JP2017114734A - Super quick hardening cement mortar - Google Patents
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- JP2017114734A JP2017114734A JP2015253193A JP2015253193A JP2017114734A JP 2017114734 A JP2017114734 A JP 2017114734A JP 2015253193 A JP2015253193 A JP 2015253193A JP 2015253193 A JP2015253193 A JP 2015253193A JP 2017114734 A JP2017114734 A JP 2017114734A
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- 239000011083 cement mortar Substances 0.000 title claims abstract description 39
- 239000000463 material Substances 0.000 claims abstract description 63
- 230000003068 static effect Effects 0.000 claims abstract description 44
- 239000011230 binding agent Substances 0.000 claims abstract description 28
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000004568 cement Substances 0.000 claims abstract description 19
- 239000000843 powder Substances 0.000 claims description 32
- 239000011347 resin Substances 0.000 claims description 29
- 229920005989 resin Polymers 0.000 claims description 29
- 239000003795 chemical substances by application Substances 0.000 claims description 14
- 239000011433 polymer cement mortar Substances 0.000 claims description 13
- 230000008719 thickening Effects 0.000 claims description 10
- 239000000654 additive Substances 0.000 claims description 7
- 230000000996 additive effect Effects 0.000 claims description 7
- 229920001059 synthetic polymer Polymers 0.000 claims description 7
- 239000002562 thickening agent Substances 0.000 claims description 3
- 239000004567 concrete Substances 0.000 abstract description 13
- 230000000977 initiatory effect Effects 0.000 abstract 1
- 230000002787 reinforcement Effects 0.000 abstract 1
- 238000010998 test method Methods 0.000 description 11
- 239000000203 mixture Substances 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 230000007423 decrease Effects 0.000 description 6
- 239000010426 asphalt Substances 0.000 description 5
- 239000004570 mortar (masonry) Substances 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 5
- 239000004576 sand Substances 0.000 description 5
- 239000011398 Portland cement Substances 0.000 description 3
- 238000004898 kneading Methods 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 239000011414 polymer cement Substances 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 239000012615 aggregate Substances 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
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 1
- 239000011400 blast furnace cement Substances 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910001388 sodium aluminate Inorganic materials 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 239000000021 stimulant Substances 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
本発明は、流動性に優れると共に可使時間が長く、初期強度の発現性に優れ、長さ変化率および静弾性係数が小さいセメントモルタルに関し、好ましくは、さらに再乳化粉末樹脂を含有して凍結融解抵抗性に優れたポリマーセメントモルタルに関する。 The present invention relates to a cement mortar that has excellent fluidity, long pot life, excellent initial strength, small length change rate and small static elastic modulus, and preferably contains a re-emulsified powder resin and is frozen. The present invention relates to a polymer cement mortar having excellent melting resistance.
コンクリート床版アスファルト舗装路面の劣化した凹部に補修材を充填することが行われている。従来、補修材として以下の材料が知られている。(イ)骨材と繊維を含み加熱した改質アスファルト乳剤混合物。(ロ)粗骨材をアスファルト被覆して表面に被覆砂を設けた材料。(ハ)熱硬化性樹脂など主成分とする改質アスファルト乳剤、セメント、骨材、およびフィラーなどを含有する補修材。 Filling repair material into a degraded recess in a concrete floor slab asphalt pavement is being carried out. Conventionally, the following materials are known as repair materials. (A) A modified asphalt emulsion mixture containing aggregates and fibers and heated. (B) A material in which coarse aggregate is coated with asphalt and coated sand is provided on the surface. (C) A repair material containing a modified asphalt emulsion mainly composed of a thermosetting resin, cement, aggregate, filler, and the like.
しかし、アスファルトを主成分とした補修材をコンクリート床版の劣化凹部に用いると、強度が低いために補修部分が弱くなる。また、熱硬化性樹脂を結合材とする補修材は、充填量が多いと熱収縮による空隙が生じる懸念がある。 However, when a repair material mainly composed of asphalt is used for the deteriorated concave portion of the concrete floor slab, the repair portion becomes weak because of its low strength. Moreover, there is a concern that a repair material using a thermosetting resin as a binder has a void due to heat shrinkage when the filling amount is large.
上記問題を生じない補修材として用いることができ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１）。このポリマーセメントモルタルは、急硬性セメント、セメント用ポリマー、細骨材、および水を含有し、単位ポリマー量、水セメント比、ポリマーセメント比を所定範囲にして、コンクリート床版の劣化凹部に充填できるようにした補修材である。 A polymer cement mortar that can be used as a repair material that does not cause the above problem has been proposed (Patent Document 1). This polymer cement mortar contains rapid-setting cement, cement polymer, fine aggregate, and water, and can fill the deteriorated recesses of concrete floor slabs with the unit polymer amount, water cement ratio, and polymer cement ratio within a predetermined range. This is the repair material.
上記ポリマーセメントモルタルの補修材は、現場での混練作業が煩雑であり、また、混和液の調製の際に計量誤差によって所要の品質性能が確保できない場合がある。さらに単位ポリマー量およびポリマーセメント比が大きく、高価なポリマーの使用量が多いのでコスト高になる問題がある。 The above-mentioned repair material for polymer cement mortar requires complicated on-site kneading work, and sometimes the required quality performance cannot be ensured due to a measurement error when preparing the admixture. Furthermore, there is a problem that the unit polymer amount and the polymer cement ratio are large and the amount of expensive polymer used is large, resulting in high costs.
