JP7074527B2 - Cement composite - Google Patents
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- JP7074527B2 JP7074527B2 JP2018060275A JP2018060275A JP7074527B2 JP 7074527 B2 JP7074527 B2 JP 7074527B2 JP 2018060275 A JP2018060275 A JP 2018060275A JP 2018060275 A JP2018060275 A JP 2018060275A JP 7074527 B2 JP7074527 B2 JP 7074527B2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Description
本発明は速硬性かつ軽量のセメント複合材に関する。 The present invention relates to a fast-curing and lightweight cement composite.
現在、コンクリート構造物は老朽化が進んでいる。コンクリート構造物の修繕の例として、RC床版は高品質なプレキャストコンクリートを床版へ取り換える方法が実施、普及しつつある。 この工法には、コンクリート床版間の継手部を埋める際に、別途コンクリート打設が必要になる。そのコンクリートにもプレキャストコンクリートと同等の性質が望ましいが、通常、間詰に用いるコンクリートは現場で製造、打設するため、床版のコンクリートと比べて、高い品質のコンクリート製造が難しいのが現状である。間詰に使用されるコンクリートに必要な性質は早期道路開放のために速硬性、自重軽減による建設コストの削減の観点から軽量であること、劣化因子への耐久性、床版間の密着性を考慮して寸法安定性等が挙げられる。 Currently, concrete structures are aging. As an example of repairing concrete structures, RC floor slabs are being implemented and popularized by replacing high-quality precast concrete with floor slabs. This method requires separate concrete placement when filling the joints between concrete decks. It is desirable that the concrete has the same properties as precast concrete, but since the concrete used for filling is usually manufactured and placed on site, it is difficult to manufacture high-quality concrete compared to floor slab concrete. be. The properties required for concrete used for packing are quick-hardening for early road opening, light weight from the viewpoint of reducing construction costs by reducing its own weight, durability against deterioration factors, and adhesion between decks. Dimensional stability and the like can be mentioned in consideration.
短時間で強度発現性を得るために、速硬性のあるセメントや混和材料を添加した水硬性材料が使用されている。また、これらの材料にセメント混和用ポリマーを加え、速硬性と耐久性を考慮した水硬性組成物が提案されている（特許文献１、２等）。 In order to obtain strength development in a short time, a water-hardening material to which a fast-hardening cement or an admixture material is added is used. Further, a hydraulic composition has been proposed in which a polymer for cement miscibility is added to these materials in consideration of quick-curing property and durability (Patent Documents 1, 2 and the like).
また、ポリマーを混和することで、外部からの劣化因子浸透を抑制することが知られており、乾燥収縮ひずみも低下することが知られている。さらに上記コンクリートに軽量骨材を使用することで、軽量化ならびに自己養生効果による乾燥収縮ひずみの低減が期待できる。 Further, it is known that by mixing a polymer, the penetration of deterioration factors from the outside is suppressed, and the drying shrinkage strain is also known to be reduced. Furthermore, by using a lightweight aggregate for the concrete, it is expected that the weight will be reduced and the drying shrinkage strain due to the self-curing effect will be reduced.
本発明者らは、速硬性を有したセメント複合材を検討するにあたり、軽量骨材ならびにセメント混和用ポリマーを用いた配合を鋭意検討した結果、あるコンクリート配合において、速硬性を失わずに硬化後の乾燥収縮ひずみが少ないセメント複合材が経済的に得られるとの知見を得た。本発明は、係る知見に基づいてなされたものである。
したがって、本発明は、速硬性を有し、乾燥収縮ひずみが少ないセメント複合材を提供するものである。
In studying a cement composite material having fast-hardening properties, the present inventors have diligently studied a formulation using a lightweight aggregate and a polymer for admixture of cement. It was found that a cement composite material with less drying shrinkage strain can be economically obtained. The present invention has been made based on such findings.
Therefore, the present invention provides a cement composite material having fast hardening properties and low drying shrinkage strain.
