加速老化对纤维网格布增强水泥基材料弯曲性能的影响
发布时间：2019-04-27 01:32
【摘要】：为研究玻璃纤维增强砂浆(GRC)的长期耐碱性,对无网格布(NC)增强的试件、中碱玻璃纤维(CNP)网格布增强试件、低锆玻璃纤维网格布(ARNP)增强试件和高锆玻璃纤维网格布(ARNPH)增强试件分别进行了加速老化试验、弯曲试验和扫描电镜试验。试验结果表明:网格布对GRC试件的开裂抗弯强度影响较小;随着裂缝扩展,GRC试件在加载过程中出现挠度硬化现象并伴随多条裂缝,玻璃纤维可显著提高GRC试件承载能力;经过加速老化后,玻纤因受到腐蚀,对GRC试件的增强作用随着ZrO_2含量减小而减小;中碱玻璃纤维腐蚀后表面出现层状剥落且纤维有效直径减小,受腐蚀程度较深,低锆玻璃纤维在腐蚀后表面出现点状突起,未见层状剥落,高锆玻璃纤维在腐蚀后表面未见明显变化。
[Abstract]:In order to study the long-term alkali resistance of glass fiber reinforced mortar (GRC), the medium alkali glass fiber (CNP) mesh cloth reinforced test piece was used for the non grid cloth (NC) reinforced sample. The accelerated aging test, bending test and scanning electron microscope (SEM) test of low zirconium glass fiber mesh cloth (ARNP) reinforced specimens and high zirconium glass fiber mesh cloth (ARNPH) reinforced specimens were carried out. The experimental results show that the crack bending strength of GRC specimen is less affected by the mesh cloth, and with the crack propagation, the deflection hardening of GRC specimen appears in the process of loading and accompanied by many cracks, the loading capacity of GRC specimen can be significantly improved by glass fiber, and the load-bearing capacity of GRC specimen can be greatly improved by glass fiber. After accelerated aging, the glass fiber was corroded, and the reinforcing effect of glass fiber on GRC specimens decreased with the decrease of ZrO_2 content. After corrosion, lamellar spalling occurs on the surface of the medium alkali glass fiber, and the effective diameter of the fiber decreases, and the corrosion degree is deeper. The surface of the low zirconium glass fiber has a dot protuberance after corrosion, and no lamellar spalling has been observed. There was no obvious change on the surface of high zirconium glass fiber after corrosion.
【作者单位】： 大连理工大学海岸与近海工程国家重点实验室;河南送变电工程公司;
【基金】：国家自然科学基金(51578109)
【分类号】：TU528
本文编号：2466574
[Abstract]:In order to study the long-term alkali resistance of glass fiber reinforced mortar (GRC), the medium alkali glass fiber (CNP) mesh cloth reinforced test piece was used for the non grid cloth (NC) reinforced sample. The accelerated aging test, bending test and scanning electron microscope (SEM) test of low zirconium glass fiber mesh cloth (ARNP) reinforced specimens and high zirconium glass fiber mesh cloth (ARNPH) reinforced specimens were carried out. The experimental results show that the crack bending strength of GRC specimen is less affected by the mesh cloth, and with the crack propagation, the deflection hardening of GRC specimen appears in the process of loading and accompanied by many cracks, the loading capacity of GRC specimen can be significantly improved by glass fiber, and the load-bearing capacity of GRC specimen can be greatly improved by glass fiber. After accelerated aging, the glass fiber was corroded, and the reinforcing effect of glass fiber on GRC specimens decreased with the decrease of ZrO_2 content. After corrosion, lamellar spalling occurs on the surface of the medium alkali glass fiber, and the effective diameter of the fiber decreases, and the corrosion degree is deeper. The surface of the low zirconium glass fiber has a dot protuberance after corrosion, and no lamellar spalling has been observed. There was no obvious change on the surface of high zirconium glass fiber after corrosion.
【作者单位】： 大连理工大学海岸与近海工程国家重点实验室;河南送变电工程公司;
【基金】：国家自然科学基金(51578109)
【分类号】：TU528
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