JPH0159989B2 - - Google Patents
Info
- Publication number
- JPH0159989B2 JPH0159989B2 JP14240784A JP14240784A JPH0159989B2 JP H0159989 B2 JPH0159989 B2 JP H0159989B2 JP 14240784 A JP14240784 A JP 14240784A JP 14240784 A JP14240784 A JP 14240784A JP H0159989 B2 JPH0159989 B2 JP H0159989B2
- Authority
- JP
- Japan
- Prior art keywords
- general formula
- monomer represented
- acrylic monomer
- concrete
- water
- 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
- 239000004567 concrete Substances 0.000 claims description 43
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 33
- 150000001875 compounds Chemical class 0.000 claims description 19
- 239000000178 monomer Substances 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 17
- 229920003169 water-soluble polymer Polymers 0.000 claims description 15
- 239000004568 cement Substances 0.000 claims description 13
- 125000000217 alkyl group Chemical group 0.000 claims description 9
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 9
- 238000010276 construction Methods 0.000 claims description 7
- 238000006116 polymerization reaction Methods 0.000 claims description 7
- 230000000379 polymerizing effect Effects 0.000 claims description 5
- 229910052783 alkali metal Inorganic materials 0.000 claims description 4
- 150000001340 alkali metals Chemical class 0.000 claims description 4
- 229940088644 n,n-dimethylacrylamide Drugs 0.000 claims description 4
- YLGYACDQVQQZSW-UHFFFAOYSA-N n,n-dimethylprop-2-enamide Chemical compound CN(C)C(=O)C=C YLGYACDQVQQZSW-UHFFFAOYSA-N 0.000 claims description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 125000004433 nitrogen atom Chemical group N* 0.000 claims description 2
- 125000004430 oxygen atom Chemical group O* 0.000 claims description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims 1
- AZGINNVTHJQMPB-UHFFFAOYSA-M sodium;2-methylpropane-1-sulfonate;prop-2-enamide Chemical compound [Na+].NC(=O)C=C.CC(C)CS([O-])(=O)=O AZGINNVTHJQMPB-UHFFFAOYSA-M 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- 238000002156 mixing Methods 0.000 description 9
- 229920002401 polyacrylamide Polymers 0.000 description 6
- 238000004898 kneading Methods 0.000 description 5
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 4
- UVDYBBRVDUKNFV-UHFFFAOYSA-N 2-(prop-2-enoylamino)ethanesulfonic acid Chemical compound OS(=O)(=O)CCNC(=O)C=C UVDYBBRVDUKNFV-UHFFFAOYSA-N 0.000 description 2
- MVYVKSBVZFBBPL-UHFFFAOYSA-N 2-(prop-2-enoylamino)propane-1-sulfonic acid Chemical compound OS(=O)(=O)CC(C)NC(=O)C=C MVYVKSBVZFBBPL-UHFFFAOYSA-N 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
