JP2018140899A - Polymer cement concrete and method for applying the same - Google Patents
Polymer cement concrete and method for applying the same Download PDFInfo
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- 239000011388 polymer cement concrete Substances 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title description 5
- 239000004568 cement Substances 0.000 claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 19
- 239000002245 particle Substances 0.000 claims abstract description 19
- 229920000642 polymer Polymers 0.000 claims abstract description 15
- 239000007787 solid Substances 0.000 claims abstract description 6
- 239000004480 active ingredient Substances 0.000 claims abstract description 5
- 125000005843 halogen group Chemical group 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 13
- 238000005056 compaction Methods 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims description 5
- 238000007665 sagging Methods 0.000 abstract description 11
- 239000003795 chemical substances by application Substances 0.000 abstract description 6
- 239000004576 sand Substances 0.000 abstract description 4
- 229910052666 hauyne Inorganic materials 0.000 abstract 1
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- -1 calcium aluminate halide Chemical class 0.000 description 6
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 6
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- 229910000831 Steel Inorganic materials 0.000 description 5
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- 229910052791 calcium Inorganic materials 0.000 description 5
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- 229920003048 styrene butadiene rubber Polymers 0.000 description 5
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- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- RGHNJXZEOKUKBD-SQOUGZDYSA-N D-gluconic acid Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C(O)=O RGHNJXZEOKUKBD-SQOUGZDYSA-N 0.000 description 2
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 229910000288 alkali metal carbonate Inorganic materials 0.000 description 2
- 150000008041 alkali metal carbonates Chemical class 0.000 description 2
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- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 2
- 239000004327 boric acid Substances 0.000 description 2
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 2
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 2
- 235000015165 citric acid Nutrition 0.000 description 2
- 238000011161 development Methods 0.000 description 2
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- 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 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
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- 235000002906 tartaric acid Nutrition 0.000 description 2
- 239000011975 tartaric acid Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002562 thickening agent Substances 0.000 description 2
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 description 1
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- KRKNYBCHXYNGOX-UHFFFAOYSA-K Citrate Chemical compound [O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O KRKNYBCHXYNGOX-UHFFFAOYSA-K 0.000 description 1
- RGHNJXZEOKUKBD-UHFFFAOYSA-N D-gluconic acid Natural products OCC(O)C(O)C(O)C(O)C(O)=O RGHNJXZEOKUKBD-UHFFFAOYSA-N 0.000 description 1
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
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- 239000002253 acid Substances 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000012615 aggregate Substances 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910021538 borax Inorganic materials 0.000 description 1
- 235000010338 boric acid Nutrition 0.000 description 1
- 239000011411 calcium sulfoaluminate cement Substances 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
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- 150000002148 esters Chemical class 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011210 fiber-reinforced concrete Substances 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- 235000012208 gluconic acid Nutrition 0.000 description 1
- 239000000174 gluconic acid Substances 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
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- 239000006028 limestone Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 235000011090 malic acid Nutrition 0.000 description 1
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- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 239000011414 polymer cement Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 230000002940 repellent Effects 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 235000002639 sodium chloride Nutrition 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
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- 229920006174 synthetic rubber latex Polymers 0.000 description 1
- 229940095064 tartrate Drugs 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- BSVBQGMMJUBVOD-UHFFFAOYSA-N trisodium borate Chemical compound [Na+].[Na+].[Na+].[O-]B([O-])[O-] BSVBQGMMJUBVOD-UHFFFAOYSA-N 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
Description
本発明は、ポリマーセメントコンクリート及びその施工方法に関する。 The present invention relates to a polymer cement concrete and a construction method thereof.
近年、道路橋等では、ＲＣ床版の輪荷重による疲労せん断破壊や鋼床版のＵリブルート部からの疲労損傷が多数生じており、床版上の舗装の一部を強度の高い材料に置き換えて、床板に作用する力を低減させる対策が講じられている。 In recent years, in road bridges, etc., many fatigue shear failures have occurred due to the wheel load of RC slabs and fatigue damage from the U rib root part of steel slabs. Therefore, measures are taken to reduce the force acting on the floorboard.
このような床版を補強する方法として、例えば、鋼床版の上に、樹脂系塗膜材による防水層を形成し、その防水層の上に鋼繊維補強コンクリート舗装を行う工法（特許文献１参照）、鋼板上面に、ポリマーセメント比が９〜３０重量％であるポリマーセメントモルタル層を接着させる工法（特許文献２参照）が知られている。鋼板等との接着性を高めるために、上記工法で用いるポリマーセメントモルタルには流動性があり、充填性が高いことが求められている。また、ポリマーセメントモルタル層を均一な厚さとするために、振動締固め手段を用いて打設したポリマーセメントモルタルを締固めている（特許文献３参照）。 As a method for reinforcing such a floor slab, for example, a method of forming a waterproof layer made of a resin-based coating material on a steel floor slab and performing steel fiber reinforced concrete pavement on the waterproof layer (Patent Document 1). And a method of bonding a polymer cement mortar layer having a polymer cement ratio of 9 to 30% by weight to the upper surface of the steel sheet (see Patent Document 2). In order to improve the adhesiveness with a steel plate or the like, the polymer cement mortar used in the above method is required to have fluidity and high filling properties. In addition, in order to make the polymer cement mortar layer have a uniform thickness, the polymer cement mortar cast using vibration compaction means is compacted (see Patent Document 3).
