JPH0313185B2 - - Google Patents
Info
- Publication number
- JPH0313185B2 JPH0313185B2 JP61103031A JP10303186A JPH0313185B2 JP H0313185 B2 JPH0313185 B2 JP H0313185B2 JP 61103031 A JP61103031 A JP 61103031A JP 10303186 A JP10303186 A JP 10303186A JP H0313185 B2 JPH0313185 B2 JP H0313185B2
- Authority
- JP
- Japan
- Prior art keywords
- cement
- concrete
- water
- ratio
- wet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000004568 cement Substances 0.000 claims description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 230000029058 respiratory gaseous exchange Effects 0.000 claims description 8
- 239000011396 hydraulic cement Substances 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- 238000001238 wet grinding Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 9
- 239000000463 material Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000010298 pulverizing process Methods 0.000 description 6
- 239000004576 sand Substances 0.000 description 5
- 239000002270 dispersing agent Substances 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 239000004575 stone Substances 0.000 description 4
- 239000011398 Portland cement Substances 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 150000007513 acids Chemical class 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 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 2
- 239000000843 powder Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000011400 blast furnace cement Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- PSZYNBSKGUBXEH-UHFFFAOYSA-N naphthalene-1-sulfonic acid Chemical class C1=CC=C2C(S(=O)(=O)O)=CC=CC2=C1 PSZYNBSKGUBXEH-UHFFFAOYSA-N 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/006—Cement-clinker used in the unground state in mortar - or concrete compositions
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
〔産業上の利用分野〕
本発明はブリージング、強度に優れたコンクリ
ートの製造法に関するものであり、特に水・コン
クリート比(w/c)50〜200%で湿式粉砕して
得られた水硬性セメントスラリーに未粉砕の水硬
性セメントを添加して水・セメント比(w/c)
を25〜60%に調整することを特徴とする耐久性の
優れたコンクリートの製造法に関するものであ
る。
ここで水硬性セメントとしては普通ポルトラン
ドセメント,速硬性セメント,高炉セメントなど
が挙げられるが、最も大量に、また一般的に使用
される普通ポルトランドセメントを例として説明
する。
〔従来の技術〕
最近、コンクリートの耐久性が社会的問題とな
つているが、その大きな原因の一つは骨材の悪化
にある。近頃は骨材として海砂、陸砂、砕石など
が使用されており、川砂、川砂利の様な良質な骨
材は、殆んど枯渇して了い、使用されていないの
が現状である。特によく使用されている海砂は、
塩分除去の為の水洗により微粒分が少なくなつて
おり、また砕石は形態が角張つている為に、コン
クリートの単位水量が増加する傾向にあり、ポン
プ施工の普及,鉄筋量の増大も益々水の多い軟か
いコンクリートを使用する方法にある。之等の現
象はコンクリートのブリージングを増大させコン
クリートの強度,耐久性を低下させる。特に過度
のブリージングは骨材,鉄骨の付着性低下などを
起こし、コンクリートの寿命を低下させる要因と
なる。
之等の対策としては
(1) セメント量の増大による材料分離の低減、
(2) 減水剤の使用による水量の減少、
(3) シリカヒユームの添加による材料分離の低
減、
(4) 粉末骨材(石粉など)の液加による材料分離
の低減、
などが挙げられる。上記(1)のセメント量の増大は
