００質量部に対し、１００〜３００質量部が好ましい。１００質量部未満では必要なワーカビィリティが得られないことがあるので適当ではなく、また３００質量部を超えると強度低下を起こし易いため適当ではない。   The coarse aggregate used for the light-weight concrete (A) with enhanced shear strength according to the present invention is usually coarse aggregate. The ordinary coarse aggregate is not particularly limited, and examples thereof include river gravel, sea gravel, crushed stone, and the like. The compounding amount of the fine aggregate used for the shear strength-enhanced lightweight concrete of the present invention is preferably 100 to 300 parts by mass with respect to 100 parts by mass of cement. If the amount is less than 100 parts by mass, the necessary workability may not be obtained, so that it is not appropriate. If the amount exceeds 300 parts by mass, the strength tends to decrease.

本発明の剪断強度強化型軽量コンクリート（Ａ）は、前記のセメントと細骨材と粗骨材以外の成分を本発明の効果を実質喪失させない範囲で含むことができる。このような成分としてモルタルやコンクリートに使用することができる各種の混和材・剤があり、具体的には、分散剤、減水剤、高性能減水剤、ＡＥ減水剤、高性能ＡＥ減水剤、空気連行剤、消泡剤、防錆剤、白華防止剤、凝結遅延剤、凝結促進剤、膨張材、収縮低減剤、分離防止剤、高強度助剤、速硬剤、増粘剤、撥水剤、防水剤、抗菌剤、ポリマー樹脂、顔料等が例示される。   The shear strength-enhanced lightweight concrete (A) of the present invention can contain components other than the cement, fine aggregate and coarse aggregate as long as the effects of the present invention are not substantially lost. There are various admixtures / agents that can be used for mortar and concrete as such components. Specifically, dispersants, water reducing agents, high-performance water reducing agents, AE water reducing agents, high-performance AE water reducing agents, air Entraining agent, antifoaming agent, rust preventive agent, anti-whitening agent, setting retarder, setting accelerator, expansion material, shrinkage reducing agent, anti-separation agent, high-strength auxiliary agent, fast curing agent, thickener, water repellent Agents, waterproofing agents, antibacterial agents, polymer resins, pigments and the like.

また、本発明の剪断強度強化型軽量コンクリート（Ｂ）は、軽量骨材を用いて軽量化がなされた単位容積質量が２．３ｔ／ｍ3以下で規定される軽量コンクリートであり、少なくともセメントと細骨材と粗骨材を含有するものであって、細骨材に軽量細骨材と普通細骨材を併用し、粗骨材に普通粗骨材を用いたものである。即ち、細骨材の４０容積％以上１００容積％未満が軽量細骨材で、残部細骨材が普通細骨材とし、粗骨材は普通粗骨材を使用したものである。軽量細骨材は、前記の剪断強度強化型軽量コンクリート（Ａ）と同様のものを用いることができるが、軽量細骨材と共に使用する普通細骨材は、特に限定されず、例えば川砂、海砂、山砂、砕砂等が挙げられ、これら何れか２種以上の混合砂でも良い。軽量細骨材と普通細骨材を併用することでコンクリートの剪断強度をより高くすることができる。普通細骨材の含有割合を増すとこの傾向が強まるが、軽量細骨材が細骨材の４０容積％未満になると重量増加により単位容積質量が２．３ｔ／ｍ3以下の軽量コンクリートが得難くなるので好ましくない。 Further, the shear strength-enhanced lightweight concrete (B) of the present invention is a lightweight concrete defined by a unit volume mass of 2.3 t / m 3 or less that has been reduced in weight using a lightweight aggregate, and at least cement and It contains fine aggregates and coarse aggregates, and is a combination of lightweight fine aggregates and ordinary fine aggregates used as fine aggregates and ordinary coarse aggregates used as coarse aggregates. That is, 40% by volume or more and less than 100% by volume of the fine aggregate is a lightweight fine aggregate, the remaining fine aggregate is a normal fine aggregate, and the coarse aggregate is a normal coarse aggregate. The lightweight fine aggregate can be the same as the above-described shear strength-enhanced lightweight concrete (A), but the ordinary fine aggregate used together with the lightweight fine aggregate is not particularly limited. For example, river sand, sea Sand, mountain sand, crushed sand and the like can be mentioned, and any two or more of them may be mixed sand. The combined use of lightweight fine aggregate and ordinary fine aggregate can increase the shear strength of concrete. Increasing the content of ordinary fine aggregates increases this tendency. However, when the light-weight fine aggregate is less than 40% by volume of the fine aggregate, a lightweight concrete with a unit volume mass of 2.3 t / m 3 or less is obtained due to the weight increase. Since it becomes difficult, it is not preferable.