しかしながら、勾配を有する床版を補強するような場合、振動締固めを行うときに与える振動によってポリマーセメントモルタルが勾配下方に流れてしまい、均一な厚みを得るのが難しいばかりでなく、流れ出したポリマーセメントモルタルが型枠から溢れ出ることがあった。一方、振動締固めの時間を短くすると、ポリマーセメントモルタルが勾配下方に流れる量を抑えることはできるものの、施工後に表面の平滑性が不十分となり、うねりが発生したり、下地との付着性が十分に得られないという問題があった。 However, in the case of reinforcing a floor slab having a gradient, not only is it difficult to obtain a uniform thickness because the polymer cement mortar flows down the gradient due to vibration applied when vibration compaction is performed, but also the polymer that has flowed out. Cement mortar sometimes overflowed from the formwork. On the other hand, if the time for vibration compaction is shortened, the amount of polymer cement mortar flowing down the gradient can be suppressed, but the surface smoothness becomes insufficient after construction, causing swells and adhesion to the ground. There was a problem that it could not be obtained sufficiently.
そこで、勾配を有するところで振動を与えても流れにくく、施工後の表面の平滑性に優れるポリマーセメントモルタルとして、特定の粒度分布を有する細骨材、セメント用ポリマー、増粘剤及びセメントを含有するポリマーセメントモルタルが提案されている（特許文献４参照）。 Therefore, as a polymer cement mortar that is difficult to flow even when vibration is applied at a gradient and is excellent in surface smoothness after construction, it contains fine aggregate having a specific particle size distribution, cement polymer, thickener and cement. A polymer cement mortar has been proposed (see Patent Document 4).
しかしながら、従来のポリマーセメントモルタルを急勾配（例えば１０％を超えるような勾配）の箇所に施工した場合、ダレが生じてしまうという課題があった。 However, when a conventional polymer cement mortar is applied at a steep portion (for example, a gradient exceeding 10%), there is a problem that sagging occurs.
従って、本発明は、急勾配（例えば、１０％を超えるような勾配）を有する箇所で振動を与えてもダレが生じにくく、下地との付着性が良好なポリマーセメントコンクリートを提供することを目的とする。 Accordingly, an object of the present invention is to provide a polymer cement concrete that is less likely to sag even when vibration is applied at a portion having a steep slope (for example, a slope exceeding 10%) and has good adhesion to the ground. And
本発明者は、上記課題を解決すべく検討したところ、ポリマーセメントコンクリートの構成材料として、速硬性セメント、骨材、セメント用ポリマー、水及び凝結遅延剤を特定の配合量で使用し、且つ細骨材率（全骨材（細骨材＋粗骨材）に対する細骨材の容積比率（以下％表示））を特定の数値範囲とすることで、上記課題を解決できることを見出した。 The present inventor has studied to solve the above-mentioned problems. As a constituent material of polymer cement concrete, the present inventor used fast-setting cement, aggregate, cement polymer, water and setting retarder in a specific blending amount, It has been found that the above problem can be solved by setting the aggregate ratio (the volume ratio of fine aggregate to the total aggregate (fine aggregate + coarse aggregate) (hereinafter referred to as%)) within a specific numerical range.
即ち、本発明は、（Ａ）速硬性セメント１００質量部、（Ｂ）骨材５７５〜７５０質量部、（Ｃ）セメント用ポリマー８〜１８質量部（固形分換算）、（Ｄ）水３５〜４５質量部及び（Ｅ）凝結遅延剤１〜１０質量部を含有し、且つ細骨材率が４０〜５０％であることを特徴とするポリマーセメントコンクリートである。 That is, the present invention includes (A) 100 parts by mass of fast-setting cement, (B) 575 to 750 parts by mass of aggregate, (C) 8 to 18 parts by mass of polymer for cement (in terms of solid content), (D) 35 to 35 parts of water. It is a polymer cement concrete containing 45 parts by mass and (E) 1-10 parts by mass of a setting retarder and having a fine aggregate ratio of 40-50%.
本発明によれば、急勾配（例えば、１０％を超えるような勾配）の箇所で振動を与えてもダレが生じにくく、下地との付着性が良好なポリマーセメントコンクリートを提供することができる。 ADVANTAGE OF THE INVENTION According to this invention, even if it gives a vibration in the location of a steep gradient (for example, gradient exceeding 10%), dripping does not arise easily and polymer cement concrete with favorable adhesiveness with a foundation | substrate can be provided.