経済性に問題がある上に、コンクリートの乾燥収
縮が大きくなり亀裂の原因となる。上記(2)の減水
剤の使用は、殆んどの場合行なわれているが、そ
れだけでは効果は少ない。上記(3)のシリカヒユー
ムの添加は初期強度を低下させる欠点があり、上
記(4)の微粉末骨材の添加も初期強度の低下を招く
上に、均質な材料を大量に得難いという問題があ
る。
〔発明が解決しようとする問題点〕
以上の様な理由により骨材の悪化に対応する方
法を探索することは極めて重要な問題であり、簡
単な手段で、実用的にブリージングを少なくし、
強度の増大したコンクリートを得ることを目的と
するものである。
〔問題点を解決するための手段〕
本発明者等は上記の問題点について鋭意検討を
重ねた結果、50〜200%の水・セメント比(w/
c)で湿式粉砕したセメントスラリーに、市販の
未粉砕セメントを25〜60%の水・セメント比
(w/c)になる如く混合して練り混ぜることに
より、同一セメント量でブリージングが少なく、
しかも強度の高いコンクリートが得られることを
見出して本発明に到達したものである。
セメントの粉砕法としては乾式と湿式とがある
が、乾式法はボールにセメントがコートされて、
数μまで微粉砕する場合はエネルギーコストが掛
かる。効率的に粉砕するには湿式法が適してお
り、この湿式粉砕については既に特開昭58−
67781号にその例が示されている。但しこの発明
はグラウト材に関するものであつて通常のコンク
リートには適用出来ない。
本発明は水・セメント比(w/c)が50〜200
%で湿式粉砕した後、通常の市販セメントを加え
て水・セメント比(w/c)を25〜60%に調整
し、コンクリートの製造に用いるものである。
〔作用〕
本発明の湿式粉砕によりブリージングが少なく
なるのは微粉砕により凝集力の大きくなつた微粉
末セメントが有効に作用するものと考えられる。
湿式粉砕時の水・セメント比(w/c)は50%以
下では粉砕時に粘度が高くなつて粉砕が困難にな
るし、また200%以上になるとセメントの濃度が
低くなり効率が低下する。またコンクリートを製
造する時に混合する未粉砕のセメントの割合が高
くなりブリージング減少の効果,強度上昇の効果
が減少する。湿式粉砕時の水・セメント比(w/
c)としては70〜150%が最も好ましい範囲であ
る。調整後の最終(w/c)が25%未満になると
粘度の上昇による作業性の悪化、また60%を超え
ると強度の点で好ましくない。
湿式粉砕に際しては分散剤を使用することが好
ましいが、この分散剤としては通常コンクリート
混和剤として用いられているものは使用可能であ
るが、ナフタレンスルホン酸ホルマリン縮合物,
アルキルナフタレンスルホン酸のホルマリン縮合
物,ナフタレンスルホン酸とリグニンスルホン酸
のホルマリン共縮合物,並びにメラミンスルホン
酸ホルマリン縮合物などセメント二次製品に用い
るような高性能分散剤が好適である。
〔実施例〕
下記材料を用い、表に示す配合のコンクリート
を製造した。この際、湿式粉砕セメントは特開昭
58−67781号に記載されている方法に準じ、サン
ドグラインダーを用い、水・セメント比(w/
c)が75%で粉砕した。
コンクリートは可搬傾胴型ミキサーを用い、1
バツチ30のコンクリートを製造した。
使用材料
セメント:普通ポルトランドセメント
細骨材 :海砂
粗骨剤 :岩国産砕石
分散剤 :サンフローPS(山陽国策パルプ(株)
製)
[Industrial Application Field] The present invention relates to a method for producing concrete with excellent breathing and strength, and in particular to hydraulic cement obtained by wet grinding at a water/concrete ratio (w/c) of 50 to 200%. Add unpulverized hydraulic cement to slurry to obtain water/cement ratio (w/c)
The present invention relates to a method for producing concrete with excellent durability, which is characterized by adjusting the amount of concrete to 25 to 60%. Here, examples of hydraulic cement include ordinary Portland cement, quick-hardening cement, blast furnace cement, etc., but ordinary Portland cement, which is used in the largest quantity and most commonly, will be explained as an example. [Prior Art] Recently, the durability of concrete has become a social problem, and one of the major causes is the deterioration of the aggregate. Recently, sea sand, land sand, crushed stone, etc. have been used as aggregates, and high-quality aggregates such as river sand and river gravel have almost been exhausted and are no longer used. . Sea sand is especially commonly used.
