JP2010024078A - Admixture - Google Patents
Admixture Download PDFInfo
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- JP2010024078A JP2010024078A JP2008186275A JP2008186275A JP2010024078A JP 2010024078 A JP2010024078 A JP 2010024078A JP 2008186275 A JP2008186275 A JP 2008186275A JP 2008186275 A JP2008186275 A JP 2008186275A JP 2010024078 A JP2010024078 A JP 2010024078A
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- concrete
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- admixture
- specimen
- neutralization
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 17
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims abstract description 9
- 239000001110 calcium chloride Substances 0.000 claims abstract description 9
- 229910001628 calcium chloride Inorganic materials 0.000 claims abstract description 9
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims abstract description 8
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims abstract description 8
- RYAGRZNBULDMBW-UHFFFAOYSA-L calcium;3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Ca+2].COC1=CC=CC(CC(CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O RYAGRZNBULDMBW-UHFFFAOYSA-L 0.000 claims abstract description 8
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims abstract description 8
- RAFRTSDUWORDLA-UHFFFAOYSA-N phenyl 3-chloropropanoate Chemical compound ClCCC(=O)OC1=CC=CC=C1 RAFRTSDUWORDLA-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 claims description 6
- -1 magnesium fluorosilicate Chemical compound 0.000 claims description 5
- 238000006386 neutralization reaction Methods 0.000 abstract description 31
- 230000000694 effects Effects 0.000 abstract description 8
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 abstract description 6
- 238000011161 development Methods 0.000 abstract description 6
- 229910052749 magnesium Inorganic materials 0.000 abstract description 6
- 239000011777 magnesium Substances 0.000 abstract description 6
- 239000007788 liquid Substances 0.000 abstract description 5
- 229920005551 calcium lignosulfonate Polymers 0.000 abstract 1
- 230000005764 inhibitory process Effects 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 28
- 239000004568 cement Substances 0.000 description 15
- 239000000203 mixture Substances 0.000 description 13
- 239000000463 material Substances 0.000 description 11
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- 238000004898 kneading Methods 0.000 description 7
- 239000010802 sludge Substances 0.000 description 7
- 238000002156 mixing Methods 0.000 description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 4
- 230000014509 gene expression Effects 0.000 description 4
- 238000007865 diluting Methods 0.000 description 3
- 230000002401 inhibitory effect Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000001723 curing Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 230000001747 exhibiting effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000009264 composting Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- 150000004674 formic acids Chemical class 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- KJFMBFZCATUALV-UHFFFAOYSA-N phenolphthalein Chemical compound C1=CC(O)=CC=C1C1(C=2C=CC(O)=CC=2)C2=CC=CC=C2C(=O)O1 KJFMBFZCATUALV-UHFFFAOYSA-N 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
- 239000002349 well water Substances 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
本発明は、混和剤にかかり、更に詳しくは、モルタルやコンクリートの強度向上に寄与すると共に中性化防止に寄与する混和剤に関する。 The present invention relates to an admixture, and more particularly relates to an admixture that contributes to improving the strength of mortar and concrete and also prevents neutralization.
土木或いは建築の分野においては、構造物などの構築の材料としてコンクリートが使用されている。コンクリートの強度は水セメント比によって左右され、この値が大きいほど強度、耐久性、水密性が劣るといわれている。従ってコンクリートの強度を向上させようとすれば水セメント比を小さくすればよい。 In the field of civil engineering or architecture, concrete is used as a construction material such as a structure. The strength of concrete depends on the water-cement ratio, and it is said that the greater the value, the lower the strength, durability, and watertightness. Therefore, if it is going to improve the intensity | strength of concrete, what is necessary is just to make a water cement ratio small.
また、近年、コンクリートの耐久性問題、特にコンクリートの中性化が大きくクローズアップされている。コンクリートの中性化は、大気中の二酸化炭素がコンクリート内に侵入し、炭酸化反応を引き起こすことにより、本来アルカリ性であるコンクリートのｐＨを下げる現象である。 In recent years, the durability of concrete, particularly the neutralization of concrete, has been greatly highlighted. The neutralization of concrete is a phenomenon that lowers the pH of concrete that is essentially alkaline by the carbon dioxide in the atmosphere entering the concrete and causing a carbonation reaction.