すなわち、本発明は、次の〔１〕～〔３〕を提供するものである。
〔１〕セメント、速硬性セメント混和材、セメント混和用ポリマー、凝結遅延剤及び絶乾密度が１．０～２．３ｇ／ｃｍ３の軽量骨材を含有し、かつ前記セメント混和用ポリマーが、セメントと速硬性セメント混和材の合量１００質量部に対して４～１４質量部であるセメント複合材。
〔２〕前記軽量骨材が絶乾密度１．０～２．０ｇ／ｃｍ３の粗骨材である〔１〕のセメント複合材。
〔３〕さらに、絶乾密度１．５～２．３ｇ／ｃｍ３の細骨材を含む〔２〕のセメント複合材。
That is, the present invention provides the following [1] to [3].
[1] The cement admixture polymer contains cement, a fast-curing cement admixture, a cement admixture polymer, a setting retarder, and a lightweight aggregate having an absolute dry density of 1.0 to 2.3 g / cm 3 . A cement composite material having 4 to 14 parts by mass with respect to 100 parts by mass of the total amount of the cement and the quick-hardening cement admixture.
[2] The cement composite material of [1], wherein the lightweight aggregate is a coarse aggregate having an absolute dry density of 1.0 to 2.0 g / cm 3 .
[3] Further, the cement composite material of [2] containing a fine aggregate having an absolute dry density of 1.5 to 2.3 g / cm 3 .
速硬性を有し、かつ乾燥収縮ひずみの少ない軽量のセメント複合材が経済的に得られる。 A lightweight cement composite material having fast hardening properties and low drying shrinkage strain can be economically obtained.
本発明の実施形態が、以下、説明される。
本発明はセメント、速硬性セメント混和材、セメント混和用ポリマー、凝結遅延剤及び絶乾密度が１．０～２．３ｇ／ｃｍ３の軽量骨材を含有してなるセメント複合材である。
Embodiments of the present invention will be described below.
The present invention is a cement composite material containing cement, a fast-curing cement admixture, a cement admixture polymer, a setting retarder and a lightweight aggregate having an absolute dry density of 1.0 to 2.3 g / cm 3 .
本発明で用いられるセメントとしては、工業的に製造されるポルトランドセメントが使用できる。例えば、普通、早強、超早強、低熱及び中庸熱等の各種ポルトランドセメントが挙げられる。また、前記ポルトランドセメントに、フライアッシュ、高炉スラグ、シリカフューム又は石灰石微粉末等が混合された各種の混合セメントが挙げられる。これらセメントの一種であっても、二種以上のものであっても良い。 As the cement used in the present invention, industrially manufactured Portland cement can be used. For example, various Portland cements such as ordinary, early-strength, ultra-early-strength, low-grade fever and moderate-grade fever can be mentioned. Further, various mixed cements in which fly ash, blast furnace slag, silica fume, limestone fine powder and the like are mixed with the Portland cement can be mentioned. It may be one kind of these cements or two or more kinds of cements.
本発明で用いられる速硬性セメント混和材は、セメントに添加することによって早期に硬化を促進する材料を指す。いわゆるセメント・コンクリート用の硬化促進剤と呼ばれるものであり、例えば硝酸塩、亜硝酸塩、アルミン酸塩系等の液体系のもの、カルシウムアルミネート類を有効成分として含む粉体系のものが挙げられるが、特に短時間強度発現性の観点からは、カルシウムアルミネート類を含む粉体系の速硬性セメント混和材が好ましい。これらの速硬性セメント混和材はセメント１００質量部に対して５～１００質量部添加される。 The fast-curing cement admixture used in the present invention refers to a material that promotes hardening at an early stage by being added to cement. It is a so-called hardening accelerator for cement and concrete, and examples thereof include liquid-based ones such as nitrates, nitrites and aluminates, and powder-based ones containing calcium aluminates as an active ingredient. In particular, from the viewpoint of short-term strength development, a powder-based quick-hardening cement admixture containing calcium aluminates is preferable. These fast-curing cement admixtures are added in an amount of 5 to 100 parts by mass with respect to 100 parts by mass of cement.
