JPS63206341A - Cement accelerator - Google Patents
Cement acceleratorInfo
- Publication number
- JPS63206341A JPS63206341A JP3810687A JP3810687A JPS63206341A JP S63206341 A JPS63206341 A JP S63206341A JP 3810687 A JP3810687 A JP 3810687A JP 3810687 A JP3810687 A JP 3810687A JP S63206341 A JPS63206341 A JP S63206341A
- Authority
- JP
- Japan
- Prior art keywords
- weight
- aluminate
- cement
- calcium
- quick
- 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.)
- Pending
Links
- 239000004568 cement Substances 0.000 title claims description 19
- 239000003795 chemical substances by application Substances 0.000 claims description 21
- 239000011575 calcium Substances 0.000 claims description 18
- 229910052791 calcium Inorganic materials 0.000 claims description 17
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims description 17
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 16
- 229910052783 alkali metal Inorganic materials 0.000 claims description 6
- -1 alkali metal aluminate Chemical class 0.000 claims description 5
- 229910000288 alkali metal carbonate Inorganic materials 0.000 claims description 3
- 150000008041 alkali metal carbonates Chemical class 0.000 claims description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 20
- 239000004567 concrete Substances 0.000 description 15
- 238000005507 spraying Methods 0.000 description 11
- 239000000203 mixture Substances 0.000 description 10
- 229910000029 sodium carbonate Inorganic materials 0.000 description 10
- 235000017550 sodium carbonate Nutrition 0.000 description 10
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 9
- 229910001388 sodium aluminate Inorganic materials 0.000 description 9
- 238000002156 mixing Methods 0.000 description 7
- 238000010276 construction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000004570 mortar (masonry) Substances 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 235000011116 calcium hydroxide Nutrition 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000006072 paste Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- BYFGZMCJNACEKR-UHFFFAOYSA-N Al2O Inorganic materials [Al]O[Al] BYFGZMCJNACEKR-UHFFFAOYSA-N 0.000 description 1
- 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 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910052925 anhydrite Inorganic materials 0.000 description 1
- 150000001669 calcium Chemical class 0.000 description 1
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〈産業上の利用公費〉
本発明は、セメントに添加して用いる乙とによす、セメ
ントペースト、モルタルあるいはコンクリートの初期凝
結、硬化を著しく促進するコンクリート急結剤に関する
。[Detailed Description of the Invention] <Industrial Utilization Public Funds> The present invention relates to a concrete quick-setting agent that is added to cement and significantly accelerates the initial setting and hardening of cement paste, mortar, or concrete. .
〈従来の技術及び、発明が解決しようとする問題点〉
トンネルの天井部や橋台下面等の下向き水平面にセメン
トペースト、モルタルあるいはコンクリートを吹きつけ
て付着させる工法で、吹きつけｔこセメントペースト、
モルタルあるいはコンクリートは、できる限り短時間の
うちに凝結、硬化することが必要とされ、この目的のた
めに、セメントに急結剤が添加されて、使用されている
。<Prior art and problems to be solved by the invention> This is a construction method in which cement paste, mortar, or concrete is sprayed onto a downward horizontal surface such as the ceiling of a tunnel or the bottom surface of an abutment.
Mortar or concrete is required to set and harden in the shortest possible time, and for this purpose, a quick setting agent is added to cement.
との急結剤として、これまで、
（ａ） アルミン酸カルシウム、アルカリ金属の炭酸
塩およびアルカリ金属のアルミン酸塩からなるもの、
（ｂｌ 仮焼明ばん石、アルカリ金属の炭酸塩、アル
カリ金属のアルミン酸塩などからなるもの、
が提案されているが、これらの急結剤は、吹きつけ３０
〜６０秒後に凝結するが、その後１〜１０分間の硬化の
増進が十分とはいえなかった。Up to now, as quick setting agents for It has been proposed that these agents consist of aluminate, etc., but these quick-setting agents are
It set after ~60 seconds, but the curing was not sufficiently enhanced for 1 to 10 minutes thereafter.
トンネルの天井部などに、３０ｃｍＪＪ上の厚さでコン
クリートを吹きつける場合、凝結・硬化開始が早くなけ
ればならないのは勿論であるが、その後の硬化が早く増
進することも又重要で、硬化増進が遅ければ、折角吹き
つけられたコンクリートが剥離してしまうことがある。When spraying concrete to a thickness of 30cm JJ or more on the ceiling of a tunnel, etc., it goes without saying that it must start setting and hardening quickly, but it is also important that the subsequent hardening progresses quickly. If the process is slow, the concrete that has been sprayed may peel off.