中性化はコンクリート表面より進行し、鉄筋などの鋼材位置に達すると、不動態被膜を破壊する。これにより鋼材を腐食させ、コンクリートのひび割れ・剥離を引き起こし、耐荷力など構造物の性能低下を生じる。また、ひび割れが発生したコンクリートはさらに二酸化炭素の侵入を促すため、中性化によるコンクリート構造物の劣化を加速させる。 Neutralization proceeds from the concrete surface, and when it reaches the position of a steel material such as a reinforcing bar, the passive film is destroyed. As a result, the steel material is corroded, cracking and peeling of the concrete are caused, and the performance of the structure such as load resistance is deteriorated. In addition, since the cracked concrete further promotes the penetration of carbon dioxide, it accelerates the deterioration of the concrete structure due to neutralization.
従って、水セメント比の小さい密実なコンクリートは、コンクリートの強度を向上させると共にコンクリートの劣化因子である二酸化炭素の侵入を抑える効果がある。 Therefore, a solid concrete having a small water-cement ratio has an effect of improving the strength of the concrete and suppressing the intrusion of carbon dioxide, which is a deterioration factor of the concrete.
しかし、水セメント比を小さくすればコンクリートやモルタルの流動性が悪くなり、打設作業効率の低下と強度のばらつきが大きくなるばかりか、建設時のコスト増を招く課題がある。 However, if the water-cement ratio is reduced, the fluidity of concrete and mortar deteriorates, and there is a problem that not only the work efficiency is lowered and the variation in strength is increased, but also the cost during construction is increased.
特許文献１には、高炉徐冷スラグ粉末とギ酸類とを含有してなり、コンクリートの強度発現と中性化抑制効果を奏するセメント混和材が開示されている。 Patent Document 1 discloses a cement admixture containing blast furnace slow-cooled slag powder and formic acids, and exhibiting the strength development of concrete and the effect of inhibiting neutralization.
特許文献１に開示されている混和材の原料である高炉徐冷スラグは、高炉から生成する溶融スラグを空冷と適度の散水によって塊状化させたものであり、コンクリート用粗骨材やセメント原料等として使用されているが、塊状であるために必ずしも使い勝手がよいというものではない。 The blast furnace slow-cooled slag which is a raw material of the admixture disclosed in Patent Document 1 is obtained by agglomeration of molten slag generated from the blast furnace by air cooling and appropriate water spray, such as coarse aggregate for concrete, cement raw material, etc. However, it is not necessarily easy to use because it is in a lump shape.
本発明者はコンクリートの強度発現と中性化抑制効果を奏する液状の混和剤を開発すべく研究を重ね、リグニンスルホン酸カルシウム、塩化カルシウム、亜硝酸カルシウムにヒドロキシエチルセルロースを加え、更にケイフッ化マグネシウムを加えることによって水セメント比を小さくしないでもコンクリートの強度発現と中性化抑制効果を奏することを知見し、本発明を完成するに至った。 The present inventor has repeatedly studied to develop a liquid admixture that exhibits the strength development and neutralization suppressing effect of concrete, adding hydroxyethyl cellulose to calcium lignin sulfonate, calcium chloride and calcium nitrite, and further adding magnesium silicofluoride. It has been found that the addition of the water cement ratio does not reduce the water cement ratio, and the concrete exhibits the strength development and the neutralization suppressing effect, thereby completing the present invention.
（本発明の目的）
そこで本発明の目的は、モルタル又はコンクリートの強度発現と中性化抑制効果を奏する液状の混和剤を提供することにある。
(Object of the present invention)
Accordingly, an object of the present invention is to provide a liquid admixture that exhibits the strength development and neutralization suppressing effect of mortar or concrete.
上記課題を解決するために本発明が講じた手段は次のとおりである。
本発明は、リグニンスルホン酸カルシウム、塩化カルシウム、亜硝酸カルシウム、ヒドロキシエチルセルロース、ケイフッ化マグネシウム、水を含む混和剤である。
Means taken by the present invention to solve the above problems are as follows.
The present invention is an admixture containing calcium lignin sulfonate, calcium chloride, calcium nitrite, hydroxyethyl cellulose, magnesium fluorosilicate, and water.