前記速硬性セメント混和材の有効成分として含まれるカルシウムアルミネート類には、ＣａＯをＣ、Ａｌ２Ｏ３をＡ、Ｎａ２ＯをＮ、Ｆｅ２Ｏ３をＦで表示した場合、Ｃ３Ａ，Ｃ２Ａ，Ｃ１２Ａ７，Ｃ５Ａ３，ＣＡ，Ｃ３Ａ５又はＣＡ２等と表示される鉱物組成を有するカルシウムアルミネート、Ｃ２ＡＦ，Ｃ４ＡＦ等と表示されるカルシウムアルミノフェライト、カルシウムアルミネートにハロゲンが固溶又は置換したＣ３Ａ３・ＣａＦ２やＣ１１Ａ７・ＣａＦ２等と表示されるカルシウムフロロアルミネートを含むカルシウムハロアルミネート、Ｃ８ＮＡ３やＣ３Ｎ２Ａ５等と表示されるカルシウムナトリウムアルミネート、カルシウムリチウムアルミネート、アウイン（３ＣａＯ・３Ａｌ２Ｏ３・ＣａＳＯ４）等のカルシウムサルホアルミネート、アルミナセメント、並びにこれらにＳｉＯ２，Ｋ２Ｏ，Ｆｅ２Ｏ３，ＴｉＯ２等が固溶又は化合したもの等が含まれる。特にカルシウムアルミネートを有効成分として含むものが好ましい。含まれるカルシウムアルミネート類は一種であっても、二種以上であっても良い。さらに、安定した強度発現性の観点からカルシウムアルミネート類に硫酸ナトリウム、硫酸カリウム、硫酸カルシウム等の硫酸塩が併用された速硬性セメント混和材が好ましい。カルシウムアルミネート類を有効成分として含む粉体系の速硬性セメント混和材の添加量としては、セメント１００質量部に対して２０～７０質量部が好ましい。 The calcium aluminates contained as the active ingredient of the fast-curing cement admixture include CaO as C , Al 2 O 3 as A, Na 2 O as N, and Fe 2 O 3 as F. , C 2 A, C 12 A 7 , C 5 A 3 , CA, C 3 A 5 or CA 2 etc. Calcium aluminate having a mineral composition, C 2 AF, C 4 AF etc. Calcium haloaluminate containing calcium fluoroaluminate labeled as C 3 A 3 / CaF 2 or C 11 A7 / CaF 2 in which halogen is dissolved or substituted in alminoferrite or calcium aluminate, C 8 NA 3 or C Calcium sodium aluminate, calcium lithium aluminate, calcium sulfate such as Auin ( 3CaO・3Al2O3・CaSO4 ), alumina cement, and SiO2 , K2, which are labeled as 3 N 2 A 5 etc. Includes O, Fe 2 O 3 , TiO 2 , etc. that are solid-dissolved or combined. In particular, those containing calcium aluminate as an active ingredient are preferable. The calcium aluminates contained may be one kind or two or more kinds. Further, from the viewpoint of stable strength development, a fast-curing cement admixture in which calcium sulfates and sulfates such as sodium sulfate, potassium sulfate and calcium sulfate are used in combination is preferable. The amount of the powder-based quick-hardening cement admixture containing calcium aluminates as an active ingredient is preferably 20 to 70 parts by mass with respect to 100 parts by mass of the cement.
なお、前記セメントと速硬性セメント混和材の代替とし、「ジェットセメント」（商品名）等の超速硬セメントも使用することができる。 As an alternative to the cement-fast-hardening cement admixture, ultrafast-hardening cement such as "jet cement" (trade name) can also be used.
本発明で用いられるセメント混和用ポリマーは、一般にセメント混和用に使用されている何れのポリマーも使用することができるが、アクリル酸エステル系ポリマー、アクリルスチレン系ポリマー、スチレンブタジエン（ＳＢＲ）系ポリマー、酢酸ビニル系ポリマー、エチレン酢酸ビニル系ポリマー、酢酸ビニル／バーサチック酸ビニルエステル系ポリマー、エチレンビニルアルコール（ＥＶＡ）系ポリマー、酢酸ビニル／バーサチック酸ビニル／アクリル酸エステル系ポリマー等が好ましい。これらのポリマーは、通常ポリマーディスパージョンの形態で市販されているもの、及び再乳化粉末樹脂として市販されているもののいずれでもよい。これらの中で、スチレンブタジエン系ポリマーが特に好ましい。 As the polymer for admixture of cement used in the present invention, any polymer generally used for admixture of cement can be used, but acrylic acid ester-based polymers, acrylic styrene-based polymers, styrene butadiene (SBR) -based polymers, and the like. Vinyl acetate-based polymers, ethylene vinyl acetate-based polymers, vinyl acetate / versatic acid vinyl ester-based polymers, ethylene vinyl alcohol (EVA) -based polymers, vinyl acetate / versatic acid vinyl / acrylic acid ester-based polymers and the like are preferable. These polymers may be either commercially available in the form of polymer dispersions or commercially available as re-emulsified powder resins. Of these, styrene-butadiene polymers are particularly preferred.