本発明のセメント急結剤は、前記のような従来のセメン
ト急結剤の初期硬化増進が不十分である欠点を解決する
ことを、目的としたものである。The purpose of the cement quick-setting agent of the present invention is to solve the above-mentioned drawback that the initial hardening of the conventional cement quick-setting agent is insufficient.
く問題点を解決するための手段〉
前記目的を達成するための本発明の急結剤は、仮焼明ば
ん石とアルミン酸カルシウム又はカルシウムサルフォア
ルミネートを合計量で７０〜８５重量％、アルカリ金属
のアルミン酸塩を７．５〜１５重量％およびアルカリ金
属の炭酸塩を７．５〜１５重量％含有し、かつ前記仮焼
明ばん石とアルミン酸カルシウム又はカルシウムサルフ
ォアルミネートが重量比で４対１〜１対４であることを
特徴とする。Means for Solving the Problems> The quick-setting agent of the present invention for achieving the above object contains calcined alumite and calcium aluminate or calcium sulfoaluminate in a total amount of 70 to 85% by weight, It contains 7.5 to 15% by weight of alkali metal aluminate and 7.5 to 15% by weight of alkali metal carbonate, and the calcined alumite and calcium aluminate or calcium sulfoaluminate are It is characterized by a ratio of 4:1 to 1:4.
本発明に使用する仮焼明ばん石は、アルミニウム明ばん
石又は鉄明ばん石を４００〜８００℃、好ましくは５５
０℃〜７５０℃で焼成、活性化させたものを、粉砕した
ものである。The calcined alumite used in the present invention is aluminum alumite or iron alumite heated to 400 to 800°C, preferably 55°C.
It is fired and activated at 0°C to 750°C and then pulverized.
アルミン酸カルシウムは、３ＣａＯ−Ａｌ２Ｏ３゜１２
Ｃａ０・７Ａｌ、０３．ＣａＯ−Ａｌ２Ｏ，等およびこ
れらのものの混合物を粉砕したものである。Calcium aluminate is 3CaO-Al2O3゜12
Ca0.7Al, 03. CaO-Al2O, etc. and mixtures thereof are ground.
カルシウムサルフォアルミネートは、第１図のＣａ Ｏ
−Ａ Ｉ、 ０３− Ｃａ Ｓ Ｏ４原料配合図中の斜
線範囲を、１２００〜１４００℃で焼成したあと粉砕し
たものである。Calcium sulfoaluminate is CaO in Figure 1.
-A I, 03- The shaded range in the Ca SO4 raw material composition diagram is calcined at 1200 to 1400°C and then pulverized.
アルカリ金属のアルミン酸塩および炭酸塩のアルカリ金
属は、ナトリウム又はカリウムで、これらの塩も粉末で
用いられる。The alkali metal of the alkali metal aluminates and carbonates is sodium or potassium, and these salts are also used in powder form.
く作 用〉
本発明のセメント急結剤は、セメントの凝結初期の硬化
増進に効果の著しいエトリンガイ ト （３ＣａＯ
−Ａｊ２０．、 ３ＣａＳ０４． ３２Ｈ２０）が
、十分に生成析出するように、適当な量と組成のＣａ０
−Ａｊ、０３およびＳＯ３を急結剤中に含有せしめたも
ので、そのため、本発明のセメント急結剤を配合したコ
ンクリートは、吹きつけ施工後極めて短時間で凝結と硬
化が進行する。Effect> The cement quick-setting agent of the present invention contains ettringite (3CaO
-Aj20. , 3CaS04. 32H20) is formed and precipitated in an appropriate amount and composition.
-Aj, 03, and SO3 are contained in the quick-setting agent. Therefore, concrete containing the cement quick-setting agent of the present invention sets and hardens in a very short time after spraying.
く実験例１〉
仮焼明ばん石ニー
６５０℃で仮焼し、ブレーン比表面８１１４０００ｅｊ
／ｇに粉砕したもの。Experimental Example 1 Calcined alumite was calcined at 650℃, and the Blaine specific surface was 8114000ej
/g.
