Moisture Susceptibility of SBS and Coarse Crumb Rubber Composite Modified Asphalt Permeable Mixture
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摘要: 排水沥青混凝土孔隙率大，具有良好的排水、降噪功能，但是易发生水损害. 使用粗橡胶粉和SBS（styrene-butadiene-styrene block copolymer）改性剂对基质沥青进行复合改性. 采用冻融劈裂强度比对透水沥青混合料的抗水损害性能进行评价. 研究SBS用量、最大公称粒径、粗橡胶粉用量、级配各筛孔通过率、消石灰用量和沥青用量6个影响因素对透水沥青混凝土抗水害损性能的影响，揭示粗橡胶粉SBS复配沥青混合料的抗水损害机理. 研究结果表明：SBS用量的增加、集料最大公称粒径的增大、消石灰的加入均能提高透水混合料的冻融劈裂强度比；为了获得最佳的水稳定性和良好的经济性，建议SBS与粗橡胶粉的最佳掺量分别为6%和10%，并且通过灰关联分析得出了影响各规格混合料抗水损害性能的关键筛孔.Abstract: Permeable asphalt concrete (PAC) possesses good capacity of drainage and noise reduction due to its large porosity. Nevertheless, it is prone to suffer water damage. Coarse crumb rubber (CCR) and styrene-butadiene-styrene block copolymer (SBS) were used to prepare composite modified asphalt. Freeze-thaw splitting tensile strength ratio (TSR) was employed to evaluate the moisture susceptibility of PAC. The influences of the contents of SBS, coarse crumb rubber, asphalt binder, and hydrated lime as well as the nominal maximum particle size (NMPS) and passing percentage of key sieve sizes on the moisture susceptibility of PAC were explored to reveal the moisture damage resistance mechanism of SBS and CCR composite modified asphalt (SBS/CRMA) mixture. The results indicate that the increases in SBS content, the NMPS of aggregates, and the addition of slaked lime can effectively increase the TSR value. To optimize moisture susceptibility and cost efficiency, it is recommended that the favorable contents of SBS and CCR are 6% and 10%, respectively. Moreover, through grey relational analysis, the key sieve sizes that affect the moisture susceptibility of permeable asphalt mixtures with various NMPS were presented as well.
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图 1 SBS掺量对冻融劈裂性能的影响
Figure 1. Effect of SBS contents on freeze-thaw splitting performance
图 2 粗橡胶粉掺量对PAC10冻融劈裂性能的影响
Figure 2. Effect of coarse crumb rubber content on freeze-thaw splitting performance
图 4 不同级配规格混合料的冻融劈裂剖面
Figure 4. Freeze-thaw splitting fractural surfaces of mixtures with different NMPS
图 5 不同消石灰掺量对冻融劈裂强度的影响
Figure 5. Influence of slaked lime contents on freeze-thaw splitting strengths
图 6 各筛孔通过率与劈裂强度、TSR灰色关联度结果
Figure 6. Gray correlations between passing percentages of each sieve size，splitting strength and TSR
图 7 不同沥青用量的混合料冻融劈裂结果
Figure 7. Freeze-thaw cracking results of mixtures with different asphalt contents
表 1 不同透水沥青混合料级配各筛孔通过率
Table 1. Gradations of PAC with various nominal maximum particle sizes
% 级配编号 筛孔/mm 26.000 19.000 16.000 13.200 9.500 4.750 2.360 1.180 0.600 0.300 0.150 0.075 PAC10 #1 100.0 100.0 100.0 100.0 98.9 56.5 15.0 9.2 8.8 8.4 8.1 7.1 PAC10 #2 100.0 100.0 100.0 100.0 98.9 54.1 12.1 6.6 6.5 6.4 6.4 5.8 PAC10 #3 100.0 100.0 100.0 100.0 98.9 56.4 12.5 6.6 6.5 6.5 6.4 5.9 PAC10 #4 100.0 100.0 100.0 100.0 98.9 54.1 15.3 9.9 9.1 8.3 7.7 6.6 PAC10 #5 100.0 100.0 100.0 100.0 98.9 54.2 18.6 13.2 11.7 10.2 9.0 7.4 PAC13 #1 100.0 100.0 100.0 85.0 69.4 26.9 11.7 10.4 9.7 9.0 8.4 7.2 PAC13 #2 100.0 100.0 100.0 85.0 69.2 22.2 10.0 9.4 8.7 8.0 7.4 6.3 PAC13 #3 100.0 100.0 100.0 85.0 69.4 26.9 11.7 10.2 9.4 8.5 7.7 6.5 PAC13 #4 100.0 100.0 100.0 85.0 69.3 25.4 13.9 12.7 11.3 9.9 8.7 7.0 PAC13 #5 100.0 100.0 100.0 85.0 69.4 28.5 17.8 16.0 14.0 11.8 10.0 7.8 PAC16 #1 100.0 100.0 99.9 72.6 45.1 17.0 9.8 9.2 8.5 7.8 7.2 6.1 PAC16 #2 100.0 100.0 99.9 72.6 45.1 19.4 12.7 11.7 10.5 9.2 8.2 6.7 PAC16 #3 100.0 100.0 99.9 72.6 45.2 21.7 15.7 14.2 12.5 10.6 9.2 7.2 PAC16 #4 100.0 100.0 99.9 72.1 44.1 18.4 11.7 10.9 9.8 8.7 7.8 6.5 PAC20 #1 100.0 96.7 92.0 77.5 51.0 17.9 10.0 9.4 8.7 7.9 7.3 6.3 PAC20 #2 100.0 96.7 92.0 77.5 51.1 20.2 12.9 11.9 10.7 9.4 8.3 6.8 PAC20 #3 100.0 96.7 92.0 77.5 51.1 22.6 15.8 14.4 12.7 10.8 9.3 7.4 PAC20 #4 100.0 96.7 92.0 77.5 51.1 21.0 13.9 12.7 11.3 9.9 8.7 7.0 
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表 2 不同级配规格透水沥青混合料的性能试验结果
Table 2. Performance test results for different types of PAC
规格 劈裂强度/MPa TSR/% MS/kN γf γt 冻融组 未冻融组 PAC20 0.46 0.55 83.64 6.59 2.010 2.518 PAC16 0.42 0.54 78.35 6.36 2.020 2.511 PAC13 0.30 0.45 65.75 6.00 1.963 2.495 PAC10 0.22 0.36 60.42 5.71 1.888 2.469
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