JP6482861B2 - Inseparable mortar composition in water - Google Patents
Inseparable mortar composition in water Download PDFInfo
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- JP6482861B2 JP6482861B2 JP2014261893A JP2014261893A JP6482861B2 JP 6482861 B2 JP6482861 B2 JP 6482861B2 JP 2014261893 A JP2014261893 A JP 2014261893A JP 2014261893 A JP2014261893 A JP 2014261893A JP 6482861 B2 JP6482861 B2 JP 6482861B2
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 102
- 239000004570 mortar (masonry) Substances 0.000 title claims description 64
- 239000000203 mixture Substances 0.000 title claims description 26
- 239000000463 material Substances 0.000 claims description 65
- 239000004568 cement Substances 0.000 claims description 51
- 239000003638 chemical reducing agent Substances 0.000 claims description 50
- 239000011398 Portland cement Substances 0.000 claims description 29
- 239000000843 powder Substances 0.000 claims description 21
- 239000002562 thickening agent Substances 0.000 claims description 20
- 238000004898 kneading Methods 0.000 claims description 16
- 239000002253 acid Substances 0.000 claims description 12
- 239000004088 foaming agent Substances 0.000 claims description 8
- 229920000877 Melamine resin Polymers 0.000 claims description 7
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 4
- 239000011440 grout Substances 0.000 description 24
- 238000011161 development Methods 0.000 description 13
- 239000004567 concrete Substances 0.000 description 11
- 238000000034 method Methods 0.000 description 9
- 238000002156 mixing Methods 0.000 description 9
- 238000012360 testing method Methods 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 239000002518 antifoaming agent Substances 0.000 description 6
- 238000000926 separation method Methods 0.000 description 6
- WPJGWJITSIEFRP-UHFFFAOYSA-N 1,3,5-triazine-2,4,6-triamine;hydrate Chemical compound O.NC1=NC(N)=NC(N)=N1 WPJGWJITSIEFRP-UHFFFAOYSA-N 0.000 description 5
- 239000011444 non-shrink grout Substances 0.000 description 5
- 239000001913 cellulose Substances 0.000 description 4
- 229920002678 cellulose Polymers 0.000 description 4
- 239000004571 lime Substances 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 3
- 235000011941 Tilia x europaea Nutrition 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000012615 aggregate Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
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- 229910001653 ettringite Inorganic materials 0.000 description 2
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- 238000009472 formulation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- LNAZSHAWQACDHT-XIYTZBAFSA-N (2r,3r,4s,5r,6s)-4,5-dimethoxy-2-(methoxymethyl)-3-[(2s,3r,4s,5r,6r)-3,4,5-trimethoxy-6-(methoxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6r)-4,5,6-trimethoxy-2-(methoxymethyl)oxan-3-yl]oxyoxane Chemical compound CO[C@@H]1[C@@H](OC)[C@H](OC)[C@@H](COC)O[C@H]1O[C@H]1[C@H](OC)[C@@H](OC)[C@H](O[C@H]2[C@@H]([C@@H](OC)[C@H](OC)O[C@@H]2COC)OC)O[C@@H]1COC LNAZSHAWQACDHT-XIYTZBAFSA-N 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 229920002907 Guar gum Polymers 0.000 description 1
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 description 1
- 239000004354 Hydroxyethyl cellulose Substances 0.000 description 1
- 229920002153 Hydroxypropyl cellulose Polymers 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000011400 blast furnace cement Substances 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 229920003086 cellulose ether Polymers 0.000 description 1
- 229920003174 cellulose-based polymer Polymers 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000665 guar gum Substances 0.000 description 1
- 235000010417 guar gum Nutrition 0.000 description 1
- 229960002154 guar gum Drugs 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 description 1
- 239000001863 hydroxypropyl cellulose Substances 0.000 description 1
- 235000010977 hydroxypropyl cellulose Nutrition 0.000 description 1
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 description 1
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 description 1
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 description 1
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 235000010981 methylcellulose Nutrition 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000004227 thermal cracking Methods 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
本発明は、水中打設に用いられるグラウト材（水中グラウト）に主に使用される水中不分離性モルタル組成物及び水中不分離性モルタルに関する。 The present invention relates to an underwater inseparable mortar composition and underwater inseparable mortar that are mainly used for grout materials (underwater grout) used for underwater placement.
河川や海岸の土木工事等で、モルタル（コンクリートを含む）を水中で打設する際、周囲の水との接触を出来るだけ断ち、材料分離を最小限に止めることが重要である。従来は、通常配合のコンクリートをコンクリートポンプ工法やトレミー工法で打設することが行われてきた。しかしながら、何れの工法も材料分離が大きく、打設現場の水質汚染が課題となっていた。 When placing mortar (including concrete) underwater in civil engineering works on rivers and coasts, it is important to minimize contact with surrounding water and minimize material separation. Conventionally, it has been practiced to cast a concrete blended concrete by a concrete pump method or a tremy method. However, each method has a large material separation, and water pollution at the site of placement has been a problem.
そのため、混和することによりモルタル自身の性能を改良し、モルタルの水中における材料分離抵抗性を向上する、セルロース系やアクリル系の高分子を主成分とした水中不分離性混和剤（増粘剤）又は当該水中不分離性混和剤を含有する水中グラウト用混和材を混和したモルタル（グラウト材）を水中で打設する技術が提案されている（例えば、特許文献１参照。）。
また、水中施工において締固めを行うと材料分離、強度低下又は周りの水の濁りが増すため、締固めを極力行わずとも充填できる良好な流動性が必要となる。特定のポリカルボン酸系減水剤と特定のメラミン系減水剤を併用することによって高い流動性を有する水中不分離性モルタル組成物が提案されている（例えば、特許文献２参照。）。
Therefore, by mixing, the performance of the mortar itself is improved, and the material separation resistance of the mortar in water is improved. The non-separable admixture (thickener) based on cellulose and acrylic polymers. Alternatively, a technique has been proposed in which a mortar (grouting material) mixed with an underwater grout admixture containing the underwater inseparable admixture is placed in water (see, for example, Patent Document 1).
