脱硫胶粉在乳化改性沥青中的应用

Application of reclaimed rubber powder in emulsified modified asphalt

考察了不同规格胶粉及不同脱硫程度的脱硫胶粉对橡胶改性乳化沥青性能的影响,结果表明,采用100目胶粉即可制备出橡胶改性乳化沥青,但乳化沥青的性能较差;采用活化度为50%左右的100目脱硫胶粉制备乳化沥青时,脱硫胶粉的用量相比于胶粉可大幅提高;在通过外掺100目50%左右活化度的脱硫胶粉(质量分数15%,以沥青计,下同)和质量分数2%的苯乙烯-丁二烯-苯乙烯嵌段共聚物改性的乳化沥青中添加质量分数1%的丁苯胶乳,所制备橡胶改性乳化沥青无筛上剩余物,5 d储存稳定性为2.9%,蒸发残留物的25℃针入度、软化点和5℃延度分别为55 (0.1 mm)、64.5℃和22.5 cm,能够满足乳化改性沥青的技术指标要求。

The effect of different sizes of tire rubber powder and different degree of reclaimed rubber powder on performance of rubber modified emulsified asphalt were investigated.The results showed that the rubber modified emulsified asphalt could be prepared by using 100 mesh rubber powder,but the performance of emulsified asphalt was poor.When using 100 mesh reclaimed rubber powder with activation degree of about 50%to prepare emulsified asphalt,the amount of reclaimed rubber powder could be greatly increased compared with rubber powder.By adding mass fraction 1%(by asphalt,the same below)styrene-butadiene latex into the emulsified asphalt modified by 100 mesh reclaimed rubber powder with activation degree of about 50%(mass fraction 15%)and mass fraction 2%styrene-buta-diene-styrene block copolymer,the emulsified modified asphalt was prepared without sieve residue,and its storage stability for 5 d was 2.9%,penetration(25℃),softening point and ductility(5℃)of the evaporation residue were 55(0.1 mm),64.5℃and 22.5 cm respectively,which could meet the specification requirements of emulsified modified asphalt.