JPS6216990B2 - - Google Patents
Info
- Publication number
- JPS6216990B2 JPS6216990B2 JP53075973A JP7597378A JPS6216990B2 JP S6216990 B2 JPS6216990 B2 JP S6216990B2 JP 53075973 A JP53075973 A JP 53075973A JP 7597378 A JP7597378 A JP 7597378A JP S6216990 B2 JPS6216990 B2 JP S6216990B2
- Authority
- JP
- Japan
- Prior art keywords
- dimethyl carbonate
- sodium silicate
- acid
- aqueous solution
- ground
- 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
Links
- 239000004115 Sodium Silicate Substances 0.000 claims description 21
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims description 21
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 21
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 21
- 239000007864 aqueous solution Substances 0.000 claims description 17
- 239000003795 chemical substances by application Substances 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 239000004480 active ingredient Substances 0.000 claims description 5
- 239000002689 soil Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 claims description 3
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 claims description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-L Phosphate ion(2-) Chemical compound OP([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-L 0.000 claims description 2
- 229910052936 alkali metal sulfate Inorganic materials 0.000 claims description 2
- 150000001340 alkali metals Chemical class 0.000 claims description 2
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052921 ammonium sulfate Inorganic materials 0.000 claims description 2
- 235000011130 ammonium sulphate Nutrition 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims description 2
- QAOWNCQODCNURD-UHFFFAOYSA-M hydrogensulfate Chemical compound OS([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-M 0.000 claims description 2
- 239000002075 main ingredient Substances 0.000 claims description 2
- -1 metaborate Chemical compound 0.000 claims description 2
- 150000007522 mineralic acids Chemical class 0.000 claims description 2
- 150000007524 organic acids Chemical class 0.000 claims description 2
- 235000002639 sodium chloride Nutrition 0.000 description 14
- 239000002253 acid Substances 0.000 description 13
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 12
- 150000003839 salts Chemical class 0.000 description 12
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 10
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 9
- 239000011440 grout Substances 0.000 description 9
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 8
- 150000007513 acids Chemical class 0.000 description 7
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 6
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 4
- 235000011054 acetic acid Nutrition 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 4
- 239000011734 sodium Substances 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 3
- WBHQBSYUUJJSRZ-UHFFFAOYSA-M sodium bisulfate Chemical compound [Na+].OS([O-])(=O)=O WBHQBSYUUJJSRZ-UHFFFAOYSA-M 0.000 description 3
- 229910000342 sodium bisulfate Inorganic materials 0.000 description 3
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 2
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 235000015165 citric acid Nutrition 0.000 description 2
- 235000014655 lactic acid Nutrition 0.000 description 2
- 239000004310 lactic acid Substances 0.000 description 2
- 229910000403 monosodium phosphate Inorganic materials 0.000 description 2