In addition, when compaction is performed in underwater construction, material separation, strength reduction, or turbidity of surrounding water increases, so that good fluidity that can be filled without performing compaction as much as possible is required. An underwater inseparable mortar composition having high fluidity by using a specific polycarboxylic acid water reducing agent and a specific melamine water reducing agent in combination has been proposed (for example, see Patent Document 2).
従来から、橋脚の耐震工法として鋼板巻き立て工法が行われており、間隙の充填材には無収縮グラウト材（無収縮モルタル）が用いられ、近年、その耐震補強工事が進捗し、水中の橋脚への施工が増えてきている。そのため、鋼板と橋脚との間隙部に河川の水が満たされた場所において、良好な水中不分離性を有する無収縮グラウト材が用いられることが増えてきた。加えて通常の無収縮グラウト材並みの強度発現性（２０℃、材齢２８日において５０Ｎ／ｍｍ２以上）を水中打設の場合においても求められることも増えてきた。しかしながら、水中不分離性グラウト材では、通常の無収縮グラウト材並みの強度発現性を求めると、単位セメント量の増量や早期強度発現性を有するセメントの使用などの配合設計の変更が考えられるが、水中不分離性の観点からは好ましくない。
かかる点から、水中打設の場合においても通常の無収縮グラウト材並みの強度発現性を有し、且つ高い流動性も有する水中不分離性グラウト材が得られる水中不分離性モルタル組成物及び水中不分離性モルタルが求められている。
Conventionally, a steel plate winding method has been used as a seismic method for bridge piers, and non-shrink grout material (non-shrink mortar) has been used as the gap filling material. Construction is increasing. For this reason, non-shrink grout materials having good underwater inseparability have been increasingly used in places where river water is filled in the gap between the steel plate and the pier. In addition, there is an increasing demand for strength development (at 20 ° C., 50 N / mm 2 or more at 28 days of age) equivalent to that of a normal non-shrink grout material even in the case of underwater placement. However, in the case of a non-separable grout material in water, when the strength developability equivalent to that of a normal non-shrink grout material is obtained, it is possible to change the blending design such as increasing the amount of unit cement or using cement with early strength development. From the viewpoint of inseparability in water, it is not preferable.
From this point, even in the case of underwater casting, the underwater non-separable mortar composition and the underwater can provide an underwater non-separable grout material that has the same strength development as ordinary non-shrink grout materials and also has high fluidity. There is a need for non-separable mortars.
そこで、本発明者は、前記課題を解決すべく、セメントの種類、細骨材、増粘剤及び水粉体比等について種々検討した結果、普通ポルトランドセメントと早強ポルトランドセメントを特定割合で配合し、かつ細骨材、増粘剤及び水粉体比を一定の割合とすることによって、水中打設でも優れた強度発現性を有し、かつ高い流動性も有する水中不分離性モルタル組成物が得られることを見出し、本発明を完成した。 Therefore, in order to solve the above problems, the present inventor conducted various studies on the type of cement, fine aggregate, thickener, water powder ratio, etc. In addition, by adjusting the ratio of fine aggregate, thickener and water powder to a certain ratio, the composition has an excellent strength development even when placed in water and has a high fluidity. Was found and the present invention was completed.
すなわち、本発明は、次の〔１〕〜〔６〕を提供するものである。
〔１〕膨張材、減水剤、増粘剤、セメント及び細骨材を含有し、前記セメントが普通ポルトランドセメント及び早強ポルトランドセメントを主要セメント成分とし且つ含有する早強ポルトランドセメントに対する普通ポルトランドセメントの質量比が２５／７５〜７５／２５であるセメントであり、セメント１００質量部に対して細骨材２５〜８０質量部及び増粘剤０．３〜０．６質量部を含有し、水粉体比２３．５〜２７．５％で混練することを特徴とする水中不分離性モルタル組成物。
〔２〕セメント１００質量部に対して、膨張材０．５〜３．５質量部及び減水剤１〜４質量部を含有するものである上記〔１〕の水中不分離性モルタル組成物。
〔３〕前記減水剤が、セメント１００質量部に対してポリカルボン酸系減水剤０．３〜２質量部及びメラミン系減水剤０．３〜３質量部を併用するものである上記〔１〕又は〔２〕の水中不分離性モルタル組成物。
〔４〕さらに、消泡剤及び発泡剤から選ばれる１種以上を含有する上記〔１〕〜〔３〕のいずれかの水中不分離性モルタル組成物。
〔５〕上記〔１〕〜〔４〕のいずれかに記載の水中不分離性モルタル組成物と、水粉体比２３．５〜２７．５％の水とを混練してなる水中不分離性モルタル。
〔６〕膨張材、減水剤、増粘剤を含有する混和材料と水とを混練してなる懸濁物質と、セメント及び細骨材とを混練してなる上記〔５〕の水中不分離性モルタル。
That is, the present invention provides the following [1] to [6].
[1] A composition of ordinary Portland cement relative to early-strength Portland cement, which contains an expanding material, a water reducing agent, a thickener, cement and fine aggregate, and the cement contains ordinary Portland cement and early-strength Portland cement as main cement components. It is a cement having a mass ratio of 25/75 to 75/25, and contains 25 to 80 parts by mass of fine aggregate and 0.3 to 0.6 parts by mass of a thickener with respect to 100 parts by mass of cement. A non-separable mortar composition in water characterized by kneading at a body ratio of 23.5 to 27.5%.
