The effect of targeted enhanced components on the working performance,mechanical properties and micromorphology of NAC-PHC(Non-autoclaved PHC)pile concrete were studied through experiment.The results show that when the dosage of cementing material is 430 kg/m3,the dosage of polycarboxylic acid superplasticizer is 1.8％,the dosage of mineral powder is 30％,the water-binder ratio is 0.26,the sand rate is 38％,and the targeted reinforced component is composed of the early strength enhancement component sodium thiocyanate and triethanolamine,crystal karyo type reinforced component C-S-H nanocrystalline nucleus and dense reinforced component sodium methylsilicate,the 7 d compressive strength of the prepared non-autoclaved PHC pile concrete can reach 94.3 MPa and the durability is significantly enhanced.XRD analysis shows that the hydration products of NAC-PHC pile concrete are basically similar to those of the autoclaved PHC pile concrete.SEM analysis shows that NAC-PHC pile concrete microstructure is more compact.
维普
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