また、超速硬型のポリマーセメントモルタルは、水和反応速度が速く、発熱温度が高くなり、また水和反応初期に多量のエトリンガイトを生成するため、初期の膨張量が大きくなる傾向がある。このため、既設コンクリート床版の補修材として使用すると、補修部分において躯体コンクリート床版と補修材との境界に歪が生じ易く、付着強度が低下し、再劣化が生じる。また、水セメント比が小さいために材齢28日の強度が大きくなると、静弾性係数も大きくなり、既設コンクリート床版と補修材の静弾性係数の差が大きくなる。この状態で補修後に交通開放して繰返し荷重が掛かると、既設コンクリート床版と補修材との境界にせん断力が生じ、境界から再劣化が生じる。一方、静弾性係数を小さくするためにポリマーを一定量以上添加した場合、初期の膨張量が大きくなり、材料コストも増大するなどの問題がある。 In addition, the ultrafast hardening type polymer cement mortar has a high hydration reaction rate, a high exothermic temperature, and generates a large amount of ettringite at the initial stage of the hydration reaction, so that the initial expansion amount tends to increase. For this reason, when used as a repair material for an existing concrete floor slab, the boundary between the concrete floor slab and the repair material is likely to be distorted in the repaired portion, the adhesion strength is reduced, and re-deterioration occurs. In addition, when the strength of the material age 28 days increases due to the small water cement ratio, the static elastic modulus also increases, and the difference in static elastic modulus between the existing concrete floor slab and the repair material increases. In this state, when the traffic is opened after repair and a repeated load is applied, a shearing force is generated at the boundary between the existing concrete floor slab and the repair material, and re-deterioration occurs from the boundary. On the other hand, when a certain amount or more of polymer is added in order to reduce the static elastic modulus, there is a problem that the initial expansion amount increases and the material cost also increases.
本発明は、上記問題を解決したものであり、長さ変化率が小さく、静弾性係数が一定範囲に抑制されており、可使時間が長く、初期強度の発現に優れおり、コンクリート床版の補修材として最適なセメントモルタルを提供する。 The present invention solves the above problems, the rate of change in length is small, the static elastic modulus is suppressed to a certain range, the pot life is long, the initial strength is excellent, and the concrete slab Providing the most suitable cement mortar as a repair material.
本発明は、以下の構成によって上記課題を解決したセメントモルタルに関する。
〔１〕セメント１５〜３５質量％、速硬材１０〜３０質量％、細骨材４０〜７０質量％、添加材料１.０質量%以下、およびシリカフュームを含有し、シリカフューム(ＳＦ)の含有量が結合材(Ｂ)に対する質量比（ＳＦ／Ｂ）で２〜８％であり、水／結合材比３４％〜４４％において、長さ変化率が±２５０×１０−６であり、１５打フロー値２００mm以上であり、硬化始発時間３０分以上、および硬化終結時間７５分以下であることを特徴とする超速硬性セメントモルタル。
〔２〕材齢４時間圧縮強度が２８N/mm２以上であり、材齢２８日の静弾性係数が２６.５±５kN/mm２である上記[１]に記載する超速硬性セメントモルタル。
〔３〕軽量骨材を１０質量％以下含有することによって、軽量骨材を含有しないときの静弾性係数３１.５kN/mm２に対して３１.５kN/mm２未満〜２６.０kN/mm２以上になる割合で、材齢２８日の静弾性係数が低減されている上記[１]または上記[２]に記載する超速硬性セメントモルタル。
〔４〕再乳化粉末樹脂を含有するポリマーセメントモルタルであって、再乳化粉末樹脂を結合材の２質量％以下含有することによって、再乳化粉末樹脂を含有しないときの静弾性係数３１.５kN/mm２に対して３１.５kN/mm２未満〜２９.４kN/mm２以上になる割合で、材齢２８日の静弾性係数が低減されている上記[１]〜上記[３]の何れかに記載する超速硬性セメントモルタル。
〔５〕合成ポリマー系増粘・保水剤を０.１〜０.３質量％含有することによって、該増粘・保水剤を含有しないときの静弾性係数３１.５kN/mm２に対して３１.１〜３１.２kN/mm２になる割合で、材齢２８日の静弾性係数が低減されている上記[１]〜上記[３]の何れかに記載する超速硬性セメントモルタル。
〔６〕再乳化粉末樹脂を含有するポリマーセメントモルタルであって、再乳化粉末樹脂(Ｐ)の含有量が結合材(Ｂ)に対する質量比（Ｐ/Ｂ）２％以下において、凍結融解試験の３００サイクルの相対動弾性係数が８０％以上の凍結融解抵抗性を有する上記[１]〜上記[３]の何れかに記載する超速硬性セメントモルタル。
〔７〕合成ポリマー系増粘・保水剤を０.１〜０.３質量％含有することによって、凍結融解試験において３００サイクルの相対動弾性係数が８０％以上の凍結融解抵抗性を有する上記[１]〜上記[３]の何れかに記載する超速硬性セメントモルタル。
This invention relates to the cement mortar which solved the said subject with the following structures.
[1] 15 to 35% by mass of cement, 10 to 30% by mass of fast-hardening material, 40 to 70% by mass of fine aggregate, 1.0% by mass or less of additive material, and silica fume, and content of silica fume (SF) Is 2 to 8% by mass ratio (SF / B) to the binder (B), and when the water / binder ratio is 34% to 44%, the rate of change in length is ± 250 × 10 −6 and 15 strokes A super fast hardened cement mortar having a flow value of 200 mm or more, a curing start time of 30 minutes or more, and a curing end time of 75 minutes or less.
