JPH0352420B2 - - Google Patents
Info
- Publication number
- JPH0352420B2 JPH0352420B2 JP57140989A JP14098982A JPH0352420B2 JP H0352420 B2 JPH0352420 B2 JP H0352420B2 JP 57140989 A JP57140989 A JP 57140989A JP 14098982 A JP14098982 A JP 14098982A JP H0352420 B2 JPH0352420 B2 JP H0352420B2
- Authority
- JP
- Japan
- Prior art keywords
- alkali
- water
- sodium
- weight
- mortar
- 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.)
- Expired - Lifetime
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 239000004570 mortar (masonry) Substances 0.000 claims description 14
- 239000011230 binding agent Substances 0.000 claims description 13
- 239000004567 concrete Substances 0.000 claims description 12
- 229910052910 alkali metal silicate Inorganic materials 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 9
- 150000008044 alkali metal hydroxides Chemical class 0.000 claims description 8
- 239000003638 chemical reducing agent Substances 0.000 claims description 8
- 229910001854 alkali hydroxide Inorganic materials 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 239000012615 aggregate Substances 0.000 claims 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 9
- 239000002253 acid Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 9
- 239000011378 shotcrete Substances 0.000 description 8
- 239000002893 slag Substances 0.000 description 8
- 238000005507 spraying Methods 0.000 description 8
- 239000004115 Sodium Silicate Substances 0.000 description 5
- 239000003153 chemical reaction reagent Substances 0.000 description 5
- 239000004576 sand Substances 0.000 description 5
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 5
- 229910052911 sodium silicate Inorganic materials 0.000 description 5
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 4
- -1 alkali metal salts Chemical class 0.000 description 4
- 150000001340 alkali metals Chemical class 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
- 229910052783 alkali metal Inorganic materials 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 150000001447 alkali salts Chemical class 0.000 description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 2
- 229910001860 alkaline earth metal hydroxide Inorganic materials 0.000 description 2
- 150000004645 aluminates Chemical class 0.000 description 2
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 229910001388 sodium aluminate Inorganic materials 0.000 description 2
- 235000019795 sodium metasilicate Nutrition 0.000 description 2
- 239000000021 stimulant Substances 0.000 description 2
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 2
- 238000004017 vitrification Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910000288 alkali metal carbonate Inorganic materials 0.000 description 1
- 150000008041 alkali metal carbonates Chemical class 0.000 description 1
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 1