本発明は、リグニンスルホン酸カルシウム５〜２０重量部、塩化カルシウム１〜１０重量部、亜硝酸カルシウム１〜５重量部、ヒドロキシエチルセルロース３〜５重量部、ケイフッ化マグネシウム３〜５重量部、水８０〜９０重量部を含む混和剤である。 The present invention comprises 5 to 20 parts by weight of calcium lignin sulfonate, 1 to 10 parts by weight of calcium chloride, 1 to 5 parts by weight of calcium nitrite, 3 to 5 parts by weight of hydroxyethyl cellulose, 3 to 5 parts by weight of magnesium fluorosilicate, and 80 water. An admixture containing ˜90 parts by weight.
本発明は、前記混和剤を用いるモルタル又はコンクリートの製造方法である。 The present invention is a method for producing mortar or concrete using the admixture.
本発明は、前記混和剤を含むモルタル又はコンクリート製品である。 The present invention is a mortar or concrete product containing the admixture.
本発明によれば、モルタル又はコンクリートの強度発現と中性化抑制効果を奏する液状の混和剤が提供できる。
また、モルタル又はコンクリートの強度発現と中性化抑制効果を奏するコンクリートの製造方法が提供できる。
更には、モルタル又はコンクリートの強度発現と中性化抑制効果を奏するコンクリート製品が提供できる。
ADVANTAGE OF THE INVENTION According to this invention, the liquid admixture which shows the strength expression and neutralization inhibitory effect of mortar or concrete can be provided.
Moreover, the manufacturing method of the concrete which has the strength expression and neutralization inhibitory effect of mortar or concrete can be provided.
Furthermore, it is possible to provide a concrete product exhibiting strength development and neutralization suppressing effect of mortar or concrete.
本発明で使用しているリグニンスルホン酸は、セメントの凝結を遅らせる遅延剤として知られている。塩化カルシウムは凝結、硬化を促進させる促進剤として使用されている他、コンクリートの吸水性または透水性を減ずる目的で使用される防水剤の主成分としても使用されている。 The lignin sulfonic acid used in the present invention is known as a retarder that delays the setting of cement. Calcium chloride is used as an accelerator for accelerating setting and hardening, and also as a main component of a waterproofing agent used for the purpose of reducing the water absorption or water permeability of concrete.
混和剤は、リグニンスルホン酸カルシウム５〜２０重量部、塩化カルシウム１〜１０重量部、亜硝酸カルシウム１〜５重量部、ヒドロキシエチルセルロース３〜５重量部、ケイフッ化マグネシウム３〜５重量部、水８０〜９０重量部を含む組成からなるのが好ましい。これらの数値は数々の実験結果と経験則から導き出されたものである。 The admixture is 5 to 20 parts by weight of calcium lignin sulfonate, 1 to 10 parts by weight of calcium chloride, 1 to 5 parts by weight of calcium nitrite, 3 to 5 parts by weight of hydroxyethyl cellulose, 3 to 5 parts by weight of magnesium silicofluoride, 80 of water. It preferably comprises a composition containing ~ 90 parts by weight. These numbers are derived from numerous experimental results and empirical rules.
後述するように、ケイフッ化マグネシウムを配合しない混和剤でもＪＩＳ規格による配合のコンクリートよりも強度が向上する。しかし、ケイフッ化マグネシウムを配合することによって飛躍的に強度が向上する。その理由は今のところ明らかではない。 As will be described later, even an admixture that does not contain magnesium silicofluoride is improved in strength as compared with concrete blended according to JIS standards. However, the strength is dramatically improved by blending magnesium silicofluoride. The reason is not clear so far.
本発明で使用する水としては、井戸水、雨水、水道水等が使用されるが、混入物がない蒸留水が好ましい。 As the water used in the present invention, well water, rain water, tap water or the like is used, but distilled water free from contaminants is preferable.
本発明の混和剤は、コンクリートの練り混ぜに使用する水（以下「混練水」という。）に希釈して使用することができるので使い勝手がよい。 Since the admixture of the present invention can be used after being diluted with water used for kneading concrete (hereinafter referred to as “kneading water”), it is easy to use.
本発明の混和剤は、セメントペースト、モルタル、またはコンクリートに使用できる。
本発明に係る混和剤の使用分野としては、主として土木・建築の分野である。
The admixture of the present invention can be used for cement paste, mortar, or concrete.
The field of use of the admixture according to the present invention is mainly the field of civil engineering and architecture.
