摘要
采用INSTRON 5500R 4206-006型微机控制电子万能试验机,对基于水泥、石灰和低钙粉煤灰的固化淤泥进行无侧限抗压强度试验和间接抗拉强度试验,得到标准养护360 d淤泥固化土的应力-应变关系、破坏强度和破坏应变。研究结果表明:固化剂掺入导致固化土破坏应变明显减小,无侧限抗压强度和抗拉强度明显增大,且破坏模式由塑性破坏逐渐向脆性破坏方向发展;从长期强度和经济成本角度,石灰-低钙粉煤灰固化剂完全可取代同配比水泥-低钙粉煤灰固化剂;淤泥固化土的无侧限抗压强度与抗拉强度之比为10左右;掺加适当配比粉煤灰的设计固化材料可考虑用作低强度交通负载公路路基材料。
For marine sediments solidified with cement, lime and low-calcium fly ash, the unconfined compressive strength tests and indirect tensile strength tests were performed by using a microcomputer-controlled electronic universal testing machine named INSTRON 5500R 4206-006, the stress-strain curve, failure strength and failure strain of samples at curing time of 360 d were determined. The results show that the incorporation of stabilizers causes the failure strain to decrease, the compressive strength and tensile strength of solidified sediments to increase, while the failure mode of solidified sediments develops gradually from plastic failure to brittle failure. The designed lime-low calcium fly ash stabilizer can completely replace cement-low calcium fly ash stabilizer from the point of view of economical cost and long-term strength. For solidified sediments, the ratio of unconfined compressive strength to tensile strength is about 10. Finally, the designed stabilizers with appropriate ratio of fly ash can be considered as roadbed materials for low-intensity traffic pavement.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第1期332-339,共8页
Journal of Central South University:Science and Technology
基金
国家留学基金资助项目(2008671011)
关键词
海相淤泥
粉煤灰
固化
长期强度
变形
marine sediment
fly ash
solidification
long-term strength
deformation