- 235000019799 monosodium phosphate Nutrition 0.000 description 2
- 235000011164 potassium chloride Nutrition 0.000 description 2
- 239000001103 potassium chloride Substances 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- AJPJDKMHJJGVTQ-UHFFFAOYSA-M sodium dihydrogen phosphate Chemical compound [Na+].OP(O)([O-])=O AJPJDKMHJJGVTQ-UHFFFAOYSA-M 0.000 description 2
- 239000001488 sodium phosphate Substances 0.000 description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 description 2
- 235000011152 sodium sulphate Nutrition 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-N sodium;hydron;carbonate Chemical compound [Na+].OC(O)=O UIIMBOGNXHQVGW-UHFFFAOYSA-N 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 239000011975 tartaric acid Substances 0.000 description 2
- 235000002906 tartaric acid Nutrition 0.000 description 2
- ZXSQEZNORDWBGZ-UHFFFAOYSA-N 1,3-dihydropyrrolo[2,3-b]pyridin-2-one Chemical compound C1=CN=C2NC(=O)CC2=C1 ZXSQEZNORDWBGZ-UHFFFAOYSA-N 0.000 description 1
- WWILHZQYNPQALT-UHFFFAOYSA-N 2-methyl-2-morpholin-4-ylpropanal Chemical compound O=CC(C)(C)N1CCOCC1 WWILHZQYNPQALT-UHFFFAOYSA-N 0.000 description 1
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 1
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 description 1
- 239000004254 Ammonium phosphate Substances 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 1
- 125000000218 acetic acid group Chemical group C(C)(=O)* 0.000 description 1
- 150000008043 acidic salts Chemical class 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 235000011126 aluminium potassium sulphate Nutrition 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 235000012538 ammonium bicarbonate Nutrition 0.000 description 1
- 239000001099 ammonium carbonate Substances 0.000 description 1
- 229910000148 ammonium phosphate Inorganic materials 0.000 description 1
- 235000019289 ammonium phosphates Nutrition 0.000 description 1
- 229910021538 borax Inorganic materials 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- INQOMBQAUSQDDS-UHFFFAOYSA-N iodomethane Chemical compound IC INQOMBQAUSQDDS-UHFFFAOYSA-N 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 235000011007 phosphoric acid Nutrition 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229960003975 potassium Drugs 0.000 description 1
- 235000007686 potassium Nutrition 0.000 description 1
- 229940050271 potassium alum Drugs 0.000 description 1
- GRLPQNLYRHEGIJ-UHFFFAOYSA-J potassium aluminium sulfate Chemical compound [Al+3].[K+].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O GRLPQNLYRHEGIJ-UHFFFAOYSA-J 0.000 description 1
- 235000015497 potassium bicarbonate Nutrition 0.000 description 1
- 239000011736 potassium bicarbonate Substances 0.000 description 1
- 229910000028 potassium bicarbonate Inorganic materials 0.000 description 1
- CHKVPAROMQMJNQ-UHFFFAOYSA-M potassium bisulfate Chemical compound [K+].OS([O-])(=O)=O CHKVPAROMQMJNQ-UHFFFAOYSA-M 0.000 description 1
- 229910000343 potassium bisulfate Inorganic materials 0.000 description 1
- TYJJADVDDVDEDZ-UHFFFAOYSA-M potassium hydrogencarbonate Chemical compound [K+].OC([O-])=O TYJJADVDDVDEDZ-UHFFFAOYSA-M 0.000 description 1
- 229940086066 potassium hydrogencarbonate Drugs 0.000 description 1
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 description 1
- 229910052939 potassium sulfate Inorganic materials 0.000 description 1
- 235000011151 potassium sulphates Nutrition 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910001958 silver carbonate Inorganic materials 0.000 description 1