[2] The underwater non-separable mortar composition according to the above [1], which contains 0.5 to 3.5 parts by mass of an expansion material and 1 to 4 parts by mass of a water reducing agent with respect to 100 parts by mass of cement.
[3] The above [1], wherein the water reducing agent is a combination of 0.3 to 2 parts by mass of a polycarboxylic acid-based water reducing agent and 0.3 to 3 parts by mass of a melamine water reducing agent with respect to 100 parts by mass of cement. Or the underwater non-separable mortar composition of [2].
[4] The underwater non-separable mortar composition according to any one of the above [1] to [3], further comprising at least one selected from an antifoaming agent and a foaming agent.
[5] Underwater inseparability formed by kneading the underwater inseparable mortar composition according to any one of [1] to [4] above and water having a water powder ratio of 23.5 to 27.5%. mortar.
[6] The underwater inseparability according to [5] above, wherein a suspended substance obtained by kneading an admixture containing an expanding material, a water reducing agent and a thickener and water, and a cement and fine aggregate are kneaded. mortar.
本発明によれば、水中打設の場合においても通常の無収縮グラウト材並みの優れた強度発現性を有し且つグラウト材として用いることができる高い流動性も有する水中不分離性モルタルが得られる水中不分離性モルタル組成物が得られる。
また、本発明によれば、水中打設の場合においても通常の無収縮グラウト材並みの優れた強度発現性を有し且つ高い流動性も有する水中不分離性グラウト材が得られる水中不分離性モルタルが得られる。
また、本発明によれば、水中打設の場合においても通常の無収縮グラウト材並みの優れた強度発現性を有し且つ高い流動性も有する水中不分離性グラウト材が得られる。
また、本発明によれば、無収縮性の水中不分離性モルタル組成物、水中不分離性モルタル又は水中不分離性グラウト材が得られる。
According to the present invention, an underwater non-separable mortar is obtained that has excellent strength development like that of a normal non-shrinkable grout material even in the case of underwater placement and also has high fluidity that can be used as a grout material. An inseparable mortar composition in water is obtained.
Further, according to the present invention, even in the case of underwater placement, the underwater inseparability can be obtained in which an underwater inseparable grout material having excellent strength development as in a normal non-shrinkable grout material and having high fluidity is obtained. Mortar is obtained.
In addition, according to the present invention, an underwater non-separable grout material having excellent strength development as in a normal non-shrinkable grout material and high fluidity can be obtained even in the case of underwater casting.
Moreover, according to this invention, a non-shrinkable underwater inseparable mortar composition, underwater inseparable mortar, or underwater inseparable grout material is obtained.
以下、本発明を詳細に説明する。
本発明の水中不分離性モルタル組成物は、膨張材、減水剤、増粘剤、セメント及び細骨材を含有し、前記セメントが普通ポルトランドセメント及び早強ポルトランドセメントを主要セメント成分とし且つ含有する早強ポルトランドセメントに対する普通ポルトランドセメントの質量比が２５／７５〜７５／２５であるセメントであり、セメント１００質量部に対して細骨材２５〜８０質量部及び増粘剤０．３５〜０．５５質量部を含有し、水粉体比２３．５〜２７．５％で混練することを特徴とする。
Hereinafter, the present invention will be described in detail.
The underwater inseparable mortar composition of the present invention contains an expansion agent, a water reducing agent, a thickener, a cement and a fine aggregate, and the cement contains ordinary Portland cement and early-strength Portland cement as main cement components and contains. The mass ratio of ordinary Portland cement to early-strength Portland cement is 25/75 to 75/25, and 25 to 80 parts by mass of fine aggregate and thickener 0.35 to 0. It contains 55 parts by mass and is kneaded at a water powder ratio of 23.5 to 27.5%.
発明で使用するセメントとしては、普通、早強、超早強、低熱、及び中庸熱等の各種ポルトランドセメント、これらポルトランドセメントに、高炉スラグ粉末、フライアッシュ、又はシリカ粉末を混合した各種混合セメント、各種の産業廃棄物を主原料として製造されるエコセメントなどが挙げられ、これらのうちの一種又は二種以上が使用可能である。
本発明では、強度発現性や材料分離抵抗性の観点から、普通ポルトランドセメント及び早強ポルトランドセメントを主要セメント成分として併用することが好ましい。このとき、普通ポルトランドセメントと早強ポルトランドセメントの質量比は、早強ポルトランドセメントに対する普通ポルトランドセメントの質量比が２５／７５〜７５／２５、即ち、普通ポルトランドセメントの質量：早強ポルトランドセメントの質量比が２５：７５〜７５：２５である。当該質量比が２５／７５未満の場合、良好な水中不分離性が得られない虞がある。また、当該質量比が７５／２５を超える場合、水中打設における強度が低い虞がある。より好ましくは、当該質量比を３０／７０〜７０／３０とし、さらに好ましくは３５／６５〜６５／３５とする。
As the cement used in the invention, various portland cements such as normal, early strength, super early strength, low heat, and moderate heat, various mixed cements obtained by mixing these portland cements with blast furnace slag powder, fly ash, or silica powder, Examples include eco-cement produced using various industrial wastes as main raw materials, and one or more of these can be used.
In the present invention, it is preferable to use ordinary Portland cement and early strong Portland cement as the main cement component from the viewpoint of strength development and material separation resistance. At this time, the mass ratio of ordinary Portland cement to early strength Portland cement is 25/75 to 75/25 of ordinary Portland cement to early strength Portland cement, that is, the mass of ordinary Portland cement: mass of early strength Portland cement. The ratio is 25:75 to 75:25. When the said mass ratio is less than 25/75, there exists a possibility that favorable non-separability in water may not be obtained. Moreover, when the said mass ratio exceeds 75/25, there exists a possibility that the intensity | strength in underwater placement may be low. More preferably, the mass ratio is 30/70 to 70/30, and more preferably 35/65 to 65/35.