また、本発明の剪断強度強化型軽量コンクリート（Ｂ）に使用するセメント、粗骨材及び任意配合成分である各種混和材・剤については、前記の剪断強度強化型軽量コンクリート（Ａ）と同様のものを使用でき、その配合量も、細骨材については軽量細骨材と普通細骨材の合計量を細骨材量とし、剪断強度強化型軽量コンクリート（Ａ）の場合と同様で良い。   In addition, the cement, coarse aggregate, and various admixtures / agents that are optional blending components used in the shear strength-enhanced lightweight concrete (B) of the present invention are the same as those of the shear strength-enhanced lightweight concrete (A). As for the fine aggregate, the total amount of the lightweight fine aggregate and the ordinary fine aggregate is used as the fine aggregate amount, and may be the same as in the case of the lightweight concrete (A) with enhanced shear strength.

本発明の剪断強度強化型軽量コンクリートの製造方法は特に限定されるものではなく、剪断強度強化型軽量コンクリート（Ａ）及び（Ｂ）とも、例えば前記のようなセメント、細骨材及び粗骨材、更に必要により混和材・剤を用い、これらを所定量秤量した後、コンクリートミキサー等の混練機に投入し、水を加えて混練することでフレッシュコンクリートを作製し、これを施工・打設し、適宜養生することによって得ることができる。フレッシュコンクリート作製時の水の配合量は、セメント１００質量部に対し、２５〜７５質量部が好ましく、３５〜６０質量部がより好ましい。２５質量部未満の配合水量ではワーカビリティが極端に低下するため適当ではなく、７５質量部を超える配合水量では硬化不良や強度低下を起こすことがあるので適当ではない。   The method for producing the shear strength-enhanced lightweight concrete of the present invention is not particularly limited. For example, the cement, fine aggregate, and coarse aggregate as described above may be used for both the shear strength-enhanced lightweight concrete (A) and (B). Further, if necessary, use admixtures / agents, weigh a predetermined amount of them, put them into a kneader such as a concrete mixer, and add water to knead to produce fresh concrete, which is then constructed and placed. It can be obtained by appropriate curing. 25-75 mass parts is preferable with respect to 100 mass parts of cement, and, as for the compounding quantity of water at the time of fresh concrete preparation, 35-60 mass parts is more preferable. A blending water amount of less than 25 parts by weight is not appropriate because workability is extremely reduced, and a blending water amount of more than 75 parts by weight is not suitable because it may cause poor curing or reduced strength.

以下、実施例により本発明を具体的に詳しく説明するが、本発明はここで表す実施例に限定されるものではない。
次に記す各材料を表１に表す配合量となるよう、５０リットル用強制パン型ミキサに一括投入し、１５秒間乾式混合した。次いで表１に表す量の水を加え、９０秒間混練してフレッシュ状態のコンクリート約３０リットルを作製した。
Ａ；普通ポルトランドセメント（太平洋セメント株式会社製）
Ｂ１；軽量細骨材（絶乾比重１．７５、商品名「太平洋アサノライト」、太平洋マテリアル株式会社製）
Ｂ２；普通細骨材（表乾比重２．６０、小笠産陸砂）
Ｃ１；軽量粗骨材（絶乾比重１．２５、最大径１５ｍｍ、商品名「太平洋アサノライト」、太平洋マテリアル株式会社製）
Ｃ２；普通粗骨材（表乾比重２．６３、最大径１５ｍｍ、岩瀬産砕石）
Ｄ；高性能減水剤（商品名「レオビルドＳＰ８Ｎ」、ポゾリス物産株式会社製） EXAMPLES Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited to the examples shown here.
Each material described below was put all at once into a 50-liter forced pan mixer so as to have the blending amounts shown in Table 1, and dry-mixed for 15 seconds. Next, water of the amount shown in Table 1 was added and kneaded for 90 seconds to produce about 30 liters of fresh concrete.
A: Ordinary Portland cement (manufactured by Taiheiyo Cement Co., Ltd.)
B1: Light-weight fine aggregate (absolute density 1.75, trade name “Pacific Asanolite”, manufactured by Taiheiyo Materials Co., Ltd.)
B2: Ordinary fine aggregate (surface dry specific gravity 2.60, land of Ogasa land)
C1: Lightweight coarse aggregate (absolute specific gravity 1.25, maximum diameter 15 mm, trade name “Pacific Asanolite”, manufactured by Taiheiyo Materials Co., Ltd.)
C2: Ordinary coarse aggregate (surface dry specific gravity 2.63, maximum diameter 15mm, Iwase crushed stone)
D: High performance water reducing agent (trade name “Leo Build SP8N”, manufactured by Pozoris Bussan Co., Ltd.)