- 229910052915 alkaline earth metal silicate Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical class OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- YDEXUEFDPVHGHE-GGMCWBHBSA-L disodium;(2r)-3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Na+].[Na+].COC1=CC=CC(C[C@H](CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O YDEXUEFDPVHGHE-GGMCWBHBSA-L 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- PMYUVOOOQDGQNW-UHFFFAOYSA-N hexasodium;trioxido(trioxidosilyloxy)silane Chemical compound [Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[O-][Si]([O-])([O-])O[Si]([O-])([O-])[O-] PMYUVOOOQDGQNW-UHFFFAOYSA-N 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 206010022000 influenza Diseases 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 150000002826 nitrites Chemical class 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000004936 stimulating effect Effects 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical class [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 1
- 125000001174 sulfone group Chemical group 0.000 description 1
- POWFTOSLLWLEBN-UHFFFAOYSA-N tetrasodium;silicate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-][Si]([O-])([O-])[O-] POWFTOSLLWLEBN-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
〈産業上の利用分野〉
本発明は、急結性、付着性、及び化学抵抗性に
すぐれた吹付モルタル・コンクリート組成物に関
する。
〈従来の技術とその課題〉
従来、ポルトランドセメント、あるいは、これ
にアルミン酸ソーダーや炭酸ソーダーなどの急結
剤を添加したものを結合材とする吹付材が使用さ
れていた。
しかしながら、このような吹付材では、酸性土
壌や酸性水が湧出する場所では、耐久性の大きな
工事ができないという課題があつた。
また、付着力が十分でないため、吹付け時の材
料のロスが大きく、コストアツプになると共に、
吹付け面に付着せずに落下した吹付け用コンクリ
ート、即ち、リバウンドした吹付材の後処理にも
大変な労力を必要とするという課題もあつた。
本発明者らは、このような課題を解決するた
め、種々検討を重ねた結果、結合材として、微粉
の潜在水硬性物質、特定のアルカリ物質、及び減
水剤を含有したものを用いればよいことを知見
し、本発明を完成するに至つた。
〈課題を解決するための手段〉
即ち、本発明は、粉末度がブレーン2000cm2／ｇ
以上の潜在水硬性物質、アルカリ珪酸塩、及びア
ルカリ水酸化物からなる結合材と、減水剤、水、
並びに骨材を含有することを特徴とする吹付モル
タル・コンクリート組成物である。
以下、詳しく本発明について説明する。
本発明に係る潜在水硬性物質として、例えば、
高炉スラグ転炉スラグのような鉄鋼スラグ、さら
に、フライアツシユなどを挙げることができ、中
でも、高炉スラグを水で急冷した高炉水砕スラグ
が最も適している。
高炉水砕スラグのガラス化率は50％以上が好ま
しく、塩基度（CaO＋MgO＋Al2O3）／SiO2は
1.5以上が最も好ましい。
高炉水砕スラグの粉末度は、ブレーン値で2000
cm2／ｇ以上は必要であり、3000〜6000cm2／ｇが好
ましい。2000cm2／ｇ未満であると強度発現が充分
でなく、粉末度がが8000cm2／ｇ以上になると乾燥
収縮が大きく、亀裂発生の原因となる傾向があ
る。
潜在水硬性物質は、それ自体では水和反応せず
アルカリ刺激剤と併用することによつて始めて水
和反応を起こすものである。
本発明では、アルカリ珪酸塩とアルカリ水酸化
物をアルカリ刺激剤として併用するものである。
ここで、アルカリ珪酸塩とはアルカリ金属又は
アルカリ土類金属の珪酸塩を、アルカリ水酸化物
とはアルカリ金属又はアルカリ土類金属の水酸化
物を示す。
一般に、アルカリ金属塩又はアルカリ金属水酸
化物は刺激が強く、アルカリ土類金属塩又はアル
カリ土類金属水酸化物は緩やかで強度発現が遅
い。
本発明の吹付モルタル・コンクリートは、急結
性と付着性が要求されるので、これらのアルカリ
刺激剤の中、特にアルカリ金属珪酸塩とアルカリ
金属水酸化物の使用が好ましい。
アルカリ金属にはリチウム、ナトリウム、及び
カリウム等があるが、ナトリウムが一般的であ
る。
アルカリ珪酸塩は、耐酸性の向上に効果がある
だけでなく付着力を高める効果を有する。
珪酸ナトリウムとしては、溶液あるいは粉末状
の１・２・３・４号の各種水ガラス、結晶質のメ
タ珪酸ナトリウム、オルソ珪酸ナトリウム、及び
ピロ珪酸ナトリウム等がある。
珪酸ナトリウムの組成は、Na2O／SiO2モル比
で0.1〜5.0の範囲のものが好ましい。
アルカリの水酸化物は、アルカリの刺激力が最
も強く、吹付モルタル・コンクリートの急結性に
大きく寄与する。
これらのアルカリ刺激剤は、粉末あるいは溶液
で使用して差し支えないが、吹付モルタル・コン
クリートにおいては、均一混合の面から、溶液で
用いる方が好ましい結果をもたらす。
吹付ノズルの先端で水と接触する乾式法におい
ても、できるだけミキサー中で多くの水を加えて
混練したのち吹付を行つた方が、凝結性状や付着
力の面から好ましい。
アルカリ刺激剤の使用量は、その種類などによ
つて変化するので、一義的には決定できないが、
潜在水硬性物質100重量部に対し、0.1〜50重量部
が好ましく、２〜15重量部がより好ましい。この
範囲以外の量では強度発現は悪くなる傾向があ
る。
本発明で、上記アルカリ刺激剤に、さらに、そ
の他のアルカリ金属又はアルカリ土類金属の炭酸
塩、炭酸水素塩、硫酸塩、亜硫酸塩、硝酸塩、亜