本発明では水中不分離性を付与するため増粘剤を使用する。
本発明で使用する増粘剤は、水溶性のセルロース系、アクリル系、グアーガム系などの増粘剤が使用でき、これらの一種又は二種以上の使用が可能である。少量の使用でも水中不分離性が高いことから、本発明で使用する増粘剤としては水溶性セルロースが好ましい。水溶性セルロースとしては、セルロース系高分子化合物、例えば、カルボキシメチルセルロース、メチルセルロース、ヒドロキシプロピルメチルセルロース、ヒドロキシエチルセルロース、ヒドロキシプロピルセルロース等の水溶性セルロースエーテルが好ましい。
上記増粘剤の含有量は、セメント１００質量部に対して０．３〜０．６質量部とする。０．３質量部未満では、適正な水中不分離性が得られ難く、水中打設における強度が低い虞がある。０．６質量部を超えるとモルタルの粘性が高くなり過ぎ、充分な流動性が得られず、ポンプ圧送の際ホースが閉塞したり、充填性が損なわれる虞がある。好ましくは、セメント１００質量部に対して０．３５〜０．５５質量部とし、より好ましくは０．４〜０．５質量部とする。
In the present invention, a thickener is used in order to impart inseparability in water.
As the thickener used in the present invention, water-soluble cellulose-based, acrylic-based and guar gum-based thickeners can be used, and one or more of these can be used. Water-soluble cellulose is preferred as the thickener used in the present invention because it is highly separable in water even in small amounts. As the water-soluble cellulose, a cellulose-based polymer compound, for example, a water-soluble cellulose ether such as carboxymethyl cellulose, methyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose or the like is preferable.
Content of the said thickener shall be 0.3-0.6 mass part with respect to 100 mass parts of cement. If the amount is less than 0.3 parts by mass, it is difficult to obtain appropriate inseparability in water, and there is a possibility that the strength in underwater placement is low. If it exceeds 0.6 parts by mass, the viscosity of the mortar becomes too high, and sufficient fluidity cannot be obtained, and the hose may be blocked during pumping or the filling property may be impaired. Preferably, it is 0.35-0.55 mass part with respect to 100 mass parts of cement, More preferably, it is 0.4-0.5 mass part.
本発明で使用する細骨材としては、例えば、川砂、海砂、山砂、砕砂、人工細骨材、スラグ細骨材、再生細骨材等が挙げられ、これらの一種又は二種以上の使用が可能であるが、モルタルが高い流動性を得られることから、公称呼び寸法５ｍｍの篩に留まる粒子が５質量％未満であることが好ましく、公称呼び寸法５ｍｍの篩に留まる粒子が１質量％未満であることがより好ましく、公称呼び寸法２．５ｍｍの篩に留まる粒子が１質量％未満であることが更に好ましい。 Examples of the fine aggregate used in the present invention include river sand, sea sand, mountain sand, crushed sand, artificial fine aggregate, slag fine aggregate, recycled fine aggregate, etc., and one or more of these Although it can be used, since the mortar can obtain high fluidity, it is preferable that the number of particles remaining on the sieve having a nominal size of 5 mm is less than 5% by mass, and the amount of particles remaining on the sieve having a nominal size of 5 mm is 1 mass. It is more preferable that the number of particles remaining on the sieve having a nominal nominal size of 2.5 mm is less than 1% by mass.
細骨材の含有量は、セメント１００質量部に対して２５〜８０質量部とする。２５質量部未満では、良好な水中不分離性が得られなかったり、大量打設した際に熱ひび割れが発生する虞があり、８０質量部を超えると充分な圧縮強度が得られなくなる虞がある。より好ましくは、セメント１００質量部に対して２５〜７５質量部であり、さらに好ましくは３０〜５０質量部である。 The fine aggregate content is 25 to 80 parts by mass with respect to 100 parts by mass of cement. If the amount is less than 25 parts by mass, good inseparability in water may not be obtained, or thermal cracking may occur when a large amount of the material is placed, and if it exceeds 80 parts by mass, sufficient compression strength may not be obtained. . More preferably, it is 25-75 mass parts with respect to 100 mass parts of cement, More preferably, it is 30-50 mass parts.
本発明では、打設したモルタルの乾燥収縮等の収縮を補償し、ひび割れの発生を抑制する目的で膨張材を使用する。本発明に係わるグラウト材（モルタル）は、主に、水中に打設するものであるが、気中で打設することもあり、その際の乾燥収縮を補償しひび割れの発生を抑制する効果は、膨張材を含有すると大きいものである。
本発明で使用する膨張材としては、水和反応により、エトリンガイトや水酸化カルシウムを生成するものであればよく、カルシウムサルフォアルミネート系（エトリンガイト系）膨張材、カルシウムアルミノフェライト系膨張材、（生）石灰系膨張材、エトリンガイト−石灰複合系膨張材及び石膏系膨張材等が挙げられ、これらの一種又は二種以上が使用可能であり、（生）石灰系膨張材がより好ましい。含有する膨張材として（生）石灰系膨張材を用いると、海水中に打設する場合においても、膨張率が比較的安定する。
In the present invention, the expansion material is used for the purpose of compensating for shrinkage such as drying shrinkage of the mortar placed and suppressing the occurrence of cracks. The grout material (mortar) according to the present invention is mainly placed in water, but may be placed in the air, and the effect of suppressing the occurrence of cracks by compensating for drying shrinkage at that time is When the expansion material is contained, it is large.