Washing to remove salt reduces the amount of fine particles, and crushed stone has an angular shape, so the unit water volume of concrete tends to increase.The spread of pump construction and the increase in the amount of reinforcing bars are also increasing the water volume. The most common method is to use soft concrete. These phenomena increase the breathing of concrete and reduce the strength and durability of concrete. In particular, excessive breathing causes a decline in the adhesion of aggregates and steel frames, which is a factor that shortens the life of concrete. Countermeasures for this include (1) reducing material separation by increasing the amount of cement, (2) reducing the amount of water by using water reducing agents, (3) reducing material separation by adding silica hume, and (4) reducing material separation by adding powdered aggregate ( Examples include reducing material separation by adding liquid (stone powder, etc.). Increasing the amount of cement as described in (1) above is not only economically problematic, but also increases drying shrinkage of concrete, causing cracks. Although water reducing agents (2) above are used in most cases, they alone have little effect. The addition of silica hume in (3) above has the disadvantage of lowering the initial strength, and the addition of fine powder aggregate in (4) above also has the problem of lowering the initial strength and making it difficult to obtain homogeneous material in large quantities. . [Problems to be solved by the invention] For the reasons mentioned above, it is an extremely important problem to find a method to deal with the deterioration of aggregate.
The purpose is to obtain concrete with increased strength. [Means for Solving the Problems] As a result of intensive study on the above problems, the present inventors have determined a water/cement ratio (w/
By mixing and kneading commercially available unpulverized cement into the wet-pulverized cement slurry in step c) at a water/cement ratio (w/c) of 25 to 60%, breathing can be reduced with the same amount of cement.
Moreover, the present invention was achieved by discovering that concrete with high strength can be obtained. There are two methods of crushing cement: dry and wet. In the dry method, balls are coated with cement.
Pulverization to a few microns requires energy costs. A wet method is suitable for efficient pulverization, and this wet method has already been described in Japanese Patent Application Laid-Open No. 1986-
An example is given in No. 67781. However, this invention relates to grout and cannot be applied to ordinary concrete. The present invention has a water/cement ratio (w/c) of 50 to 200.
After wet-pulverizing the concrete at a ratio of 25% to 60%, ordinary commercially available cement is added to adjust the water/cement ratio (w/c) to 25% to 60%, which is then used for the production of concrete. [Effect] The reason why breathing is reduced by the wet grinding of the present invention is thought to be due to the effective effect of the finely powdered cement whose cohesive force is increased by the fine grinding.
If the water/cement ratio (w/c) during wet pulverization is less than 50%, the viscosity increases during pulverization and becomes difficult to pulverize, and if it exceeds 200%, the cement concentration becomes low and efficiency decreases. Furthermore, the proportion of unpulverized cement mixed in when producing concrete increases, reducing the effects of reducing breathing and increasing strength. Water/cement ratio during wet grinding (w/
The most preferable range for c) is 70 to 150%. When the final (w/c) after adjustment is less than 25%, workability deteriorates due to an increase in viscosity, and when it exceeds 60%, it is unfavorable in terms of strength. It is preferable to use a dispersant during wet pulverization. As this dispersant, those normally used as concrete admixtures can be used, but naphthalene sulfonic acid formalin condensate, naphthalene sulfonic acid formalin condensate,
Suitable are high-performance dispersants used in secondary cement products, such as formalin condensates of alkylnaphthalenesulfonic acids, formalin cocondensates of naphthalenesulfonic acids and ligninsulfonic acids, and formalin condensates of melaminesulfonic acids. [Example] Concrete having the composition shown in the table was manufactured using the following materials. At this time, the wet pulverized cement was
According to the method described in No. 58-67781, the water/cement ratio (w/
c) was ground at 75%. Concrete is made using a portable tilting mixer.