[2] age of 4 hours compressive strength is at 28N / mm 2 or more, ultrarapid hardening cement mortar static elastic modulus at the age of 28 days is described in [1] is a 26.5 ± 5kN / mm 2.
[3] By containing 10% by weight or less of lightweight aggregate, the static elastic modulus when not containing lightweight aggregate is 31.5 kN / mm 2 to less than 31.5 kN / mm 2 to 26.0 kN / mm 2 The super-fast-hardening cement mortar according to the above [1] or [2], wherein the static elastic modulus at a material age of 28 days is reduced at the above ratio.
[4] A polymer cement mortar containing a re-emulsified powder resin, and containing 2% by mass or less of the re-emulsified powder resin with a re-emulsified powder resin containing no re-emulsified powder resin 31.5 kN / in proportions with respect mm 2 becomes 31.5KN / mm 2 less than ～29.4KN / mm 2 or more, any of the above static elastic modulus at the age of 28 days is reduced [1] to [3] above The super fast-hardening cement mortar described in 1.
[5] By containing 0.1 to 0.3% by mass of the synthetic polymer-based thickening / water-retaining agent, the static elastic modulus when not containing the thickening / water-retaining agent is 31.5 kN / mm 2 The super fast-hardening cement mortar according to any one of [1] to [3] above, wherein the static elastic modulus is reduced at a material age of 28 days at a rate of 0.1 to 31.2 kN / mm 2 .
[6] A polymer cement mortar containing a re-emulsified powder resin, wherein the content of the re-emulsified powder resin (P) is less than 2% by mass ratio (P / B) to the binder (B). The super fast-hardening cement mortar according to any one of [1] to [3] above, which has a freeze-thaw resistance with a relative dynamic elastic modulus of 300 cycles of 80% or more.
[7] By containing 0.1 to 0.3% by mass of the synthetic polymer thickening / water-retaining agent, the freeze-thaw resistance has a relative dynamic elastic modulus of 300 cycles or more in a freeze-thaw test of 80% or more. [1] Ultra-high speed cement mortar described in any one of [3] above.
〔具体的な説明〕
本発明のセメントモルタルは、セメント１５〜３５質量％、速硬材１０〜３０質量％、細骨材４０〜７０質量％、添加材料１.０質量%以下、およびシリカフュームを含有し、シリカフューム(ＳＦ)の含有量が結合材(Ｂ)に対する質量比（ＳＦ／Ｂ）で２〜８％であり、水／結合材比３４％〜４４％において、長さ変化率が±２５０×１０−６であり、１５打フロー値２００mm以上であり、硬化始発時間３０分以上、および硬化終結時間７５分以下であることを特徴とする超速硬性セメントモルタルである。
[Specific description]
The cement mortar of the present invention contains 15 to 35% by mass of cement, 10 to 30% by mass of fast hard material, 40 to 70% by mass of fine aggregate, 1.0% by mass or less of additive material, and silica fume. ) Is 2 to 8% by mass ratio (SF / B) to the binder (B), and the length change rate is ± 250 × 10 −6 at a water / binder ratio of 34% to 44%. Yes, it is a super fast setting cement mortar characterized by having a 15-shot flow value of 200 mm or more, a hardening start time of 30 minutes or more, and a hardening end time of 75 minutes or less.
本発明のセメントモルタルには、普通ポルトランドセメント、早強ポルトランドセメント、低熱ポルトランドセメント、高炉セメント、フライアッシュセメント、中庸熱セメント、またはシリカセメントなどを使用することができ。セメントの含有量は１５〜３５質量％が好ましい。該セメント量が１５質量％未満では材齢２８日の長期圧縮強度が不足し、一方、３５質量％を上回ると長さ変化率が大きくなるので好ましくない。 As the cement mortar of the present invention, ordinary Portland cement, early-strength Portland cement, low heat Portland cement, blast furnace cement, fly ash cement, medium heat heat cement, or silica cement can be used. The cement content is preferably 15 to 35% by mass. If the amount of cement is less than 15% by mass, the long-term compressive strength at 28 days of age is insufficient. On the other hand, if it exceeds 35% by mass, the rate of change in length increases, such being undesirable.
本発明のセメントモルタルには速硬材が含有されている。速硬材としては、無水石膏とＣ１２Ａ７クリンカー粉砕物の混合物、あるいは無水石膏とアルミナセメントの混合物などが用いられる。速硬材の含有量は１０〜３０質量％が好ましい。速硬材の含有量が上記範囲より少ないと材齢２時間、材齢４時間の初期圧縮強度が低くなり、上記範囲より多いと硬化時間が短くなりすぎ、硬化始発時間３０分以上が得られなくなるので好ましくない。 The cement mortar of the present invention contains a quick hardening material. As the quick-hardening material, a mixture of anhydrous gypsum and C 12 A 7 clinker, a mixture of anhydrous gypsum and alumina cement, or the like is used. As for content of a quick-hardening material, 10-30 mass% is preferable. If the content of the quick-hardening material is less than the above range, the initial compressive strength at a material age of 2 hours and a material age of 4 hours becomes low. Since it disappears, it is not preferable.