ポリマー（ポリマーの固形分）の配合量は、前記セメントと速硬性セメント混和材の合量１００質量部に対して、４～１４質量部である。当該量とすることで、強度発現性に影響せずに、硬化後のポリマーフィルム形成による乾燥収縮ひずみ量を低減する。４質量部未満の場合は、乾燥収縮ひずみ量が増加し、一方１４質量部を超えると、強度発現性及び耐久性の低下がみられる。好ましくは、５～１２質量部であり、より好ましくは７～１１質量部である。 The blending amount of the polymer (solid content of the polymer) is 4 to 14 parts by mass with respect to 100 parts by mass of the total amount of the cement and the quick-hardening cement admixture. By setting the amount to this amount, the amount of drying shrinkage strain due to polymer film formation after curing is reduced without affecting the strength development. When it is less than 4 parts by mass, the amount of drying shrinkage strain increases, while when it exceeds 14 parts by mass, the strength development and durability are decreased. It is preferably 5 to 12 parts by mass, and more preferably 7 to 11 parts by mass.
本発明における凝結遅延剤はセメントの凝結に遅延作用を及ぼすものである。凝結遅延剤は、液状のもの、粉体状のものいずれでも構わないが、液状のものが好ましい。凝結遅延剤が液状のものを好ましいとしたのは、遅延効果が速やかに得られるからである。このような液状凝結遅延剤としては、例えばクエン酸、グルコン酸、リンゴ酸、酒石酸などの有機酸、又はその塩、ホウ酸、ホウ酸ナトリウム等のホウ酸塩、リン酸塩、炭酸ナトリウム、炭酸カリウム、重炭酸ナトリウム、重炭酸カリウム等の無機塩、糖類などの群の中から選ばれる一種又は二種以上を含む液状（例えば、水溶液、エマルジョン、懸濁液の形態）のものが挙げられる。中でも、クエン酸、クエン酸塩、酒石酸、酒石酸塩、アルカリ金属炭酸塩の群の中から選ばれる一種又は二種以上を含む水溶液が用いられると、セメント複合材の可使時間が長く、かつ、初期の強度発現が高いことから好ましい。 The setting retarder in the present invention has a delaying action on the setting of cement. The setting retarder may be either liquid or powdery, but a liquid one is preferable. The reason why the liquid setting retarder is preferable is that the delaying effect can be obtained quickly. Examples of such a liquid setting retarder include organic acids such as citric acid, gluconic acid, malic acid and tartrate, or salts thereof, borates such as boric acid and sodium borate, phosphates, sodium carbonate and carbonic acid. Examples thereof include liquids (for example, in the form of an aqueous solution, an emulsion, or a suspension) containing one or more selected from the group of inorganic salts such as potassium, sodium bicarbonate, potassium bicarbonate, and sugars. Above all, when an aqueous solution containing one or more selected from the group of citric acid, citrate, tartaric acid, tartaric acid, and alkali metal carbonate is used, the usable time of the cement composite material is long and the pot life is long. It is preferable because the initial strength development is high.
凝結遅延剤の配合量は、セメント複合材の可使時間や初期強度発現性の観点から、前記セメントと速硬性セメント混和材の合量１００質量部に対して、０．０５～２．０質量部が好ましい。セメント複合材の可使時間は、２０分以上確保することが好ましい。より好ましくは、３０分以上であり、更に好ましくは６０分以上である。打設現場における温度や施工状況を考慮の上、適切な施工性が確保されるよう、可使時間が設定され、凝結遅延剤の配合量が決定される。 The blending amount of the setting retarder is 0.05 to 2.0 mass with respect to 100 parts by mass of the total amount of the cement and the quick-hardening cement admixture from the viewpoint of the pot life of the cement composite material and the initial strength development. The unit is preferable. It is preferable to secure a pot life of 20 minutes or more for the cement composite material. More preferably, it is 30 minutes or more, and further preferably 60 minutes or more. The pot life is set and the amount of the setting retarder is determined so that appropriate workability is ensured in consideration of the temperature and construction conditions at the casting site.