- 239000012736 aqueous medium Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000007334 copolymerization reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- -1 that is Polymers 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- XLPJNCYCZORXHG-UHFFFAOYSA-N 1-morpholin-4-ylprop-2-en-1-one Chemical compound C=CC(=O)N1CCOCC1 XLPJNCYCZORXHG-UHFFFAOYSA-N 0.000 description 1
- RESPXSHDJQUNTN-UHFFFAOYSA-N 1-piperidin-1-ylprop-2-en-1-one Chemical compound C=CC(=O)N1CCCCC1 RESPXSHDJQUNTN-UHFFFAOYSA-N 0.000 description 1
- XNQDKIWPZVPVQD-UHFFFAOYSA-N 2-(2-methylprop-2-enoylamino)ethanesulfonic acid Chemical compound CC(=C)C(=O)NCCS(O)(=O)=O XNQDKIWPZVPVQD-UHFFFAOYSA-N 0.000 description 1
- HKUDVOHICUCJPU-UHFFFAOYSA-N 2-(2-methylprop-2-enoylamino)propane-1-sulfonic acid Chemical compound OS(=O)(=O)CC(C)NC(=O)C(C)=C HKUDVOHICUCJPU-UHFFFAOYSA-N 0.000 description 1
- AKVUWTYSNLGBJY-UHFFFAOYSA-N 2-methyl-1-morpholin-4-ylprop-2-en-1-one Chemical compound CC(=C)C(=O)N1CCOCC1 AKVUWTYSNLGBJY-UHFFFAOYSA-N 0.000 description 1
- RASDUGQQSMMINZ-UHFFFAOYSA-N 2-methyl-1-piperidin-1-ylprop-2-en-1-one Chemical compound CC(=C)C(=O)N1CCCCC1 RASDUGQQSMMINZ-UHFFFAOYSA-N 0.000 description 1
- VSSGDAWBDKMCMI-UHFFFAOYSA-N 2-methyl-2-(2-methylprop-2-enoylamino)propane-1-sulfonic acid Chemical compound CC(=C)C(=O)NC(C)(C)CS(O)(=O)=O VSSGDAWBDKMCMI-UHFFFAOYSA-N 0.000 description 1
- CCIDRBFZPRURMU-UHFFFAOYSA-N 2-methyl-n-propylprop-2-enamide Chemical compound CCCNC(=O)C(C)=C CCIDRBFZPRURMU-UHFFFAOYSA-N 0.000 description 1
- 229920001732 Lignosulfonate Polymers 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 1
- WFKDPJRCBCBQNT-UHFFFAOYSA-N n,2-dimethylprop-2-enamide Chemical compound CNC(=O)C(C)=C WFKDPJRCBCBQNT-UHFFFAOYSA-N 0.000 description 1
- QRWZCJXEAOZAAW-UHFFFAOYSA-N n,n,2-trimethylprop-2-enamide Chemical compound CN(C)C(=O)C(C)=C QRWZCJXEAOZAAW-UHFFFAOYSA-N 0.000 description 1
- JMCVCHBBHPFWBF-UHFFFAOYSA-N n,n-diethyl-2-methylprop-2-enamide Chemical compound CCN(CC)C(=O)C(C)=C JMCVCHBBHPFWBF-UHFFFAOYSA-N 0.000 description 1
- OVHHHVAVHBHXAK-UHFFFAOYSA-N n,n-diethylprop-2-enamide Chemical compound CCN(CC)C(=O)C=C OVHHHVAVHBHXAK-UHFFFAOYSA-N 0.000 description 1
- ZIWDVJPPVMGJGR-UHFFFAOYSA-N n-ethyl-2-methylprop-2-enamide Chemical compound CCNC(=O)C(C)=C ZIWDVJPPVMGJGR-UHFFFAOYSA-N 0.000 description 1
- SWPMNMYLORDLJE-UHFFFAOYSA-N n-ethylprop-2-enamide Chemical compound CCNC(=O)C=C SWPMNMYLORDLJE-UHFFFAOYSA-N 0.000 description 1
- YPHQUSNPXDGUHL-UHFFFAOYSA-N n-methylprop-2-enamide Chemical compound CNC(=O)C=C YPHQUSNPXDGUHL-UHFFFAOYSA-N 0.000 description 1
- WDFKEEALECCKTJ-UHFFFAOYSA-N n-propylprop-2-enamide Chemical compound CCCNC(=O)C=C WDFKEEALECCKTJ-UHFFFAOYSA-N 0.000 description 1