以下、本発明を詳細に説明する。
本発明のポリマーセメントコンクリートは、（Ａ）速硬性セメントと、（Ｂ）骨材と、（Ｃ）セメント用ポリマーと、（Ｄ）水と、（Ｅ）凝結遅延剤とを必須成分として含有するものである。
Hereinafter, the present invention will be described in detail.
The polymer cement concrete of the present invention contains (A) a fast-curing cement, (B) an aggregate, (C) a polymer for cement, (D) water, and (E) a setting retarder as essential components. Is.
本発明に用いる（Ａ）速硬性セメントは、カルシウムアルミネート類を有効成分として含有するものが好ましく、１１ＣａＯ・７Ａｌ２Ｏ３・ＣａＸ２（Ｘはハロゲン原子を示す）又は３ＣａＯ・３Ａｌ２Ｏ３・ＣａＳＯ４（アウイン）を有効成分として含有するものがより好ましい。１１ＣａＯ・７Ａｌ２Ｏ３・ＣａＸ２は、いわゆるカルシウムアルミネートハロゲン化物系セメントである。ハロゲン原子としては、フッ素原子が好ましい。また、アウインは、カルシウムサルホアルミネート系セメント（アウイン系セメント）とも称されるものである。これらは超速硬セメントと呼ばれるものであり、商品名ジェットセメント若しくはスーパージェットセメントとして市販されている。本発明に用いる（Ａ）速硬性セメントとしてはアウイン系セメントが最も好ましい。
また、カルシウムアルミネート類としては、この他にもＣａＯをＣ、Ａｌ２Ｏ３をＡ、Ｆｅ２Ｏ３をＦで表示した場合、Ｃ３Ａ、Ｃ２Ａ、Ｃ１２Ａ７、Ｃ５Ａ３、ＣＡ、Ｃ３Ａ５又はＣＡ２等と表示される鉱物組成を有するカルシウムアルミネート、Ｃ２ＡＦ、Ｃ４ＡＦ等と表示されるカルシウムアルミノフェライト、アルミナセメント、並びにこれらにＳｉＯ２、Ｋ２Ｏ、Ｆｅ２Ｏ３、ＴｉＯ２等が固溶又は化合したもの等が含まれる。なお、カルシウムアルミネート類は結晶質、非晶質のいずれであってもよい。これらのカルシウムアルミネート類と石膏等の無機塩類を配合して調製された速硬性混和材を、ポルトランドセメントに添加したものも速硬性セメントとして用いることができる。
さらに、速硬性セメントの一部をポルトランドセメントに置き換えてもよい。ここで、ポルトランドセメントとしては、普通ポルトランドセメント、早強ポルトランドセメント、超早強ポルトランドセメント、中庸熱ポルトランドセメント、低熱ポルトランドセメント等が使用できる。その置き換え量は、可使時間の確保、早期強度発現性及び繰返し載荷に対する耐久性の点から、速硬性セメントの２０質量％以下であることが好ましい。
The (A) fast-curing cement used in the present invention preferably contains calcium aluminate as an active ingredient, and is 11CaO · 7Al 2 O 3 · CaX 2 (X represents a halogen atom) or 3CaO · 3Al 2 O 3. those containing · CaSO 4 (Auin) as an active ingredient are more preferred. 11CaO · 7Al 2 O 3 · CaX 2 is a so-called calcium aluminate halide cement. As the halogen atom, a fluorine atom is preferable. Auin is also called calcium sulfoaluminate cement (auin cement). These are called super fast cements and are marketed under the trade name jet cement or super jet cement. As the fast-curing cement (A) used in the present invention, Auin-based cement is most preferable.
In addition, as calcium aluminates, when CaO is represented by C, Al 2 O 3 by A, and Fe 2 O 3 by F, C 3 A, C 2 A, C 12 A 7 , C 5 Calcium aluminate having a mineral composition indicated as A 3 , CA, C 3 A 5 or CA 2, calcium aluminoferrite indicated as C 2 AF, C 4 AF, etc., alumina cement, and SiO 2 , Examples include those in which K 2 O, Fe 2 O 3 , TiO 2, or the like is dissolved or combined. Calcium aluminates may be either crystalline or amorphous. A quick-hardening admixture prepared by blending these calcium aluminates and inorganic salts such as gypsum added to Portland cement can also be used as the fast-hardening cement.
Furthermore, a part of the fast-curing cement may be replaced with Portland cement. Here, as Portland cement, normal Portland cement, early-strength Portland cement, ultra-early strong Portland cement, moderately hot Portland cement, low heat Portland cement, etc. can be used. The amount of replacement is preferably 20% by mass or less of the fast-curing cement from the viewpoint of securing the pot life, early strength development, and durability against repeated loading.
