铝酸酯改性矿粉的研制及其对SBS改性AC-20C水稳定性能的影响

李文，马盛盛，郑剑锋

济南市市政工程设计研究院（集团）有限责任公司，山东 济南  250003

摘要：为研究铝酸酯改性矿粉对SBS改性AC-20C水稳定性能的影响，以石灰岩矿粉为原料，铝酸酯为改性剂，采用化学方法制备铝酸酯改性石灰岩矿粉，以吸油值和活化度为评价指标，采用正交试验研究其最佳改性工艺，通过荧光显微镜对比普通矿粉和铝酸酯改性矿粉沥青胶浆的微观特征，对掺加铝酸酯矿粉的SBS改性AC-20C试件进行残留稳定度和冻融劈裂强度试验。结果表明：铝酸酯改性矿粉的最佳改性条件为改性温度80 ℃，铝酸酯矿粉在SBS改性AC-20C中的质量分数为1.0%，改性时间50 min；掺加铝酸酯改性矿粉的SBS改性AC-20C的活化度是普通矿粉AC-20C的27.9倍，吸油值减小58.7%；在水稳定性能方面，掺入铝酸酯改性矿粉的SBS改性AC-20C的残留稳定度比普通矿粉AC-20C增大4.48%，冻融劈裂强度比增大6.52%，铝酸酯改性矿粉可有效提高SBS改性AC-20C的水稳定性能。

关键词：沥青混合料；铝酸酯；石灰岩矿粉；改性条件；沥青胶浆；水稳定性能

Development of aluminate modified mineral powder and its effect on the water stability of SBS modified AC-20C

LI Wen, MA Shengsheng, ZHENG Jianfeng

Jinan Municipal Engineering Design and Research Institute (Group) Co., Ltd., Jinan 250003, China

Abstract: To study the effect of aluminum ester modified mineral powder on the water stability performance of SBS modified AC-20C, limestone mineral powder is used as raw material, and aluminum ester served as the modifier. Aluminum ester modified limestone mineral powder is prepared using a chemical method, with oil absorption value and activation degree selected as evaluation indicators. An orthogonal experiment is conducted to explore the optimal modification process. The microstructural characteristics of ordinary mineral powder and aluminum ester modified mineral powder asphalt mastic are compared using fluorescence microscopy. Residual stability and freeze-thaw splitting strength tests are performed on the aluminum ester modified AC-20C specimens. The results show that the optimal modification conditions for aluminum ester modified mineral powder are a test temperature of 80 ℃, a mass fraction of aluminum ester mineral powder of 1.0%, and a modification time of 50 minutes. The activation degree of SBS modified AC-20C with aluminum ester modified mineral powder is 27.9 times that of ordinary mineral powder AC-20C, while the oil absorption value decreases by 58.7%. In terms of water stability performance, the residual stability of SBS modified AC-20C with aluminum ester modified mineral powder increases by 4.48% compared to ordinary mineral powder AC-20C, and the freeze-thaw splitting strength increases by 6.52%. Aluminum ester modified mineral powder can effectively improve the water stability performance against stripping of SBS modified AC-20C.

Keywords: asphalt mixture; Aluminate; limestone mineral powder; modification condition; asphalt mastic; water stability performance