本発明にかかるモルタル又はコンクリートの製造方法は、本発明にかかる混和剤を用いる他は従来からあるモルタル又はコンクリートの製造方法に適用できるため、説明を省略する。 Since the manufacturing method of the mortar or concrete concerning this invention can be applied to the conventional manufacturing method of mortar or concrete except using the admixture concerning this invention, description is abbreviate | omitted.
本発明にかかるモルタル又はコンクリート製品は、本発明にかかる混和剤を用いる他は従来からあるモルタル又はコンクリート製品に適用でき、その製造も従来の製造方法で製造できるために説明を省略する。 The mortar or concrete product according to the present invention can be applied to a conventional mortar or concrete product except that the admixture according to the present invention is used, and the description thereof is omitted because it can be manufactured by a conventional manufacturing method.
本発明を実施例に基づき詳細に説明する。 The present invention will be described in detail based on examples.
リグニンスルホン酸カルシウム ２０重量部
塩化カルシウム ６重量部
亜硝酸カルシウム ５重量部
ヒドロキシエチルセルロース ６重量部
ケイフッ化マグネシウム ５重量部
蒸留水 ８５重量部
を容器にいれ撹拌して液状の混和剤を得た。なお、配合の順序や撹拌速度などは特段限定するものではなく、常法で十分である。この混和剤の色は茶褐色であり、水よりやや粘性を有する。
Calcium lignin sulfonate 20 parts by weight Calcium chloride 6 parts by weight Calcium nitrite 5 parts by weight Hydroxyethyl cellulose 6 parts by weight Magnesium fluorosilicate 5 parts by weight Distilled water 85 parts by weight were placed in a container and stirred to obtain a liquid admixture. In addition, the order of mixing and the stirring speed are not particularly limited, and conventional methods are sufficient. The color of this admixture is brown and has a slightly higher viscosity than water.
試験例１ 強度試験(1)
実施例１で得られた混和剤のコンクリート強度発現性について、コンクリート強度試験用供試体（以下「供試体」という。）の圧縮強度試験を行った。
供試体は、実施例１で得られた混和剤を混練水に１００倍に希釈した混練水Ａ１６３リットルを調整し、一般的なＪＩＳ規格のコンクリート（標準配合）のセメント、骨材配合（１ｍ3）と混ぜ合わせ、材齢７日の供試体Ａを製造した。供試体Ａの寸法は、φ１０×２０ｃｍの円柱形である。
Test example 1 Strength test (1)
The concrete strength testability of the admixture obtained in Example 1 was subjected to a compressive strength test of a concrete strength test specimen (hereinafter referred to as “test specimen”).
The test specimen was prepared by adjusting 163 liters of kneaded water A obtained by diluting the admixture obtained in Example 1 into kneaded water 100 times, and mixing JIS standard concrete (standard blend) cement and aggregate (1 m 3). ), And a specimen A having a material age of 7 days was produced. The dimension of the specimen A is a cylindrical shape of φ10 × 20 cm.
供試体Ａの配合
・セメント ２９６ｋｇ
・混練水Ａ １６３リットル
・細骨材 ７８０ｋｇ
・粗骨材 １０９４ｋｇ
Composition of specimen A-Cement 296kg
-Kneading water A 163 liters-Fine aggregate 780kg
・ Coarse aggregate 1094kg
比較のために二つの供試体を準備した。一つは一般的なＪＩＳ規格のコンクリート（標準配合）の配合（１ｍ3）で材齢７日、φ１０×２０ｃｍの円柱形の供試体Ｓである。 Two specimens were prepared for comparison. One is a columnar specimen S of φ10 × 20 cm with a composition (1 m 3 ) of general JIS standard concrete (standard blend) and a material age of 7 days.
供試体Ｓの配合
・セメント ２９６ｋｇ
・水 １６３リットル
・細骨材 ７８０ｋｇ
・粗骨材 １０９４ｋｇ
Composition of specimen S ・ Cement 296kg
・ 163 liters of water ・ fine aggregate 780 kg
・ Coarse aggregate 1094kg
他の一つは、実施例１の混和剤の組成からケイフッ化マグネシウムを除きその他は実施例１と同じ組成の混和剤を混練水に１００倍に希釈した混練水Ｂ１６３リットルを調整し、供試体Ａと同様の配合で供試体Ｂを製造した（混練水Ａを混練水Ｂに置換したものである。）。 The other one was prepared by adjusting 163 liters of the kneaded water B obtained by diluting the admixture of the same composition as in Example 1 with the kneaded water 100 times except for the magnesium silicofluoride from the composition of the admixture of Example 1. Specimen B was produced with the same composition as A (kneaded water A was replaced with kneaded water B).