The expansion material used in the present invention may be any material that generates ettringite and calcium hydroxide by a hydration reaction, and includes calcium sulfoaluminate (ettringite) expansion material, calcium aluminoferrite expansion material, A raw) lime-based expansion material, an ettringite-lime composite expansion material, a gypsum-based expansion material, and the like can be used, and one or more of these can be used, and a (raw) lime-based expansion material is more preferable. When a (fresh) lime-based expansion material is used as the expansion material to be contained, the expansion rate is relatively stable even when it is placed in seawater.
用いる膨張材の粉末度は、低温時の膨張発現性確保及び適正な膨張率と流動性の点から、ブレーン比表面積（以下、ブレーン値という）で２０００〜６０００ｃｍ２／ｇが好ましく、２５００〜５０００ｃｍ２／ｇがより好ましい。 The fineness of the expansion material used is preferably from 2,000 to 6000 cm 2 / g in terms of the specific surface area of the brane (hereinafter referred to as the brane value), from the viewpoint of ensuring expansion at low temperatures and appropriate expansion rate and fluidity. 2 / g is more preferable.
膨張材の含有量は、適正な膨張性状を得、硬化体の破壊防止の点から、セメント１００質量部に対して０．５〜３．５質量部とすることが好ましい。より好ましくは、セメント１００質量部に対して０．７〜３．２質量部とし、さらに好ましくは０．８〜３．０質量部とする。 The content of the expansion material is preferably 0.5 to 3.5 parts by mass with respect to 100 parts by mass of cement from the viewpoint of obtaining an appropriate expansion property and preventing the cured body from being broken. More preferably, it is 0.7-3.2 mass parts with respect to 100 mass parts of cement, More preferably, it is 0.8-3.0 mass parts.
本発明では、水中不分離性を確保しながらグラウト材としての流動性を付与するために減水剤を含有する。本発明でいう減水剤とは、高性能減水剤、高性能ＡＥ減水剤、流動化剤及びセメント分散剤を含むものである。流動性を高く且つ材料分離が起こり難くし易いことから、本発明で使用する減水剤としては、高性能減水剤又は高性能ＡＥ減水剤が好ましい。
減水剤の含有量は、水中不分離性を確保しながらグラウト材として適正な流動性が得られる点、水との練り混ぜる際に、モルタル上面の泡の発生を防止し、凝結時間の遅延防止、強度低下防止の点から、セメント１００質量部に対して１〜４質量部が好ましい。より好ましくは、セメント１００質量部に対して１．２〜３．８質量部とし、さらに好ましくは１．５〜３．５質量部とする。
In this invention, in order to provide the fluidity | liquidity as a grout material, ensuring a non-separability in water, a water reducing agent is contained. The water reducing agent referred to in the present invention includes a high performance water reducing agent, a high performance AE water reducing agent, a fluidizing agent, and a cement dispersant. As a water reducing agent used in the present invention, a high performance water reducing agent or a high performance AE water reducing agent is preferable because it has high fluidity and is unlikely to cause material separation.
The content of the water reducing agent ensures proper fluidity as a grout material while ensuring inseparability in water, prevents foaming on the top of the mortar when mixing with water, and prevents delay in setting time From the point of prevention of strength reduction, 1 to 4 parts by mass is preferable with respect to 100 parts by mass of cement. More preferably, it is 1.2-3.8 mass parts with respect to 100 mass parts of cement, More preferably, it is 1.5-3.5 mass parts.
本発明で使用する減水剤はポリカルボン酸系減水剤及び／又はメラミン系減水剤が好ましい。本発明で使用する減水剤の形態は、液状、粉末状の何れも使用可能であるが、粉末状の混和材（剤）又はプレミックスモルタルとすることができることから、粉末状のものを使用することが好ましい。
また、本発明で使用する減水剤としては、ポリカルボン酸系減水剤とメラミン系減水剤を併用することが初期の流動性が高く又その後の流動性保持性能にも優れることから好ましい。水中不分離性の確保、適正な流動性の確保、凝結の遅延や強度低下防止の点から、ポリカルボン酸系減水剤の含有量は、セメント１００質量部に対して０．３〜２質量部とすることが好ましく、メラミン系減水剤は０．３〜３質量部とすることが好ましい。また、セメント１００質量部に対して、ポリカルボン酸系減水剤は０．４〜１．８質量部、メラミン系減水剤は０．４〜２．８質量部とすることがより好ましい。
The water reducing agent used in the present invention is preferably a polycarboxylic acid water reducing agent and / or a melamine water reducing agent. The form of the water reducing agent used in the present invention can be either liquid or powdery, but since it can be a powdery admixture (agent) or premix mortar, a powdery one is used. It is preferable.
Moreover, as a water reducing agent used by this invention, it is preferable to use a polycarboxylic acid type water reducing agent and a melamine type water reducing agent together from the viewpoint of high initial fluidity and excellent fluidity retention performance thereafter. The content of the polycarboxylic acid-based water reducing agent is 0.3 to 2 parts by mass with respect to 100 parts by mass of cement from the viewpoint of ensuring inseparability in water, ensuring proper fluidity, delaying the setting, and preventing strength reduction. The melamine water reducing agent is preferably 0.3 to 3 parts by mass. Moreover, it is more preferable that the polycarboxylic acid water reducing agent is 0.4 to 1.8 parts by mass and the melamine water reducing agent is 0.4 to 2.8 parts by mass with respect to 100 parts by mass of the cement.
本発明では、連行した空気を消泡させ、空気連行が原因の強度低下を防止する目的で消泡剤を使用するのが好ましい。その形態は減水剤と同様に、液状及び粉末状の何れもあるが、粉末状の混和材（剤）又はプレミックスモルタルとすることができることから、粉末状のものを使用することが好ましい。
消泡剤の含有量は、セメント１００質量部に対して０．０５〜０．３質量部とすることが好ましい。
In the present invention, it is preferable to use an antifoaming agent for the purpose of defoaming the entrained air and preventing a decrease in strength caused by the air entrainment. Like the water reducing agent, the form may be either liquid or powder, but since it can be a powder admixture (agent) or premix mortar, it is preferable to use a powder.