アルミン酸カルシウムニー
Ａ Ｉ、 ０３５１．５部、消石灰（ＣａＯとして４８
．５部）を混合したものを１３５０℃で焼成し、ブレー
ン比表面ｙａ５０００ｃｄ／ｇに粉砕したもの。Calcium aluminate Ni A I, 0351.5 parts, slaked lime (48 as CaO)
．． 5 parts) was baked at 1350°C and ground to a Blaine specific surface ya of 5000 cd/g.
炭酸ナトリウムニー
市販ソーダ灰（Ｎａ２Ｇｏ３９９．５％以上）の０．５
ｍｉ以下のもの。Sodium carbonate commercially available soda ash (Na2Go399.5% or more) 0.5
Anything less than mi.
アルミン酸ナトリウムニー
Ａ ｊ、 ０３５２％、Ｎａ、０３７．９％のもので、
０．５＋ｍ＋ａ以下のもの。Sodium aluminate Aj, 0352%, Na, 037.9%,
0.5+m+a or less.
仮焼明ばん石とアルミン酸カルシウムを、重量比で１対
１混合したもの７０〜９０１１ｉ量％に、アルミン酸ナ
トリウム５〜１５重量％および炭酸ナトリウム５〜１５
重量％を、それぞれ２．５％刻みで混合してなる急結剤
を、セメント２６０ｇにそれぞれ１３ｇ （セメン１−
１００に対し５）および２３．４ｇ（セメント１００に
対し７）添加したものを、標準砂５２０ｇをよく混ぜ合
わせたあと、１１のポリ容器に入れた。これに１６９
ｍｊの水を加えたあと直ちに５ｃｍφの撹拌羽根つき撹
拌機で、１２００ｒｐｍの回転数で６秒間混合したあと
、ポリ容器をタップしてセメントモルタルの表面を平た
くする。注水後１，２，３，４゜５．６，７，１０分後
に、径１／４０ｒｒｉ’のブロクター針を表面より１
ｉｎ貫入し、その時の抵抗値を測定した。その結果をま
とめたのが第２図および第３図である。A 1:1 mixture of calcined alumite and calcium aluminate in a weight ratio of 70 to 9011% by weight, 5 to 15% by weight of sodium aluminate, and 5 to 15% by weight of sodium carbonate.
Add 13g of quick-setting agent to 260g of cement by mixing 2.5% by weight (cemen 1-
5) and 23.4 g (7 per 100 cement) were mixed well with 520 g of standard sand and placed in a plastic container No. 11. 169 for this
Immediately after adding mj of water, the mixture was mixed for 6 seconds at 1200 rpm using a stirrer with a 5 cm diameter stirring blade, and then the surface of the cement mortar was made flat by tapping the plastic container. 1, 2, 3, 4° 5. 6, 7, 10 minutes after water injection, insert a broctor needle with a diameter of 1/40 ri from the surface.
The resistance value at that time was measured. Figures 2 and 3 summarize the results.
これらの図で、仮焼明ばん石とアルミン酸カルシウムの
比１対１の場合、セメントに対する添加率５％では、炭
酸ナトリウム１２．５〜１５ｊｇｉ量％、アルミン酸ナ
トリウム１０〜１５重量％の時、又セメントに対する添
加率７％では、炭酸ナトリウム７．５〜１５重量％、ア
ルミン酸ナトリウム７．５〜１２．５重量％の時、良好
な結果が得られた。In these figures, when the ratio of calcined alumite to calcium aluminate is 1:1, when the addition rate to cement is 5%, sodium carbonate is 12.5 to 15 g % by weight, and sodium aluminate is 10 to 15 wt %. Also, good results were obtained when the addition rate to cement was 7.5 to 15% by weight of sodium carbonate and 7.5 to 12.5% by weight of sodium aluminate.
く実験例２〉
実験例１のアルミン酸カルシウムの代りに、カルシウム
サルフォアルミネートを使用した実験例で、カルシウム
サルフォアルミネートを使用した以外は、すべて実験例
１と同様の方法である。Experimental Example 2 This is an experimental example in which calcium sulfoaluminate was used instead of calcium aluminate in Experimental Example 1, and the method was the same as in Experimental Example 1 except that calcium sulfoaluminate was used.
カルシウムサルフォアルミネートニー
ＡＩ Ｏ３３，２％、消石灰（ＣａＯとして）５４．６
％および無水石膏１２．．３％の粉末を混合して、１３
５０℃で焼成したあと、ブレーン比表面積５０００ｃｊ
／ｇに粉砕したもの。Calcium sulfoaluminate Tony AI O33.2%, slaked lime (as CaO) 54.6
% and anhydrite 12. ．． Mix 3% powder, 13
After firing at 50℃, Blaine specific surface area is 5000cj
/g.
