有机聚合物聚乙烯醇与无机纳米SiO2杂化改性材料对再生骨料性能强化的影响研究
Study on effect of hybrid modified materials of organic polymer polyvinyl alcohol and inorganic nano SiO2 on performance enhancement of recycled aggregates
关键词：
聚乙烯醇；纳米SiO2；有机-无机杂化改性材料；再生粗骨料；强化方式；密度；吸水率；压碎指标
Key words：
Polyvinyl alcohol; Nano SiO2; Organic-inorganic hybrid modified material; Recycled coarse aggregate; Strengthening method; Density; Water absorption rate; Crushing index
刊期：
2025年第10期
DOI：
10.19761/j.1000-4637.2025.10.116.06
文章编号：
基金项目：
广东省重点领域研发计划项目（2019B111107003）。
作者：
杨正松1，2，辛晓婷2，辛继宝2，黎维彬1，*，何浩源2
单位：
1.清华大学深圳国际研究生院，广东 深圳 518000；2.深圳市华威环保建材有限公司， 广东 深圳 518000
摘要
摘 要：采用自制有机聚合物聚乙烯醇与无机纳米SiO2杂化改性材料对再生粗骨料进行强化处理，研究了不同强化方式（浸泡、喷洒）对再生粗骨料堆积密度、表观密度、吸水率和压碎指标的影响，其中，浸泡强化时间分别为1、2、3、5、8、12、24、36、48 h，喷洒次数分别为1、2、3次，并分析了强化机理。结果表明：与天然粗骨料相比，未强化再生粗骨料的表观密度、堆积密度均较低，压碎指标、24 h吸水率均较大；随着浸泡强化时间的增加，再生粗骨料的表观密度变化不大，2 h、24 h吸水率基本呈先降低后略微增大的趋势，压碎指标基本呈降低趋势；随着喷洒次数的增加，再生粗骨料的表观密度变化不大，但2 h、24 h吸水率和压碎指标均呈降低趋势。
Abstract: Self made hybrid modified material of organic polymer polyvinyl alcohol and inorganic nano SiO2 was used to strengthen recycled coarse aggregates. The effects of different strengthening methods (soaking, spraying) on the bulk density, apparent density, water absorption rate, and crushing index of recycled coarse aggregates were studied. The soaking strengthening time was 1, 2, 3, 5, 8, 12, 24, 36, 48 h, and the spraying frequency was 1, 2, 3 times, respectively. The strengthening mechanism was analyzed. The results show that compared with natural coarse aggregate, unreinforced recycled coarse aggregate has lower apparent density and bulk density, and higher crushing index and 24 h water absorption rate. With the increase of soaking strengthening time, the apparent density of recycled coarse aggregate does not change significantly, the 2 h and 24 h water absorption rate show a trend of first decreasing and then slightly increasing, and the crushing index shows a decreasing trend. With the increase of spraying frequency, the apparent density of recycled coarse aggregate does not change significantly, but the 2 h and 24 h water absorption rate and crushing index decrease.
结论
（1）与天然粗骨料相比，未强化再生粗骨料的表观密度、堆积密度较低，压碎指标、吸水率较大。
（2）浸泡强化方式对再生粗骨料表观密度的影响很小；随着浸泡强化时间的增加，再生粗骨料的2 h、24 h吸水率基本呈先降低后略微增大的趋势，压碎指标基本呈降低趋势。总体上，本文建议再生粗骨料的最佳浸泡强化时间为12 h。
（3）喷洒强化方式对再生粗骨料表观密度的影响很小；随着喷洒次数的增加，再生粗骨料的2 h、24 h吸水率和压碎指标均降低。另外，与12 h浸泡强化方式相比，3次喷洒强化方式对再生粗骨料吸水率和压碎指标的降低效果更好。
（4）浸泡强化法和喷洒强化法均能增强再生粗骨料的性能，但浸泡时间越久，改性剂用量越多，喷洒次数越多，机械能耗越高。因此，实际应用时，需综合考虑强化再生粗骨料的性能、强化材料用量、操作方式、时间成本等因素，根据需要选择合适的强化方式。
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引用本文
杨正松,辛晓婷,辛继宝,等.有机聚合物聚乙烯醇与无机纳米SiO2杂化改性材料对再生骨料性能强化的影响研究[J].混凝土与水泥制品,2025(10):116-121.
YANG Z S,XIN X T,XIN J B,et al.Study on effect of hybrid modified materials of organic polymer polyvinyl alcohol and inorganic nano SiO2 on performance enhancement of recycled aggregates[J].China Concrete and Cement Products,2025(10):116-121.
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