硝酸塩、リン酸塩、及びアルミン酸塩等のアルカ
リの塩類を併用することは、上記アルカリ刺激剤
の効果を助長する面で有効である。
そのうち、アルカリ金属の炭酸塩、アルミン酸
塩、及び硫酸塩等のうちの一種又は二種以上を組
み合わせて使用することがより好ましい。
アルカリ刺激剤に炭酸塩を併用することは長期
材令の強度増進の面から好ましく、硫酸塩を併用
することは、長期強度増進の他に、生成したエト
リンガイトにより膨張力が生じ、乾燥収縮による
ひびわれを低減する面から好ましい。
本発明では、さらに減水剤を併用することは強
度発現や付着性を向上する面から好ましい。
減水剤としては、一般の減水剤は全て使用する
ことができる。特に、分子内にスルホン基を有す
る化合物、オキシ有機酸塩系、及び糖類等の使用
が好ましく、それらのうちの一種又は二種以上を
選んで組み合わせ使用するのがより好ましい。
減水剤の使用量は、潜在水硬性物質100重量部
に対して、0.01〜６重量部が好ましく、0.05〜３
重量部がより好ましい。
さらに、吹付モルタル・コンクリートの付着力
を高めるために、ポリアクリルアミド、ポリビニ
ールアルコール、エチレン酢酸ビニル共重合体、
及びポリエチレンオキサイド等を混入することは
好ましい。
本発明の吹付モルタル・コンクリートは、水和
硬化に際し、容易に酸と反応して可溶性塩となる
Ca（OH）2を全く生成しないために、ポルトラン
ドセメントを使用した場合のように、Ca（OH）2
が生成する通常の場合と比べ、耐酸性が著るしく
向上するものである。
Ca（OH）2は加熱すると脱水しCaOとなり、こ
れが再水和する時に膨張破壊の原因となるもので
あるが、本発明では、それがないので耐熱性にも
すぐれたものになる。
その際に、珪砂、シヤモツト及びマグネシヤ等
の耐火性の骨材を用いることはより好ましい。
用途としては、煙道内面や焼却炉などがある。
〈実施例〉
以下、実施例をあげてさらに詳しく説明する。
実施例 １
ブレーン5650cm2／ｇ、ガラス化率90％、塩基度
1.88の高炉水砕スラグ80重量部、常磐火力産業(株)
製ブレーン5500cm2／ｇのフライアツシユ20重量
部、及び表−１に示す配合を用いて結合材を調整
し、結合材／砂比を１／４、水／結合材比を55％
のモルタルを練り、ASTM C403−65Tのプロク
ター貫入抵抗法に準じ凝結・硬化時間を測定し
た。
モルタルは、FM2.7の天然砂を使用し、結合材
をモルタルミキサーで30秒空練りした後、水を加
え10〜30秒練り混ぜし、これをすばやく型枠につ
めた。
養生は20℃、80％R.H.で行なつた。結果を表
−１に併記する。
〈使用材料〉
アルカリ珪酸塩Ａ：メタ珪酸ナトリウム、試薬一
級
アルカリ珪酸塩Ｂ：３号珪酸ナトリウム、試薬一
級
アルカリ水酸化物Ｃ：水酸化ナトリウム、試薬一
級
アルカリの塩類Ｄ：炭酸ナトリウム、試薬一級
〃 Ｅ：硫酸ナトリウム、 〃
〃 Ｆ：アルミン酸ナトリウム、試薬
一級
減水剤：リグニンスルホン酸ナトリウム、
市販品
次に、同一配合のモルタルで４×４×16cmの供
試体を作製し、20℃、80％R.H.で養生したとき
の圧縮強度と耐酸性の試験を行なつた。
耐酸性試験は、20℃で７日間養生した供試体を
５％のH2SO4又は５％HCIの酸水溶液にさらに28
日間浸漬し、浸漬前の重量に対する残存重量率
（％）で表示した。結果を表−１に併記する。
さらに、結合材360Kg／m3、水153Kg／m3、砂
1205Kg／m3、及び砂利803Kg／m3を配合し、コン
クリートとし、リバウンド率を乾式吹付により評
価した。
リバウンド率とは、吹付け面に付着せずに落下
した吹付コンクリートの割合であり、具体的には
10m3吹付けた後に落下したコンクリートの重量を
測定して、次式に従つて算出した。
リバウンド率（％）＝100×（落下したコンク
リートの重量／吹付コンクリート10m3の重量）
<Industrial Application Field> The present invention relates to a sprayed mortar/concrete composition that has excellent rapid setting properties, adhesion properties, and chemical resistance. <Conventional technology and its problems> Conventionally, a spraying material has been used in which the binder is Portland cement or a quick-setting agent such as sodium aluminate or soda carbonate added thereto. However, such sprayed materials have a problem in that they cannot be used for construction with great durability in areas where acidic soil or acidic water gushes out. In addition, because the adhesive force is not sufficient, there is a large loss of material during spraying, which increases costs.
There was also the problem that post-processing of shotcrete that fell without adhering to the spraying surface, that is, rebounded shotcrete, required a great deal of labor. In order to solve these problems, the present inventors have conducted various studies and found that it is sufficient to use a binder containing a finely powdered latent hydraulic substance, a specific alkaline substance, and a water reducing agent. This discovery led to the completion of the present invention. <Means for solving the problem> That is, the present invention has a particle size of Blaine 2000 cm 2 /g.
