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研究了矿渣混凝土在5%Na2SO4溶液中浸烘循环,其相对动弹性模量、幅值及抗压强度演化规律.试验结果表明:混凝土相对动弹性模量先下降,后上升,再保持稳定,最后下降直至破坏;其幅值在前100次保持稳定,后下降直至破坏.混凝土抗硫酸盐腐蚀能力随矿渣掺量的增加而增加.相比于普通混凝土,随矿渣掺量增加,混凝土抗压强度损失率下降了28%～62%.混凝土在硫酸盐溶液中浸烘循环,其腐蚀产物为钙矾石和石膏.膨胀性腐蚀产物导致了混凝土浆集界面区和浆体区开裂,并最终导致混凝土破坏.
The relative dynamic elastic modulus, amplitude and compressive strength evolution of slag concrete during immersion drying in 5% Na2SO4 solution were studied.The experimental results show that the relative dynamic elastic modulus of concrete first decreases, then rises and then remains stable, And finally descended until destructed.The amplitude of the concrete remained stable in the first 100 times and then descended until it was destroyed.The resistance to sulfate corrosion of concrete increased with the increase of slag content.Compared with normal concrete, with the increase of slag content, Strength loss rate decreased by 28% ~ 62% .Concrete immersed in the sulfate solution cycle, the corrosion products of ettringite and gypsum.Dissolved corrosion products led to the concrete slurry set interface and the slurry zone cracking, and eventually lead to Concrete damage.