本発明に用いられる軽量骨材は、絶乾密度が１．０～２．３ｇ／ｃｍ３である。この範囲の軽量骨材を使用することによって、軽量性および初期の圧縮強度を満足するセメント複合材が得られる。上記の軽量骨材としては、粗骨材、細骨材のいずれか一方、または両方を使用することができる。より具体的には、少なくとも粗骨材として、絶乾密度が１．０～２．０ｇ／ｃｍ３での軽量骨材を使用することが好ましい。さらに細骨材としては、絶乾密度が１．５～２．３ｇ／ｃｍ３ある軽量骨材を使用することが好ましく、これらを併用して使用する場合が特に好ましい。粗骨材の絶乾密度は、１．０～１．５ｇ／ｃｍ３がより好ましく、１．１～１．４ｇ／ｃｍ３がさらに好ましく、１．２～１．３ｇ／ｃｍ３が特に好ましい。細骨材の絶乾密度は１．５～２．０ｇ／ｃｍ３がより好ましく、１．６～１．８ｇ／ｃｍ３がさらに好ましく、１．６３～１．７３ｇ／ｃｍ３が特に好ましい。 The lightweight aggregate used in the present invention has an absolute dry density of 1.0 to 2.3 g / cm 3 . By using a lightweight aggregate in this range, a cement composite that satisfies the lightness and the initial compressive strength can be obtained. As the above-mentioned lightweight aggregate, either one or both of coarse aggregate and fine aggregate can be used. More specifically, it is preferable to use a lightweight aggregate having an absolute dry density of 1.0 to 2.0 g / cm 3 as at least a coarse aggregate. Further, as the fine aggregate, it is preferable to use a lightweight aggregate having an absolute dry density of 1.5 to 2.3 g / cm 3 , and it is particularly preferable to use these in combination. The absolute dry density of the coarse aggregate is more preferably 1.0 to 1.5 g / cm 3 , further preferably 1.1 to 1.4 g / cm 3 , and particularly preferably 1.2 to 1.3 g / cm 3 . .. The absolute dry density of the fine aggregate is more preferably 1.5 to 2.0 g / cm 3 , further preferably 1.6 to 1.8 g / cm 3 , and particularly preferably 1.63 to 1.73 g / cm 3 .
軽量骨材の配合量は、軽量性および初期の圧縮強度の観点から、２００～１６００ｋｇ／ｍ３が好ましい。４００～１４００ｋｇ／ｍ３がより好ましく、４５０～１０００ｋｇ／ｍ３がさらに好ましい。 The blending amount of the lightweight aggregate is preferably 200 to 1600 kg / m 3 from the viewpoint of lightness and initial compressive strength. 400 to 1400 kg / m 3 is more preferable, and 450 to 1000 kg / m 3 is even more preferable.
本発明において使用される水は、特に限定されるものではなく、水道水などを使用することができる。水の配合量（単位水量）は、７０～１５０ｋｇ／ｍ３とすることが、フレッシュコンクリート性状、初期強度発現性、乾燥収縮性の観点から好ましい。また、水の配合量は、前記セメントと速硬性セメント混和材の合量１００質量部に対し、１５～３０質量部とすることが好ましい。 The water used in the present invention is not particularly limited, and tap water or the like can be used. The blending amount (unit water amount) of water is preferably 70 to 150 kg / m 3 from the viewpoint of fresh concrete properties, initial strength development, and drying shrinkage. The amount of water to be blended is preferably 15 to 30 parts by mass with respect to 100 parts by mass of the total amount of the cement and the quick-hardening cement admixture.
本発明におけるセメント複合材には、上記以外の成分として、本発明の特長が損なわれない範囲で、各種添加材が併用されても良い。この種の添加材としては、例えば減水剤、ＡＥ減水剤、高性能減水剤、高性能ＡＥ減水剤、流動化剤等のセメント分散剤、発泡剤、起泡剤、防水剤、防錆剤、収縮低減剤、増粘剤、保水剤、顔料、撥水剤、白華防止剤、消泡剤、高炉スラグ微粉末、フライアッシュ、石粉、シリカフューム、火山灰等が挙げられる。 As a component other than the above, various additives may be used in combination with the cement composite material in the present invention as long as the features of the present invention are not impaired. Examples of this type of additive include cement dispersants such as water reducing agents, AE water reducing agents, high-performance water reducing agents, high-performance AE water reducing agents, and fluidizing agents, foaming agents, foaming agents, waterproofing agents, and rust preventive agents. Examples thereof include shrinkage reducing agents, thickeners, water retaining agents, pigments, water repellents, efflorescence inhibitors, defoaming agents, blast furnace slag fine powder, fly ash, stone powder, silica fume, and volcanic ash.