Figure 2007176742
Figure 2007176742

作製したフレッシュコンクリートを内寸１０×１０×４０ｃｍの成形型枠に打設し、２４時間後に脱型して供試体を得た。該供試体を土木学会基準ＪＳＣＥ−Ｇ５５３（鋼繊維補強コンクリートのせん断強度試験方法）に準拠した方法で、剪断強度を測定した。また、ＪＩＳ Ａ １１０８に準拠した方法で、圧縮強度を測定した。以上の強度測定にはコンクリート配合１水準に対し１２本使用した。更に、供試体質量を測定し、その供試体外形寸法から計算した体積から供試体の単位容積質量を算出した。以上の結果を表２に表す。   The prepared fresh concrete was placed in a mold having an internal size of 10 × 10 × 40 cm, and demolded after 24 hours to obtain a specimen. The specimen was measured for shear strength by a method in accordance with Japan Society of Civil Engineers JSCE-G553 (shear strength test method for steel fiber reinforced concrete). Further, the compressive strength was measured by a method based on JIS A 1108. For the above strength measurement, 12 pieces were used per level of concrete blending. Furthermore, the specimen mass was measured, and the unit volume mass of the specimen was calculated from the volume calculated from the outer dimensions of the specimen. The above results are shown in Table 2.

Figure 2007176742
Figure 2007176742

表２より、本発明の軽量コンクリートの剪断強度（本発明品１〜３）は、普通骨材のみを使用した普通コンクリート（参考品１）の剪断強度値の９０％以上の値が得られ、従来の軽量骨材コンクリート１種及び２種あるいはその公知改良品よりも高い剪断強度が得られることがわかる。   From Table 2, the shear strength (invention products 1 to 3) of the lightweight concrete of the present invention is 90% or more of the shear strength value of ordinary concrete (reference product 1) using only ordinary aggregate, It can be seen that higher shear strength can be obtained than conventional light aggregates 1 and 2 or their known improvements.

Claims (2)

セメントと細骨材と粗骨材を含有してなる軽量コンクリートであって、細骨材が軽量骨材であり、粗骨材が普通骨材であることを特徴とする剪断強度強化型軽量コンクリート。 Lightweight concrete containing cement, fine aggregate, and coarse aggregate, wherein the fine aggregate is a lightweight aggregate and the coarse aggregate is a normal aggregate. . セメントと細骨材と粗骨材を含有してなる軽量コンクリートであって、細骨材の４０容積％以上１００容積％未満が軽量骨材で残部が普通骨材であり、粗骨材が普通骨材であることを特徴とする剪断強度強化型軽量コンクリート。 Lightweight concrete containing cement, fine aggregate, and coarse aggregate, and 40% by volume to less than 100% by volume of the fine aggregate is light aggregate and the balance is normal aggregate, and coarse aggregate is normal Lightweight concrete with enhanced shear strength, characterized by being an aggregate.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014177774A (en) * 2013-03-13 2014-09-25 Taiheiyo Cement Corp Concrete pavement and method for suppressing cracking of concrete pavement
JP2015107893A (en) * 2013-12-05 2015-06-11 株式会社トクヤマエムテック Concrete composition
CN107200524A (en) * 2017-07-13 2017-09-26 西安建筑科技大学 A kind of superhigh intensity and high bond performance fibre reinforced concrete and preparation method thereof

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Publication number Priority date Publication date Assignee Title
JPH0797283A (en) * 1993-09-29 1995-04-11 Kanegafuchi Chem Ind Co Ltd Light-weight concrete
JPH1192200A (en) * 1997-09-18 1999-04-06 Hazama Gumi Ltd Low-shrinking concrete composition
JP2001106560A (en) * 1999-10-06 2001-04-17 Sumitomo Osaka Cement Co Ltd Lightweight concrete and its manufacturing method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0797283A (en) * 1993-09-29 1995-04-11 Kanegafuchi Chem Ind Co Ltd Light-weight concrete
JPH1192200A (en) * 1997-09-18 1999-04-06 Hazama Gumi Ltd Low-shrinking concrete composition
JP2001106560A (en) * 1999-10-06 2001-04-17 Sumitomo Osaka Cement Co Ltd Lightweight concrete and its manufacturing method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014177774A (en) * 2013-03-13 2014-09-25 Taiheiyo Cement Corp Concrete pavement and method for suppressing cracking of concrete pavement
JP2015107893A (en) * 2013-12-05 2015-06-11 株式会社トクヤマエムテック Concrete composition
CN107200524A (en) * 2017-07-13 2017-09-26 西安建筑科技大学 A kind of superhigh intensity and high bond performance fibre reinforced concrete and preparation method thereof

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