本発明に用いる（Ｂ）骨材は、コンクリートで通常使用される骨材であれば特に限定されるものではない。例えば、細骨材でいえば、川砂、珪砂、砕砂、寒水石、石灰石砂、スラグ骨材等が挙げられる。粗骨材でいえば、川砂利、陸砂利、砕石、人工粗骨材、スラグ粗骨材、再生粗骨材等が挙げられる。
細骨材の粒度は、通常、１０ｍｍふるいを全通し、５ｍｍふるいを８５質量％以上通過するものであればよい。ダレ性および施工性の点から、最大粒径５ｍｍ以下であり、且つ粒径０．１５ｍｍ以下の粒子の割合が２５質量％以下である細骨材が好ましく、最大粒径５ｍｍ以下であり、且つ粒径０．１５ｍｍ以下の粒子の割合が２０質量％以下である細骨材がより好ましい。
粗骨材の粒度は、通常、５ｍｍふるいに８５質量％以上とどまるものであればよい。コンシステンシーの点から、最小粒径５ｍｍ以上であり、且つ最大粒径２５ｍｍ以下である粗骨材が好ましく、最小粒径５ｍｍ以上であり、且つ最大粒径２０ｍｍ以下である粗骨材がより好ましい。
(B) Aggregate used for this invention will not be specifically limited if it is an aggregate normally used with concrete. Examples of fine aggregates include river sand, quartz sand, crushed sand, cryolite, limestone sand, and slag aggregate. Examples of coarse aggregates include river gravel, land gravel, crushed stone, artificial coarse aggregate, slag coarse aggregate, recycled coarse aggregate, and the like.
The particle size of the fine aggregate is usually sufficient as long as it passes through the 10 mm sieve and passes through the 5 mm sieve by 85% by mass or more. From the viewpoint of sagging properties and workability, a fine aggregate having a maximum particle size of 5 mm or less and a ratio of particles having a particle size of 0.15 mm or less is preferably 25% by mass or less, and having a maximum particle size of 5 mm or less, and A fine aggregate in which the proportion of particles having a particle size of 0.15 mm or less is 20% by mass or less is more preferable.
The particle size of the coarse aggregate is usually only required to be 85% by mass or more in a 5 mm sieve. From the viewpoint of consistency, a coarse aggregate having a minimum particle size of 5 mm or more and a maximum particle size of 25 mm or less is preferable, and a coarse aggregate having a minimum particle size of 5 mm or more and a maximum particle size of 20 mm or less is more preferable. .
（Ｂ）骨材の配合量は、（Ａ）速硬性セメント１００質量部に対して、５７５〜７５０質量部であり、６００〜７２５質量部であることが好ましく、６２５〜７００質量部であることがより好ましい。（Ｂ）骨材の配合量が５７５質量部未満であると、可使時間の確保が困難となったり、勾配を有する箇所への打設の際にダレを生じる恐れがある。一方、（Ｂ）骨材の配合量が７５０質量部を超えると、施工性が悪くなったり、下地との付着性が低下する恐れがある。骨材における細骨材率は、４０〜５０％であり、４１．５〜４８％であることが好ましい。細骨材率が４０％未満であると、施工性が悪くなったり、勾配を有する箇所への打設の際にダレを生じる恐れがある。一方、細骨材率が５０％を超えると、施工性が悪くなったり、下地との付着性が低下する恐れがある。 (B) The amount of aggregate is 575-750 parts by mass, preferably 600-725 parts by mass, and 625-700 parts by mass with respect to 100 parts by mass of (A) fast-curing cement. Is more preferable. (B) If the amount of the aggregate is less than 575 parts by mass, it may be difficult to secure the pot life, or sagging may occur when placing in a portion having a gradient. On the other hand, if the blending amount of (B) aggregate exceeds 750 parts by mass, the workability may be deteriorated or the adhesion to the ground may be lowered. The fine aggregate ratio in the aggregate is 40 to 50%, preferably 41.5 to 48%. If the fine aggregate ratio is less than 40%, the workability may be deteriorated, or sagging may occur when placing in a portion having a gradient. On the other hand, if the fine aggregate ratio exceeds 50%, the workability may be deteriorated or the adhesion to the ground may be lowered.