セメント複合材の混練方法としては、特に限定されないが、製造量や均質な混練性の観点から、ミキサを用いる方法が好ましい。ミキサとしては、連続式ミキサやバッチ式ミキサが用いられる。例えば、パン型コンクリートミキサ、パグミル型コンクリートミキサ、重力式コンクリートミキサ等が挙げられる。混練時間は１２０秒～３６０秒が好ましい。 The method for kneading the cement composite material is not particularly limited, but a method using a mixer is preferable from the viewpoint of the production amount and uniform kneading property. As the mixer, a continuous mixer or a batch mixer is used. For example, a pan-type concrete mixer, a pug mill-type concrete mixer, a gravity-type concrete mixer, and the like can be mentioned. The kneading time is preferably 120 seconds to 360 seconds.
以下、実施例を挙げて本発明を詳細に説明するが、本発明は何らこれらに限定されるものではない。 Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited thereto.
＜使用材料＞
（１）セメント：普通ポルトランドセメント（太平洋セメント社製、密度；３．１６ｇ／ｃｍ３）
（２）速硬性セメント混和材：カルシウムアルミネート系急硬材（カルシウムアルミネート及び硫酸塩を含む、密度；２．９３ｇ／ｃｍ３）
（３）セメント混和用ポリマー：スチレンブタジエン系ポリマー（固形分４５％、密度；１．００ｇ／ｃｍ３）
（４）凝結遅延剤：クエン酸系遅延剤、水溶液として添加
（５）軽量骨材：ａ）人工軽量細骨材（絶乾密度１．６８ｇ／ｃｍ３）
ｂ）人工軽量粗骨材（絶乾密度１．２５ｇ／ｃｍ３）
（６）通常骨材：ａ）静岡県掛川産山砂（絶乾密度２．５１ｇ／ｃｍ３）
ｂ）茨城県桜川産砕石（絶乾密度２．６１ｇ／ｃｍ３）
（７）水：水道水
<Material used>
(1) Cement: Ordinary Portland cement (manufactured by Taiheiyo Cement, density; 3.16 g / cm 3 )
(2) Quick-hardening cement admixture: Calcium-aluminate-based rapid-hardening material (containing calcium aluminate and sulfate, density; 2.93 g / cm 3 )
(3) Polymer for cement admixture: Styrene-butadiene polymer (solid content 45%, density; 1.00 g / cm 3 )
(4) Condensation retarder: Citric acid-based retarder, added as an aqueous solution (5) Lightweight aggregate: a) Artificial lightweight fine aggregate (absolute dry density 1.68 g / cm 3 )
b) Artificial lightweight coarse aggregate (absolute dry density 1.25 g / cm 3 )
(6) Normal aggregate: a) Mountain sand from Kakegawa, Shizuoka Prefecture (absolute dry density 2.51 g / cm 3 )
b) Crushed stone from Sakuragawa, Ibaraki Prefecture (absolute dry density 2.61 g / cm 3 )
(7) Water: Tap water
上記材料を使用して、２０℃環境下で評価試験を行った。そのときのコンクリート配合を表１に示す。単位はｋｇ／ｍ３である。凝結遅延剤の添加量はセメントと速硬性セメント混和材の合量１００質量部に対して０．５質量部（固形分換算）とした。 Using the above materials, an evaluation test was conducted in an environment of 20 ° C. Table 1 shows the concrete composition at that time. The unit is kg / m 3 . The amount of the setting retarder added was 0.5 parts by mass (in terms of solid content) with respect to 100 parts by mass of the total amount of the cement and the quick-hardening cement admixture.
＜評価試験＞
（１）圧縮強度
圧縮強度は、ＪＩＳ Ａ １１０８に準拠し、２０℃環境下でコンクリート供試体を材齢６時間における強度を測定した。
（２）乾燥収縮ひずみ
乾燥収縮ひずみは、ＪＩＳ Ａ １１２９に準拠して行い、材齢１８２日まで測定した。
<Evaluation test>
(1) Compressive strength The compressive strength was measured in accordance with JIS A 1108, and the strength of the concrete specimen at a material age of 6 hours was measured in an environment of 20 ° C.
