朱德举 彭卓 任京华 史才军 郭帅成

摘   要：对高温处理后的玄武岩织物增强碱激发矿渣粉煤灰砂浆试件进行了三点弯曲试验，并探讨了环氧涂层、基体类型、织物层数对玄武岩织物增强试件耐高温性能的影响. 试验结果表明：随著温度升高，由于基体和玄武岩纤维的劣化，玄武岩织物增强碱激发矿渣粉煤灰砂浆试件抗弯承载力近乎呈线性下降，并且破坏模式由多重开裂转变为单一裂缝破坏;经800 ℃高温处理1 h后，试件的残留抗弯强度仅为1.67 MPa. 改性环氧树脂浸渍在600 ℃以下对抗弯强度有增强作用，超过600 ℃时，随着环氧树脂的挥发和界面黏结性能下降，环氧浸渍试件的抗弯强度会大幅下降. 相比玄武岩织物增强硅酸盐水泥砂浆试件，碱激发砂浆试件表现出更好的耐高温性能，在400 ℃及以上高温情况下，抗弯强度的降幅更小. 织物层数在一定程度上能提高试件高温后的力学性能，但提高作用随温度升高逐渐减弱，当温度到600 ℃时，增加织物层数对涂覆处理后试件的抗弯承载力几乎没有影响.

关键词：玄武岩织物;碱激发;高温;力学性能;表面涂层

中图分类号：TB332                                文献标志码：A

Flexural Behavior of Basalt Textile Reinforced Alkali-activated

Mortar after Exposure to Elevated Temperatures

ZHU Deju1，2，3?，PENG Zhuo1，2，REN Jinghua1，2，SHI Caijun1，2，GUO Shuaicheng1，2

（1. Key Laboratory for Green & Advanced Civil Engineering Materials and Application

Technology （Hunan University） of Hunan Province，Changsha  410082，China;

2. College of Civil Engineering，Hunan University，Changsha 410082，China;

3. Shandong Tianyi High Technology Co，Ltd，Jining  272000，China）

Abstract：This study conducted the three-point bending tests to examine the flexural performance of the basalt textile reinforced alkali-activated slag-fly ash mortar after elevated temperature exposure. The influence of surface coating with the epoxy resin， number of textile layers and matrix type on the high-temperature resistance of basalt textile reinforced mortar specimens was also investigated. The experimental results indicated that the flexural strength of basalt textile reinforced alkali-activated slag-fly ash mortar specimens decreased almost linearly with the increase of temperature due to the deterioration of the matrix and basalt textile. And the failure morphology was also transformed from multiple-cracking mode to single-cracking mode. After heat exposure at 800 ℃ for 1h， the remained flexural strength of the specimens was only 1.67 MPa. Surface coating with epoxy resin enhanced the flexural strength under the exposure temperature below 600 ℃. Due to the decomposition of epoxy resin and the deterioration of the bond between fiber and matrix， significant strength loss can be observed when the exposure temperature was higher than 600 ℃. Compared with the basalt textile reinforced Portland cement mortar specimens， the alkali-activated mortar specimens owned better high-temperature resistance， and less strength loss under the exposure temperature above 400 ℃. An increase in the number of textile layers can enhance the mechanical properties of specimens after exposure to elevated temperatures to a certain extent， but the enhancement gradually weakened with the increase of temperature. And the improvement to the flexural bearing capacity became insignificant for the epoxy coated specimen after the exposure temperature reached 600 ℃.

Key words：basalt textile;alkali-activated material;elevated temperature;mechanical performance;surface coating

碱激发胶凝材料是指使用激发剂（苛性碱、碱性盐）活化铝硅酸盐掺合料（粒化高炉矿渣、粉煤灰、偏高岭土等）得到的胶凝材料[1]. 使用碱激发胶凝材料代替硅酸盐水泥可以有效降低能耗和碳排放，实现对工业废渣的有效利用，碱激发材料具有更优异的抗酸腐蚀、硫酸盐侵蚀和……