發(fā)布時間：2019-04-27 01:32

【摘要】：為研究玻璃纖維增強砂漿(GRC)的長期耐堿性,對無網(wǎng)格布(NC)增強的試件、中堿玻璃纖維(CNP)網(wǎng)格布增強試件、低鋯玻璃纖維網(wǎng)格布(ARNP)增強試件和高鋯玻璃纖維網(wǎng)格布(ARNPH)增強試件分別進行了加速老化試驗、彎曲試驗和掃描電鏡試驗。試驗結(jié)果表明:網(wǎng)格布對GRC試件的開裂抗彎強度影響較小;隨著裂縫擴展,GRC試件在加載過程中出現(xiàn)撓度硬化現(xiàn)象并伴隨多條裂縫,玻璃纖維可顯著提高GRC試件承載能力;經(jīng)過加速老化后,玻纖因受到腐蝕,對GRC試件的增強作用隨著ZrO_2含量減小而減小;中堿玻璃纖維腐蝕后表面出現(xiàn)層狀剝落且纖維有效直徑減小,受腐蝕程度較深,低鋯玻璃纖維在腐蝕后表面出現(xiàn)點狀突起,未見層狀剝落,高鋯玻璃纖維在腐蝕后表面未見明顯變化。
[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.
【作者單位】： 大連理工大學(xué)海岸與近海工程國家重點實驗室;河南送變電工程公司;
【基金】：國家自然科學(xué)基金(51578109)
【分類號】：TU528

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