- PSZYNBSKGUBXEH-UHFFFAOYSA-M naphthalene-1-sulfonate Chemical compound C1=CC=C2C(S(=O)(=O)[O-])=CC=CC2=C1 PSZYNBSKGUBXEH-UHFFFAOYSA-M 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000003505 polymerization initiator Substances 0.000 description 1
- 239000007870 radical polymerization initiator Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 150000003458 sulfonic acid derivatives Chemical class 0.000 description 1
- 239000011345 viscous material Substances 0.000 description 1
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Description
産業上の利用分野
本発明は、練り混ぜが容易で、かつ水中打設時
のコンクリート組成材料を防止する混和剤を配合
した水中施工用のコンクリート組成物に関するの
である。
従来の技術
従来、水中にコンクリートを打設する場合、コ
ンクリートが水中に落下していく時、または横に
広がつていく時に水に接触している部分のコンク
リートからセメントペースト部分が洗い出され逸
散し、不均一な組成となるために打設されたコン
クリートの強度が低下するとともに分離したセメ
ントペースト部分が水中に拡散し、水中を著しく
汚濁した。これらの点を解決するために、コンク
リートに混和剤としてセルロース誘導体およびポ
リアクリルアミドすなわちアクリルアミドホモポ
リマーを配合することが開示（ドイツ国特許公開
第2541747号公報）され、その後コンクリート混
和剤としてポリアクリルアミド部分加水分解型化
合物を配合したものが特開昭59−54656号として
開示されている。
発明が解決しようとする問題点
上記従来の技術において、前者は混和剤を含有
しないコンクリートに比べてコンクリートの凝結
が遅れ、特に打設されたコンクリートの初期強度
が低下する欠点があり、後者は凝結の遅れや初期
強度が低下しない点では水中施工用コンクリート
として優れた特性を有しているが、この混和剤も
アクリルアミドホモポリマーと同様セメントに対
して凝集作用が強いためにコンクリートが硬くな
り練り混ぜが困難となり、均一な組成とするため
には練り混ぜに時間を要するばかりでなく、練り
混ぜ機にかかる負荷が大きくなり実用性に欠ける
問題点があつた。
問題点を解決するための手段
上記の問題点を解決するための本発明の手段
は、
一般式（）
（式中R1、R2およびR3は同一かまたは異なつて
水素原子または低級アルキル基を示し、Ｍは水素
原子、アルカリ金属またはアンモニウムを示す。）
で表わされるアクリル系単量体を
一般式（）
（式中、R4は水素原子または低級アルキル基を、
R5およびR6は共に同一かまたは異なつて低級ア
ルキリ基であるかまたは一方が水素で他方が低級
アルキル基を示す。またこのR5とR6とはこれら
が結合する窒素原子と共に酸素原子を介するかま
たは介することなく互いに結合して５または６員
環を形成してもよい。）で表わされるアクリル系
単量体と重合させて得られるアクリル系水溶性高
分子化合物をセメント重量に対して0.1〜４％配
合した水中施工用のコンクリート組成物からなる
ものである。
作 用
本発明に用いられるアクリル系水溶性高分子化
合物の原料として使用する一般式（）で表わさ
れるアクリル系単量体としては２−アクリルアミ
ドエタンスルフオン酸、２−アクリルアミドプロ
パンスルフオン酸、２−アクリルアミド−２−メ
チルプロパンスルフオン酸、２−メタクリルアミ
ドエタンスルフオン酸、２−メタクリルアミドプ
ロパンスルフオン酸、２−メタクリルアミド−２
−メチルプロパンスルフオン酸またはそれらのア
ルカリ金属塩およびアンモニウム塩があげられ
る。
一般式（）で表わされるアクリル系単量体と
してはＮ、Ｎ−ジメチルアクリルアミド、Ｎ、Ｎ
−ジエチルアクリルアミド、Ｎ−アクリロイルピ
ペリジン、Ｎ−アクリロイルモルフオリン、Ｎ、
Ｎ−ジメチルメタクリルアミド、Ｎ、Ｎ−ジエチ
ルメタクリルアミド、Ｎ−メタクリロイルピペリ
ジン、Ｎ−メタクリロイルモルフオリン、Ｎ−メ
チルアクリルアミド、Ｎ−エチルアクリルアミ
ド、Ｎ−プロピルアクリルアミド、Ｎ−メチルメ
タクリルアミド、Ｎ−エチルメタクリルアミドお
よびＮ−プロピルメタクリルアミドがあげられ
る。
本発明に用いられるアクリル系水溶性高分子化
合物の製造は、一般式（）で表わされるアクリ
ル系単量体を一般式（）で表わされるアクリル
系単量体と常法により重合させることによつて行
われ、好適には水系媒体中でラジカル重合開始剤
例えば過酸化物あるいは有機アゾ系化合物を使用
して行われる。重合体の分子量は重合開始剤の種
類および使用量によつて変るが100万以上約2000
万までにすることができる。重合反応を水系媒体
中で行う場合にはアクリル系水溶性高分子化合物
中にカルボキシル基を含有するものが生じること
があるので、重合反応は中性の液性で行うかまた
は低温で行うことが望ましい。
本発明に用いられるアクリル系水溶性高分子化
合物において一般式（）で表わされるアクリル
系単量体の共重合比が増加するにしたがつて本発
明のコンクリート組成物の練り混ぜは容易になる
が、共重合比が著しく高い場合はコンクリート組
成物の水中で分離しない性質および圧縮強度が低
下する傾向にあるので好ましくない。したがつて
重合反応に使用する一般式（）で表わされるア
クリル系単量体の使用モル比率は３〜95％であ
る。
本発明に用いられるアクリル系水溶性高分子化
合物の分子量はコンクリート組成物に水中で分離
しない性質を十分に付与するには高分子量であれ