A binder consisting of the above latent hydraulic substance, an alkali silicate, and an alkali hydroxide, a water reducing agent, water,
It is a shotcrete mortar concrete composition characterized in that it also contains aggregate. The present invention will be explained in detail below. As the latent hydraulic substance according to the present invention, for example,
Examples include steel slag such as blast furnace slag, converter slag, and fly ash, among which granulated blast furnace slag, which is made by rapidly cooling blast furnace slag with water, is most suitable. The vitrification rate of granulated blast furnace slag is preferably 50% or more, and the basicity (CaO + MgO + Al 2 O 3 )/SiO 2 is
1.5 or more is most preferred. The fineness of granulated blast furnace slag is 2000 in Blaine value.
cm 2 /g or more is necessary, and 3000 to 6000 cm 2 /g is preferable. If it is less than 2000 cm 2 /g, the strength will not be sufficiently developed, and if the fineness is 8000 cm 2 /g or more, drying shrinkage will be large, which tends to cause cracks. A latent hydraulic substance does not undergo a hydration reaction by itself, but only causes a hydration reaction when used in combination with an alkaline stimulant. In the present invention, an alkali silicate and an alkali hydroxide are used together as an alkali stimulant. Here, the alkali silicate refers to an alkali metal or alkaline earth metal silicate, and the alkali hydroxide refers to an alkali metal or alkaline earth metal hydroxide. In general, alkali metal salts or alkali metal hydroxides are highly irritating, while alkaline earth metal salts or alkaline earth metal hydroxides are mild and slow in developing strength. Since the sprayed mortar concrete of the present invention is required to have rapid setting properties and adhesion properties, it is particularly preferable to use alkali metal silicates and alkali metal hydroxides among these alkaline stimulants. Alkali metals include lithium, sodium, and potassium, with sodium being the most common. Alkali silicates not only have the effect of improving acid resistance but also have the effect of increasing adhesion. Examples of the sodium silicate include various types of water glasses No. 1, 2, 3, and 4 in solution or powder form, crystalline sodium metasilicate, sodium orthosilicate, and sodium pyrosilicate. The composition of sodium silicate is preferably in the range of 0.1 to 5.0 in Na 2 O/SiO 2 molar ratio. Alkali hydroxide has the strongest alkali stimulating power and greatly contributes to the rapid setting of shotcrete mortar and concrete. These alkaline stimulants can be used in powder or solution form, but in shotcrete mortar concrete, it is better to use them in solution form from the standpoint of uniform mixing. Even in the dry method where the tip of the spray nozzle comes into contact with water, it is preferable to add as much water as possible in a mixer and knead it before spraying, in terms of coagulation properties and adhesion. The amount of alkaline stimulant to be used varies depending on the type and other factors, so it cannot be determined unambiguously.
It is preferably 0.1 to 50 parts by weight, more preferably 2 to 15 parts by weight, based on 100 parts by weight of the latent hydraulic substance. If the amount is outside this range, the strength development tends to be poor. In the present invention, in addition to the above alkaline stimulant, other alkali metal or alkaline earth metal carbonates, hydrogen carbonates, sulfates, sulfites, nitrates, nitrites, phosphates, aluminates, etc. The combined use of alkali salts is effective in enhancing the effect of the alkali stimulant. Among these, it is more preferable to use one or a combination of two or more of alkali metal carbonates, aluminates, sulfates, and the like. It is preferable to use carbonate in combination with an alkaline stimulant from the viewpoint of increasing strength over a long period of time.In addition to increasing long-term strength, using sulfate in combination with an alkaline stimulant is preferable because the generated ettringite generates expansion force and reduces cracking due to drying shrinkage. This is preferable from the viewpoint of reducing. In the present invention, it is preferable to further use a water reducing agent in combination, from the viewpoint of improving strength development and adhesion. As the water reducing agent, all general water reducing agents can be used. In particular, it is preferable to use compounds having a sulfone group in the molecule, oxyorganic acid salts, saccharides, etc., and it is more preferable to select one or more of them and use them in combination. The amount of water reducing agent used is preferably 0.01 to 6 parts by weight, and 0.05 to 3 parts by weight per 100 parts by weight of the latent hydraulic substance.
