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（西安理工大學(xué)土木建筑工程學(xué)院， 西安 710048）

［摘要］針對(duì)青海鹽湖地區(qū)混凝土結(jié)構(gòu)遭受氯鹽的侵蝕破壞的情況，采用長(zhǎng)期浸泡法研究了水泥基灌漿料在不同濃度（10%,15%,20%）NaCl溶液下的抗氯離子侵蝕力學(xué)性能，從強(qiáng)度耐蝕系數(shù)（抗折耐蝕系數(shù)、抗壓耐蝕系數(shù)）及氯離子侵蝕深度兩方面對(duì)水泥基灌漿料抗氯離子侵蝕性能進(jìn)行了分析研究。試驗(yàn)結(jié)果表明，在相同濃度的NaCl鹽溶液及水泥基灌漿料配合比下，水泥基灌漿料試件隨著浸泡時(shí)間的增長(zhǎng)，其抗折耐蝕系數(shù)和抗壓耐蝕系數(shù)呈現(xiàn)出先緩慢增大后大幅度降低的趨勢(shì)；隨著NaCl鹽溶液濃度的增加，浸泡9個(gè)月的水泥基灌漿料的抗壓耐蝕系數(shù)降低了4-1%；水泥基灌漿料試件的氯離子侵蝕深度隨浸泡時(shí)間的增加而增加，浸泡至9個(gè)月后，氯離子侵蝕速率減緩趨于穩(wěn)定，試件氯離子侵蝕深度的增長(zhǎng)率僅為2-6%。在此基礎(chǔ)上，對(duì)抗氯離子侵蝕性能最好的NJ3試件在15%NaCl溶液下進(jìn)行凍融循環(huán)試驗(yàn)，結(jié)果表明，隨著凍融循環(huán)次數(shù)的增加，NJ3試件的氯離子侵蝕深度逐漸增加，在75次凍融循環(huán)后，氯離子侵蝕深度的增長(zhǎng)速率有所降低，200次凍融循環(huán)試驗(yàn)之后，NJ3試件的氯離子侵蝕深度為4-35mm。

［關(guān)鍵詞］水泥基灌漿料； 氯離子侵蝕； 力學(xué)性能； 耐蝕系數(shù)； 侵蝕深度

中圖分類(lèi)號(hào)：TU525文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2019)21-0108-06

Experimental study on mechanical properties of cement-based grouting material under chloridion corrosion

Kou Jialiang, Yu Danhong, Zhang Haobo

(School of Civil engineering & Architecture, Xi′an University of Technology, Xi′an 710048, China)

Abstract:In view of the corrosion damage of concrete structure in the Qinghai Salt Lake area, the long-term immersion method was used to study the chloridion corrosion resistance of cement-based grouting material in NaCl solutions with different concentrations (10%, 15% or 20%). Chloridion corrosion resistance performance of cement-based grouting material was analyzed in two perspectives of the strength corrosion resistance coefficient (flexural corrosion resistance coefficient and compressive corrosion resistance coefficient) and the chloridion corrosion depth. The experimental results show that under the same NaCl salt solution concentration and cement-based grouting material mix proportion, the flexural corrosion resistance coefficient and compressive corrosion resistance coefficient of cement-based grouting material specimens show a trend of slowly increasing first and then decreasing sharply with the increase of soaking time. With the increase of the concentration of NaCl salt solution, the compressive corrosion resistance coefficient of cement-based grouting material immersed for 9 months decreases by 4-1%.  The chloridion corrosion depth of cement-based grouting material specimens increased with the increase of soaking time,  the rate of chloridion corrosion slows down to be stable and the growth rate of chloridion corrosion depth of the specimens is only 2-6% after soaked for 9 months. On this basis, the NJ3 specimen with the best resistance to chloridion corrosion was subjected to freeze-thaw cycle test under 15% NaCl solution. The results show that the chloridion corrosion depth of NJ3 specimens increases gradually with the increase of the number of freeze-thaw cycles. After 75 freeze-thaw cycles, the growth rate of chloridion corrosion depth decreases. After 200 freeze-thaw cycles, the chloridion corrosion depth of the NJ3 specimen is 4-35 mm.

Keywords:cement-based grouting material; chloridion corrosion; mechanical property; corrosion resistance coefficient; corrosion depth

作者簡(jiǎn)介：寇佳亮，博士，副教授，Email：jialiangkou0918@163.com。