- LKZMBDSASOBTPN-UHFFFAOYSA-L silver carbonate Substances [Ag].[O-]C([O-])=O LKZMBDSASOBTPN-UHFFFAOYSA-L 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- NVIFVTYDZMXWGX-UHFFFAOYSA-N sodium metaborate Chemical compound [Na+].[O-]B=O NVIFVTYDZMXWGX-UHFFFAOYSA-N 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- BSVBQGMMJUBVOD-UHFFFAOYSA-N trisodium borate Chemical compound [Na+].[Na+].[Na+].[O-]B([O-])[O-] BSVBQGMMJUBVOD-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Description
本発明は、珪酸塩系グラウトにより地盤を安定
化させる方法に関する。
従来、軟弱地盤を強化したり、漏水地盤を止水
するために種々の薬液を地盤に注入し、地盤中で
硬化させるグラウト工法が知られているが、特に
珪酸ソーダ水溶液と硬化剤の組み合せから成るい
わゆる珪酸塩系グラウトは安価であること、他の
化学グラウトにくらべて公害を起す危険性がない
などの特徴があつて広く実用化されている。
一般に珪酸ソーダ水溶液は強アルカリ性を呈
し、（−）に帯電していて、これに酸，酸性塩あ
るいは金属イオンのような（＋）電荷を加えると
容易に反応して「珪酸ゲル」が析出してゲル化す
る。
このため、従来、珪酸塩系グラウトの硬化剤と
してリン酸，硫酸，酢酸などの酸，リン酸１ナト
リウム，重炭酸ソーダ，酸性硫酸ソーダなどの酸
性塩および塩化カルシウム，硫酸アルミニウム，
硫酸マグネシウム，カリ明バンなどの水溶性金属
塩が用いられている。
本発明は珪酸塩系グラウトにより地盤を安定化
させるに当り、従来とは異なつた硬化剤を用い、
従来よりもすぐれた効果を得ようとするものであ
る。
炭酸ジメチルはヨウ化メチルと炭酸銀を反応さ
せることにより製造され、有機合成原料として有
用な物質であつて、アルカリと反応して炭酸ソー
ダとメタノールを生成する。
したがつて、炭酸ジメチルを珪酸ソーダ水溶液
に添加すると次式にしたがい溶液中のアルカリが
消費されて「珪酸ゲル」が析出する。
Na2O・nSiO2＋（CH3）2CO3＋H2O
→ｎ・SiO2＋Na2CO3＋2CH3OH
本発明者らは炭酸ジメチルのかかる性質に着目
し、これを珪酸塩系グラウトの硬化剤として使用
したところ、意外にもゲル化物が高強度で酸、酸
性塩等の従来の硬化剤を用いた場合にくらべて処
理土壤の強度を格段に大きくすることができるこ
とを見出し、本発明を為すに至つた。
本発明は珪酸ソーダ水溶液を主剤とし、これに
硬化剤として炭酸ジメチルおよび(イ)無機酸，(ロ)ア
ルカリ金属またはアンモニウムの硫酸塩，ホウ酸
塩，メタホウ酸塩，硫酸水素塩，リン酸水素塩，
炭酸水素塩，塩化物，(ハ)有機酸からなる群から選
ばれた少なくとも１種の化合物からなり、硬化剤
全体の量に対して炭酸ジメチルの量が85〜99重量
％の範囲にある混合物の、珪酸ソーダ水溶液中の
有効成分に対して10〜50重量％相当量を配合した
薬液を地盤に注入し、地盤中で硬化させることを
特徴とする土質安定化法を要旨とするものであ
る。
珪酸ソーダ水溶液と炭酸ジメチルを組み合せた
だけでも勿論珪酸ソーダ水溶液は充分ゲル化す
る。
しかし、比較的低濃度の珪酸ソーダ水溶液に少
量の炭酸ジメチルを加えると混合物がゲル化する
のに可成り長時間を要する。この場合、炭酸ジメ
チルのほかに硫酸，リン酸，酢酸，クエン酸，酒
石酸，乳酸のような酸類、あるいは硫酸水素ナト
リウム，重炭酸塩，食塩，塩化カリウムなどの塩
類を適量用いると炭酸ジメチルの有する前記特質
が失われることなく、珪酸ソーダ水溶液のゲル化
を任意に促進させることができる。
たとえば、JIS3号珪酸ソーダ100ml、水100ml、
炭酸ジメチル20％水溶液200ml、酢酸2.0ｇの配合
の薬液は10分後に可成り強固なゲル体を形成す
る。そして、酢酸の量を適宜調節することにより
薬液のゲルタイムを任意にコントロールすること
ができる。
このようなことから本発明においては適宜公知
の酸・塩類等の硬化剤を炭酸ジメチルと併用する
本発明に用いる珪酸ソーダとしては従来珪酸塩
系グラウトに用いられている珪酸ソーダが用いら
れるが、通常はJIS1〜３号珪酸ソーダが好適に用
いられる。
珪酸ソーダは施工時に施工目的に応じた適宜の
濃度の水溶液にするが、グラウト中の有効成分
（Na2O＋SiO2分）の濃度は通常５〜40重量％とす
るのが適当である。
炭酸ジメチルおよびこれと併用する酸類，塩類
の使用量は、目的とするグラウトのゲルタイムに
応じて種々変化させるが、通常合計量として珪酸
ソーダ中の有効成分に対して10〜50重量％かつ、
硬化剤全体の量に対して炭酸ジメチルの量は85〜
99重量％の範囲内で用いられる。
なお、本発明において炭酸ジメチルと併用する
酸類およぴ塩類の好適なものとして、リン酸，硫
酸，ホウ酸，酢酸，酒石酸，クエン酸，乳酸，硫
酸水素ナトリウム，硫酸水素カリウム，硫酸水素
アンモニウム，リン酸１アンモニウム，リン酸１
カリウム，炭酸水素ナトリウム，炭酸水素カリウ
ム，炭酸水素アンモニウム，硫酸ナトリウム，硫
酸カリウム，塩化ナトリウム，塩化カリウム，ホ
ウ酸ナトリウム，メタホウ酸ナトリウムなどが挙
げられる。
地盤安定化の施工は従来と同じであつて、施工
前に珪酸ソーダ水溶液と硬化剤水溶液をそれぞれ
別々に調合し、施工時に両液をＹ字管を用いて混
合して土壌に注入するかまたは両液をその先端に
混合器が設けられた二重注入管に流入させ、先端
部で両液を混合して土壌中に注入する。
次に本発明を実施例を用いて説明する。
実施例
JIS3号珪酸ソーダ（比重1.4，20℃）200mlを採
り、これをＡ液とした。有効成分（Na2O＋
SiO2）は、108ｇであつた。
一方、第１表に記載したような種々の濃度の炭
酸ジメチル単独水溶液および炭酸ジメチルと酸，
酸性塩，中性塩等の混合物水溶液を200mlずつつ
くり、これをＢ液とした。炭酸ジメチルの密度
は、1.065ｇ／mlであつた。
次いで、Ａ，Ｂ両液を等容量ずつ混合して硬化
させた。
Ａ，Ｂ混合液の性状、ゲルタイムおよび硬化物
の圧縮強度を試験した結果を第１表に示す。珪酸
ソーダ水溶液の硬化剤として炭酸ジメチルを単独
で使用したとき、混合物がゲル化するのにかなり
の長時間を要する（実験No.１，２）。
なお、比較のために硫酸，リン酸等の酸および
硫酸水素ナトリウム，リン酸１ナトリウム等の塩
類の単独を珪酸ソーダ水溶液に加え、上記炭酸ジ
メチルを用いた場合と同様のゲルタイムで珪酸ソ
ーダ水溶液をゲル化させようとしたが、これ等酸
および塩類の所定量を珪酸ソーダ水溶液に添加し
た途端に混合物中にゲル化物が生成して実用的な
グラウトが得られなかつた。