ば特に問題はないが、好ましくは100万以上であ
る。その添加量はコンクリート組成物のセメント
に対して0.1重量％以上が必要であり、約４重量
％を超えた場合は不経済であるばかりか、取扱い
困難な粘稠物となり、圧縮強度等が低下する。
本発明のコンクリート組成物においてアクリル
系水溶性高分子化合物の配合は、セメントに予め
配合したものを使用しても、生コンクリートに添
加しても、予め水に溶液したものを生コンクリー
トに添加してもよい。その際、コンクリート用分
散剤、例えばメラミンスルフオン酸ホルマリン縮
合物、ナフタリンスルフオン酸ホルマリン縮合物
およびリグニンスルフオン酸塩等のスルフオン酸
誘導体を適量添加してコンクリートの流動性を更
に高めることができる。
実施例
本発明の実施例について以下に詳しく説明す
る。
実施例 １
一般式（）で表わされるアクリル系単量体を
一般式（）で表わされるアクリル系単量体と重
合させて得られる分子量約700万のアクリル系水
溶性高分子化合物を第１表に示すコンクリート中
のセメントに対して１重量％配合し、容量50の
１軸強制練りミキサーで練り混ぜた時の状態を観
察し、練り上つたコンクリートについて水中落下
試験および圧縮強度試験を行つた。
INDUSTRIAL APPLICATION FIELD The present invention relates to a concrete composition for underwater construction that is easy to mix and contains an admixture that prevents concrete composition materials from collapsing during underwater pouring. Conventional technology Conventionally, when concrete is poured underwater, when the concrete falls into the water or spreads laterally, the cement paste part is washed out from the concrete in the area that is in contact with water and is lost. The cement paste dispersed and became non-uniform in composition, reducing the strength of the poured concrete, and the separated cement paste portions also spread into the water, contaminating the water significantly. In order to solve these problems, it has been disclosed (German Patent Publication No. 2541747) that cellulose derivatives and polyacrylamide, that is, acrylamide homopolymer, are added to concrete as admixtures, and then polyacrylamide partially hydrated as concrete admixtures. A compound containing a decomposable compound is disclosed in JP-A-59-54656. Problems to be Solved by the Invention In the above-mentioned conventional techniques, the former has the disadvantage that the setting of concrete is delayed compared to concrete that does not contain an admixture, and the initial strength of concrete that has been placed is particularly reduced; This admixture has excellent characteristics as concrete for underwater construction in that it does not delay the initial strength or reduce initial strength, but like acrylamide homopolymer, this admixture also has a strong cohesive effect on cement, making the concrete hard and difficult to mix. Not only does it take time to knead and mix to obtain a uniform composition, but the load on the kneader increases, making it impractical. Means for solving the problems The means of the present invention for solving the above problems is based on the general formula () (In the formula, R 1 , R 2 and R 3 are the same or different and represent a hydrogen atom or a lower alkyl group, and M represents a hydrogen atom, an alkali metal or ammonium.)
