CAJ | 학술논문

为更好地将天然沥青应用于路面，通过在基质沥青中掺加不同剂量的四川天然沥青，对天然沥青改性沥青的高温性能、粘附性、低温性能和水稳定性等路用性能进行了分析。试验结果表明，将四川天然沥青掺加基质沥青能够大大提高和改善基质沥青的高温性、粘附性以及水稳定性，并且随着天然沥青剂量的逐渐增加，沥青由溶胶型沥青向溶—凝胶型沥青转化，其高温稳定性、粘附性及水稳定性逐渐增强。天然沥青对基质沥青的低温流变性则表现为双重性，低温延度有所下降，但当量脆点指标却得以改善，且其玻璃化温度相对于基质沥青有所升高。掺入天然沥青后改性沥青混合料在低温时的最大拉应变、抗弯拉强度和劲度模量均增加，表明低温抗裂性能总体上得以改善，但柔韧性有所下降。
위경호지장천연력청응용우로면，통과재기질력청중참가불동제량적사천천연력청，대천연력청개성력청적고온성능、점부성、저온성능화수은정성등로용성능진행료분석。시험결과표명，장사천천연력청참가기질력청능구대대제고화개선기질력청적고온성、점부성이급수은정성，병차수착천연력청제량적축점증가，력청유용효형력청향용—응효형력청전화，기고온은정성、점부성급수은정성축점증강。천연력청대기질력청적저온류변성칙표현위쌍중성，저온연도유소하강，단당량취점지표각득이개선，차기파리화온도상대우기질력청유소승고。참입천연력청후개성력청혼합료재저온시적최대랍응변、항만랍강도화경도모량균증가，표명저온항렬성능총체상득이개선，단유인성유소하강。
For better use of natural asphalt to pavement, different doses of Sichuan natural rock as-phalt were mixed in petroleum base asphalt, and the pavement performance including high tempera-ture performance, adhesion, low temperature performance and water stability of the base asphalt modified with natural rock asphalt was analyzed. Test results show that after the petroleum matrix as-phalt is modified with Sichuan natural asphalt, the high temperature performance, adhesion and wa-ter stability can be improved greatly. With the increase of natural asphalt, the modified asphalt transforms from sol to gel, and the high temperature stability, adhesion and water stability are en-hanced gradually. But the low temperature rheology of the modified asphalt appears duality. The low-temperature ductility decreases, but the index of equivalent brittle point improves. And its vitri-fication temperature was increased compared with that of the matrix asphalt. After the incorporation of asphalt mixture with natural asphalt, the maximum tensile strain, flexural strength and stiffness modulus at low temperature increase, which shows that the overall crack resistance at low tempera-ture is improved with decreased flexibility.