試験はＪＩＳ Ａ １１３２ならびに圧縮強度万能試験機１００ｔ（島津製作所）等ＪＩＳに規定する試験方法で行い、供試体Ａは１回、供試体Ｂ，Ｓについては二回行った。
圧縮強度試験の結果を表１に示す。
The test was conducted by a test method prescribed in JIS such as JIS A 1132 and a compressive strength universal testing machine 100t (Shimadzu Corporation), and specimen A was conducted once and specimens B and S were conducted twice.
The results of the compressive strength test are shown in Table 1.
表１から明らかなように、通常の混練水を使用した供試体Ｓの圧縮強度が１０．１Ｎ／mm2（平均）であるのに対して、混練水Ａを使用した供試体Ａの圧縮強度は３４．６Ｎ／mm2 であり、略３倍の強度向上が発現できた。
なお、混練水Ｂを使用した供試体Ｂの圧縮強度は１２．６Ｎ／mm2（平均）であり、混練水Ａを使用した供試体Ａの圧縮強度より小さいが、通常の混練水を使用した供試体Ｓの圧縮強度よりも大きい。
As is evident from Table 1, the compressive strength of the specimen A compressive strength of the specimen S using a conventional kneading water whereas is 10.1N / mm 2 (average), using mixing water A Was 34.6 N / mm 2 , and an approximately three-fold improvement in strength could be realized.
The compressive strength of the specimen B using the kneaded water B is 12.6 N / mm 2 (average), which is smaller than the compressive strength of the specimen A using the kneaded water A, but normal kneaded water was used. It is larger than the compressive strength of the specimen S.
試験例２ 強度試験(2)
活性汚泥法で廃水を処理する際に生じる余剰汚泥は、現在は投棄や堆肥化等で処理されているが、何れも問題がある。余剰汚泥をコンクリートの骨材として使用できれば、新たな処理方法となるが、その際に問題となるのは得られたコンクリートの強度である。
Test example 2 Strength test (2)
Excess sludge produced when wastewater is treated by the activated sludge method is currently treated by dumping or composting, but all have problems. If excess sludge can be used as the aggregate of concrete, it becomes a new treatment method, but the problem is the strength of the obtained concrete.
そこで、実施例１で得られた混和剤のコンクリート強度発現性について、汚泥を骨材の一部に使用した供試体の圧縮強度試験を行った。
混練水Ａを使用し、セメントや他の骨材と混ぜ合わせて材齢６日の供試体ａを製造した。供試体ａの寸法は、φ１０×２０ｃｍの円柱形である。
なお、汚泥は脱水し乾燥させたものを使用した。
Then, the compressive strength test of the specimen which used sludge for some aggregates was done about the concrete strength expressibility of the admixture obtained in Example 1.
A kneaded water A was used and mixed with cement and other aggregates to produce a specimen a having a material age of 6 days. The dimension of the specimen a is a cylindrical shape of φ10 × 20 cm.
The sludge was dehydrated and dried.
供試体ａの配合
・セメント ６７２ｇ
・砂 ３０３ｇ
・砂利 ２０１８ｇ
・乾燥汚泥 ７２０ｇ
・混練水Ａ ３３０ｇ
Composition of specimen a ・ Cement 672g
・ Sand 303g
・ Gravel 2018 g
・ Dry sludge 720g
・ Kneading water A 330g
比較のために二つの供試体を準備した。一つは供試体ａと同じ配合で、混練水Ａの代わりに通常の水を混練水として使用した、材齢７日、φ１０×２０ｃｍの円柱形の供試体ｓである。 Two specimens were prepared for comparison. One is a cylindrical specimen s having a material age of 7 days and a diameter of 10 × 20 cm, in which normal water is used instead of the kneaded water A as the kneaded water.
他の一つは、供試体ａと同じ配合配合で、混練水Ａの代わりに混練水Ｂを使用した、材齢７日、φ１０×２０ｃｍの円柱形の供試体ｂである。
圧縮強度試験の結果を表２に示す。
The other is a cylindrical specimen b having a material age of 7 days and a φ10 × 20 cm in which the kneading water B is used in place of the kneading water A with the same blending composition as the specimen a.
The results of the compressive strength test are shown in Table 2.