実験例２の結果をまとめたものが、第４図および第５図
である。これらの図から解るように、カルシウムサルフ
ォアルミネートを使用する場合も、アルミン酸カルシウ
ムの場合と同様の結果が得られており、アルカリ金属塩
の配合率が同じ範囲の時に、良い結果となっている。FIGS. 4 and 5 summarize the results of Experimental Example 2. As can be seen from these figures, similar results were obtained when using calcium sulfoaluminate as when using calcium aluminate, and good results were obtained when the blending ratio of the alkali metal salt was within the same range. ing.
く実験例３〉
次に仮焼明ばん石と、アルミン酸カルシウム又は、カル
シウムサルフォアルミネートの比率の影響を調べる実験
を行なった。アルミン酸ナトリウムと炭酸ナトリウムの
４糧の配合割合について、仮焼明ばん石とアルミン酸カ
ルシウム又はカルシウムサルフォアルミネートの配合比
をいろいろ変えて、実験例１および２と同様の実験を行
なった。その結果を第６図および第７図にまとめて示す
。なお、この図はカルシウムサルフォアルミネートを使
用した場合のもので、アルミン酸カルシウムを使用した
場合は、これらの図とほとんど変らない結果が得られた
ので、データの表示を省略した。Experimental Example 3 Next, an experiment was conducted to examine the influence of the ratio of calcined alumite and calcium aluminate or calcium sulfoaluminate. Experiments similar to Experimental Examples 1 and 2 were conducted by varying the blending ratio of the four ingredients of sodium aluminate and sodium carbonate, and the blending ratio of calcined alumite and calcium aluminate or calcium sulfoaluminate. The results are summarized in FIGS. 6 and 7. Note that this figure is for the case where calcium sulfoaluminate was used, and when calcium aluminate was used, results that were almost the same as those in these figures were obtained, so the display of the data was omitted.
これらの図から解るように、仮焼明ばん石とカルシウム
サルフォアルミネート又はアルミン酸カルシウムの配合
比が、１対４〜４対１の時に良い結果となっている。As can be seen from these figures, good results are obtained when the mixing ratio of calcined alumite and calcium sulfoaluminate or calcium aluminate is 1:4 to 4:1.
く実験のまとめ〉
以上をまとめると、本発明のセメント急結剤は、仮焼明
ばん石とアルミン酸カルシウム又はカルシウムサルフォ
アルミネートの合計量で７０〜８５重量％、アルカリ金
属のアルミン酸塩７．５〜１５重量％、アルカリ金属の
炭酸塩７．５〜１５重量％で、かっ仮焼明ばん石とアル
ミン酸カルシウム又はカルシウムサルフォアルミネート
の比が、１対４〜４対１の範囲にあるものが、良好な急
結性をもつことが明確になった。Summary of Experiments> In summary, the cement quick setting agent of the present invention contains 70 to 85% by weight of the total amount of calcined alumite and calcium aluminate or calcium sulfoaluminate, and an alkali metal aluminate. 7.5 to 15% by weight, 7.5 to 15% by weight of alkali metal carbonate, and the ratio of calcined alumite to calcium aluminate or calcium sulfoaluminate is 1:4 to 4:1. It became clear that those within this range had good rapid setting properties.
く実 施 例〉
ｌｄ中、セメント３６０ｋｇ、細砂（ＦＭ２．６０）１
１２０ｋｇ、粗骨材（最大粒径１５關）７５０ｋｇをコ
ンクリートミキサで十分混合して、ドライコンクリート
とした。このドライコンクリートに、セメントに対して
５重量％の下記の組成の急結剤を添加し、よ（混合した
。この混合物を圧気によって吹きつけホースで送り、ホ
ース先端で、この圧送コンクリートに水を加えて練りな
がら、トンネルの天井部に吹きつけた。Example: In ld, cement 360 kg, fine sand (FM2.60) 1
120 kg and 750 kg of coarse aggregate (maximum particle size: 15 mm) were sufficiently mixed in a concrete mixer to obtain dry concrete. To this dry concrete, a rapid setting agent having the composition shown below was added in an amount of 5% by weight based on the cement, and mixed. This mixture was sprayed with pressurized air and sent through a hose. In addition, while kneading it, I sprayed it on the ceiling of the tunnel.