The present invention relates to a method for stabilizing ground with silicate grout. Conventionally, grouting methods have been known in which various chemical solutions are injected into the ground and hardened in the ground in order to strengthen soft ground or stop leaking ground. The so-called silicate-based grout is widely put into practical use because of its low cost and less risk of causing pollution than other chemical grouts. Generally, an aqueous sodium silicate solution is strongly alkaline and has a (-) charge, and when a (+) charge such as an acid, an acid salt, or a metal ion is added to it, it easily reacts and a "silicate gel" is deposited. to gel. For this reason, conventional hardening agents for silicate grout include acids such as phosphoric acid, sulfuric acid, and acetic acid, acid salts such as monosodium phosphate, sodium bicarbonate, and acidic sodium sulfate, and calcium chloride, aluminum sulfate,
Water-soluble metal salts such as magnesium sulfate and potassium alum are used. In stabilizing the ground with silicate grout, the present invention uses a hardening agent different from conventional ones,
The aim is to obtain better effects than before. Dimethyl carbonate is produced by reacting methyl iodide and silver carbonate, and is a useful material as a raw material for organic synthesis.It reacts with alkali to produce soda carbonate and methanol. Therefore, when dimethyl carbonate is added to an aqueous sodium silicate solution, the alkali in the solution is consumed and "silicate gel" is precipitated according to the following equation. Na 2 O・nSiO 2 + (CH 3 ) 2 CO 3 +H 2 O →n・SiO 2 +Na 2 CO 3 +2CH 3 OH The present inventors focused on this property of dimethyl carbonate and applied it to silicate grout. When used as a hardening agent, it was unexpectedly discovered that the gelled product has high strength and can significantly increase the strength of treated soil compared to when conventional hardening agents such as acids and acid salts are used. I have come to do this. The present invention uses a sodium silicate aqueous solution as a main ingredient, and dimethyl carbonate as a hardening agent, (a) inorganic acid, (b) alkali metal or ammonium sulfate, borate, metaborate, hydrogen sulfate, hydrogen phosphate. salt,
A mixture consisting of at least one compound selected from the group consisting of hydrogen carbonate, chloride, and (iii) organic acid, in which the amount of dimethyl carbonate is in the range of 85 to 99% by weight based on the total amount of the curing agent. The gist of this soil stabilization method is to inject into the ground a chemical solution containing an amount equivalent to 10 to 50% by weight of the active ingredient in a sodium silicate aqueous solution and harden it in the ground. . Of course, even if the sodium silicate aqueous solution and dimethyl carbonate are simply combined, the sodium silicate aqueous solution can be sufficiently gelled. However, when a small amount of dimethyl carbonate is added to a relatively low concentration sodium silicate aqueous solution, it takes a considerable amount of time for the mixture to gel. In this case, in addition to dimethyl carbonate, if appropriate amounts of acids such as sulfuric acid, phosphoric acid, acetic acid, citric acid, tartaric acid, and lactic acid, or salts such as sodium hydrogen sulfate, bicarbonate, common salt, and potassium chloride are used, dimethyl carbonate has a The gelation of the sodium silicate aqueous solution can be arbitrarily promoted without losing the above properties. For example, 100ml of JIS No.3 silicate soda, 100ml of water,
