鄧俊雙1,徐志華1,李北星2,李 龍2
鄧俊雙,徐志華,李北星,等.低溫環境下石灰巖機制砂砂漿抗硫酸鹽侵蝕性能研究[J].混凝土與水泥制品,2022(1):22-26.
DENG J S,XU Z H,LI B X,et al.Sulfate Resistance of Limestone Manufactured Sand Mortar in Low Temperature Environment[J].China Concrete and Cement Products,2022(1):2022(1):22-26.
低溫環境下石灰巖機制砂砂漿抗硫酸鹽侵蝕性能研究
鄧俊雙1,徐志華1,李北星2,李 龍2
鄧俊雙,徐志華,李北星,等.低溫環境下石灰巖機制砂砂漿抗硫酸鹽侵蝕性能研究[J].混凝土與水泥制品,2022(1):22-26.
DENG J S,XU Z H,LI B X,et al.Sulfate Resistance of Limestone Manufactured Sand Mortar in Low Temperature Environment[J].China Concrete and Cement Products,2022(1):2022(1):22-26.
摘 要:為研究低溫環境下石灰巖機制砂及石粉對混凝土抗硫酸鹽侵蝕性能的影響,以摻/未摻石灰巖石粉的機制砂砂漿、摻/未摻石灰巖石粉的天然砂砂漿為模擬對象,結合硫酸鹽腐蝕介質及低溫環境特點,采用溫度(5±1)℃的5%的MgSO4溶液模擬服役環境,對比研究了不同腐蝕齡期(0 d、60 d、90 d、210 d、270 d、360 d)試件的外觀和強度變化,并基于XRD、FTIR測試分析了侵蝕產物。結果表明:隨著齡期的增長,侵蝕方式由傳統的鈣礬石型硫酸鹽侵蝕逐漸過渡到以碳硫硅酸鈣為侵蝕產物的TSA巖侵蝕;石灰巖機制砂和石粉均能促使砂漿產生TSA侵蝕,且石粉的影響更加明顯。
Abstract: In order to study the influence of limestone manufactured sand and limestone rock fines on the sulfate resistance of concrete under low temperature environment, the two kinds of manufactured sand mortars mixed with or without limestone rock fines, and the two kinds of natural sand mortars incorporated with or without limestone rock fines were used as the simulate objects. Combined with the characteristics of sulfate corrosion medium and low temperature environment, 5% magnesium sulfate solution at (5±1)℃ was used to simulate the service environment. The changes of appearance and strength for the mortar specimens at different corrosion ages (0 d, 60 d, 90 d, 210 d, 270 d, 360 d) were compared and studied, and the corrosion products were analyzed by X-ray diffraction (XRD) and fourier transform infrared spectroscopy (FTIR). The results show that with the increase of erosion age, the erosion mode gradually transits from traditional ettringite type sulfate attack to thaumasite sulfate attack (TSA) with thaumasite as the erosion product. Limestone manufactured sand and limestone rock fines all can promote the TSA of mortar and concrete, and the effect of limestone rock fines is more obvious.
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