表２から明らかなように、通常の混練水を使用した供試体ｓの圧縮強度が９．５５Ｎ／mm2であるのに対して、混練水Ａを使用した供試体ａの圧縮強度は２３．７Ｎ／mm2 であり、略２倍以上の強度向上が発現できた。 As is clear from Table 2, the compressive strength of the specimen s using normal kneaded water is 9.55 N / mm 2 , whereas the compressive strength of the specimen a using kneaded water A is 23. The strength was 7 N / mm 2 , and a strength improvement of about twice or more could be realized.
なお、混練水Ｂを使用した供試体ｂの圧縮強度は１２．６Ｎ／mm2であり、混練水Ａを使用した供試体ａの圧縮強度より小さいが、通常の混練水を使用した供試体ｓの圧縮強度よりも大きい。従って、本発明にかかる混和剤を使用することによって、汚泥をコンクリートの骨材として使用できることがわかった。 The compressive strength of the specimen b using the kneaded water B is 12.6 N / mm 2, which is smaller than the compressive strength of the specimen a using the kneaded water A, but the specimen s using ordinary kneaded water is used. Greater than the compressive strength. Therefore, it was found that sludge can be used as a concrete aggregate by using the admixture according to the present invention.
試験例３ 中性化試験
中性化試験としては、コンクリートの供試体を自然条件下においてその中性化の進行状況を調べる方法、コンクリートの炭酸ガスによる促進試験等がある。
Test Example 3 Neutralization test As a neutralization test, there are a method for examining the progress of neutralization of a concrete specimen under natural conditions, a concrete acceleration test using carbon dioxide gas, and the like.
ここでは、実施例１の混和剤を５０倍に希釈した混練水を用いた供試体Ｃ及び比較のため標準配合（ＪＩＳ）された供試体Ｄの屋外暴露試験による中性化の進行状況試験を行った結果を示す。表３は供試体Ｃの配合表、表４は供試体Ｄの配合表である。 Here, the progress test of the neutralization by the outdoor exposure test of Specimen C using kneaded water obtained by diluting the admixture of Example 1 50 times and Specimen D standardly mixed (JIS) for comparison is performed. The results are shown. Table 3 is a recipe for specimen C, and Table 4 is a recipe for specimen D.
試験方法
（１）供試体
ＪＩＳ Ａ １１３２に規定された作成方法に拠って作製したφ１５×３０ｃｍ円柱供試体を用いた。
（２）養生方法
打設後２４時間して脱型した直後に搬入し、２８日間温度２０±２℃の恒温室中に設置された水槽中で水中養生した。
Test Method (1) Specimen A φ15 × 30 cm cylindrical specimen prepared according to the preparation method defined in JIS A1132.
(2) Curing method It carried in immediately after demolding 24 hours after placement, and was cured in water in a water tank installed in a temperature-controlled room at a temperature of 20 ± 2 ° C. for 28 days.
（３）試験時材齢
２８日養生後、屋外暴露試験を開始し、（材齢約９０日）、（材齢約１８０日）、（材齢約２７０日）、（材齢約３６０日）の材齢において中性化試験を実施した。
（４）中性化試験
供試体を屋外において中性化させる暴露試験を行った。屋外暴露試験は、出願人の住所地である熊本市にて実施した。
（５）コンクリートの中性化度の測定
コンクリートの中性化は、圧裂による供試体破断面にフェノールフタレイン溶液（１ｇを無水アルコール６５cm3に溶かして水を加え１００cm3とする）を噴霧器で塗布し、供試体断面撮影したものについて赤紫色に着色しない部分の面積を測定して平均中性化深さを求めた。
(3) Age at the time of testing After the 28-day curing, an outdoor exposure test was started, (material age of about 90 days), (material age of about 180 days), (material age of about 270 days), (material age of about 360 days) Neutralization tests were carried out at the ages.
(4) Neutralization test An exposure test was conducted to neutralize the specimen outdoors. The outdoor exposure test was conducted in Kumamoto City, the address of the applicant.
(5) Measurement of the degree of neutralization of concrete The neutralization of concrete is achieved by spraying a phenolphthalein solution (1 g in 65 cm 3 of absolute alcohol and adding water to 100 cm 3 ) on the fracture surface of the specimen due to crushing. The average neutralization depth was determined by measuring the area of the portion that was not colored reddish purple for the sample cross-sectioned and coated.