The acrylic monomer represented by the general formula () (In the formula, R 4 is a hydrogen atom or a lower alkyl group,
R 5 and R 6 are both the same or different and are a lower alkyl group, or one is hydrogen and the other is a lower alkyl group. Further, R 5 and R 6 may be bonded to each other with or without an oxygen atom together with the nitrogen atom to which they are bonded to form a 5- or 6-membered ring. ) is a concrete composition for underwater construction containing 0.1 to 4% of an acrylic water-soluble polymer compound obtained by polymerizing with an acrylic monomer, based on the weight of cement. Function Examples of the acrylic monomer represented by the general formula () used as a raw material for the acrylic water-soluble polymer compound used in the present invention include 2-acrylamidoethanesulfonic acid, 2-acrylamidopropanesulfonic acid, 2-acrylamidopropanesulfonic acid, and 2-acrylamidoethanesulfonic acid. -acrylamido-2-methylpropanesulfonic acid, 2-methacrylamidoethanesulfonic acid, 2-methacrylamidopropanesulfonic acid, 2-methacrylamido-2
- Methylpropanesulfonic acid or its alkali metal and ammonium salts. Examples of the acrylic monomer represented by the general formula () include N,N-dimethylacrylamide, N,N
-diethylacrylamide, N-acryloylpiperidine, N-acryloylmorpholine, N,
N-dimethylmethacrylamide, N,N-diethylmethacrylamide, N-methacryloylpiperidine, N-methacryloylmorpholine, N-methylacrylamide, N-ethylacrylamide, N-propylacrylamide, N-methylmethacrylamide, N-ethylmethacryl Amide and N-propyl methacrylamide. The acrylic water-soluble polymer compound used in the present invention can be produced by polymerizing an acrylic monomer represented by the general formula () with an acrylic monomer represented by the general formula () by a conventional method. The polymerization is preferably carried out in an aqueous medium using a radical polymerization initiator such as a peroxide or an organic azo compound. The molecular weight of the polymer varies depending on the type and amount of polymerization initiator used, but it is about 1 million or more and about 2000.
You can do up to 10,000. When the polymerization reaction is carried out in an aqueous medium, some acrylic water-soluble polymer compounds may contain carboxyl groups, so the polymerization reaction should be carried out in a neutral liquid or at a low temperature. desirable. As the copolymerization ratio of the acrylic monomer represented by the general formula () in the acrylic water-soluble polymer compound used in the present invention increases, the mixing of the concrete composition of the present invention becomes easier. If the copolymerization ratio is extremely high, it is not preferable because the property of the concrete composition to not separate in water and the compressive strength tend to decrease. Therefore, the molar ratio of the acrylic monomer represented by the general formula () used in the polymerization reaction is 3 to 95%. The molecular weight of the acrylic water-soluble polymer compound used in the present invention is not particularly problematic as long as it has a high molecular weight to sufficiently impart the property of not separating in water to the concrete composition, but it is preferably 1 million or more. The amount added must be at least 0.1% by weight based on the cement in the concrete composition, and if it exceeds about 4% by weight, it is not only uneconomical but also becomes a viscous substance that is difficult to handle, reducing compressive strength etc. do. In the concrete composition of the present invention, the acrylic water-soluble polymer compound may be mixed in advance with cement, added to ready-mixed concrete, or dissolved in water in advance and added to ready-mixed concrete. It's okay. At that time, the fluidity of concrete can be further enhanced by adding an appropriate amount of a concrete dispersant, such as a melamine sulfonate formalin condensate, a naphthalene sulfonate formalin condensate, and a sulfonic acid derivative such as lignin sulfonate. . Examples Examples of the present invention will be described in detail below. Example 1 Acrylic water-soluble polymer compounds with a molecular weight of about 7 million obtained by polymerizing an acrylic monomer represented by the general formula () with an acrylic monomer represented by the general formula () are shown in Table 1. The mixture was mixed at 1% by weight with respect to the cement in the concrete shown in Figure 1, and the condition was observed when it was mixed in a single-shaft forced mixing mixer with a capacity of 50.The mixed concrete was subjected to an underwater drop test and a compressive strength test.
