Effect of Nanoscale Deep Penetration Sealer Materials or Concrete Properties

摘要

A layer of deep penetration sealer materials (DPSMs), such as concrete, is usually used on the surface of plastic materials to prolong service life. In this paper, the crystallization mechanism of nanoscale DPSMs (NDPSMs) in concrete penetration was studied. Analysis results show thatC–S–H gel and calcium carbonate are the main hydration products of the reaction of NDPSMs with calcium ions in concrete. The microstructure of acicular crystals was observed by scanning electron microscopy. These crystals penetrated into the concrete surface and filled the internalcapillary pores of the mortar substrate, thus reducing porosity and improving the compactness of the concrete surface layer. The crystals can also protect the concrete structure. Results demonstrated that concrete sprayed with NDPSMs has higher drawing force and pressure resistance than commonconcrete. Furthermore, NDPSMs can also repair some cracks. The pressure resistance of concrete with low strength grades can be improved significantly. NDPSMs can increase the compactness and anti-abrasion strength of the concrete surface and reduce water absorption. Thus, NDPSMs are conducivefor improving the comprehensive endurance quality of concrete.