本発明に用いる（Ｃ）セメント用ポリマーは、ＪＩＳ Ａ ６２０３「セメント混和用ポリマーディスパージョン及び再乳化形粉末樹脂」に規定されるポリマーであることが好ましい。このようなセメント用ポリマーとしては、ポリマーディスパージョン及び再乳化形粉末樹脂が挙げられる。ポリマーディスパージョンとしては、スチレンブタジエンゴム等の合成ゴム系；天然ゴム系；ゴムアスファルト系；エチレン酢酸ビニル系；アクリル酸エステル系；樹脂アスファルト系が好ましい。これらの中でも、合成ゴム系が好ましく、合成ゴムラテックス、ポリアクリル酸エステル、エチレン酢酸ビニルがより好ましく、コンクリートとの接着性の点から、スチレンブタジエンゴムが最も好ましい。スチレンブタジエンゴムは、スチレンとブタジエンを共重合した合成ゴムの一種であり、スチレン含有量や加硫量により品質が調整される。セメント混和用のスチレンブタジエンゴムとしては、安定性及び接着性に優れるという点から、結合スチレン量が５０〜７０質量％のものが好ましい。 The polymer for cement (C) used in the present invention is preferably a polymer specified in JIS A 6203 “Polymer dispersion for cement admixture and re-emulsifying powder resin”. Such cement polymers include polymer dispersions and re-emulsifying powder resins. The polymer dispersion is preferably a synthetic rubber such as styrene butadiene rubber; a natural rubber; a rubber asphalt; an ethylene vinyl acetate; an acrylate ester; or a resin asphalt. Among these, a synthetic rubber system is preferable, synthetic rubber latex, polyacrylic acid ester, and ethylene vinyl acetate are more preferable, and styrene butadiene rubber is most preferable from the viewpoint of adhesion to concrete. Styrene butadiene rubber is a kind of synthetic rubber obtained by copolymerizing styrene and butadiene, and the quality is adjusted by the styrene content and the vulcanization amount. As the styrene butadiene rubber for mixing with cement, a styrene butadiene rubber having a bound styrene amount of 50 to 70% by mass is preferable from the viewpoint of excellent stability and adhesiveness.
（Ｃ）セメント用ポリマーの配合量は、（Ａ）速硬性セメント１００質量部に対して、固形分換算で８〜１８質量部であり、１０〜１６質量部であることが好ましい。（Ｃ）セメント用ポリマーの配合量が８質量部未満であると、金属やコンクリートとの付着強度が十分に確保できない恐れがある。一方、（Ｃ）セメント用ポリマーの配合量が１８質量部を超えると、勾配を有する箇所への打設の際にダレを生じる恐れがある。 (C) The compounding quantity of the polymer for cement is 8-18 mass parts in conversion of solid content with respect to 100 mass parts of (A) quick-hardening cement, and it is preferable that it is 10-16 mass parts. (C) When the compounding quantity of the polymer for cement is less than 8 mass parts, there exists a possibility that adhesive strength with a metal or concrete cannot fully be ensured. On the other hand, if the blending amount of the polymer for (C) cement exceeds 18 parts by mass, sagging may occur at the time of placing in a portion having a gradient.
（Ｄ）水の配合量は、（Ａ）速硬性セメント１００質量部に対して、３５〜４５質量部であり、３７〜４３質量部であることが好ましい。（Ｄ）水の配合量が３５質量部未満であると、施工性が低下する恐れがある。一方、（Ｄ）水の配合量が４５質量部を超えると、勾配を有する箇所への打設の際にダレを生じる恐れがある。 (D) The compounding quantity of water is 35-45 mass parts with respect to 100 mass parts of (A) quick-hardening cement, and it is preferable that it is 37-43 mass parts. (D) There exists a possibility that workability may fall that the compounding quantity of water is less than 35 mass parts. On the other hand, when the blending amount of (D) water exceeds 45 parts by mass, sagging may occur during placement in a portion having a gradient.
本発明に用いる（Ｅ）凝結遅延剤としては、例えば、クエン酸、グルコン酸、リンゴ酸、酒石酸などの有機酸又はそれらの塩、ホウ酸、ホウ酸ナトリウム等のホウ酸塩、リン酸塩、アルカリ金属炭酸塩、アルカリ金属重炭酸塩などの無機塩、糖類などの群から選ばれる少なくとも一種を含むものが挙げられる。これらの中でも、クエン酸、クエン酸塩、酒石酸、酒石酸塩、アルカリ金属炭酸塩の群から選ばれる少なくとも一種を含むものが好ましい。凝結遅延剤は、粉状体、液状体（例えば、水溶液、エマルジョン、懸濁液の形態）いずれであってもかまわない。凝結遅延剤を一定量添加することで流動性の微調整が可能となり、結果として、勾配を有する箇所への打設の際にダレを生じにくくさせることができる。 Examples of the (E) setting retarder used in the present invention include organic acids such as citric acid, gluconic acid, malic acid and tartaric acid or salts thereof, boric acid such as boric acid and sodium borate, phosphates, Examples include those containing at least one selected from the group consisting of inorganic salts such as alkali metal carbonates and alkali metal bicarbonates, and saccharides. Among these, those containing at least one selected from the group of citric acid, citrate, tartaric acid, tartrate, and alkali metal carbonate are preferable. The setting retarder may be in the form of powder or liquid (for example, in the form of an aqueous solution, emulsion or suspension). By adding a certain amount of the setting retarder, it is possible to finely adjust the fluidity, and as a result, it is possible to make it difficult for sagging to occur at the time of placing in a portion having a gradient.
