摘要
为提高级配碎石的回弹模量和抗剪切强度，降低沥青路面的疲劳开裂的可能性，提高其抗车辙能力，在无粘结级配碎石中掺加适量的二灰结合料，形成微粘结碎石，使其同时具有半刚性基层和级配碎石基层的优点。试验结果表明二灰的加入可以提高级配碎石的和易性，当填充系数在0．9～1．1之间时，压实系数提高5％，28d龄期的回弹模量达700MPa，塑性变形可降低60％，渗透系数满足排水性能要求；二灰微粘结级配碎石的二灰最佳外掺量为5．0％～7．0％之间，二灰：碎石的比例范围在4．5：95．5～6．5：93．5之间，二灰的配比宜采用石灰：粉煤灰：1：4。
In order to enhance resilient modulus and shear strength of graded aggregate, reduce the fatigue cracking probability and improve the ability of rut resistance, the suitable amount of lime-flyash was mixed in unbounded grading macadam to form a micro-bonded graded aggregates which has the advantages of semi-rigid base and unbounded grading aggregate base. Experimental result shows that （1） filling some lime-flyash can improve the level of workability of graded aggregates, when filling coefficient is between 0.9 and 1.1, the compaction coefficient increases by 5 %, resilient modulus in the age of 28 days reaches 700 Mpa, plastic deformation reduces by 60%, permeability coefficient meets the drainage requirements; （2） the best ash content of lime-flyash micro- bonded graded aggregate is 5.0% - 7.0%, the proportion of lime-flyash and gravel is in the range of 4.5：95.5 - 6.5 ： 93.5 ; and （3） the proportion of lime and flyash should be 1 ： 4.
出处
《公路交通科技》
CAS
CSCD
北大核心
2009年第11期31-35,共5页
Journal of Highway and Transportation Research and Development
基金
交通部西部交通建设科技项目(200631800086)
关键词
道路工程
微粘结级配碎石
二灰
弹性模量
永久变形
road engineering
micro-bonded graded aggregate
lime-flyash
elastic modulus
permanent deformation