The content of the antifoaming agent is preferably 0.05 to 0.3 parts by mass with respect to 100 parts by mass of cement.
本発明の水中不分離性モルタル組成物をグラウト材として利用する場合、グラウト材と構造物と一体化させるため、未硬化の状態のグラウト材が沈下又は収縮することを抑止するために、本発明では発泡剤を使用するのが好ましい。使用する発泡剤としては、アルミニウム粉末や過酸化物質等が挙げられ、アルミニウム粉末の使用が好ましい。
発泡剤の含有量は、セメント１００質量部に対して０．００５〜０．０１５質量部が好ましい。
When using the underwater inseparable mortar composition of the present invention as a grout material, in order to integrate the grout material and the structure, in order to prevent the uncured grout material from sinking or shrinking, the present invention Then, it is preferable to use a foaming agent. Examples of the foaming agent to be used include aluminum powder and peroxide substances, and the use of aluminum powder is preferable.
As for content of a foaming agent, 0.005-0.015 mass part is preferable with respect to 100 mass parts of cement.
本発明の水中不分離性モルタル組成物は水と混練して用いる。
水の使用量は、水粉体比２３．５〜２７．５％とする。ここで、水粉体比とは、水中不分離性モルタル組成物中の粉体（固体）の質量（Ｐ）に対する混練に用いる水の質量（Ｗ）の比率（Ｗ／Ｐ）である。水粉体比が２３．５％未満ではグラウト材としての流動性を得ることが難しく、２７．５％を超えると強度発現性を確保することが困難になる虞がある。水粉体比は２４．０〜２７．０％が好ましく、２４．５〜２６．５％がより好ましい。
The underwater inseparable mortar composition of the present invention is used by kneading with water.
The amount of water used is 23.5 to 27.5% of the water powder ratio. Here, the water powder ratio is the ratio (W / P) of the mass (W) of water used for kneading to the mass (P) of the powder (solid) in the underwater inseparable mortar composition. If the water powder ratio is less than 23.5%, it is difficult to obtain fluidity as a grout material, and if it exceeds 27.5%, it may be difficult to ensure strength development. The water powder ratio is preferably 24.0 to 27.0%, more preferably 24.5 to 26.5%.
水と混練する方法は特に限定されず、例えば水に本発明の水中不分離性モルタル組成物を全量加えて混練する方法、水と膨張材、減水剤及び増粘剤、必要により消泡剤及び／又は発泡剤を含有する混和材料を混練することで懸濁物質（混和材料スラリー）を作製し、その後セメント及び細骨材を加えて混練する方法等がある。
混練に用いる器具や混練装置も特に限定されないが、ミキサを用いることで量を多く混練することが出来るため好ましい。用いることの出来るミキサとしては連続式ミキサでもバッチ式ミキサでも良く、例えば、パン型コンクリートミキサ、パグミル型コンクリートミキサ、重力式コンクリートミキサ、グラウトミキサ、ハンドミキサ、左官ミキサ等が挙げられる。
The method of kneading with water is not particularly limited, for example, a method of adding and kneading all the water-inseparable mortar composition of the present invention to water, water and an expanding material, a water reducing agent and a thickener, and if necessary, an antifoaming agent and There is a method of preparing a suspended substance (admixture slurry) by kneading an admixture containing a foaming agent and / or kneading after adding cement and fine aggregate.
An apparatus and a kneading apparatus used for kneading are not particularly limited, but a mixer is preferable because a large amount can be kneaded. The mixer that can be used may be a continuous mixer or a batch mixer, and examples thereof include a pan-type concrete mixer, a pug mill-type concrete mixer, a gravity concrete mixer, a grout mixer, a hand mixer, and a plaster mixer.
以下、本発明の実施例に基づいて本発明をさらに説明するが、本発明はこれらに限定されるものではない。 EXAMPLES Hereinafter, although this invention is further demonstrated based on the Example of this invention, this invention is not limited to these.
［実施例１］
使用材料を表１に示した。
[Example 1]
The materials used are shown in Table 1.
［配合設計］
セメントとしてＮＣ及びＨＣを使用し、足し合わせたセメントの質量１００質量部に対して、膨張材２質量部、ポリカルボン酸系高性能減水剤０．８質量部、メラミン系高性能減水剤１．２質量部、消泡剤０．１質量部、発泡剤０．００７質量部とし、それ以外の使用材料を表２に示す配合割合となるように配合設計した。但し、セメントとして配合Ｎｏ．１−１８はＬＣを、Ｎｏ．１−１９はＢＢを、ＮＣ及びＨＣとともに併用した。また、試料中の水粉体比は全ての粉体の合計量に対する水の割合を示す。
[Formulation design]
NC and HC are used as the cement, and 2 parts by mass of the expansion material, 0.8 parts by mass of the polycarboxylic acid-based high-performance water reducing agent, and melamine-based high-performance water reducing agent are added to 100 parts by mass of the combined cement. 2 parts by mass, 0.1 part by mass of antifoaming agent, and 0.007 part by mass of foaming agent were used, and other materials used were blended and designed so as to have the blending ratio shown in Table 2. However, blending No. as cement. 1-18 is LC, No. 1-19 used BB together with NC and HC. The water powder ratio in the sample indicates the ratio of water to the total amount of all powders.