Parts by weight are more preferred. Furthermore, in order to increase the adhesion of shotcrete mortar and concrete, polyacrylamide, polyvinyl alcohol, ethylene vinyl acetate copolymer,
It is preferable to mix polyethylene oxide and the like. The sprayed mortar concrete of the present invention easily reacts with acids to form soluble salts during hydration hardening.
In order not to produce any Ca(OH) 2 , as in the case of using Portland cement, Ca(OH) 2
The acid resistance is significantly improved compared to the normal case in which . When Ca(OH) 2 is heated, it dehydrates to become CaO, which causes expansion failure when rehydrated, but the present invention does not have this, and therefore has excellent heat resistance. In this case, it is more preferable to use fire-resistant aggregates such as silica sand, sandstone, and magnesia. Applications include the inside of flues and incinerators. <Example> Hereinafter, the present invention will be described in more detail with reference to Examples. Example 1 Blaine 5650cm 2 /g, vitrification rate 90%, basicity
80 parts by weight of 1.88 granulated blast furnace slag, Joban Thermal Power Industry Co., Ltd.
The binder was adjusted using 20 parts by weight of fly ash of 5500 cm 2 /g and the formulation shown in Table 1, and the binder/sand ratio was 1/4 and the water/binder ratio was 55%.
The mortar was kneaded and the setting and hardening time was measured according to the Proctor penetration resistance method of ASTM C403-65T. The mortar used was natural sand with an FM2.7 rating, and the binder was mixed dry for 30 seconds in a mortar mixer, then water was added and mixed for 10 to 30 seconds, and this was quickly packed into a mold. Curing was performed at 20°C and 80%RH. The results are also listed in Table-1. <Materials used> Alkali silicate A: sodium metasilicate, reagent primary alkali silicate B: No. 3 sodium silicate, reagent primary alkali hydroxide C: sodium hydroxide, reagent primary alkali salts D: sodium carbonate, reagent primary E: Sodium sulfate, 〃 〃 F: Sodium aluminate, Reagent primary water reducing agent: Sodium lignin sulfonate, Commercially available product Next, a 4 x 4 x 16 cm specimen was prepared using mortar with the same composition, and heated to 80% at 20°C. Compressive strength and acid resistance tests were conducted when cured at RH. In the acid resistance test, the specimens cured at 20℃ for 7 days were further exposed to an acid aqueous solution of 5% H 2 SO 4 or 5% HCI for 28 hours.
It was soaked for days and expressed as a residual weight percentage (%) relative to the weight before soaking. The results are also listed in Table-1. In addition, binder 360Kg/m 3 , water 153Kg/m 3 , sand
1205Kg/m 3 and gravel 803Kg/m 3 were mixed to make concrete, and the rebound rate was evaluated by dry spraying. Rebound rate is the percentage of shotcrete that falls without adhering to the sprayed surface, and specifically,
The weight of concrete that fell after spraying 10m3 was measured and calculated according to the following formula. Rebound rate (%) = 100 x (weight of fallen concrete / weight of 10m3 of shotcrete)
【表】【table】
【表】
実施例 ２
表−２に示す結合材を用い、実施例１と同様に
乾式吹付工法により１日約10m3ずつ２日間にわた
つてトンネルの吹付工事を行ない、材料のリバウ
ンド率を測定した。結果を表−２に併記する。
耐酸性の評価は実施例１と同様に行つた。[Table] Example 2 Using the binder shown in Table 2, tunnel construction was carried out using the dry spraying method in the same manner as in Example 1, at a rate of approximately 10 m3 per day for two days, and the rebound rate of the material was measured. did. The results are also listed in Table-2. Acid resistance was evaluated in the same manner as in Example 1.
【表】【table】
【表】
実施例 ３
実施例１実験No.１−１〜１−７と実施例２実験
No.２−４〜２−11の結合材を用い、骨材として珪
砂を用い、結合材／骨材比を１／３、結合材／水
比を40％として、４×４×16cmのモルタル供試体
を作製し、耐熱性の試験を行つた。
供試体は、７日間の気乾養生後各温度で３時間
加熱し、その後冷却して圧縮強度を測定した。結
果を表−３に示す。[Table] Example 3 Example 1 Experiment No. 1-1 to 1-7 and Example 2 Experiment
Using binders No. 2-4 to 2-11, using silica sand as the aggregate, setting the binder/aggregate ratio to 1/3, and the binder/water ratio to 40%, make a mortar of 4 x 4 x 16 cm. A specimen was prepared and a heat resistance test was conducted. The specimens were air-dried for 7 days, heated at each temperature for 3 hours, and then cooled to measure compressive strength. The results are shown in Table-3.