本発明のセメントモルタルに含まれる細骨材量は４０〜７０質量％が好ましい。細骨材量が上記範囲より少ないと長さ変化率が大きくなり、上記範囲より多いと初期材齢の圧縮強度が低くなるので好ましくない。細骨材は絶乾密度が２.５〜３.０ｇ/cm３の珪砂、石灰石砕砂、硬質砂岩砕砂、山砂、川砂などが好ましい。 The amount of fine aggregate contained in the cement mortar of the present invention is preferably 40 to 70% by mass. If the amount of fine aggregate is less than the above range, the rate of change in length increases, and if it exceeds the above range, the compressive strength at the initial age is lowered, which is not preferable. The fine aggregate is preferably quartz sand, limestone crushed sand, hard sandstone crushed sand, mountain sand, river sand or the like having an absolute dry density of 2.5 to 3.0 g / cm 3 .
本発明のセメントモルタルはシリカフューム(ＳＦ)を含有する。シリカフュームの含有量は結合材量に対する質量比(ＳＦ／Ｂ)で２〜８％になる範囲が好ましい。結合材(Ｂ)はセメントと速硬材であり、結合材量はその合計量である。ＳＦ／Ｂ比が２〜８％の範囲であることによって、水／結合材比３４％〜４４％において、モルタルの長さ変化率が±２５０×１０−６に抑制されている。ＳＦ／Ｂ比が２未満では、モルタルの長さ変化率を上記範囲に抑制するのが難しい。なお、長さ変化率はＮＥＸＣＯ試験方法（第４編 構造関係試験方法）試験法４３９「床版上面における断面修復用補修材の試験方法」に定められている方法に準拠し、寸法が１００×１００×４００ｍｍの試験体を用いて、材齢２時間で基長を測定し、材齢６時間〜２８日のモルタルについて測定した値である。 The cement mortar of the present invention contains silica fume (SF). The content of silica fume is preferably in the range of 2 to 8% by mass ratio (SF / B) to the amount of binder. The binding material (B) is cement and a quick-hardening material, and the amount of the binding material is the total amount thereof. When the SF / B ratio is in the range of 2 to 8%, the mortar length change rate is suppressed to ± 250 × 10 −6 in the water / binder ratio of 34% to 44%. If the SF / B ratio is less than 2, it is difficult to suppress the mortar length change rate within the above range. Note that the rate of change in length is in accordance with the method defined in the NEXCO test method (Part 4 structure-related test method) test method 439 “Test method for repair material for cross-sectional repair on the upper surface of floor slab”, and the dimension is 100 ×. It is a value measured for a mortar from 6 hours to 28 days of age by measuring the base length at a material age of 2 hours using a 100 × 400 mm test specimen.
一方、ＳＦ／Ｂ比が８を超えると流動性が低下する。具体的には、ＳＦ／Ｂ比が８を超えると、水／結合材比３４％〜４４％において、混練直後の１５打フロー値が２００mm未満に低減する傾向があるので好ましくない。 On the other hand, if the SF / B ratio exceeds 8, the fluidity decreases. Specifically, an SF / B ratio exceeding 8 is not preferable because the 15-stroke flow value immediately after kneading tends to be reduced to less than 200 mm at a water / binder ratio of 34% to 44%.
本発明のセメントモルタルの水／結合材比は３４％〜４４％が好ましい。水／結合材比が上記範囲より小さいと流動性が低下し、所望のフロー値を得るのが難しい。水／結合材比が上記範囲より大きいと長さ変化率が大きくなるので好ましくない。 The water / binder ratio of the cement mortar of the present invention is preferably 34% to 44%. When the water / binder ratio is smaller than the above range, the fluidity is lowered and it is difficult to obtain a desired flow value. If the water / binder ratio is larger than the above range, the rate of change in length increases, which is not preferable.
本発明のセメントモルタルは、硬化開始までの始発時間が３０分以上であり、可使時間が長い。一方、硬化終結時間は７５分以下であり超速硬性を有する。さらに、材齢４時間圧縮強度は２８N/mm２以上であり、初期強度が高い。また、材齢２８日の静弾性係数は２６.５±５kN/mm２であり静弾性係数が所要の範囲内である。 The cement mortar of the present invention has an initial time of 30 minutes or more until the start of curing, and has a long pot life. On the other hand, the curing end time is 75 minutes or less, and it has super fast hardness. Furthermore, the compressive strength at the age of 4 hours is 28 N / mm 2 or more, and the initial strength is high. Further, the static elastic modulus at the age of 28 days is 26.5 ± 5 kN / mm 2 , and the static elastic modulus is within the required range.
本発明のセメントモルタルは、添加材料を１.０質量％以下含有することができる。添加材料は炭酸ナトリウムやアルミン酸ナトリウム等の刺激剤、消包剤、繊維、凝結促進剤などである。添加材料の含有量は合計量で１.０質量％以下が好ましい。 The cement mortar of the present invention can contain 1.0% by mass or less of an additive material. Additive materials include stimulants such as sodium carbonate and sodium aluminate, anti-packaging agents, fibers, and setting accelerators. The total content of additive materials is preferably 1.0% by mass or less.
本発明のセメントモルタルは軽量骨材を含有することができる。軽量骨材は絶乾密度１.８ｇ/cm３以下が好ましく、天然軽量骨材または人工軽量骨材の何れでも良い。軽量骨材を含有することによって材齢２８日の静弾性係数を小さくすることができる。軽量骨材量に比例して静弾性係数が低下する傾向があり、例えば、軽量骨材を１０質量％以下含有することによって、材齢２８日の静弾性係数が、軽量骨材を含有しないときの静弾性係数３１.５kN/mm２に対して３１.５kN/mm２未満〜２６.０kN/mm２以上になる割合で低減される。なお、材齢２８日の静弾性係数を単に静弾性係数と云う場合がある。 The cement mortar of the present invention can contain a lightweight aggregate. The lightweight aggregate preferably has an absolute dry density of 1.8 g / cm 3 or less, and may be either a natural lightweight aggregate or an artificial lightweight aggregate. By containing a lightweight aggregate, the static elastic modulus of 28 days of age can be reduced. When the static elastic modulus tends to decrease in proportion to the amount of light aggregate, for example, when the light elastic aggregate contains 10% by mass or less, the static elastic modulus at age 28 days does not contain light aggregate is reduced so that the ratio of relative static modulus 31.5kN / mm 2 to 31.5kN / mm 2 less than ~26.0kN / mm 2 or more. In addition, the static elastic modulus at the age of 28 days may be simply referred to as a static elastic modulus.
軽量骨材の含有量は１０質量％以下が好ましい。軽量骨材の含有量が多くなると材齢４時間の初期圧縮強度が低下する傾向があり、軽量骨材量が１０質量％を超えると、材齢４時間の初期圧縮強度が２８N/mm２より小さくなるので好ましくない。 The content of the lightweight aggregate is preferably 10% by mass or less. When the content of lightweight aggregate increases, the initial compressive strength at 4 hours of age tends to decrease. When the amount of lightweight aggregate exceeds 10% by mass, the initial compressive strength at 4 hours of age is from 28 N / mm 2 . Since it becomes small, it is not preferable.
本発明のセメントモルタルは、再乳化粉末樹脂を含有するポリマーセメントモルタルにすることによって、静弾性係数を小さくすることができる。再乳化粉末樹脂量に比例して静弾性係数が低下する傾向があり、例えば、再乳化粉末樹脂(Ｐ)を結合材(Ｂ)に対して２質量％以下（Ｐ／Ｂ比２質量％以下）含有することによって、材齢２８日の静弾性係数が、再乳化粉末樹脂を含有しないときの静弾性係数３１.５kN/mm２に対して３１.５kN/mm２未満〜２９.４kN/mm２以上になる割合で低減される。 By making the cement mortar of the present invention a polymer cement mortar containing a re-emulsified powder resin, the static elastic modulus can be reduced. The static elastic modulus tends to decrease in proportion to the amount of the re-emulsified powder resin. For example, the re-emulsified powder resin (P) is 2% by mass or less (P / B ratio is 2% by mass or less) with respect to the binder (B). ) by containing the static modulus of elasticity of the age of 28 days, redispersible powder static modulus of elasticity when the resin containing no 31.5kN / mm 2 with respect to 31.5kN / mm 2 less than ~29.4kN / mm Reduced at a rate of 2 or more.
再乳化粉末樹脂量は２質量％以下が好ましい。再乳化粉末樹脂量に比例して長さ変化率が大きくなる傾向があり、再乳化粉末樹脂量がＰ／Ｂ比２質量％を超えると、長さ変化率が＋２５０×１０−６以上になるので好ましくない。 The amount of the re-emulsified powder resin is preferably 2% by mass or less. The length change rate tends to increase in proportion to the amount of the re-emulsified powder resin. When the amount of the re-emulsified powder resin exceeds 2% by mass, the length change rate becomes + 250 × 10 −6 or more. Therefore, it is not preferable.
また、本発明のセメントモルタルは、再乳化粉末樹脂を含有するポリマーセメントモルタルにすることによって、凍結融解抵抗性を高めることができる。具体的には、例えば、再乳化粉末樹脂(Ｐ)の含有量が結合材(Ｂ)に対する質量比（Ｐ/Ｂ）２％以下において、凍結融解試験の３００サイクルの相対動弾性係数が８０％以上の凍結融解抵抗性を有することができる。 Moreover, the cement mortar of this invention can improve freeze-thaw resistance by using the polymer cement mortar containing re-emulsified powder resin. Specifically, for example, when the content of the re-emulsified powder resin (P) is 2% or less of the mass ratio (P / B) to the binder (B), the relative dynamic elastic modulus of 300 cycles of the freeze-thaw test is 80%. It can have the above freeze-thaw resistance.
本発明のセメントモルタルは、再乳化粉末樹脂に代えて、合成ポリマー系増粘・保水剤を含有することによって静弾性係数を小さくすることができる。該増粘・保水剤の含有量は０.１〜０.３質量％が好ましい。該増粘・保水剤を０.１〜０.３質量％含有することによって、材齢２８日の静弾性係数が、該増粘・保水剤を含有しないときの静弾性係数３１.５kN/mm２に対して３１.１〜３１.２kN/mm２になる割合で低減される。 The cement mortar of the present invention can reduce the static elastic modulus by containing a synthetic polymer thickener / water retention agent instead of the re-emulsified powder resin. The content of the thickening / water retention agent is preferably 0.1 to 0.3% by mass. By containing 0.1 to 0.3% by mass of the thickening / water-retaining agent, the static elastic modulus at the age of 28 days is 31.5 kN / mm when the thickening / water-retaining agent is not contained. 2 is reduced at a rate of 31.1 to 31.2 kN / mm 2 .
本発明のセメントモルタルは、長さ変化率が±２５０×１０−６の範囲であるので、空隙の充填材として大量に使用しても、固化後に充填箇所の境界に隙間が生じることが殆どない。また、静弾性係数が２１.５〜３１.５kN/mm２の範囲であるので、コンクリート床版との静弾性係数の差を小さくすることができ、コンクリート床版の補修材として使用したときに、交通開放後に繰返し荷重が加わっても既設コンクリート床版の補修部分から再劣化することが少ない。さらに、本発明のセメントモルタルは、混練直後の１５打フロー値が２００mm以上であり流動性が高く、硬化始発時間（可使時間）が３０分以上であるので施工性が良い。また、材齢４時間の初期圧縮強度が２８N/mm２以上であり、初期強度の発現性が良い。 Since the cement mortar of the present invention has a length change rate in the range of ± 250 × 10 −6 , even if it is used in a large amount as a filler for voids, there is almost no gap at the boundary of the filling site after solidification. . Moreover, since the static elastic modulus is in the range of 21.5 to 31.5 kN / mm 2 , the difference in static elastic modulus with the concrete slab can be reduced, and when used as a repair material for concrete slab. Even if a repeated load is applied after traffic is released, it is unlikely to deteriorate again from the repaired portion of the existing concrete slab. Furthermore, the cement mortar of the present invention has a good workability because the 15-shot flow value immediately after kneading is 200 mm or more, the fluidity is high, and the initial curing time (potential time) is 30 minutes or more. Further, the initial compressive strength at a material age of 4 hours is 28 N / mm 2 or more, and the initial strength is well expressed.
本発明のセメントモルタルは再乳化粉末樹脂を含有するポリマーセメントモルタルにすることによって、静弾性係数がさらに小さく、凍結融解抵抗性の高いモルタルを得ることができる。 By making the cement mortar of the present invention into a polymer cement mortar containing a re-emulsified powder resin, it is possible to obtain a mortar having a smaller static elastic modulus and high resistance to freezing and thawing.
以下、本発明を実施例および比較例によって具体的に示す。
１５打フロー値はＪＩＳ Ｒ ５２０１「セメントの物理試験方法」に従って測定した。硬化時間はJIS A 1147（2007年）に従って測定し、硬化始発時間を可使時間とした。材齢２時間と材齢４時間の初期圧縮強度はJIS A 1108（2006年）に従って測定した。静弾性係数はJIS A 1149（2010年）に従い、気中養生、材齢２８日ついて測定した。長さ変化率は、ＮＥＸＣＯ試験方法（第４編 構造関係試験方法）試験法４３９「床版上面における断面修復用補修材の試験方法」に従い、気中養生(湿度６０±１０％)を行い、材齢１１０分で脱型し、材齢２時間で基長を測定し、材齢６時間、１、３、７、２８日の長さ変化率を測定した。長さ変化率(×１０−６)は、Ｘ＝(Lm−L0)/L0、Lmは材齢m(時間、日)における供試体の長さ(mm)、L0は基長：材齢2時間における供試体の長さ(mm)である。供試体は１００×１００×４００mmとした。
使用材料を表１に示す。
Hereinafter, the present invention will be specifically described by Examples and Comparative Examples.
The 15-stroke flow value was measured according to JIS R 5201 “Cement physical test method”. The curing time was measured according to JIS A 1147 (2007), and the initial curing time was taken as the pot life. The initial compressive strength at a material age of 2 hours and a material age of 4 hours was measured according to JIS A 1108 (2006). The static elastic modulus was measured according to JIS A 1149 (2010) for air curing and age 28 days. The rate of change in length was determined by performing air curing (humidity 60 ± 10%) in accordance with the NEXCO test method (Part 4 structure-related test method) test method 439 “Test method for repair material for cross-sectional repair on the top of floor slab” The mold was removed at 110 minutes, the base length was measured at 2 hours, and the rate of change in length at 6 hours, 1, 3, 7, and 28 days was measured. The rate of change in length (× 10 −6 ) is X = (L m −L 0 ) / L 0 , L m is the length (mm) of the specimen at the age m (hour, day), and L 0 is the base Length: The length (mm) of the specimen at the age of 2 hours. The specimen was 100 × 100 × 400 mm.
The materials used are shown in Table 1.
〔実施例１〕
表１の材料を使用し、表２に示す材料組成に従ってセメントモルタルを製造した。水結合材比(Ｗ／Ｂ)は３９.０％(水粉体比１６.０％)とした。練混ぜには、ホバートミキサを用いた。容器に粉体と練混ぜ水を入れ、１分間低速で練混ぜ、き落し後に高速で２分間練り混ぜた。結果を表３に示した。
ＳＦ/Ｂを２.０％以上にすることによって長さ変化率が±２５０×１０−６の範囲内になる。一方、ＳＦ/Ｂが８.０％を上回ると１５打フローが２００mm以下になり、流動性が低下して施工性が劣るようになる。また、本発明の試料Ａ１〜Ａ４は硬化始発時間が３０分以上であり、硬化終結時間が６５分以下である。初期圧縮強度（２時間、４時間）、材齢２８日の静弾性係数は何れも基準値を満足する。
[Example 1]
Cement mortar was manufactured according to the material composition shown in Table 2 using the materials shown in Table 1. The water binder ratio (W / B) was 39.0% (water powder ratio 16.0%). A Hobart mixer was used for mixing. The container was mixed with powder and water for mixing for 1 minute at low speed, and after scraping, it was mixed for 2 minutes at high speed. The results are shown in Table 3.
By setting SF / B to 2.0% or more, the length change rate falls within the range of ± 250 × 10 −6 . On the other hand, if SF / B exceeds 8.0%, the 15-stroke flow becomes 200 mm or less, the fluidity is lowered, and the workability is inferior. Samples A1 to A4 of the present invention have a curing start time of 30 minutes or longer and a curing end time of 65 minutes or shorter. The initial compressive strength (2 hours, 4 hours) and the static elastic modulus at the age of 28 days all satisfy the standard values.
〔実施例２〕
表２の試料Ａ３の材料組成において、水結合材比(Ｗ/Ｂ)を変えてモルタルを製造した。この結果を表４に示す。水結合材比(Ｗ/Ｂ)が３４.０〜４４.０％の範囲で何れも基準値を満足している。水結合材比(Ｗ/Ｂ)が４４.０％より大きいと（試料Ｂ３）、４時間圧縮強度が基準値を充たさなくなる。また、水結合材比(Ｗ/Ｂ)が３４.０％より小さいと（試料Ｂ４）、１５打フローが低下して施工性が悪化し、静弾性係数が基準値を超過するようになる。
[Example 2]
Mortars were produced by changing the water binder ratio (W / B) in the material composition of Sample A3 in Table 2. The results are shown in Table 4. The water binder ratio (W / B) satisfies the standard value in the range of 34.0 to 44.0%. If the water binder ratio (W / B) is greater than 44.0% (Sample B3), the 4-hour compressive strength will not meet the standard value. If the water binder ratio (W / B) is less than 34.0% (sample B4), the 15-stroke flow is reduced, workability is deteriorated, and the static elastic modulus exceeds the reference value.
〔実施例３〕
表１の材料を使用し、表５に示す材料組成に従い、軽量骨材の添加量を０質量％〜１５質量％の範囲で変えてセメントモルタルを製造した。水結合材比(Ｗ/Ｂ)は３４.０％(水粉体比１４.０％)とした。この結果を表６に示す。軽量骨材の添加量の増加に比例して静弾性係数(材齢２８日)が小さくなる傾向がある。一方、軽量骨材の添加量が１０質量％を超えると、４時間圧縮強度が基準値より低下するので好ましくない。
Example 3
Cement mortar was manufactured using the materials shown in Table 1 and changing the amount of lightweight aggregate in the range of 0 to 15% by mass in accordance with the material composition shown in Table 5. The water binder ratio (W / B) was 34.0% (water powder ratio 14.0%). The results are shown in Table 6. The static elastic modulus (age 28 days) tends to decrease in proportion to the increase in the amount of lightweight aggregate added. On the other hand, if the amount of light aggregate added exceeds 10% by mass, the compressive strength for 4 hours is lower than the standard value, which is not preferable.
〔実施例４〕
表１の材料を使用し、表７に示す材料組成に従い、再乳化粉末樹脂(Ｐ)の添加量を０質量％〜１.６０質量％の範囲（Ｐ/Ｂ比は０、１、２、４％）で変えてポリマーセメントモルタルを製造した。水結合材比(Ｗ/Ｂ)は３４.０％(水粉体比１４.０％)とした。この結果を表８に示す。Ｐ/Ｂ比の増加に比例して、長さ変化率が大きくなり、Ｐ/Ｂ比が２％以下のときに長さ変化率が±２５０×１０−６の基準値内となった。また、Ｐ/Ｂ比の増加に比例して静弾性係数が小さくなり、材齢２８日の静弾性係数が、再乳化粉末樹脂を含有しないときの静弾性係数３１.５kN/mm２に対して３１.５〜２９.４kN/mm２に低減されている。なお、Ｐ/Ｂ比が０％では基準値の上限であった。
また、再乳化粉末樹脂に代えて、合成ポリマー系増粘・保水剤を０.１〜０.３質量％含有することによって、該増粘・保水剤を含有しないときの静弾性係数３１.５kN/mm２に対して３１.１〜３１.２kN/mm２に低減されている。
Example 4
Using the materials shown in Table 1, the re-emulsified powder resin (P) was added in the range of 0% by mass to 1.60% by mass in accordance with the material composition shown in Table 7 (P / B ratio was 0, 1, 2, 4%) to produce a polymer cement mortar. The water binder ratio (W / B) was 34.0% (water powder ratio 14.0%). The results are shown in Table 8. In proportion to the increase in the P / B ratio, the length change rate increased. When the P / B ratio was 2% or less, the length change rate was within the reference value of ± 250 × 10 −6 . In addition, the static elastic modulus decreases in proportion to the increase in the P / B ratio, and the static elastic modulus of 28 days of age is 31.5 kN / mm 2 when no re-emulsified powder resin is contained. It is reduced to 31.5 to 29.4 kN / mm 2 . Note that the upper limit of the reference value was obtained when the P / B ratio was 0%.
Further, by replacing the re-emulsified powder resin with 0.1 to 0.3% by mass of the synthetic polymer thickening / water retention agent, the static elastic modulus when not containing the thickening / water retention agent is 31.5 kN. It is reduced with respect / mm 2 to 31.1～31.2KN / mm 2.
〔実施例５：凍結融解試験〕
試料Ａ１３〜Ａ１７について、凍結融解試験を行った。試験方法は、ＪＩＳ Ａ １１４８ 「コンクリートの凍結融解試験方法」に準拠して３００サイクルまで行い、相対動弾性係数を測定し、８０％以上を合格とした。この結果を図１に示した。
図示するように、再乳化粉末樹脂をＰ/Ｂ質量比１％含有する試料Ａ１４、Ｐ/Ｂ質量比２％含有する試料Ａ１５、合成ポリマー系増粘・保水剤を０.１質量％含有する試料Ａ１６、０.３質量％含有する試料Ａ１７は、何れも凍結融解抵抗性が格段に向上し、３００サイクル凍結融解の繰返し後も相対動弾性係数８０％以上を維持した。
[Example 5: Freeze-thaw test]
Samples A13 to A17 were subjected to a freeze / thaw test. The test method was conducted up to 300 cycles in accordance with JIS A 1148 “Concrete Freeze-Thaw Test Method”, the relative dynamic elastic modulus was measured, and 80% or more was accepted. The results are shown in FIG.
As shown in the figure, sample A14 containing 1% P / B mass ratio of re-emulsified powder resin, sample A15 containing 2% P / B mass ratio, and 0.1% by mass of synthetic polymer thickener / water retention agent. Both sample A16 and sample A17 containing 0.3% by mass showed markedly improved freeze-thaw resistance, and maintained a relative kinematic modulus of 80% or more even after 300 cycles of freeze-thaw cycles.
〔実施例６〕
表１の材料を使用し、表９に示す材料組成に従い、セメント量、速硬材量、細骨材量範囲で変えてセメントモルタルを製造した。水結合材比(Ｗ/Ｂ)は３９.０％(水粉体比１６.０％)とした。この結果を表１０に示す。この結果に示すように、セメント１５〜３５質量％、速硬材１０〜３０質量％、細骨材４０〜７０質量％、および添加材料１.０質量%以下の組成において、シリカフューム量および軽量骨材量を本発明の範囲にすることによって、フロー値、硬化始発時間、初期強度、静弾性係数、長さ変化率の何れも基準値を満足している。
Example 6
Cement mortar was manufactured by using the materials shown in Table 1 and changing the amount of cement, the amount of fast-hardening material, and the amount of fine aggregate according to the material composition shown in Table 9. The water binder ratio (W / B) was 39.0% (water powder ratio 16.0%). The results are shown in Table 10. As shown in this result, the amount of silica fume and the lightweight bone in the composition of 15 to 35% by mass of cement, 10 to 30% by mass of fast hard material, 40 to 70% by mass of fine aggregate, and 1.0% by mass or less of additive material. By setting the amount of material within the range of the present invention, the flow value, the initial curing time, the initial strength, the static elastic modulus, and the rate of change in length all satisfy the reference values.
Claims (7)
15 to 35% by mass of cement, 10 to 30% by mass of fast-hardening material, 40 to 70% by mass of fine aggregate, 1.0% by mass or less of additive material, and silica fume, and the content of silica fume (SF) is a binder. The mass ratio (SF / B) to (B) is 2 to 8%, the length change rate is ± 250 × 10 −6 at a water / binder ratio of 34% to 44%, and a 15 stroke flow value of 200 mm. An ultrafast hardened cement mortar having a curing start time of 30 minutes or more and a curing end time of 75 minutes or less.
Age of 4 hours compressive strength is at 28N / mm 2 or more, ultrarapid hardening cement mortar according to claim 1 static modulus at the age of 28 days is 26.5 ± 5kN / mm 2.
By containing 10% by weight or less of lightweight aggregate, the static elastic modulus when not containing lightweight aggregate is 31.5 kN / mm 2 and less than 31.5 kN / mm 2 to 26.0 kN / mm 2 or more. The super fast-hardening cement mortar according to claim 1 or 2, wherein the static elastic modulus of the material age of 28 days is reduced in proportion.
A polymer cement mortar containing a re-emulsified powder resin, wherein the re-emulsified powder resin is contained in an amount of 2% by mass or less of the binder, so that the static elastic modulus is 31.5 kN / mm 2 when the re-emulsified powder resin is not contained. The super fast hardness according to any one of claims 1 to 3, wherein the static elastic modulus of the material is 28 days old at a ratio of less than 31.5 kN / mm 2 to 29.4 kN / mm 2 or more. Cement mortar.
By containing 0.1 to 0.3% by mass of the synthetic polymer thickening / water retention agent, 31.1 to 31.5 kN / mm 2 of the static elastic modulus when the thickening / water retention agent is not contained. ratio to form the 31.2kN / mm 2, ultrarapid hardening cement mortar according to any one of claims 1 to 3, the static modulus of elasticity of the age of 28 days is reduced.
A polymer cement mortar containing a re-emulsified powder resin, wherein the content of the re-emulsified powder resin (P) is less than 2% by mass (P / B) with respect to the binder (B) and 300 cycles of the freeze-thaw test The super fast-hardening cement mortar according to any one of claims 1 to 3, which has a freeze-thaw resistance having a relative dynamic elastic modulus of 80% or more.
Claims 1 to Claims having a relative dynamic elastic modulus of 300 cycles or more in a freeze-thaw test of 80% or more in a freeze-thaw test by containing 0.1 to 0.3% by mass of a synthetic polymer thickener / water retention agent. Item 4. The super fast-hardening cement mortar according to any one of Items 3 to 4.
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