【摘要】：采用室內(nèi)針入度和PG分級(jí)雙指標(biāo)控制體系研究了青川巖瀝青、TB膠粉摻量對(duì)Terminal Blend膠粉改性瀝青性能的影響,采用熒光顯微鏡研究了天然瀝青對(duì)TB瀝青的增強(qiáng)作用和改性機(jī)理。基于車轍、MMLS1/3、低溫彎曲、凍融劈裂和浸水馬歇爾及四分點(diǎn)加載疲勞試驗(yàn)試驗(yàn)系統(tǒng)研究了青川巖瀝青與TB復(fù)合改性瀝青混合料的路用性能。試驗(yàn)結(jié)果表明,摻加青川巖瀝青與SBS顯著提高了TB瀝青及其混合料的高溫性能,同時(shí)在一定程度上保留了TB膠粉改性瀝青低溫性能突出的特點(diǎn);摻加青川巖瀝青后顯著提高了TB膠粉改性瀝青的PG高溫分級(jí),15%NES+15%TB+2.0%SBS、15%NES+20%TB+2.0%SBS、20%NES+15%TB+2.0%SBS三種改性瀝青PG分級(jí)可達(dá)到PG88-28、PG82-28、PG88-28。SBS與TB巖瀝青改性瀝青高溫性能和抗疲勞耐久性可達(dá)到甚至超過4.5%SBS改性瀝青混合料,TB巖瀝青復(fù)合改性瀝青混合料可在夏炎熱區(qū)和季節(jié)性冰凍區(qū)推廣應(yīng)用,將SBS與TB巖瀝青復(fù)配可有效降低SBS摻量。綜合考慮青川巖瀝青與TB膠粉摻量對(duì)復(fù)合改性瀝青高低溫性能的影響,兼顧瀝青混合料的高低溫性能和抗疲勞性能,可優(yōu)化出15%青川巖瀝青+20%TB膠粉、20%青川巖瀝青+20%TB膠粉、25%青川巖瀝青+15%TB膠粉3種SBS與TB青川巖瀝青復(fù)配方案。
[Abstract]:The effects of the content of TB-TB powder on the performance of Terminal Blend modified asphalt were studied by using the double index control system of penetration and PG classification. The enhancement effect and modification mechanism of natural asphalt to TB asphalt were studied by fluorescence microscope. Based on rutting MMLS 1 / 3, low temperature bending, freeze-thaw splitting, immersion Marshall and four-point loading fatigue test system, the pavement performance of Qingchuan rock asphalt and TB composite modified asphalt mixture was studied. The test results show that the high temperature performance of TB asphalt and its mixture is improved by adding Qingchuan rock asphalt and SBS, and the characteristic of low temperature performance of TB modified asphalt is retained to some extent. After the addition of Qingchuan bitumen, the PG high temperature classification of modified asphalt modified by TB rubber powder has been remarkably improved. The PG grade of 15%TB is 2.0NES 20%TB 2.0SBS20NES 15%TB 2.0%SBS. The PG classification of the three modified asphalts can reach the high temperature performance and fatigue durability of PG88-28,PG82-28,PG88-28.SBS and TB bitumen modified asphalt. The modified asphalt mixture beyond 4.5%SBS can be widely used in summer hot area and seasonal frozen area. The mixture of SBS and TB rock asphalt can effectively reduce the content of SBS. Considering the influence of the content of Qingchuan rock asphalt and TB rubber powder on the high and low temperature performance of the compound modified asphalt, the high and low temperature performance and the fatigue resistance of the asphalt mixture are considered. 15% Qingchuan bitumen 20%TB powder 20% Qingchuan bitumen 20%TB powder 25% Qingchuan bitumen 15%TB powder three kinds of SBS and TB Qingchuan bitumen compound scheme can be optimized.
【作者單位】： 包頭市交通規(guī)劃設(shè)計(jì)院;
【分類號(hào)】：U414

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