(2) Dry shrinkage strain Dry shrinkage strain was measured according to JIS A 1129 and measured up to 182 days of age.
＜試験結果＞
試験結果を表２に示す。ポリマー量は、セメントと速硬性セメント混和材の合量１００質量部に対するポリマーの固形分換算量である。ポリマー量が所定の範囲内かつ、軽量コンクリートI種を配合（実施例１～４）においては、圧縮強度が材齢６時間で２４Ｎ／ｍｍ２以上でかつ材齢１８２日の乾燥収縮ひずみはポリマー量に比例して増加した。軽量コンクリートII種を配合（実施例５）においてより顕著な結果となった。一方、通常骨材と用いた配合、ポリマー量が所定範囲外の配合のうち少なくとも一つが組み合わされる水準（比較例１～５）では、材齢６時間の圧縮強度が２４Ｎ／ｍｍ２に達しないか、もしくは材齢１８２日の乾燥収縮ひずみが実施例と比べて大きくなった。
<Test results>
The test results are shown in Table 2. The amount of the polymer is the amount of the polymer in terms of solid content with respect to 100 parts by mass of the total amount of the cement and the fast-curing cement admixture. When the amount of polymer is within a predetermined range and the lightweight concrete type I is blended (Examples 1 to 4), the compressive strength is 24 N / mm 2 or more at 6 hours and the drying shrinkage strain at 182 days is polymer. Increased in proportion to the amount. More remarkable results were obtained in the compounding of lightweight concrete type II (Example 5). On the other hand, at a level (Comparative Examples 1 to 5) in which at least one of the formulations used with the normal aggregate and the formulations having a polymer amount outside the predetermined range is combined, the compressive strength at 6 hours of age does not reach 24 N / mm 2 . Or, the drying shrinkage strain at the age of 182 days was larger than that in the examples.
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| JP2007246293A (en) | 2006-03-13 | 2007-09-27 | Nippon Mesaraito Kogyo Kk | Low shrinkage type light-weight concrete |
| JP2008031007A (en) | 2006-07-31 | 2008-02-14 | Denki Kagaku Kogyo Kk | Mortar or concrete composition |
| JP2013155093A (en) | 2012-01-31 | 2013-08-15 | Sumitomo Osaka Cement Co Ltd | Concrete |
| JP2015074945A (en) | 2013-10-10 | 2015-04-20 | 中日本高速道路株式会社 | Paving repair material and method for repairing pavement body by using the same |
| JP2016002673A (en) | 2014-06-16 | 2016-01-12 | 太平洋マテリアル株式会社 | Method for production of latex-modified concrete |
| JP2017114734A (en) | 2015-12-25 | 2017-06-29 | 三菱マテリアル株式会社 | Super quick hardening cement mortar |
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| JPH0920536A (en) * | 1995-06-30 | 1997-01-21 | Mitsui Cytec Kk | Admixture for carbon-fiber reinforced mortar |
| JP4112049B2 (en) * | 1997-09-18 | 2008-07-02 | 株式会社間組 | Low shrinkage concrete composition |
| JP5041683B2 (en) * | 2005-07-15 | 2012-10-03 | 学校法人日本大学 | Polymer cement mortar and method for producing the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2007246293A (en) | 2006-03-13 | 2007-09-27 | Nippon Mesaraito Kogyo Kk | Low shrinkage type light-weight concrete |
| JP2008031007A (en) | 2006-07-31 | 2008-02-14 | Denki Kagaku Kogyo Kk | Mortar or concrete composition |
| JP2013155093A (en) | 2012-01-31 | 2013-08-15 | Sumitomo Osaka Cement Co Ltd | Concrete |
| JP2015074945A (en) | 2013-10-10 | 2015-04-20 | 中日本高速道路株式会社 | Paving repair material and method for repairing pavement body by using the same |
| JP2016002673A (en) | 2014-06-16 | 2016-01-12 | 太平洋マテリアル株式会社 | Method for production of latex-modified concrete |
| JP2017114734A (en) | 2015-12-25 | 2017-06-29 | 三菱マテリアル株式会社 | Super quick hardening cement mortar |
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