【表】
水中落下試験はコンクリート供試体を直径が下
部で５cm、上部で７cm、深さ８cmの円錘台形の容
器に満たし、これを予め16cmの深さまで水を満た
した直径20cm、深さ26cmの円筒形容器に、水面上
10cmの位置から自然落下させ、この時の水の濁り
を光電光度計により660ｍμの波長で透過率を測
定した。透過率が高いほど水中に逸散したコンク
リート中のセメント分の量が少なかつたことにな
り、コンクリートの品質の低下が少ないことを意
味する。
圧縮強度試験は練り上つたコンクリートから直
径15cm、高さ30cmの円柱形の供試体を採取し、20
℃の水中で養生し、材令７日および28日に実施し
た。
コンクリートの練り混ぜ状態は３段階で表示し
た。
Ａ：練り混ぜ開始後２分以内に流動性を有する均
一な状態になり、所要のスランプ値が得られ、
練り混ぜ状態は良好である。
Ｂ：練り混ぜ開始後コンクリートは硬くなるが一
時的で、７分以内に流動性を有する均一な状態
になり、所要のスランプ値が得られる。
Ｃ：練り混ぜ開始後コンクリートは凝集して硬く
なり、練り混ぜが困難になる。流動性を有する
均一な状態にするためには少くとも７分以上の
練り混ぜ時間を要し良くしない。
比較のためにアクリル系水溶性高分子化合物を
配合しないコンクリート（プレーンコンクリー
ト）およびポリアクリルアミド（分子量700万）
およびポリアクリルアミド部分加水分解型化合物
（分子量約700万）をセメントに対して１重量％配
合したコンクリートについても同様の試験を行つ
た。
その結果は第２表に示す。[Table] In the underwater drop test, a concrete specimen was filled in a conical trapezoidal container with a diameter of 5 cm at the bottom, 7 cm at the top, and 8 cm deep, and this was filled with water to a depth of 16 cm in advance, 20 cm in diameter and 26 cm deep. in a cylindrical container above the water surface.
The water was allowed to fall naturally from a position of 10 cm, and the transmittance of the turbidity of the water at this time was measured using a photoelectric photometer at a wavelength of 660 mμ. The higher the transmittance, the smaller the amount of cement in the concrete that has escaped into the water, which means that there is less deterioration in the quality of the concrete. For the compressive strength test, a cylindrical specimen with a diameter of 15 cm and a height of 30 cm was taken from the mixed concrete.
The samples were cured in water at ℃ and tested on the 7th and 28th day of age. The mixing state of concrete was displayed in three stages. A: Within 2 minutes after the start of kneading, the mixture becomes fluid and homogeneous, and the required slump value is obtained.
The kneading condition is good. B: After the start of mixing, the concrete becomes hard, but only temporarily; it becomes fluid and homogeneous within 7 minutes, and the required slump value is obtained. C: After the mixing starts, the concrete aggregates and becomes hard, making mixing difficult. In order to obtain a uniform state with fluidity, at least 7 minutes or more of kneading time is required, which is not good. For comparison, concrete without acrylic water-soluble polymer compound (plain concrete) and polyacrylamide (molecular weight 7 million)
Similar tests were also conducted on concrete containing 1% by weight of a partially hydrolyzed polyacrylamide compound (molecular weight approximately 7 million) based on cement. The results are shown in Table 2.