Manufactured 30% concrete. Materials used: Cement: Ordinary Portland cement Fine aggregate: Sea sand Coarse aggregate: Crushed stone from Iwakuni Dispersing agent: Sunflow PS (Sanyo Kokusaku Pulp Co., Ltd.)
made)
水・セメント比(w/c)50〜200%で湿式粉
砕したセメントスラリーに特定の割合でセメント
を混合することにより、同一セメント量で次の様
な効果がある。
(1) ブリージングが減少する。
(2) コンクリートの強度特に初期強度が増大す
る。
By mixing cement in a specific ratio to cement slurry wet-pulverized at a water/cement ratio (w/c) of 50 to 200%, the following effects can be achieved with the same amount of cement. (1) Breathing is reduced. (2) Strength of concrete, especially initial strength, increases.
Claims (1)
c)50〜200%で湿式粉砕して得られた水硬性セ
メントスラリーに未粉砕の水硬性セメントを混合
し、水・セメント比(w/c)25〜60%に調整す
ることを特徴とするブリージングが少なく、強度
の増大したコンクリートの製造法。1 Hydraulic cement, water/cement ratio (w/
c) It is characterized by mixing unpulverized hydraulic cement into the hydraulic cement slurry obtained by wet grinding at 50 to 200% and adjusting the water/cement ratio (w/c) to 25 to 60%. A method for producing concrete with less breathing and increased strength.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10303186A JPS62260747A (en) | 1986-05-07 | 1986-05-07 | Manufacture of concrete |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10303186A JPS62260747A (en) | 1986-05-07 | 1986-05-07 | Manufacture of concrete |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS62260747A JPS62260747A (en) | 1987-11-13 |
JPH0313185B2 true JPH0313185B2 (en) | 1991-02-21 |
Family
ID=14343284
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10303186A Granted JPS62260747A (en) | 1986-05-07 | 1986-05-07 | Manufacture of concrete |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS62260747A (en) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5334126A (en) * | 1976-09-13 | 1978-03-30 | Kubota Ltd | Quakeproof pipe joint of inside connection |
JPS569256A (en) * | 1979-06-29 | 1981-01-30 | Ici Ltd | Hydraulic cement composition |
JPS5684349A (en) * | 1979-12-03 | 1981-07-09 | Ici Ltd | Hydraulic cement composition |
JPS5867781A (en) * | 1981-10-19 | 1983-04-22 | Sumitomo Cement Co Ltd | Preparation of grauting material based on ultrafine portland cement |
JPS58199783A (en) * | 1982-05-14 | 1983-11-21 | 住友化学工業株式会社 | Cement structural material |
JPS5935050A (en) * | 1982-08-20 | 1984-02-25 | 太平洋セメント株式会社 | Manufacture of quick-setting portland cement |
JPS60180944A (en) * | 1984-02-29 | 1985-09-14 | 松下電工株式会社 | Manufacture of cement cured body |
-
1986
- 1986-05-07 JP JP10303186A patent/JPS62260747A/en active Granted
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5334126A (en) * | 1976-09-13 | 1978-03-30 | Kubota Ltd | Quakeproof pipe joint of inside connection |
JPS569256A (en) * | 1979-06-29 | 1981-01-30 | Ici Ltd | Hydraulic cement composition |
JPS5684349A (en) * | 1979-12-03 | 1981-07-09 | Ici Ltd | Hydraulic cement composition |
JPS5867781A (en) * | 1981-10-19 | 1983-04-22 | Sumitomo Cement Co Ltd | Preparation of grauting material based on ultrafine portland cement |
JPS58199783A (en) * | 1982-05-14 | 1983-11-21 | 住友化学工業株式会社 | Cement structural material |
JPS5935050A (en) * | 1982-08-20 | 1984-02-25 | 太平洋セメント株式会社 | Manufacture of quick-setting portland cement |
JPS60180944A (en) * | 1984-02-29 | 1985-09-14 | 松下電工株式会社 | Manufacture of cement cured body |
Also Published As
Publication number | Publication date |
---|---|
JPS62260747A (en) | 1987-11-13 |
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