Study on Seawater Erosion Resistance of Cement-Based Silica Grouting Material
To study the seawater erosion resistance of cement-based silica grouting material,an artifi-cial seawater solution was prepared based on the hydrochemical analysis of seawater near the project site.The solution was used to immerse and cure the grouted stone samples.Tests on compressive strength,L-NMR,XRD,FTIR,and FT-IR,and SEM,were conducted on specimens at different ages to reveal the changes in erosion resistance over time.The results indicate that the corrosion resis-tance of the material initially increased and then decreased with prolonged exposure.In the early stages of erosion,the"filling effect"of erosion products and the"salt excitation"effect of erosion ions opti-mized the pore size distribution of the grouted stone,with the maximum erosion resistance K observed at 7 days.The K values for water-cement ratios of 0.7,1.0 and 1.5 were 1.26,1.23 and 1.18,respec-tively,before gradually decreasing.After 60 days,erosion products like Aft and Friedel's salt compro-mised the hardened grout structure,causing small pores to transform into larger ones,resulting in a K value less than 1.0.At a water-cement ratio of 1.5,the K value at 180 days was only 0.45.Under the same erosion conditions,the erosion resistance varied with different water-cement ratios,with lower ratios exhibiting stronger resistance.Therefore,when CIS is used for grouting in coastal regions,it is recommended to minimize the water-cement ratio while ensuring the injectability of the grout.
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