A chemical solution containing 200 ml of a 20% dimethyl carbonate aqueous solution and 2.0 g of acetic acid forms a fairly strong gel after 10 minutes. By appropriately adjusting the amount of acetic acid, the gel time of the chemical solution can be arbitrarily controlled. For this reason, in the present invention, a curing agent such as a known acid or salt is appropriately used in combination with dimethyl carbonate.As the sodium silicate used in the present invention, sodium silicate, which has been conventionally used in silicate grouts, is used. Usually, JIS No. 1 to 3 sodium silicate is preferably used. During construction, sodium silicate is made into an aqueous solution with an appropriate concentration depending on the purpose of construction, and the concentration of the active ingredient (Na 2 O + SiO 2 min) in the grout is usually 5 to 40% by weight. The amount of dimethyl carbonate and the acids and salts used together with it will vary depending on the desired gel time of the grout, but the total amount is usually 10 to 50% by weight based on the active ingredients in the sodium silicate, and
The amount of dimethyl carbonate relative to the total amount of hardening agent is 85~
Used within the range of 99% by weight. In the present invention, preferable acids and salts used in combination with dimethyl carbonate include phosphoric acid, sulfuric acid, boric acid, acetic acid, tartaric acid, citric acid, lactic acid, sodium hydrogen sulfate, potassium hydrogen sulfate, ammonium hydrogen sulfate, 1 ammonium phosphate, 1 phosphoric acid
Examples include potassium, sodium hydrogen carbonate, potassium hydrogen carbonate, ammonium hydrogen carbonate, sodium sulfate, potassium sulfate, sodium chloride, potassium chloride, sodium borate, and sodium metaborate. Ground stabilization is carried out in the same way as in the past. Before construction, a sodium silicate aqueous solution and a hardening agent aqueous solution are prepared separately, and at the time of construction, both solutions are mixed using a Y-shaped pipe and injected into the soil. Both liquids are made to flow into a double injection tube with a mixer installed at the tip, and both liquids are mixed at the tip and injected into the soil. Next, the present invention will be explained using examples. Example 200 ml of JIS No. 3 sodium silicate (specific gravity 1.4, 20°C) was taken and used as liquid A. Active ingredient (Na 2 O +
SiO 2 ) was 108 g. On the other hand, aqueous solutions of dimethyl carbonate alone and dimethyl carbonate and acid at various concentrations as listed in Table 1,
Each 200ml aqueous solution of a mixture of acidic salts, neutral salts, etc. was prepared and used as Solution B. The density of dimethyl carbonate was 1.065 g/ml. Next, equal volumes of both liquids A and B were mixed and cured. Table 1 shows the results of testing the properties of the mixed liquids A and B, gel time, and compressive strength of the cured product. When dimethyl carbonate was used alone as a curing agent for an aqueous sodium silicate solution, it took a considerable amount of time for the mixture to gel (Experiments Nos. 1 and 2). For comparison, acids such as sulfuric acid and phosphoric acid and salts such as sodium hydrogen sulfate and monosodium phosphate were added alone to a sodium silicate aqueous solution, and the sodium silicate aqueous solution was added at the same gel time as when dimethyl carbonate was used. An attempt was made to gel the grout, but as soon as predetermined amounts of these acids and salts were added to the sodium silicate aqueous solution, a gelled product was formed in the mixture, making it impossible to obtain a practical grout.
