文章信息/Info

Title:

Research on Sulfate Resistance of Concrete

作者:

謝智剛12; 王起才12; 代金鵬12; 王振宇12; 梁柯鑫12; 田祥富1

（1. 蘭州交通大學 道橋工程災害防治技術國家地方聯合工程實驗室，甘肅 蘭州 730070）（2. 蘭州交通大學 甘肅省道路橋梁與地下工程重點實驗室，甘肅 蘭州 730070）

Author(s):

XIE Zhigang12; WANG Qicai12; DAI Jinpeng12; WANG Zhenyu12; LIANG Kexin12; TIAN Xiangfu1

(1. Bridge Engineering National Local Joint Engineering Laboratory of Disaster Prevention and Control Technology,Lanzhou Jiaotong University, Lanzhou 730070, China)（2. Key Laboratory of Road and Bridge and Underground Engineering of Gansu Province,Lanzhou Jiaotong University, Lanzhou 730070, China)

關鍵詞:

混凝土劣化; 硫酸鹽侵蝕; 抗蝕系數; 相對動彈性模量; 連通孔隙率

Keywords:

concrete deterioration;  sulfate attack;  resistance coefficient;  relative elastic modulus;  connected porosity

DOI:

10.7502/j.issn.1674-3962.2018.11.08

文獻標志碼:

A

摘要:

研究了不同水膠比混凝土試件在（20±2）℃全浸泡作用下的抗硫酸鹽侵蝕性能。試驗制備0.32與0.36兩種水膠比的普通硅酸鹽水泥、高抗硫水泥以及復摻礦粉和硅灰的混凝土試件，檢測了試件標養28 d后的抗壓強度、動彈性模量及各試件在（20±2）℃、質量分數為3%Na2SO4溶液中全浸泡侵蝕的強度、動彈性模量變化情況，對混凝土在（20±2）℃全浸泡侵蝕下的抗硫酸鹽侵蝕性能進行了評價。結果表明，在（20±2）℃全浸泡作用下，0.36水膠比混凝土抗硫酸鹽侵蝕性能低于0.32水膠比混凝土，抗硫酸鹽侵蝕性能隨著水膠比的降低而提高；混凝土復摻礦粉和硅灰后抗硫酸鹽侵蝕性能較好；高抗硫水泥通過限制C3A的含量，進而改善混凝土抗硫酸鹽侵蝕性能，不一定在任何環境下都適用；混凝土連通孔隙率從側面證實了低水膠比混凝土和復摻礦粉和硅灰混凝土抗壓侵蝕系數和相對動彈性模量較高，說明低水膠比混凝土復摻礦粉和硅灰后，可以顯著提高混凝土抗硫酸鹽侵蝕性能。

Abstract:

The effects of different water-cement ratio cement mortar on the sulfate resistance under full immersion were studied. Ordinary Portland cement, high sulfur-resistant cement and slag with silica fume cement concrete samples were prepared with water-cement ratio of 0.32 and 0.36. After standard curing for 28 days, compressive strength and relative elastic modulus were examined. Concrete samples were fully immersed in 3wt% Na2SO4 sulfate solution at （20±2）℃, and their strength and elastic modulus were measured. Then the corrosion resistance of the concrete under full immersion was evaluated. The results show that under the condition of full immersion, the corrosion resistance of 0.36 water-cement ratio is lower than that of 0.32 water-cement sample, and the resistance to sulfate attack increases with the decrease of water-cement ratio. Concrete was mixed with mineral powder-silica fume after full immersion conditions to enhance the performance of sulfate erosion significantly. High sulfur-resistant cement can improve the performance of concrete sulfate attack by limiting the content of C3A, which is not necessarily applicable in any environment. The resistance coefficient and relative elastic modulus of low-water-cement concrete and concrete mixed with mineral powder-silica are higher, which is confirmed by connected porosity, further showing low-water-cement concrete mixed with mineral powder-silica can significantly improve the performance of concrete resistance to sulfate attack.