［モルタル作製］
モルタル組成物（水以外のもの）の全質量が４．０００ｋｇとなるように、セメント及び細骨材以外の各材料を所定の配合割合で容量８Ｌのステンレス製円筒容器に秤とり、ハンドミキサで１０秒間混練した後に、所定量のセメント及び細骨材を更に投入し、１２０秒間撹拌し、モルタルを作製した。
作製したモルタルを以下に示す評価試験方法により評価した。各試験の試験結果を表３に示した。
[Mortar preparation]
Each material other than cement and fine aggregate is weighed into a stainless steel cylindrical container with a capacity of 8 L at a predetermined blending ratio so that the total mass of the mortar composition (other than water) is 4.000 kg. After kneading for 10 seconds, a predetermined amount of cement and fine aggregate were further added and stirred for 120 seconds to prepare a mortar.
The produced mortar was evaluated by the following evaluation test method. The test results of each test are shown in Table 3.
［流動性試験］
ＪＩＳ Ｒ ５２０１「セメントの物理試験方法」１１．「フロー試験」（ただし、１５回の落下運動は行わず測定を行った。）に準じて、フロー値（引き抜きフロー）を測定した。流動性の指標は、練り上り直後のフロー値が２２０ｍｍ以上とした。また、フロー値は、２０℃環境下で実施し、フローコーンを引き抜き後５分経過時のフロー値を測定した。
[Fluidity test]
10. JIS R 5201 “Physical test method for cement” The flow value (drawing flow) was measured according to the “flow test” (however, the measurement was carried out without performing 15 drop movements). The flowability index was such that the flow value immediately after kneading was 220 mm or more. Moreover, the flow value was implemented in a 20 degreeC environment, and the flow value at the time of 5-minute progress was measured after pulling out the flow cone.
［水中不分離性］
土木学会基準ＪＳＣＥ−Ｄ １０４−２０１３「コンクリート用水中不分離性混和剤品質規格（案）」附属書２（規定）「水中不分離性コンクリートの水中不分離度試験方法（案）」に準じて、懸濁物質量を測定した。水中不分離度の指標は、土木学会規準ＪＳＣＥ−Ｄ １０４−２０１３「コンクリート用水中不分離性混和剤品質規格（案）」に示されている懸濁物質量５０ｍｇ／Ｌ以下とした。
[Unseparable in water]
In accordance with JSCE-D 104-2013 “Quality Standard for Underwater Inseparable Admixture for Concrete (Draft)” Annex 2 (normative) “Test Method for Underwater Inseparability of Underwater Inseparable Concrete (Draft)” The amount of suspended matter was measured. The index of the degree of inseparability in water was set to 50 mg / L or less of the suspended solids indicated in the Japan Society of Civil Engineers standard JSCE-D 104-2013 “Quality standard for underwater inseparable admixture for concrete (draft)”.
［初期膨張率試験］
土木学会基準ＪＳＣＥ−Ｆ ５４２−２０１３「充填モルタルのブリーディング率および膨張収縮率試験方法」に従って、材齢１日の初期膨張率を測定した。
[Initial expansion test]
The initial expansion rate at the age of 1 day was measured according to JSCE-F 542-2013 “Testing method for bleeding rate and expansion / contraction rate of filled mortar”.
［圧縮強度試験］
ＪＳＣＥ−Ｇ ５４１−１９９９「充填モルタルの圧縮強度試験方法」に準じ、材齢２８日における圧縮強度を測定した。このときの水中作製供試体の作り方は、ＪＳＣＥ−Ｆ ５０４−２０１３に準じた。なお、供試体の寸法は、直径５０ｍｍ、高さ１００ｍｍとした。圧縮強度発現性の指標は、ＪＳＣＥ−Ｄ １０４−２０１３「コンクリート用水中不分離性混和剤品質規格（案）」に示されている水中気中強度比８０％以上とした。また、通常の無収縮モルタルの同等程度となる圧縮強度についての強度発現性の指標としては、材齢２８日において５０Ｎ／ｍｍ２以上とした。
[Compressive strength test]
The compressive strength at the age of 28 days was measured according to JSCE-G 541-1999 “Testing method for compressive strength of filled mortar”. The method of making the underwater preparation specimen at this time conformed to JSCE-F 504-2013. The dimensions of the specimen were 50 mm in diameter and 100 mm in height. The index of compressive strength expression was set to 80% or more of the strength ratio in water and air shown in JSCE-D 104-2013 “Quality Standard for Underwater Separable Admixture for Concrete (Draft)”. Moreover, as an index of the strength development property about the compressive strength which is equivalent to that of a normal non-shrink mortar, it was set to 50 N / mm 2 or more at a material age of 28 days.