（Ｅ）凝結遅延剤の配合量は、（Ａ）速硬性セメント１００質量部に対して、凝結遅延剤中の有効成分（固形成分）として１〜１０質量部であり、１．５〜５質量部であることが好ましい。（Ｅ）凝結遅延剤の配合量が１質量部未満であると、可使時間の確保が困難となり充填不足になる恐れがある。一方、（Ｅ）凝結遅延剤の配合量が１０質量部を超えると、流動性が悪くなる恐れがある。 (E) The compounding quantity of a setting retarder is 1-10 mass parts as an active ingredient (solid component) in a setting retarder with respect to 100 mass parts of (A) quick-hardening cement, and 1.5-5 mass Part. (E) When the compounding amount of the setting retarder is less than 1 part by mass, it is difficult to ensure the pot life and the filling may be insufficient. On the other hand, if the blending amount of (E) the setting retarder exceeds 10 parts by mass, the fluidity may be deteriorated.
本発明のポリマーセメントコンクリートには、（Ｆ）減水剤を更に含有させてもよい。（Ｆ）減水剤を配合することにより、ポリマーセメントコンクリートの流動性を向上させることができる。本発明に用いることのできる（Ｆ）減水剤には、高性能減水剤、高性能ＡＥ減水剤、ＡＥ減水剤、流動化剤が含まれる。このような減水剤としては、ＪＩＳ Ａ ６２０４「コンクリート用化学混和剤」に規定される減水剤が挙げられる。具体的には、ポリカルボン酸系減水剤、ナフタレンスルホン酸系減水剤、リグニンスルホン酸系減水剤及びアクリル系減水剤が挙げられる。これらの中でも、ナフタレンスルホン酸系減水剤が好ましい。 The polymer cement concrete of the present invention may further contain (F) a water reducing agent. (F) The fluidity | liquidity of a polymer cement concrete can be improved by mix | blending a water reducing agent. The water reducing agent (F) that can be used in the present invention includes a high performance water reducing agent, a high performance AE water reducing agent, an AE water reducing agent, and a fluidizing agent. Examples of such a water reducing agent include water reducing agents specified in JIS A 6204 “Chemical admixture for concrete”. Specific examples include polycarboxylic acid-based water reducing agents, naphthalene sulfonic acid-based water reducing agents, lignin sulfonic acid-based water reducing agents, and acrylic water reducing agents. Among these, naphthalenesulfonic acid-based water reducing agents are preferable.
（Ｆ）減水剤を用いる場合、その配合量は、（Ａ）速硬性セメント１００質量部に対して、０．５〜１０質量部であることが好ましく、１〜５質量部であることがより好ましい。（Ｆ）減水剤の配合量が０．５質量部未満であると、流動性の向上効果が得られない恐れがある。一方、（Ｆ）減水剤の配合量が１０質量部を超えると、初期強度発現性が低下する恐れがある。 (F) When using a water reducing agent, the compounding quantity is preferably 0.5 to 10 parts by mass and more preferably 1 to 5 parts by mass with respect to 100 parts by mass of (A) fast-setting cement. preferable. (F) There exists a possibility that the improvement effect of fluidity | liquidity may not be acquired as the compounding quantity of a water reducing agent is less than 0.5 mass part. On the other hand, if the blending amount of (F) the water reducing agent exceeds 10 parts by mass, the initial strength development may be reduced.
本発明のポリマーセメントコンクリートには、（Ｇ）膨張材を更に含有させてもよい。（Ｇ）膨張材を配合することにより、ポリマーセメントコンクリートの収縮率を調整しやすくなる。本発明に用いることのできる（Ｇ）膨張材としては、アウインを主成分とするカルシウムサルホアルミネート系膨張材、遊離石灰を主成分とする石灰系膨張材等があり、これらいずれの膨張材も使用できる。 The polymer cement concrete of the present invention may further contain (G) an expanding material. (G) It becomes easy to adjust the shrinkage rate of polymer cement concrete by mix | blending an expander. Examples of the expandable material (G) that can be used in the present invention include calcium sulfoaluminate-based expandable materials containing Auin as a main component, lime-based expandable materials based on free lime, and any of these expandable materials. Can be used.
（Ｇ）膨張材を用いる場合、その配合量は、（Ａ）速硬性セメント１００質量部に対して、０．５〜５質量部であることが好ましく、１〜３質量部であることがより好ましい。（Ｇ）膨張材の配合量が０．５質量部未満であると、収縮率を調整できない恐れがある。一方、（Ｇ）膨張材の配合量が５質量部を超えると、過膨張となりひび割れの恐れがある。 (G) When using an expandable material, it is preferable that the compounding quantity is 0.5-5 mass parts with respect to 100 mass parts of (A) quick-hardening cement, and it is more preferable that it is 1-3 mass parts. preferable. (G) If the amount of the expanded material is less than 0.5 parts by mass, the shrinkage rate may not be adjusted. On the other hand, if the blending amount of (G) the expansion material exceeds 5 parts by mass, it will overexpand and there is a risk of cracking.
