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范杰林

（ 新疆維吾爾自治區交通運輸綜合行政執法局 ，新疆 烏魯木齊 830000)

摘   要 ：為研究礦物摻合料改良預應力孔道壓漿材料的力學性能，室內利用粉煤灰礦物摻合料制備了新型 孔道壓漿( FADG)材料，對不同養護齡期的FADG 砂漿材料開展流動度、單軸壓縮強度 、抗折強度 、膨脹性和泌水性試驗，并基于微觀電鏡掃描從微觀結構角度展開研究 。結果表明 ：粉煤灰礦物摻合料能夠加強普通水泥 孔道壓漿材料的流動性，但對孔道壓漿材料的早期抗壓強度和抗折強度有著非常明顯的劣化效應；養護齡期為 28 d 的抗壓強度和抗折強度均呈現出先升高后降低的變化趨勢 ；新型 FADG 材料中粉煤灰的最優配比為 20% , 此時其初始流動度為13 . 25 s ,  抗壓強度和抗折強度分別為 78. 88 MPa 和 12. 92 MPa ,  無泌水和倒縮現象，養護成型材料的內部結構致密 ，綜合工程性能最佳。

關鍵詞 ：粉煤灰 ；孔道壓漿材料 ；力學性能 ；流動度 ；膨脹率 ；微觀電鏡掃描

中圖分類號 ：TU528           

文獻標志碼 ：A            

文章編號 ：1005- 8249  (2023)   04- 0080- 05

DOI : 10. 19860/j . cnki. issn1005- 8249. 2023 . 04. 014

FAN Jielin

（Xinjiang Comprehensive Administrative Law Enforcement Bureau of Transportation ,   Urumqi 830000 ,  China  ) 

Abstract: To study the mechanical properties of mineral admixture to improve the pressure drop material of prestressed duct, a new type of duct grouting (FADG) material was prepared by using fly ash mineral admixture indoors. The fluidity test, uniaxial compression strength test, flexural strength test, expansion test and bleeding test of f FADG mortar materials with different curing ages were carried out, and the research was performed from the perspective of micro mechanism by micro electron microscope scanning test. It is found that: (1) fly ash mineral admixture can strengthen the fluidity of ordinary cement pore grouting materials. However, it has a very obvious deterioration effect on the early compressive strength and flexural strength of pore grouting materials. When the curing age was 28 days, the compressive strength and flexural strength increased first and sunsequently decreased; (2) The optimum proportion of fly ash in the new FADG material is 20%. At this time, its initial fluidity is 13.25 s, and its compressive strength and flexural strength are 78.88 MPa and 12.92 MPa respectively. At the same time, it will not produce bleeding and shrinkage. The internal structure of the curing molding material is dense and the comprehensive engineering performance is the best.

Keywords: fly ash, duct grouting material, mechanical properties, fluidity, expansion rate, microscopic scanning electron microscope

作者簡介 ：范志林  ( 1989—) ,   男 ，本科 ， 工程師 ，研究方 向 ：公路工程。

收稿日期 ：2022- 03-27