傳統等黏度法主要依據瀝青膠結料之黏度－溫度關係判定拌合溫度，但不同溫拌添加劑之作用機制並不相同，其工作性改善效果未必能由黏度變化完整反映。本研究以不同拌合溫度評估方法之比較為核心，選用化學型溫拌添加劑 WMA-C 與有機型溫拌添加劑 WMA-W，分別由黏度、摩擦特性、骨材包覆、拌合阻力及壓實工作性等不同層級，探討各方法對溫拌瀝青降溫效果之判定差異。
瀝青膠結料於 105、135 及 165°C 下進行旋轉黏度與 Ball-on-Three-Plates（BO3P）摩擦學試驗，並選取滑移速度 0.30 m/s 所對應之摩擦係數 {\mu }_{0.3}作為代表性摩擦參數。混合料工作性則以行星式攪拌器輸入功率換算等效拌合扭矩，並配合粗骨材包覆率、NCHRP IDEA246 提供{\boldsymbol{N}}_{92}壓實圈數預測公式配合施工經驗值及預測等效拌合扭矩方法，比較不同方式所得之建議拌合溫度。
結果顯示，各方法所得降溫幅度具有明顯差異。傳統黏度法所得 WMA-C 與 WMA-W 降溫幅度分別約為 1–8°C 與 2–11°C，整體較為保守；實際等效拌合扭矩法則分別約為 6–28°C 與 12–32°C。所有溫拌混合料於 128°C 時之粗骨材包覆率均高於 96.5%，符合 95% 最低要求。利用N_{92}預測公式配合施工經驗值推估，WMA-C 與 WMA-W 之降溫幅度分別約為 23–32°C 與 13–33°C；以等 AC-20 摩擦係數{\mu }_{0.3}判定所得降溫幅度則分別約為 12–29°C 與 24–31°C，於中、高劑量下與實際拌合工作性呈現較一致之趨勢。預測等效拌合扭矩法所得降溫幅度分別約為1–17°C與2–20°C，雖能反映添加劑劑量效應，但整體較實測扭矩結果保守。
綜合而言，各方法所得溫度差異主要與其所反映之工作性機制不同有關。黏度法主要表徵膠結料流動性，摩擦學反映界面潤滑能力，等效拌合扭矩可直接量化混合料拌合阻力，而包覆率與 N_{92}則分別反映最低包覆能力及壓實工作性。因此，溫拌瀝青拌合溫度宜結合不同層級之工作性指標進行綜合評估，而不宜僅依單一指標判定。

The conventional equiviscous method determines asphalt mixing temperature from the binder viscosity–temperature relationship, but the workability effects of warm-mix asphalt (WMA) additives may not be fully reflected by viscosity alone. This study compared mixing-temperature evaluation methods for a chemical additive (WMA-C) and an organic additive (WMA-W) using binder viscosity, tribological behavior, aggregate coating, mixing resistance, and compaction workability.
Rotational viscosity and Ball-on-Three-Plates (BO3P) tribological tests were conducted at 105, 135, and 165°C. The friction coefficient at a sliding speed of 0.30 m/s (μ0.3) was selected as the representative tribological parameter. Mixture workability was evaluated using equivalent mixing torque converted from planetary-mixer input power, coarse-aggregate coating, the Superpave gyratory-compaction parameter N_{92}, and a predicted equivalent-torque method.
The results showed substantial differences among methods. The viscosity method estimated temperature reductions of 1–8°C for WMA-C and 2–11°C for WMA-W. Measured equivalent torque yielded larger reductions of 6–28°C and 12–32°C, respectively. All WMA mixtures maintained aggregate coating above 96.5% at 128°C. The N92-based method estimated reductions of 23–32°C for WMA-C and 13–33°C for WMA-W, while the {mu }_{0.3}-based method estimated 12–29°C and 24–31°C. The tribological results generally followed the measured mixing-resistance trends at medium and high additive dosages. The predicted equivalent-torque method yielded more conservative reductions of 1–17°C and 2–20°C.
Overall, each method represents a different workability mechanism: viscosity reflects binder flow, tribology reflects interfacial lubrication, and torque reflects mixture-scale resistance. WMA mixing temperature should therefore be determined using complementary binder- and mixture-scale indicators rather than a single criterion.

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