普通ポルトランドセメント及び早強ポルトランドセメントを主要セメント成分とし、早強ポルトランドセメントに対する普通ポルトランドセメントの質量比（ＮＣ／ＨＣ）が２５／７５〜７５／２５としてなるセメント合計１００質量部に対して細骨材が２５〜８０質量部、増粘剤０．３〜０．６質量部、水粉体比２３．５〜２７．５％、特に、上記セメント合計１００質量部に対して細骨材が２５〜７５質量部、増粘剤０．３５〜０．５５質量部、水粉体比２４．０〜２７．０％であれば、良好な水中不分離性、流動性及び強度発現性が得られ、水中打設に用いられるグラウト材としても好適に用いられる性状であった（Ｎｏ．１−１〜１−３，１−６，１−７，１−１０，１−１１，１−１４，１−１５）。勿論、当該実施例に当たるモルタルは、気中打設に用いるグラウト材としても好適に用いることができる。また、セメント成分に低熱ポルトランドセメント、高炉セメント等の早強ポルトランドセメント及び普通ポルトランドセメント以外のセメントが一部置換されても、良好な水中不分離性、流動性及び強度発現性が得られた（Ｎｏ．１−１８，１−１９）。それに対して、比較例に当たるモルタルのうち配合Ｎｏ．１−５、１−８、１−１２及び１−１７のモルタルでは、水中不分離性が不良であり懸濁物質量が５０ｍｇ／Ｌを以上であり、気中水中強度比が８０％に達していない。また、配合Ｎｏ．１−１３及び１−１６のモルタルでは流動性が不良であり、フロー値が２２０ｍｍに満たない。また、Ｎｏ．１−４及び１−９のモルタルでは、水中打設における強度発現が不良であり、圧縮強度が５０Ｎ／ｍｍ２に達していない。
また、実施例に当たるモルタルは、全て初期膨張を示しているので、水中打設用または気中打設用の無収縮モルタルとしても好適に用いることができる。
Normal Portland cement and early-strength Portland cement are the main cement components, and the bone ratio is 100 / mass of total cement with mass ratio (NC / HC) of ordinary Portland cement to early-strength Portland cement being 25/75 to 75/25. 25-80 parts by mass of the material, 0.3-0.6 parts by mass of the thickener, 23.5-27.5% of the water powder ratio. -75 parts by mass, thickener 0.35-0.55 parts by mass, and water powder ratio 24.0-27.0%, good in-water inseparability, fluidity and strength development are obtained. The properties were also suitably used as grout materials used for underwater placement (No. 1-1 to 1-3, 1-6, 1-7, 1-10, 1-11, 1-14, 1-15). Of course, the mortar which corresponds to the embodiment can also be suitably used as a grout material used for air placement. In addition, even when some of the cement components were replaced by low-heat Portland cement, early-strength Portland cement such as blast furnace cement and ordinary Portland cement, good water inseparability, fluidity and strength development were obtained ( No. 1-18, 1-19). On the other hand, among the mortars corresponding to the comparative examples, the formulation No. In the mortars 1-5, 1-8, 1-12 and 1-17, the inseparability in water is poor, the amount of suspended solids is 50 mg / L or more, and the strength ratio in air is 80%. Not. In addition, blending No. In mortars 1-13 and 1-16, the fluidity is poor and the flow value is less than 220 mm. No. In the mortar of 1-4 and 1-9, the strength expression in the underwater placement is poor, and the compressive strength does not reach 50 N / mm 2 .
In addition, since the mortars corresponding to the examples all show initial expansion, they can be suitably used as non-shrink mortars for underwater placement or in-air placement.
［実施例２］
セメント（ＮＣ／ＨＣが３５／６５）１００質量部に対して、増粘剤０．４５質量部、細骨材３０質量部、消泡剤０．１質量部、発泡剤０．００７質量部、水粉体比２４．５質量％とし、膨張材、ポリカルボン酸系減水剤及びメラミン系減水剤の比率を変化させて、モルタルを作製した。作製したモルタルのセメントの合計１００質量部に対する膨張材、ポリカルボン酸系高性能減水剤及びメラミン系高性能減水剤の配合割合を表４に示した。
[Example 2]
For 100 parts by mass of cement (NC / HC 35/65), 0.45 parts by mass of thickener, 30 parts by mass of fine aggregate, 0.1 parts by mass of antifoaming agent, 0.007 parts by mass of foaming agent, Mortar was prepared by changing the ratio of the swelling material, the polycarboxylic acid-based water reducing agent and the melamine-based water reducing agent to a water powder ratio of 24.5% by mass. Table 4 shows the blending ratio of the expansion material, the polycarboxylic acid-based high-performance water reducing agent, and the melamine-based high-performance water reducing agent with respect to 100 parts by mass of the total mortar cement.
実施例１と同様に、作製したモルタルを上記評価試験方法により評価した。各試験結果を表５に示した。 In the same manner as in Example 1, the produced mortar was evaluated by the above evaluation test method. The test results are shown in Table 5.
セメント１００量部に対して、膨張材０．５〜３．５質量部、減水剤１〜４質量部（減水剤として、ポリカルボン酸系高性能減水剤０．３〜２．０質量部及びメラミン系高性能減水剤０．３〜３．０質量部）を含有するモルタル、特に、膨張材０．７〜３．２質量部、減水剤１．２〜３．８質量部（減水剤として、ポリカルボン酸系減水剤０．４〜１．８質量部及びメラミン系減水剤０．４〜２．８質量部）を含有するモルタルは、良好な水中不分離性、流動性及び強度発現性が得られ、水中打設に用いられるグラウト材としても好適に用いられる性状であった（Ｎｏ．２−１〜２−８）。勿論、当該実施例に当たるモルタルは、気中打設に用いるグラウト材としても好適に用いることができる。
また、実施例に当たるモルタルは、全て初期膨張を示しているので、水中打設用または気中打設用の無収縮モルタルとしても好適に用いることができる。
With respect to 100 parts by weight of cement, 0.5 to 3.5 parts by weight of an expanding material, 1 to 4 parts by weight of a water reducing agent (as a water reducing agent, 0.3 to 2.0 parts by weight of a polycarboxylic acid-based high-performance water reducing agent and Mortar containing melamine-based high-performance water reducing agent (0.3 to 3.0 parts by mass), in particular, 0.7 to 3.2 parts by mass of expansion material, 1.2 to 3.8 parts by mass of water reducing agent (as water reducing agent) Mortar containing 0.4 to 1.8 parts by mass of a polycarboxylic acid-based water reducing agent and 0.4 to 2.8 parts by mass of a melamine-based water reducing agent) is excellent in water inseparability, fluidity and strength development. It was the property used suitably also as a grout material used for underwater placement (No. 2-1 to 2-8). Of course, the mortar which corresponds to the embodiment can also be suitably used as a grout material used for air placement.
In addition, since the mortars corresponding to the examples all show initial expansion, they can be suitably used as non-shrink mortars for underwater placement or in-air placement.
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