Fig. 1 Skid pavement. Fig. 2 Top-coat for drainage asphalt pavement. 38 DIC Technical Review No.11 / 2005

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1 Technical Trend of High Performance Road Pavement by Synthetic Resins NONAKA Shinichi Resent years, Japanese road policy is changing from the building of new expressways and national roads to the improvement of structure for safe, environment-friendly and human-friendly. The environmental-friendly road surfaces are most important topics. For example, drainage asphalt pavement is used to allow water to drain quickly from the road surface, and to reduce traffic noise. Especially, topics on which it concentrates are development of innovative technologies that help the environment is being advanced, such as road surfaces to ease the "heat islands phenomenon," and porous pavement that allows rainwater to drain to the ground under structure. In a word, to pave high performance road surfaces, high performance resins such as coating resin which is used for a heat-shielding pavement are neccesary. This paper describes the approach of the road pavement that uses such synthetic resins to bring high performance. 1 2 DIC Technical Review No.11 /

2 Fig. 1 Skid pavement. Fig. 2 Top-coat for drainage asphalt pavement. 38 DIC Technical Review No.11 / 2005

3 総 説 与する 不飽和ポリエステル樹脂に用いられるスチ シャーレに均一に固結させ アスファルト表面積 レンはアスファルト溶解性が極めて高いのに比較し S1 アスファルト重量 W1 を秤量し試験に供す てMMAは溶解性が低いことから アスファルト舗装 る 供試アスファルトおよび評価樹脂を任意温度に を溶解させて強度を低下させる カットバック 危 調整し 樹脂5 gを秤量してアスファルト上に乗せ 険性は少ないものの 長時間の接触によっては同様 分静置後 樹脂および軟化アスファ にカットバックする傾向がある 以下にMMAの樹脂 ルトをスパチュラで除き さらにメタノール アセ 中における濃度 温度におけるアスファルト溶解性 を樹脂接触時間との関連で示す アスファルト溶解性試験方法は以下の通りである 測定方法 φ56 mm 深さ 6 mmのシャーレにスト トン1 1混合液で表面を洗浄後重量を測定し溶解量 W2 を測定 溶解率 % W2 W1 100 溶解速度 g / cm2 min. W2 S1 接触時間(min.)) レートアスファルト 約 5 gを80 に加熱し Fig. 3から不揮発分濃度 NV が高くなるほど溶解 率は低く 接触時間が長くても変動が少なくなる傾 向にあることがわかる また Fig. 4および5では温度 が高くなるほど著しく溶解率および溶解速度が上昇 することがわかる 実際のアスファルト舗装にMMA 樹脂を塗布する場合 冬季は約0 夏季昼間は60 を超える表面温度となることから 樹脂設計上 不 揮発分濃度 NV は極めて重要な因子となる Fig. 6 はストレートアスファルトのMMA樹脂中での状態を Fig. 3 Relationship of non-volatile content in MMA-resin and contact time on asphalt dissolution rate. 示したもので NV60%超では静置状態での明確な溶 解は目視で確認できないが 45%では静置状態でも著 Fig. 4 Relationship of non-volatile content in MMA-resin and temperature on asphalt dissolution rate. Fig. 6 Asphalt dissolution situation. Fig. 5 Relationship of non-volatile content in MMA-resin and temperature on asphalt dissolution speed. Fig. 7 Asphalt cutting back during curring. DIC Technical Review No.11 /

4 Fig. 8 Radical polymerization obstructing reaction with oxygen. Fig. 10 Functional groups that controls polymerization obstruction reaction with oxygen. Fig. 9 Dehydrogenation reaction that controls polymerization obstruction with oxygen. Fig. 11 Method of introducing functional groups. 40 DIC Technical Review No.11 / 2005

5 Table 1 Table 2 Table 3 MMA-type Resin Table 4 Copolymerization of Various Polymerized Functional Groups (r1, r2) DIC Technical Review No.11 /

6 Table 5 Fig. 12 Relation between double bond density in oligomer and physical properties Fig. 13 Relation between double bond density in oligomer and amount of extraction with chloroform DIC Technical Review No.11 / 2005

7 総 説 Fig. 15 Dip up the rate. Fig. 14 Property of skid pavement with top-coat. *Test pavement boad Concrete pavement boad Resin 1:HTP-506W 1.5 kg/m2 Natural stone : 6.5 kg/m2 Top-coat : 0.4 kg/m2 *Examination After 24 hr.:urethane solid tire(jis=87) area set up 9.8 cm2, load 70 kg 7.14 kg/cm2 inside diameter 15 cm Decrease in weight after 50 cycles and 100 cycles Fig. 16 Change of coefficient of water penetration by traverse examination. ①バインダとしてのアスファルトの劣化が早くライ フサイクルが短い ②空隙の目詰まりによって排水機能および騒音低減 機能が低下し機能維持が困難 ③凍結防止剤を表面に保持することが困難 ④建設コストが上昇 これらに対して高粘度改質アスファルトが開発 改良され さらに空隙のつぶれや寒冷地における摩 耗および骨材の飛散を抑制する方法として熱硬化性 樹脂を表面に塗布し樹脂皮膜を作る排水性トップコ ート工法が開発された14) 排水性トップコートによる施工現場における耐骨 材飛散性15)や透水性試験による空隙詰まり抑制効果16) が報告されている 以下に排水性トップコートとしての基本特性とし てのアスファルト補強効果について述べる ①ホイールトラッキング試験 Fig. 17 Amount of accumulation subsidence. *examination tire : solid tire (JIS hardness 78/60 ) load : 70 kgf inside diameter : 9.5 cm rate : 10.5 cm/sec temperature : 45 cycles : 1800 (until 180 min. or destruction) 高粘度バインダー 改質アスファルト 6号砕石 を用い 目標空隙率25%に設計したベースアスコンに 排水性トップコート樹脂を0.7 kg/m2 エメリー 骨材 を0.3 kg/m2散布した試片について試験を行い 轍掘れ DIC Technical Review No.11 /

8 DIC Technical Review No.11 / 2005

9 NONAKA Shinichi DIC Technical Review No.11 /

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