A Study of Crystalline Mechanism of Penetration Sealer Materials

Materials

Li-Wei Teng²  Ran Huang²  Jie Chen¹  An Cheng¹ 

[1] Department of Civil Engineering, National Ilan University, No. 1, Sec. 1, Shen-Lung Road, I-Lan 26047, Taiwan; E-Mails:;Department of Harbor and River Engineering, National Taiwan Ocean University, No. 2 Pei-Ning Road, Keelung 20224, Taiwan; E-Mails:

关键词: crystalline penetration sealer materials (CPSM);    waterproof;    C-S-H gel;    water permeability;    rapid chloride permeability test (RCPT);    mercury intrusion porosimetry (MIP);    X-ray diffraction (XRD);    scanning electron microscope (SEM);    fourier transform infrared spectroscopy (FT-IR);    thermogravimetric analyzer (TGA);   

DOI  :  10.3390/ma7010399

来源: mdpi

【 摘 要 】

It is quite common to dispense a topping material like crystalline penetration sealer materials (CPSM) onto the surface of a plastic substance such as concrete to extend its service life span by surface protections from outside breakthrough. The CPSM can penetrate into the existing pores or possible cracks in such a way that it may form crystals to block the potential paths which provide breakthrough for any unknown materials. This study investigated the crystalline mechanism formed in the part of concrete penetrated by the CPSM. We analyzed the chemical composites, in order to identify the mechanism of CPSM and to evaluate the penetrated depth. As shown in the results, SEM observes the acicular-structured crystals filling capillary pores for mortar substrate of the internal microstructure beneath the concrete surface; meanwhile, XRD and FT-IR showed the main hydration products of CPSM to be C-S-H gel and CaCO₃. Besides, MIP also shows CPSM with the ability to clog capillary pores of mortar substrate; thus, it reduces porosity, and appears to benefit in sealing pores or cracks. The depth of CPSM penetration capability indicated by TGA shows 0–10 mm of sealer layer beneath the concrete surface.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland