JPH0137343B2 - - Google Patents
Info
- Publication number
- JPH0137343B2 JPH0137343B2 JP9931881A JP9931881A JPH0137343B2 JP H0137343 B2 JPH0137343 B2 JP H0137343B2 JP 9931881 A JP9931881 A JP 9931881A JP 9931881 A JP9931881 A JP 9931881A JP H0137343 B2 JPH0137343 B2 JP H0137343B2
- Authority
- JP
- Japan
- Prior art keywords
- concrete
- slump
- performance water
- salts
- added
- 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
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 31
- 239000004567 concrete Substances 0.000 claims description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000003638 chemical reducing agent Substances 0.000 claims description 15
- 239000004568 cement Substances 0.000 claims description 10
- 150000003839 salts Chemical class 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 7
- 238000002474 experimental method Methods 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- 239000002270 dispersing agent Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000176 sodium gluconate Substances 0.000 description 2
- 235000012207 sodium gluconate Nutrition 0.000 description 2
- 229940005574 sodium gluconate Drugs 0.000 description 2
- KDYFGRWQOYBRFD-UHFFFAOYSA-N succinic acid Chemical compound OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 description 2
- WURBVZBTWMNKQT-UHFFFAOYSA-N 1-(4-chlorophenoxy)-3,3-dimethyl-1-(1,2,4-triazol-1-yl)butan-2-one Chemical compound C1=NC=NN1C(C(=O)C(C)(C)C)OC1=CC=C(Cl)C=C1 WURBVZBTWMNKQT-UHFFFAOYSA-N 0.000 description 1
- CYDQOEWLBCCFJZ-UHFFFAOYSA-N 4-(4-fluorophenyl)oxane-4-carboxylic acid Chemical compound C=1C=C(F)C=CC=1C1(C(=O)O)CCOCC1 CYDQOEWLBCCFJZ-UHFFFAOYSA-N 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-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
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- IVJISJACKSSFGE-UHFFFAOYSA-N formaldehyde;1,3,5-triazine-2,4,6-triamine Chemical compound O=C.NC1=NC(N)=NC(N)=N1 IVJISJACKSSFGE-UHFFFAOYSA-N 0.000 description 1
- NVVZQXQBYZPMLJ-UHFFFAOYSA-N formaldehyde;naphthalene-1-sulfonic acid Chemical compound O=C.C1=CC=C2C(S(=O)(=O)O)=CC=CC2=C1 NVVZQXQBYZPMLJ-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- PSZYNBSKGUBXEH-UHFFFAOYSA-N naphthalene-1-sulfonic acid Chemical compound C1=CC=C2C(S(=O)(=O)O)=CC=CC2=C1 PSZYNBSKGUBXEH-UHFFFAOYSA-N 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000001509 sodium citrate Substances 0.000 description 1
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 description 1
- 239000001540 sodium lactate Substances 0.000 description 1
- 229940005581 sodium lactate Drugs 0.000 description 1
- 235000011088 sodium lactate Nutrition 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 239000001384 succinic acid Substances 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
本発明は、コンクリートのスランプロス防止
法、特に高性能減水剤を添加したコンクリートの
スランプロス防止方法に関する。なお、本発明に
おいて、コンクリートとはモルタル及びコンクリ
ートなどの総称である。
従来から、セメント分散剤はいろいろ知られて
いるが、セメント分散剤の中でも、特にセメント
に多量添加しても、凝結遅延や空気連行などのコ
ンクリートの硬化に悪影響を与えることなく、高
分散性を与えることができる分散剤、いわゆる高
性能減水剤といわれているものは、高強度を要求
されるコンクリート製品、特にパイル、ポール、
等のコンクリート工場製品の製造に添加され償用
されている。又、最近では、高流動化コンクリー
トの製造や高強度のプレストレストコンクリート
トラスなどの場所打ちコンクリートの製造にもそ
の応用範囲が広がつてきている。
しかし、このようなコンクリートは、無添加の
ものに比べて著しくスランプが低下し、とりわけ
低温時においては作業時間が十分とれない欠点が
ある。
本発明は、これらの欠点を解決したもので、高
性能減水剤を配合したコンクリートに微少量のク
エン酸又はその塩類を用いることにより、コンク
リートのスランプの低下（スランプロス）の防止
方法、特に低温時における作業性の改善方法を提
供しようとするものである。
すなわち、本発明は、高性能減水剤を添加した
コンクリートのセメント分に対し、クエン酸又は
その塩類0.005〜0.3重量％添加することを特徴と
する。
以下、さらに詳しく本発明を説明する。まず、
本発明において、高性能減水剤とは前記した性質
を有するものであつて、具体例としては、ナフタ
レンスルホン酸ホルムアルデヒド共縮合物、ナフ
タレンスルホン酸とリグニンスルホン酸ホルムア
ルデヒド共縮合物、メラミンホルムアルデヒド縮
合物のスルホン化物などがあげられ、また、これ
らの市販品としては、花王石鹸(株)商品名「マイテ
イ100」、「マイテイ150」、「マイテイHS」、竹本油
脂(株)商品名「ポールフアイン510N」、山陽国策パ
ルプ(株)商品名「サンフローPS」、ポゾリス物産(株)
商品名「NL―1450」「NL―4000」、昭和電工(株)
商品名「メルメント」などがある。
通常、これらの高性能減水剤は、コンクリート
のセメント分に対して、0.2〜３重量％程度添加
するが、高性能減水剤を添加したコンクリートは
スランプの低下が著しいことから、本発明におい
ては、このような高性能減水剤を添加したコンク
リートのセメント分に対して、クエン酸又はその
塩類を0.005〜0.3重量％を添加することにより、
コンクリートの問題点を解決したものである。
本発明において用いるクエン酸の塩類として
は、ナトリウム、カリウム、リチウム、カルシウ
ム、マグネシウム、亜鉛、ストロンチウム、鉛、
銅、鉄などがあげられる。クエン酸又はその塩類
は、高性能減水剤と併用しないと却つてフローや
スランプの低下を促進させるものである。
本発明において、クエン酸又はその塩類の添加
量を前記のように限定した理由は、コンクリート
中のセメント分に対し0.005重量％未満では、フ
ローやスランプロス防止効果が小さく、また0.3
重量％をこえると強度発現が著しく遅延されるか
らである。
以上説明したように、本発明は、高性能減水剤
を用いたコンクリートのセメント分に対し、極め
て少量のクエン酸又はその塩類を添加するもので
あり、これにより、高性能減水剤を添加したコン
クリートの特性を損うことなく、しかもスランプ
などの低下を防止したすぐれた方法である。
以下実施例をあげて、さらに本発明を説明す
る。
実施例 １
高性能減水剤として、花王石鹸(株)商品名「マイ
テイ150」を使用し、第１表のコンクリート配合
を用い、クエン酸とその塩類を種々変化させ、温
度８℃で50のコンクリートを混練した後そのス
ランプの経時変化と７日強度を測定した。その結
果を第２表に示す。なお実験No.１は比較例であ
る。
The present invention relates to a method for preventing slump loss in concrete, particularly to a method for preventing slump loss in concrete to which a high performance water reducing agent is added. Note that in the present invention, concrete is a general term for mortar, concrete, and the like. Various cement dispersants have been known for a long time, but among cement dispersants, there is one that can achieve high dispersion without adversely affecting the hardening of concrete, such as setting delay or air entrainment, even when added in large amounts to cement. Dispersants that can be added, so-called high-performance water reducers, are used in concrete products that require high strength, especially piles, poles,
It is added to and used in the production of concrete factory products such as. Moreover, recently, the scope of its application has expanded to include the production of highly fluidized concrete and the production of cast-in-place concrete such as high-strength prestressed concrete trusses. However, such concrete has the disadvantage that its slump is significantly lower than that of concrete without additives, and it does not allow sufficient working time, especially at low temperatures. The present invention solves these drawbacks, and is a method for preventing a decrease in concrete slump (slump loss), especially at low temperatures, by using a small amount of citric acid or its salts in concrete mixed with a high-performance water reducing agent. The aim is to provide a method for improving workability during the process. That is, the present invention is characterized in that 0.005 to 0.3% by weight of citric acid or its salts is added to the cement content of concrete to which a high performance water reducing agent has been added. The present invention will be explained in more detail below. first,
In the present invention, the high performance water reducing agent has the properties described above, and specific examples thereof include naphthalene sulfonic acid formaldehyde co-condensate, naphthalene sulfonic acid and lignin sulfonic acid formaldehyde co-condensate, and melamine formaldehyde condensate. Examples of commercially available products include Kao Soap Co., Ltd.'s product names "Mighty 100,""Mighty150," and "Mighty HS," Takemoto Yushi Co., Ltd.'s product name "Pole Huain 510N," Sanyo Kokusaku Pulp Co., Ltd. Product name: “Sunflow PS”, Pozolis Bussan Co., Ltd.
Product name "NL-1450""NL-4000", Showa Denko K.K.
There are product names such as ``Melment''. Normally, these high-performance water reducers are added in an amount of about 0.2 to 3% by weight based on the cement content of concrete, but since concrete to which high-performance water reducers have been added has a significant decrease in slump, in the present invention, By adding 0.005 to 0.3% by weight of citric acid or its salts to the cement content of concrete containing such a high performance water reducer,
This solves the problems of concrete. Citric acid salts used in the present invention include sodium, potassium, lithium, calcium, magnesium, zinc, strontium, lead,
Examples include copper and iron. If citric acid or its salts are not used together with a high performance water reducing agent, it will actually promote a decrease in flow and slump. In the present invention, the reason why the amount of citric acid or its salts added is limited as described above is that if it is less than 0.005% by weight based on the cement content in concrete, the effect of preventing flow and slump loss will be small.
This is because if the weight percentage is exceeded, the development of strength will be significantly delayed. As explained above, the present invention involves adding a very small amount of citric acid or its salts to the cement content of concrete using a high performance water reducer, thereby making the concrete containing a high performance water reducer This is an excellent method that prevents deterioration such as slump without impairing the characteristics of the The present invention will be further explained below with reference to Examples. Example 1 Kao Soap Co., Ltd.'s product name "Mighty 150" was used as a high-performance water reducing agent, the concrete composition shown in Table 1 was used, citric acid and its salts were varied, and 50 concrete was prepared at a temperature of 8°C. After kneading, the change in slump over time and the strength for 7 days were measured. The results are shown in Table 2. Note that Experiment No. 1 is a comparative example.
【表】
第２表では、クエン酸又はその塩類の添加量の
増加に伴ない、フロー低下防止効果が大となり、
７日の強度発現は遅れることを示しているが、材
令28日では740〜750Kgｆ／cm2の強度を発現し、こ
の値は、クエン酸又はその塩類を添加しないもの
とほぼ同等な値となることを確めた。[Table] Table 2 shows that as the amount of citric acid or its salts added increases, the flow reduction prevention effect increases.
Although the strength development on the 7th day is delayed, the strength of 740 to 750 Kgf/ cm2 is developed at the 28th day of age, and this value is almost the same as that without adding citric acid or its salts. I have confirmed that it will happen.
【表】
次に、実施例１のコンクリートにおいて、クエ
ン酸のかわりにグルコン酸ソーダ、乳酸ソーダお
よびコハク酸を用いた場合のスランプ値および７
日圧縮強度を夫々の添加量と共に次の第２表の２
に示す。[Table] Next, in the concrete of Example 1, the slump value and 7
The following Table 2 shows the daily compressive strength and the amount of each additive.
Shown below.
【表】
この表からわかるように、グルコン酸ソーダ、
乳酸ソーダおよびコハク酸を用いた場合には、ス
ランプ値は急激に低下し、特にグルコン酸ソーダ
を0.15及び0.20重量％用いたものは、５〜20分後
に急結し、本発明に比し著しく劣つている。さら
に、実験No.７のコンクリート配合から高性能減水
剤のみを除去して目標スランプ10±２cmのコンク
リート（Ｗ／C38％）を調合したところ、練上直
後8.6cm、20分後3.4cm、40分後０cmとなり、スラ
ンプ低下を促進させた。
実施例 ２
実施例１と同様のコンクリート配合、並びに実
験方法によつて、クエン酸ソーダをセメントに対
し0.15重量％一定添加とし高性能減水剤の種類を
かえて８℃に於けるスランプの経時変化を測定し
た。
その結果を第３表に示す。実験No.26，28，30，
32及び34は比較例である。
尚、スランプを10±２cmに合せるために、コン
クリート混練時の水量を加減した。[Table] As you can see from this table, sodium gluconate,
When sodium lactate and succinic acid were used, the slump value decreased rapidly, and especially when sodium gluconate was used at 0.15 and 0.20% by weight, the slump value rapidly set after 5 to 20 minutes and was significantly lower than that of the present invention. Inferior. Furthermore, when only the high-performance water reducing agent was removed from the concrete mix of Experiment No. 7 to prepare concrete (W/C 38%) with a target slump of 10 ± 2 cm, the results were 8.6 cm immediately after mixing, 3.4 cm after 20 minutes, and 40 cm. After a few minutes, it became 0 cm, and the slump reduction was accelerated. Example 2 Using the same concrete mix and experimental method as in Example 1, we added 0.15% by weight of sodium citrate to the cement and changed the type of high performance water reducer to determine the change in slump over time at 8°C. was measured. The results are shown in Table 3. Experiment No.26, 28, 30,
32 and 34 are comparative examples. In order to adjust the slump to 10±2 cm, the amount of water during concrete mixing was adjusted.
Claims (1)
ント分に対し、クエン酸又はその塩類0.005〜0.3
重量％添加することを特徴とするコンクリートの
スランプロス防止方法。1 Citric acid or its salts 0.005 to 0.3 to the cement content of concrete added with a high performance water reducer.
A method for preventing slump loss in concrete, characterized by adding % by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9931881A JPS582250A (en) | 1981-06-26 | 1981-06-26 | Concrete workability improvement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9931881A JPS582250A (en) | 1981-06-26 | 1981-06-26 | Concrete workability improvement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS582250A JPS582250A (en) | 1983-01-07 |
| JPH0137343B2 true JPH0137343B2 (en) | 1989-08-07 |
Family
ID=14244284
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9931881A Granted JPS582250A (en) | 1981-06-26 | 1981-06-26 | Concrete workability improvement |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS582250A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6183660A (en) * | 1984-09-26 | 1986-04-28 | 三洋化成工業株式会社 | Manufacture of early strength cement product |
| EP0253598A3 (en) * | 1986-07-18 | 1989-05-24 | Lion Corporation | Cement dispersion agent |
-
1981
- 1981-06-26 JP JP9931881A patent/JPS582250A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS582250A (en) | 1983-01-07 |
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