新水泥碎石基层  

New Cement Macadam Foundation

作　　者：沙庆林[1] 

机构地区：[1]交通部公路科学研究院,北京100088

出　　处：《铁道建筑技术》2009年第10期1-5,9,共6页Railway Construction Technology

摘　　要：详细介绍了粗集料断级配密实CBG-25的级配设计方法,7天龄期的无侧限抗压强度,得到的对抗压强度大小很少影响的级配范围,其上限为用于沥青混凝土的传统连续式密级配富勒曲线,下限为我国研究得到的粗集料中断级配。同是CBG-25,中断级配的收缩性显著小于连续式密级配。在设计抗压强度6 MPa和水泥剂量7%的情况下,基层夏季通车3个月,90%多的路段无横向收缩裂缝,彻底改变了以往水泥碎石基层每隔6～10 m产生一条收缩裂缝的状况。This Paper introduces in detail the grading design method for coarse aggregate gap graded （CAGG） dense cement bound granular （CBG）-25, also its unconfined compressive strength （UCS） and an insensitive gradation zone of CBG-25 for its UCS are obtained. The upper threshold of the zone is the traditional continuous dense gradation of asphalt concrete which is obtained by Fuller,s formula of USA; the lower threshold of the zone is the CAGG innovated in china. The shrinkage of CAGG CBG-25 is significantly less than that of continuous dense gradation. Although the design strength （ USC for 7 days） of CAGG CBG-25 is 6MPa and its cement content is 7% , after curing under the summer sun for three month, 90% of the test section of CAGG CBG-25 road base have no transverse shrinkage cracking, which changes the old situation that there would be a shrinkage cracking of cement macadam foundation in every 6 - 10 m.

关 键 词：粗集料断级配 水泥碎石 CBG-25级配设计方法 无侧限抗压强度 收缩裂缝 

分 类 号：TU521.25[建筑科学—建筑技术科学]