【表】【table】
【表】
実施例 ２
２−アクリルアミド−２−メチルプロパンスル
フオン酸ソーダとＮ、Ｎ−ジメチルアクリルアミ
ドの重合モル比および分子量の異なるアクリル系
水溶性高分子化合物をセメントに対して１重量％
配合したコンクリートについて、実施例１と同様
の試験を行つた。その結果を第３表に示す。[Table] Example 2 Polymerization of sodium 2-acrylamide-2-methylpropanesulfonate and N,N-dimethylacrylamide 1% by weight of acrylic water-soluble polymer compounds with different molecular weights and cement
The same tests as in Example 1 were conducted on the mixed concrete. The results are shown in Table 3.
【表】
実施例 ３
２−アクリルアミド−２−メチルプロパンスル
フオン酸ソーダとＮ、Ｎ−ジメチルアクリルアミ
ドの重合比が50：50モル比の分子量700万のアク
リル系水溶性高分子化合物を第１表に示すコンク
リートに配合し、実施例１と同様の試験を行い、
配合量との関係を第４表に示した。[Table] Example 3 Table 1 shows an acrylic water-soluble polymer compound with a molecular weight of 7 million in which the polymerization ratio of sodium 2-acrylamide-2-methylpropanesulfonate and N,N-dimethylacrylamide is 50:50. It was mixed into the concrete shown in , and the same test as in Example 1 was conducted.
The relationship with the blending amount is shown in Table 4.
【表】
発明の効果
本発明は、上記の手段からなるので、水中にコ
ンクリートを打設してもセメントペースト部分が
分離せず、したがつてコンクリートの強度が低下
せず、水中を汚濁することがない。しかも混和剤
を使用するにもかかわらず凝結遅延や初期強度の
低下がなく、かつ練り混ぜが容易に行えるので、
練り混ぜに長時間を費やすことがなく均一な組成
とすることができ、練り混ぜ機に大きな負担をか
けることもない。[Table] Effects of the Invention Since the present invention comprises the above-mentioned means, even if concrete is placed in water, the cement paste portion will not separate, and therefore the strength of the concrete will not decrease and the water will not be polluted. There is no. Moreover, even though an admixture is used, there is no setting delay or decrease in initial strength, and mixing is easy.
A uniform composition can be obtained without spending a long time on kneading and mixing, and there is no need to place a large burden on the kneading machine.
Claims (1)
て水素原子または低級アルキル基を示し、Ｍは水
素原子、アルカリ金属またはアンモニウムを示
す。）で表わされるアクリル系単量体を 一般式（） （式中、R4は水素原子または低級アルキル基を、
R5およびR6は共に同一かまたは異なつて低級ア
ルキル基であるかまたは一方が水素で他方が低級
アルキル基を示す。またこのR5とR6とはこれら
が結合する窒素原子と共に酸素原子を介するかま
たは介することなく互いに結合して５または６員
環を形成してもよい。）で表わされるアクリル系
単量体と重合させて得られるアクリル系水溶性高
分子化合物をセメント重量の0.1〜４％配合した
水中施工用のコンクリート組成物。 ２ アクリル系水溶性高分子化合物が一般式
（）で表わされるアクリル系単量体を一般式
（）で表わされるアクリル系単量体と重合させ
て得られる分子量100万以上のアクリル系水溶性
高分子化合物である特許請求の範囲第１項記載の
水中施工用のコンクリート組成物。 ３ 一般式（）で表わされるアクリル系単量体
が一般式（） （式中、Ｍは水素原子、アルカリ金属またはアン
モニウムを示す。）で表わされるアクリル系単量
体であり、一般式（）で表わされるアクリル系
単量体が一般式（） （式中、R1は水素または低級アルキル基を示
す。）で表わされるアクリル系単量体である特許
請求の範囲第２項記載の水中施工用のコンクリー
ト組成物。 ４ アクリル系水溶性高分子化合物が一般式
（）で表わされるアクリル系単量体として２−
アクリルアミド−２−メチルプロパンスルフオン
酸ソーダ３〜95モル％を一般式（）で表わされ
るアクリル系単量体としてＮ、Ｎ−ジメチルアク
リルアミド97〜５モル％と重合させて得られる分
子量100万以上のアクリル系水溶性高分子化合物
である特許請求の範囲第１項記載の水中施工用の
コンクリート組成物。[Claims] 1 General formula () (In the formula, R 1 , R 2 and R 3 are the same or different and represent a hydrogen atom or a lower alkyl group, and M represents a hydrogen atom, an alkali metal or ammonium.) formula() (In the formula, R 4 is a hydrogen atom or a lower alkyl group,
