掺入炉底渣制备巷道支护砂浆的试验研究

Performance Test and Analysis of Roadway Support Mortar Prepared by Adding Furnace Bottom Slag

通过试验研究,分析以电厂炉底渣替代水泥制备的巷道支护砂浆性能。首先,按照不同的炉底渣掺量制备炉底渣水泥砂浆,并分别测试其硬化砂浆在3、7、28 d龄期的静态抗压强度;然后,应用Φ50 mm分离式霍普金森压杆试验装置,测试28 d龄期砂浆在不同平均应变率下的动态抗压强度和极限韧性。试验结果表明:砂浆的静态抗压强度随着炉底渣掺量的增加而提高;在80~170 s;平均应变率范围内,各组砂浆的动态抗压强度均随着平均应变率的增大而提高,炉底渣替代率为75%的砂浆动态抗压强度优于其他组;在同一应变率下,炉底渣替代率为75%的砂浆极限韧性最大,吸收能量的能力及抗冲击性能最强。

Through experimental research,the performance changes of roadway support mortar prepared by replacing cement with furnace bottom slag in power plant are analyzed.Furnace bottom slag cement mortar are prepared according to different furnace bottom slag content,and the static compressive strength of hardened mortar is tested at 3、7、28 d.The dynamic compressive strength and dynamic ultimate toughness of five kinds of mortars(28 d ages)at different average strain rates are tested withΦ50 mm Split Hopkinson pressure bar test device.The test results show that the static compressive strength increases with the increase of bottom slag.In the range of 80~170 s;average strain rates,the dynamic compressive strength of bottom slag increases with the increase of average strain rate,and the dynamic compressive strength of bottom slag with 75%replacement rate is higher than that of other groups.Under the same strain rate,the bottom slag with 75%replacement rate has the highest ultimate toughness,the strongest energy absorption ability and good impact resistance.