アルミン酸ナトリウム １０ ／／
炭酸ナトリウム １０ ／／
計 １００ 〃
注） このカルシウムサルフォアルミネートは、実験例
に示したと同じもの。Sodium aluminate 10 // Sodium carbonate 10 // Total 100 Note) This calcium sulfoaluminate is the same as shown in the experimental example.
吹きつけは平均約４０ｃｍの厚さに行ない、吹きつけ時
のはねかえり率は１５〜２０％で、吹きつけ後の剥落は
なかった。The spraying was performed to an average thickness of about 40 cm, the bounce rate during spraying was 15 to 20%, and there was no peeling after spraying.
比較のために、仮焼明ばん石８０重量％、アルミン酸ナ
トリウム１０重量％、炭酸ナトリウム１０重量％からな
る従来の急結剤を、前記と同様にコンクリートに混和し
て吹きつけたが、平均約１５ｃｍの吹きつけで剥離が生
じた。このときのはねかえり率は約３０％であった。For comparison, a conventional quick setting agent consisting of 80% by weight of calcined alumite, 10% by weight of sodium aluminate, and 10% by weight of sodium carbonate was mixed with concrete and sprayed in the same manner as above, but the average Peeling occurred after spraying about 15 cm. The bounce rate at this time was about 30%.
〈実施例２〉
ｌｒｎ’中、セメント３６０ｋｇ、細砂（ＦＭ２．８５
）１０９０ｋｇ、粗骨材（最大粒径１５胴）６８０ｋｇ
。<Example 2> In lrn', 360 kg of cement, fine sand (FM2.85
) 1090kg, coarse aggregate (maximum particle size 15 cylinder) 680kg
.
単位水量２１６ｋｇ（セメントに対して６０％）のコン
クリートを生コンクリートミキサで混練後、１０〜３０
分後に吹きつけ機に装入し、圧気によって吹きつけホー
スで送った。吹きつけホースの先端で、との圧送コンク
リートに次に示す組成の急結剤７重量％を、圧気で連続
的に送って混合しながら、トンネルの天井部に吹きつけ
た。After mixing concrete with unit water amount of 216 kg (60% of cement) in a fresh concrete mixer,
After a few minutes, it was loaded into the spray machine and sent through a spray hose with compressed air. Using the tip of a spraying hose, 7% by weight of an quick-setting agent having the composition shown below was sprayed onto the tunnel ceiling while continuously feeding and mixing the concrete with pressurized air.
アルミン酸ナトリウム １２ 〃 炭酸ナトリウム １２ ／／ 製したもの。Sodium aluminate 12 Sodium carbonate 12 // made.
吹きつけは平均約３０ｃｍの厚さであったが、吹きつけ
後の剥落は全くなかった。吹きつけ時のはねかえり率は
約１５％であった。The spraying had an average thickness of about 30 cm, but there was no peeling after spraying. The bounce rate during spraying was about 15%.
比較のため、アルミン酸カルシウム８０重量％、アルミ
ン酸ナトリウム１０重量％、炭酸ナトリウム１０ｉｆｉ
％および、以上針１００に対し硝酸カルシウム５を添加
した従来の急結剤についても、同様の吹きつけを行なっ
たが、平均厚さ約２０ｃｍで剥げ落ちが目立ちはじめた
。はねかえり率は約３０％であった。For comparison, 80% by weight of calcium aluminate, 10% by weight of sodium aluminate, 10ifi of sodium carbonate.
% and a conventional quick-setting agent in which 5 parts of calcium nitrate were added per 100 needles were also sprayed in the same manner, but flaking began to become noticeable at an average thickness of about 20 cm. The bounce rate was about 30%.
〈発明の効果〉
本発明の急結剤によれば、トンネル天井な ・ど下向
き平面部のコンクリートの吹きつけ施工が、容易に確実
にできるので、トンネル工事期間の短縮、工費の節減等
多大の効果がある。<Effects of the Invention> According to the quick-setting agent of the present invention, spraying of concrete on downward-facing flat parts such as tunnel ceilings can be carried out easily and reliably, resulting in significant reductions in tunnel construction period, construction costs, etc. effective.
