Study on sulfate resistance of CaFe-LDHS admixtures to concrete test blocks under dry and wet cycle
CaFe-LDHs was prepared by chemical co-precipitation,and CaFe-LDHs was employed for sulphate adsorption and anti-sul-phate erosion research on concrete specimen blocks.The adsorption experiments showed that the adsorption process of sulphate by CaFe-LDHs was in accordance with the pseudo-first-order kinetic model and Langmuir model,which suggested that CaFe-LDHs exhibited better adsorption properties for sulphate.In the sulphate erosion resistance experiments showed that the compressive strength of concrete specimens increased with the increasing dosage of CaFe-LDHs.Whereas,the compressive strength of concrete specimens increased and then decreased with the number of drying-wetting cycles.The sulphate depth distribution curve showed that with the increase of admixture could effectively retard the sulfate erosion on concrete specimens,and indicated that CaFe-LDHs as an admixture could significantly re-duce the sulfate erosion on concrete specimens.
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