Design method of warm mix asphalt based on Marshall test under variable temperatures and compaction times
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摘要: 为了建立温拌沥青混合料组成设计方法, 在不同温度和击实次数下进行了AC-13C温拌沥青混合料的马歇尔击实试验, 分析了温拌沥青混合料体积特性。分析结果表明: 随着击实温度的降低和击实次数的减少, 温拌沥青混合料的空隙率和矿料间隙率增大, 沥青饱和度降低; 与热拌沥青混合料相比, 温拌沥青混合料中沥青被集料吸收的含量(质量分数)、有效沥青含量和沥青膜厚度变化很小, 并确定了AC-13C温拌沥青混合料的最佳沥青用量为4.7%。根据体积特性确定了温拌沥青混合料的成型温度, 与热拌沥青混合料相比, 温拌基质沥青混合料的成型温度降低约为10℃~20℃, 温拌SBS改性沥青混合料的成型温度降低约为10℃; 温拌沥青混合料具有更好的可压实性, 与热拌沥青混合料相比, 温拌基质沥青混合料击实次数降低约为20%, 温拌SBS改性沥青混合料的击实次数降低约为10%。Abstract: In order to establish the mixture design method for warm mix asphalt (WMA), Marshall test was conducted under variable temperatures and compaction times to prepare AC-13C WMA specimens, and the volume characteristics of WMA specimens were researched. Analysis result indicates that the air void volume (VV) and the percent voids in mineral aggregate (VMA) increase with the decrease of compaction temperatures and compaction times, but the percent voids in mineral aggregate that are filled with asphalt (VFA) decrease. Compared with hot mix asphalt (HMA), the asphalt content absorbed by aggregates, the effective asphalt content (mass fraction) and the thickness of asphalt film in WMA differ a little, and the optimum asphalt content of AC-13C WMA is 4.7%. According to the volume characteristics, the compaction temperatures of WMAs are determined, and the compaction temperatures of WMAs with matrix asphalt and SBS modified asphalt decrease by about 10 ℃-20 ℃ and 10 ℃ respectively. WMA compactibility is better, and the compaction times of WMAs with matrix asphalt and SBS modified asphalt decrease by about 20% and 10% respectively.
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Table 1. Gradation of AC-13C
Sieve size/mm 16 13.2 9.5 4.75 2.36 1.18 0.6 0.3 0.15 0.075 Passing rate/% 100.00 95.05 72.23 44.26 33.13 24.09 17.01 11.83 8.14 5.10 
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Table 2. Marshall test result of AC-13C HMAs
Type of asphalt Bulk specific gravity Measured theoretical maximum specific gravity Stability/kN Flow value/0.1 mm VV/% VMA/% VFA/% 70# 2.463 2.566 10.88 35.2 3.91 13.3 70.6 SBS 2.431 2.538 11.22 35.2 4.28 14.3 70.2
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Table 3. Compaction temperatures and compaction times of WMA with matrix asphalt
Indices Specification requirement Compaction temperature/℃ Compaction times VV/% 4-6 110-145 75 or 55 VMA/% 14-16 105-135 75 or 55 VFA/% 65-75 125-145 75 or 55 Marshall stability/kN ≥8 100-145 75 or 55
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Table 4. Compaction temperatures and compaction times for WMA with SBS modified asphalt
Indices Specification requirement Compaction temperature/℃ Compaction times VV/% 4-6 140-170 75 or 55 VMA/% 14-16 145-170 75 or 55 VFA/% 65-75 > 145 75 or 55 Marshall stability/kN ≥8 125-145 75 or 55
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