【表】【table】
【表】
〈発明の効果〉
本発明のモルタル・コンクリートは、耐酸性や
耐熱性が要求される吹付材として用いればすぐれ
た耐久性を示し、しかも、急結性が大であるので
付着力が強く、材料のリバウンド率の小さい施工
が可能となる。
吹付材の施工法としては、在来の水を吹付先端
で添加する乾式法、骨材を混ぜる段階でミキサー
中で水を添加する湿式法のいずれをも採用するこ
とが可能である。[Table] <Effects of the Invention> The mortar/concrete of the present invention exhibits excellent durability when used as a spray material that requires acid resistance and heat resistance, and has high adhesion strength due to its rapid setting. It is strong and enables construction with a small material rebound rate. As a construction method for spraying materials, it is possible to adopt either the conventional dry method, in which water is added at the tip of the spray material, or the wet method, in which water is added in a mixer at the stage of mixing the aggregate.
Claims (1)
性物質、アルカリ珪酸塩、及びアルカリ水酸化物
からなる結合材と、減水剤、水、並びに骨材を含
有することを特徴とする吹付モルタル・コンクリ
ート組成物。1. A sprayed mortar characterized by containing a binder consisting of a latent hydraulic substance, an alkali silicate, and an alkali hydroxide with a fineness of 2000 cm 2 /g or more, a water reducing agent, water, and aggregate. concrete composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14098982A JPS5930747A (en) | 1982-08-16 | 1982-08-16 | Spraying mortar concrete composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14098982A JPS5930747A (en) | 1982-08-16 | 1982-08-16 | Spraying mortar concrete composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5930747A JPS5930747A (en) | 1984-02-18 |
| JPH0352420B2 true JPH0352420B2 (en) | 1991-08-09 |
Family
ID=15281549
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14098982A Granted JPS5930747A (en) | 1982-08-16 | 1982-08-16 | Spraying mortar concrete composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5930747A (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI69270C (en) * | 1984-09-21 | 1986-01-10 | Metsaeliiton Teollisuus Oy | BRACKBESTAENDIGA TRAEKOMPOSITER SPECIELLT INREDNINGSSKIVOR OCHFOERFARANDE FOER FRAMSTAELLNING AV DESSA |
| JPS61155476A (en) * | 1984-12-27 | 1986-07-15 | Shikoku Kaken Kogyo Co Ltd | Composition for adjusting undercoat |
| JPS61291443A (en) * | 1985-06-19 | 1986-12-22 | 電気化学工業株式会社 | Thermosettable cement composition |
| JP4171200B2 (en) * | 2001-04-18 | 2008-10-22 | 新日本製鐵株式会社 | Method for producing concrete solidified body using steelmaking slag |
| JP3949075B2 (en) * | 2003-04-11 | 2007-07-25 | 電気化学工業株式会社 | Spraying method |
| US9896379B2 (en) | 2015-05-06 | 2018-02-20 | En-Tech Corporation | System and method for making and applying a non-portland cement-based material |
| US10865146B2 (en) | 2015-05-06 | 2020-12-15 | En-Tech Corporation | System and method for making and applying a non-Portland cement-based material |
| JP2019532907A (en) * | 2016-11-04 | 2019-11-14 | エン−テック コーポレーションＥｎ−Ｔｅｃｈ Ｃｏｒｐｏｒａｔｉｏｎ | System and method for preparing and applying non-Portland cement materials |
| JP6347019B1 (en) * | 2017-11-10 | 2018-06-20 | 廣美 畑中 | A method of manufacturing concrete with admixture to prevent deterioration. |
| JP6364579B1 (en) * | 2018-04-03 | 2018-07-25 | 廣美 畑中 | A method for producing an asphalt mixture containing a deterioration inhibitor. |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5229329A (en) * | 1975-08-28 | 1977-03-05 | Daiichi Shokai:Kk | Device for managing pachinko equipment |
| JPS5258728A (en) * | 1975-11-08 | 1977-05-14 | Fudo Construction Co | Method of manufacturing mortar |
-
1982
- 1982-08-16 JP JP14098982A patent/JPS5930747A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5229329A (en) * | 1975-08-28 | 1977-03-05 | Daiichi Shokai:Kk | Device for managing pachinko equipment |
| JPS5258728A (en) * | 1975-11-08 | 1977-05-14 | Fudo Construction Co | Method of manufacturing mortar |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5930747A (en) | 1984-02-18 |
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