以矿渣为主要组分的环保型路面基层结合料及其稳定土的力学性能

利用碱钙硫复合激发矿渣粉潜在活性的机理,以水泥的强度、凝结时间、抗裂性为技术指标研制出了2种环保的新型路面基层结合料(NSB),该结合料的矿渣粉用量达到了75%.通过对NSB稳定细粒土与级配碎石的力学性能试验,分析了NSB用在稳定土中的可行性.结果表明:这2种NSB都具备了缓凝、抗裂性好的优点,且强度超过了半刚性路面基层对水泥的技术要求;用NSB稳定细粒土与级配碎石,具有抗压强度、弯拉强度与劈裂强度均较高、最大弯拉应变较大的特点;同时用数据说明了2种结合料对土有选择性,石灰石掺量为2%的NSB1适合稳定级配碎石,而石灰石掺量为4%的NSB2适合稳定细粒土.所有的研究表明这2种NSB能够满足半刚性基层的需求.

Road Base Binder Using Slag as Main Component and Its Mechanical Property of Stabilized Soil

Taken strength, setting time and resistant cracking of cement as technical indexes, two kinds of enviwnmental-friendly new slag binder (NSB) were developed by using the potential active mechanism of alkali calcium sulfur compound stimulating slag powder. The NSB contains the amount of 75 % slag powder. Through testing the mechanical property of NSB stabilized fine-grained soil and graded broken stone, the feasibility of using NSB as stabilized soil was verified. Experimental result shows that (1) both NSBs have the properties of good anti-crack capability and retardation as well as the intensity above the requirement stipulated in the relative standard; (2) the stabilized fine-grained soil and graded broken stone of the two NSBs have costively higher compressive strength, flexuml-tensile strength, splitting strength and flexural-tensile strain value; (3) the two binders have selectivity to soil: NSB1 containing 2% limestone is fit for graded broken stone and NSB2 containing 4% limestone is suitable for fine-grained soil. All the tests indicate that the two NSB can meet the requirements of binder for road base.