第１図は、本発明の急結剤に使用するカルシウムサルフ
ォアルミネートの原料配合図、第２図と第３図は、本発
明の実験例１の結果、第４図と第５図は、本発明の実験
例２の結果、第６図と第７図は、本発明の実験例３の結
果を示す図である。
特 許 出 願 人
小野田セメント株式会社
代 理 人Figure 1 is a raw material composition diagram of calcium sulfoaluminate used in the quick setting agent of the present invention, Figures 2 and 3 are the results of Experimental Example 1 of the present invention, and Figures 4 and 5 are , the results of Experimental Example 2 of the present invention, and FIGS. 6 and 7 are diagrams showing the results of Experimental Example 3 of the present invention. Patent applicant: Onoda Cement Co., Ltd. Agent
Claims (1)
ルフォアルミネートを合計量で７０〜８５重量％、アル
カリ金属のアルミン酸塩を７．５〜１５重量％およびア
ルカリ金属の炭酸塩を７．５〜１５重量％含有し、かつ
前記仮焼明ばん石とアルミン酸カルシウム又はカルシウ
ムサルフォアルミネートが重量比で４対１〜１対４であ
ることを特徴とするセメント急結剤。The total amount of calcined alumite and calcium aluminate or calcium sulfoaluminate is 70-85% by weight, alkali metal aluminate 7.5-15% by weight, and alkali metal carbonate 7.5-85% by weight. 15% by weight of a cement quick-setting agent, characterized in that the weight ratio of the calcined alumite to calcium aluminate or calcium sulfoaluminate is 4:1 to 1:4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3810687A JPS63206341A (en) | 1987-02-23 | 1987-02-23 | Cement accelerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3810687A JPS63206341A (en) | 1987-02-23 | 1987-02-23 | Cement accelerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63206341A true JPS63206341A (en) | 1988-08-25 |
Family
ID=12516219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3810687A Pending JPS63206341A (en) | 1987-02-23 | 1987-02-23 | Cement accelerator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63206341A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01294554A (en) * | 1988-05-23 | 1989-11-28 | Nippon Cement Co Ltd | Set accelerating agent for spraying concrete |
| EP0416134A1 (en) * | 1989-03-28 | 1991-03-13 | Onoda Cement Company, Ltd. | Cement hardening accelerator and its production |
| EP0657398A1 (en) * | 1993-12-06 | 1995-06-14 | Sika AG, vorm. Kaspar Winkler & Co. | Process for accelerating the setting and hardening of a material which contains a hydraulic binder, setting and hardening accelerator and use of a mixture for accelerating the setting and hardening |
| EP0779256A1 (en) * | 1995-12-15 | 1997-06-18 | Spie Fondations | Gelation accelerator, injection grout containing it and its use |
| EP1095922A1 (en) | 1999-10-29 | 2001-05-02 | Sika AG, vorm. Kaspar Winkler & Co. | Low viscosity, stabilised set and hardening accelerators |
-
1987
- 1987-02-23 JP JP3810687A patent/JPS63206341A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01294554A (en) * | 1988-05-23 | 1989-11-28 | Nippon Cement Co Ltd | Set accelerating agent for spraying concrete |
| EP0416134A1 (en) * | 1989-03-28 | 1991-03-13 | Onoda Cement Company, Ltd. | Cement hardening accelerator and its production |
| US5160376A (en) * | 1989-03-28 | 1992-11-03 | Onoda Cement Co., Ltd. | Cement setting accelerator and method of manufacturing the same |
| EP0657398A1 (en) * | 1993-12-06 | 1995-06-14 | Sika AG, vorm. Kaspar Winkler & Co. | Process for accelerating the setting and hardening of a material which contains a hydraulic binder, setting and hardening accelerator and use of a mixture for accelerating the setting and hardening |
| CH686513A5 (en) * | 1993-12-06 | 1996-04-15 | Sika Ag | Method of accelerating the setting and setting of a binder and setting and setting accelerators. |
| EP0779256A1 (en) * | 1995-12-15 | 1997-06-18 | Spie Fondations | Gelation accelerator, injection grout containing it and its use |
| FR2742432A1 (en) * | 1995-12-15 | 1997-06-20 | Spie Fondations | RIGIDIFICATION ACCELERATOR, GROUT FOR THE SEALING AND / OR CONSOLIDATION OF SOILS AND BUILDING MATERIALS RELATING TO SUCH ACCELERATOR, METHODS USING SUCH A GROUT |
| EP1095922A1 (en) | 1999-10-29 | 2001-05-02 | Sika AG, vorm. Kaspar Winkler & Co. | Low viscosity, stabilised set and hardening accelerators |
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