試験結果を表５に示す。 The test results are shown in Table 5.
表５から明らかなように、材齢３６０日での中性化深さが、材齢２７０日での測定値よりも少なくなっている。中性化試験では、供試体を圧裂、あるいは切断してその破断面が新鮮な状態で行わねばならない。そのため、中性化度の測定に一度供されたものは、再び仕様することができない。よって、個体差によるばらつきが出てくる場合があるため注意が必要である。しかしながら、材齢２７０日における中性化深さの計測値を無効とみなすことができるならば、時間の経過とともに表層より中性化部が深部へと進行していくことが見て取れる。 As is clear from Table 5, the neutralization depth at the age of 360 days is less than the measured value at the age of 270 days. In the neutralization test, the specimen must be crushed or cut and the fracture surface must be fresh. Therefore, once provided for the measurement of the degree of neutralization, it cannot be specified again. Therefore, caution is necessary because there may be variations due to individual differences. However, if the measured value of the neutralization depth at the age of 270 days can be regarded as invalid, it can be seen that the neutralized portion proceeds from the surface layer to the deeper portion with the passage of time.
これらを供試体の種類別にみると、用意した標準配合（ＪＩＳ）の供試体Ｄの方が中性化の進行が大きく、また供試体Ｃの方が、中性化の進行が遅い結果となっている。 Looking at these by type of specimen, the specimen D with the standard composition (JIS) prepared has a greater progress in neutralization, and the specimen C has a slower progress in neutralization. ing.
以上の説明から明らかなように、屋外における暴露試験に供されたコンクリート供試体の中性化度測定結果より、本発明にかかる混和剤を使用したコンクリート供試体は、本発明にかかる混和剤を使用しない標準配合のコンクリートと比べて中性化の進行が遅れる傾向が見られ、本発明にかかる混和剤が中性化の抑制効果を持つ可能性があることが判明した。 As is clear from the above explanation, the concrete specimen using the admixture according to the present invention shows that the admixture according to the present invention is determined from the measurement result of the neutralization degree of the concrete specimen subjected to the outdoor exposure test. There was a tendency for the progress of neutralization to be delayed as compared with the concrete of the standard composition not used, and it was found that the admixture according to the present invention may have an effect of suppressing neutralization.
なお、本明細書で使用している用語と表現は、あくまでも説明上のものであって、なんら限定的なものではなく、本明細書に記述された特徴およびその一部と等価の用語や表現を除外する意図はない。また、本発明の技術思想の範囲内で、種々の変形態様が可能であるということは言うまでもない。 Note that the terms and expressions used in this specification are merely explanatory and are not limiting at all, and terms and expressions equivalent to the features described in this specification and parts thereof. There is no intention to exclude. It goes without saying that various modifications are possible within the scope of the technical idea of the present invention.
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| CN103588417A (en) * | 2013-11-01 | 2014-02-19 | 江苏百瑞吉新材料有限公司 | Modifier of sodium lignosulfonate concrete water reducing agent |
| CN107673674A (en) * | 2017-10-24 | 2018-02-09 | 潍坊友容实业有限公司 | Loss prevention cement prefab for salt-soda soil supply and discharge drainage facility |
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| JPH02302352A (en) * | 1989-05-15 | 1990-12-14 | Mitsubishi Materials Corp | Rapid hardening type self-leveling composition for floor covering material |
| JP2000511151A (en) * | 1995-11-17 | 2000-08-29 | ダブリユ・アール・グレイス・アンド・カンパニー・コネテイカツト | Multipurpose mixtures for hydraulic cement compositions |
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| JPH02302352A (en) * | 1989-05-15 | 1990-12-14 | Mitsubishi Materials Corp | Rapid hardening type self-leveling composition for floor covering material |
| JP2000511151A (en) * | 1995-11-17 | 2000-08-29 | ダブリユ・アール・グレイス・アンド・カンパニー・コネテイカツト | Multipurpose mixtures for hydraulic cement compositions |
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| CN103588417A (en) * | 2013-11-01 | 2014-02-19 | 江苏百瑞吉新材料有限公司 | Modifier of sodium lignosulfonate concrete water reducing agent |
| CN107673674A (en) * | 2017-10-24 | 2018-02-09 | 潍坊友容实业有限公司 | Loss prevention cement prefab for salt-soda soil supply and discharge drainage facility |
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