更に、本発明の効果が損なわれない範囲で、本発明のポリマーセメントコンクリートに当該技術分野で公知の混和剤を添加してもよい。そのような混和剤としては、例えば、消泡剤、防水剤、防錆剤、収縮低減剤、増粘剤、保水剤、顔料、撥水剤、白華防止剤、繊維等が挙げられる。 Furthermore, an admixture known in the art may be added to the polymer cement concrete of the present invention as long as the effects of the present invention are not impaired. Examples of such admixtures include antifoaming agents, waterproofing agents, rustproofing agents, shrinkage reducing agents, thickeners, water retention agents, pigments, water repellents, whitening prevention agents, and fibers.
本発明のポリマーセメントコンクリートの製造方法は、通常のポリマーセメントモルタル若しくはコンクリートと同様であり、特に限定されない。ポリマーセメントコンクリートの構成材料の混練に使用する器具としては、例えば、ホバートミキサ、ハンドミキサ、傾胴ミキサ、２軸ミキサ等が挙げられる。 The method for producing the polymer cement concrete of the present invention is the same as ordinary polymer cement mortar or concrete, and is not particularly limited. Examples of the equipment used for kneading the constituent material of the polymer cement concrete include a Hobart mixer, a hand mixer, a tilting mixer, and a biaxial mixer.
本発明のポリマーセメントコンクリートの施工方法は、上述したポリマーセメントコンクリートを、５〜２０％の勾配、好ましくは１０〜１５％の勾配を有する箇所に打設した後、振動締固めを行うことを含むものである。本発明のポリマーセメントコンクリートは、振動を与えてもダレが生じにくいので、１０％を超えるような急勾配の箇所においても良好に施工することができる。 The construction method of the polymer cement concrete of the present invention includes placing the polymer cement concrete described above in a place having a gradient of 5 to 20%, preferably 10 to 15%, and then performing vibration compaction. It is a waste. Since the polymer cement concrete of the present invention is unlikely to sag even when vibration is applied, it can be applied well even at a steep location exceeding 10%.
以下、本発明の実施例に基づいて、本発明を更に説明するが、本発明はこれらに限定されるものではない。使用した構成材料の詳細を表１に示す。 EXAMPLES Hereinafter, although this invention is further demonstrated based on the Example of this invention, this invention is not limited to these. Details of the constituent materials used are shown in Table 1.
［ポリマーセメントコンクリートの配合設計］
速硬性セメント１００質量部に対して、細骨材、粗骨材、セメント用ポリマー（固形分換算）、水及び凝結遅延剤を表２に示される配合設計とした。
[Polymer cement concrete mix design]
The fine aggregate, coarse aggregate, cement polymer (in terms of solid content), water, and setting retarder were formulated as shown in Table 2 with respect to 100 parts by mass of the fast-curing cement.
［ポリマーセメントコンクリートの作製］
２３±２℃環境下において、ポリマーディスパージョンを５０Ｌ傾胴ミキサに添加し、表２で配合設計したポリマーセメントコンクリート（粗骨材以外）を添加し、６０秒間混練した。その後、粗骨材を添加し、６０秒間更に混練してポリマーセメントコンクリートを作製した。なお、ポリマーセメントコンクリートの練混ぜ量は、１バッチ当たり約３５Ｌに設定した。
[Production of polymer cement concrete]
In an environment of 23 ± 2 ° C., the polymer dispersion was added to a 50 L tilt cylinder mixer, and the polymer cement concrete (other than coarse aggregate) blended and designed in Table 2 was added and kneaded for 60 seconds. Thereafter, coarse aggregate was added and further kneaded for 60 seconds to prepare polymer cement concrete. The mixing amount of the polymer cement concrete was set to about 35 L per batch.
［評価方法］
＜コンシステンシー＞
ＪＩＳ Ａ １１０１「コンクリートのスランプ試験方法」に準じて、２３±２℃環境下で測定した。なお、１．５ｃｍ以上のスランプ値であれば、コンシステンシーが良好であると判断した。結果を表３に示す。
＜付着強度＞
２３±２℃環境下において、ＪＩＳ平板（３００×３００×１００ｍｍ）にポリマーセメントコンクリートを５０ｍｍ打重ね、試験体を作製した。試験体は、材齢２８日まで気中養生し、φ１００ｍｍでの付着強度を測定した。なお、１．５Ｎ／ｍｍ２以上の付着強度であれば、付着性が良好であると判断した。結果を表３に示す。
＜ダレ性＞
２３±２℃環境下において、縦１８００ｍｍ×横９００ｍｍ×厚さ５０ｍｍの木製型枠（縦断勾配１２％）に厚さ５０ｍｍでポリマーセメントコンクリートを打設し、バイブレーターにより底部から上部にかけて振動締固めを行った。バイブレーターにより締固めている間にポリマーセメントコンクリートにダレが生じて厚さ５０ｍｍの底部から溢れるか否かを目視により確認した。溢れなかったものを○、溢れたものを×とした。結果を表３に示す。
＜施工性＞
ダレ性の評価と同様に、木製型枠にポリマーセメントコンクリートを打設し、バイブレーターによる振動締固め作業が全面に亘ってできるか否かを確認した。作業できた場合を○、作業できなかった場合を×とした。結果を表３に示す。
[Evaluation method]
<Consistency>
In accordance with JIS A 1101 “Concrete slump test method”, the measurement was performed in an environment of 23 ± 2 ° C. In addition, if the slump value was 1.5 cm or more, it was judged that the consistency was good. The results are shown in Table 3.