R 5 and R 6 are both the same or different and are lower alkyl groups, or one is hydrogen and the other is a lower alkyl group. Further, R 5 and R 6 may be bonded to each other with or without an oxygen atom together with the nitrogen atom to which they are bonded to form a 5- or 6-membered ring. ) A concrete composition for underwater construction containing 0.1 to 4% of the cement weight of an acrylic water-soluble polymer compound obtained by polymerization with an acrylic monomer represented by: 2. An acrylic water-soluble polymer compound with a molecular weight of 1 million or more obtained by polymerizing an acrylic monomer represented by the general formula () with an acrylic monomer represented by the general formula (). The concrete composition for underwater construction according to claim 1, which is a molecular compound. 3 The acrylic monomer represented by the general formula () has the general formula () (In the formula, M represents a hydrogen atom, an alkali metal, or ammonium.) An acrylic monomer represented by the general formula () The concrete composition for underwater construction according to claim 2, which is an acrylic monomer represented by the formula (wherein R 1 represents hydrogen or a lower alkyl group). 4 The acrylic water-soluble polymer compound is 2- as an acrylic monomer represented by the general formula ().
A molecular weight of 1 million or more obtained by polymerizing 3 to 95 mol% of sodium acrylamide-2-methylpropanesulfonate with 97 to 5 mol% of N,N-dimethylacrylamide as an acrylic monomer represented by the general formula () The concrete composition for underwater construction according to claim 1, which is an acrylic water-soluble polymer compound.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14240784A JPS61111951A (en) | 1984-07-11 | 1984-07-11 | Concrete composition for underwater construction |
| PCT/JP1984/000390 WO1985000802A1 (en) | 1983-08-18 | 1984-07-31 | Concrete composition for underwater application |
| EP84902948A EP0162114B1 (en) | 1983-08-18 | 1984-07-31 | Concrete composition for underwater application |
| US06/725,116 US4743301A (en) | 1983-08-18 | 1984-07-31 | Concrete composition for underwater use |
| DE8484902948T DE3480838D1 (en) | 1983-08-18 | 1984-07-31 | CONCRETE COMPOSITION FOR UNDERWATER USE. |
| NO851515A NO851515L (en) | 1983-08-18 | 1985-04-16 | Concrete mix for underwater use. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14240784A JPS61111951A (en) | 1984-07-11 | 1984-07-11 | Concrete composition for underwater construction |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61111951A JPS61111951A (en) | 1986-05-30 |
| JPH0159989B2 true JPH0159989B2 (en) | 1989-12-20 |
Family
ID=15314621
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14240784A Granted JPS61111951A (en) | 1983-08-18 | 1984-07-11 | Concrete composition for underwater construction |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61111951A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6180923B2 (en) * | 2013-12-26 | 2017-08-16 | 花王株式会社 | Admixture for hydraulic composition |
-
1984
- 1984-07-11 JP JP14240784A patent/JPS61111951A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61111951A (en) | 1986-05-30 |
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