【表】【table】
Claims (1)
として炭酸ジメチルおよび(イ)無機酸，(ロ)アルカリ
金属またはアンモニウムの硫酸塩，ホウ酸塩，メ
タホウ酸塩，硫酸水素塩，リン酸水素塩，炭酸水
素塩，塩化物，(ハ)有機酸からなる群から選ばれた
少なくとも１種の化合物からなり、硬化剤全体の
量に対して炭酸ジメチルの量が85〜99重量％の範
囲にある混合物の、珪酸ソーダ水溶液中の有効成
分に対して10〜50重量％相当量を配合した薬液を
地盤に注入し、地盤中で硬化させることを特徴と
する土質安定化法。1 Sodium silicate aqueous solution as main ingredient, dimethyl carbonate as a hardening agent, (a) inorganic acid, (b) alkali metal or ammonium sulfate, borate, metaborate, hydrogen sulfate, hydrogen phosphate, A mixture consisting of at least one compound selected from the group consisting of hydrogen carbonate, chloride, and (iii) organic acid, in which the amount of dimethyl carbonate is in the range of 85 to 99% by weight based on the total amount of the curing agent. A soil stabilization method characterized by injecting into the ground a chemical solution containing an amount equivalent to 10 to 50% by weight of the active ingredient in a sodium silicate aqueous solution and hardening in the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7597378A JPS553450A (en) | 1978-06-24 | 1978-06-24 | Soil stabilization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7597378A JPS553450A (en) | 1978-06-24 | 1978-06-24 | Soil stabilization |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS553450A JPS553450A (en) | 1980-01-11 |
| JPS6216990B2 true JPS6216990B2 (en) | 1987-04-15 |
Family
ID=13591682
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7597378A Granted JPS553450A (en) | 1978-06-24 | 1978-06-24 | Soil stabilization |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS553450A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH049985U (en) * | 1990-05-17 | 1992-01-28 |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7065412B2 (en) * | 2017-11-30 | 2022-05-12 | パナソニックＩｐマネジメント株式会社 | Insulation sheet and its manufacturing method, as well as electronic devices and battery units |
| EP4013765B1 (en) | 2019-08-17 | 2024-02-14 | Prefere Resins Holding GmbH | Multifunctional cyclic organic carbonates as curing agents for organic compounds having phenolic hydroxyl groups |
| EP3786172A1 (en) | 2019-09-02 | 2021-03-03 | Prefere Resins Holding GmbH | Multifunctional cyclic organic carbonates as curing agents for organic compounds having hydroxyl groups |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2164957A1 (en) * | 1971-12-28 | 1973-07-05 | Bayer Ag | Setting silicate solutions - by adding carboxylic esters |
-
1978
- 1978-06-24 JP JP7597378A patent/JPS553450A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2164957A1 (en) * | 1971-12-28 | 1973-07-05 | Bayer Ag | Setting silicate solutions - by adding carboxylic esters |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH049985U (en) * | 1990-05-17 | 1992-01-28 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS553450A (en) | 1980-01-11 |
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