<Adhesion strength>
Under an environment of 23 ± 2 ° C., 50 mm of polymer cement concrete was placed on a JIS flat plate (300 × 300 × 100 mm) to prepare a test specimen. The test body was cured in air until the age of 28 days, and the adhesion strength at φ100 mm was measured. In addition, if the adhesion strength was 1.5 N / mm 2 or more, it was judged that the adhesion was good. The results are shown in Table 3.
<Sagging>
In a 23 ± 2 ° C environment, polymer cement concrete is placed in a wooden formwork (longitudinal gradient 12%) with a length of 1800 mm × width 900 mm × thickness 50 mm. went. It was visually confirmed whether or not the polymer cement concrete sags and overflows from the bottom having a thickness of 50 mm while being compacted by the vibrator. Those that did not overflow were marked with ◯, and those that overflowed were marked with ×. The results are shown in Table 3.
<Workability>
Similar to the evaluation of sagging property, polymer cement concrete was placed on a wooden formwork, and it was confirmed whether or not the vibration compaction work by the vibrator could be performed over the entire surface. The case where the work was able to be done was marked as ◯, and the case where the work could not be done was marked as x. The results are shown in Table 3.
表３から分かるように、実施例であるＮｏ．１〜３、６、７、１０、１１、１４、１５、１８及び１９のポリマーセメントコンクリートは、１０％を超える勾配の箇所で振動を与えてもダレを生じずに施工でき、且つ下地コンクリートとの付着性が良好であった。これに対し、Ｎｏ．４、８、１３及び２１のポリマーセメントコンクリートは、付着強度が１．５Ｎ／ｍｍ２未満であり、下地コンクリートとの付着性が不十分であった。また、Ｎｏ．５、９、１２及び１６のポリマーセメントコンクリートは、ダレが生じて型枠底部からの溢れが確認された。Ｎｏ．４、１７及び２０は、スランプ値が小さく、コンシステンシーが不良であった。 As can be seen from Table 3, the example No. 1 to 3, 6, 7, 10, 11, 14, 15, 18 and 19 polymer cement concrete can be applied without causing sag even if vibration is applied at a slope of more than 10%, The adhesion of was good. In contrast, no. The polymer cement concretes 4, 8, 13 and 21 had an adhesion strength of less than 1.5 N / mm 2 and insufficient adhesion to the ground concrete. No. In the polymer cement concretes 5, 9, 12 and 16, sagging occurred and overflow from the bottom of the mold was confirmed. No. 4, 17 and 20 had a small slump value and poor consistency.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03141145A (en) * | 1989-10-25 | 1991-06-17 | Chichibu Cement Co Ltd | Polymer cement concrete product and production thereof |
| JPH05310461A (en) * | 1992-05-12 | 1993-11-22 | Marumi Kasei Kk | Production of polymer cement concrete |
| JP2012171853A (en) * | 2011-02-24 | 2012-09-10 | Taiheiyo Cement Corp | Hydraulic composition |
| JP2016121030A (en) * | 2014-12-24 | 2016-07-07 | 太平洋マテリアル株式会社 | Fiber-reinforced cement composite material and method of producing the same |
| JP2016166108A (en) * | 2015-03-10 | 2016-09-15 | 株式会社トクヤマ | Ultra rapid hardening type high toughness fiber-reinforced concrete |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03141145A (en) * | 1989-10-25 | 1991-06-17 | Chichibu Cement Co Ltd | Polymer cement concrete product and production thereof |
| JPH05310461A (en) * | 1992-05-12 | 1993-11-22 | Marumi Kasei Kk | Production of polymer cement concrete |
| JP2012171853A (en) * | 2011-02-24 | 2012-09-10 | Taiheiyo Cement Corp | Hydraulic composition |
| JP2016121030A (en) * | 2014-12-24 | 2016-07-07 | 太平洋マテリアル株式会社 | Fiber-reinforced cement composite material and method of producing the same |
| JP2016166108A (en) * | 2015-03-10 | 2016-09-15 | 株式会社トクヤマ | Ultra rapid hardening type high toughness fiber-reinforced concrete |
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