用于薄层罩面的SMA-8组成设计、工艺及路用性能试验研究
发布时间：2018-10-14 13:22
【摘要】：SMA混合料路面自出现到目前已经有很长的时间,在我国的应用也有十多年的历史。我国SMA常应用于新建道路,而且最大公称粒径一般都大于13.2mm。在一些工程中,最大工程粒径为9.5mm的SMA混合料也有过成功的应用,但一般其最大粒径都为13.2mmm,当用于修筑更薄的罩面层时,粒径有些大,所以需要向更细粒径方向着手研究。我国规范中的粒径没有8mm档设置,从4.75mm直接到9.5mm。本文通过进行不同级配设计因素分析提出了SMA-8级配设计要求,将SMA-8的9.5mmm通过率设计为100%,而利用特制8mm孔筛验证集料8mm筛孔通过率大于90%。SMA-8混合料最大公称粒径比SMA-10小,可以减小路面厚度,更适合作为薄层罩面用于预防性养护工程,而且比SMA-5的级配粗,更能保证路面的抗滑性能。首先结合2.36～4.75mm集料含量范围对集料体特性的影响、最大公称粒径与路面厚度的匹配性以及结合其他比较成功的罩面层级配给出了SMA-8的级配范围。对不同的级配设计进行了马歇尔试验,从油石比、两档粗集料配合比和关键筛孔通过率三方面分析了SMA-8的体积特性,结合两种不同的温拌剂对其击实效果进行了相关分析。结果表明,对体积指标影响最大的是关键筛孔通过率,其次是油石比,两档粗集料含量比对体积指标的影响最小。然后进行了路用性能研究,分析了SMA-8以及不同温拌剂掺量时的高温性能、低温性能和水稳定性。最后通过小型直道加速加载试验对SMA-8等不同罩面层的长期性能进行了试验分析,表明SMA-8具有较好的长期性能及耐久性。
[Abstract]:SMA mixture pavement has been used in our country for more than ten years. In China, SMA is often used in newly built roads, and the maximum nominal particle size is generally larger than 13.2 mm. In some projects, the SMA mixture with the maximum engineering particle size of 9.5mm has been successfully applied, but generally its maximum particle size is 13.2mmm.When it is used to build a thinner overlay, the particle size is a little large, so it needs to be studied in the direction of finer particle size. The particle size in Chinese standard has no 8mm file setting, from 4.75mm directly to 9.5 mm. By analyzing the factors of different gradation design, this paper puts forward the design requirements of SMA-8 gradation. The 9.5mmm pass rate of SMA-8 is designed to be 100, while the pass rate of 8mm sieve of aggregate is larger than that of 90%.SMA-8 mixture, which is smaller than SMA-10 by using special 8mm sieve. It can reduce the thickness of the pavement, and is more suitable for preventive maintenance engineering as a thin layer covering, and can ensure the anti-skid performance of the pavement better than the gradation of SMA-5. Firstly, combining the effect of 2.36~4.75mm aggregate content range on aggregate properties, the matching of maximum nominal particle size with pavement thickness and other successful overlay levels, the gradation range of SMA-8 is given. Marshall test was carried out on different gradation design. The volume characteristics of SMA-8 were analyzed from three aspects: oil / stone ratio, mixture ratio of two coarse aggregate and pass rate of key sieve hole. The compaction effect of SMA-8 was analyzed by combining two different warm mixing agents. The results show that the most important influence on volume index is the pass rate of the key sieve hole, followed by the ratio of oil to stone, and the ratio of coarse aggregate content of two grades has the least effect on the volume index. Then the road performance was studied, and the high temperature performance, low temperature performance and water stability of SMA-8 and different content of warm mixing agent were analyzed. Finally, the long term performance of different covering layers such as SMA-8 is analyzed by the accelerated loading test of small straight channel. The results show that SMA-8 has better long-term performance and durability.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414
本文编号：2270588
[Abstract]:SMA mixture pavement has been used in our country for more than ten years. In China, SMA is often used in newly built roads, and the maximum nominal particle size is generally larger than 13.2 mm. In some projects, the SMA mixture with the maximum engineering particle size of 9.5mm has been successfully applied, but generally its maximum particle size is 13.2mmm.When it is used to build a thinner overlay, the particle size is a little large, so it needs to be studied in the direction of finer particle size. The particle size in Chinese standard has no 8mm file setting, from 4.75mm directly to 9.5 mm. By analyzing the factors of different gradation design, this paper puts forward the design requirements of SMA-8 gradation. The 9.5mmm pass rate of SMA-8 is designed to be 100, while the pass rate of 8mm sieve of aggregate is larger than that of 90%.SMA-8 mixture, which is smaller than SMA-10 by using special 8mm sieve. It can reduce the thickness of the pavement, and is more suitable for preventive maintenance engineering as a thin layer covering, and can ensure the anti-skid performance of the pavement better than the gradation of SMA-5. Firstly, combining the effect of 2.36~4.75mm aggregate content range on aggregate properties, the matching of maximum nominal particle size with pavement thickness and other successful overlay levels, the gradation range of SMA-8 is given. Marshall test was carried out on different gradation design. The volume characteristics of SMA-8 were analyzed from three aspects: oil / stone ratio, mixture ratio of two coarse aggregate and pass rate of key sieve hole. The compaction effect of SMA-8 was analyzed by combining two different warm mixing agents. The results show that the most important influence on volume index is the pass rate of the key sieve hole, followed by the ratio of oil to stone, and the ratio of coarse aggregate content of two grades has the least effect on the volume index. Then the road performance was studied, and the high temperature performance, low temperature performance and water stability of SMA-8 and different content of warm mixing agent were analyzed. Finally, the long term performance of different covering layers such as SMA-8 is analyzed by the accelerated loading test of small straight channel. The results show that SMA-8 has better long-term performance and durability.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414
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相关期刊论文 前1条
1 龙起易，龙期威，，穆在勤;理想的分形模型和实际的嵌套结构[J];物理;1994年03期
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