Experimental Study on Permeability and Mechanical Properties of Nano - Modified Porous Concrete

摘要

The porosity of porous concrete (PC) is an important parameter used for both mechanicalproperties of pavement and environmental design. Nanoparticles have received increasingattention and have been utilized in various fields such as concrete to develop novel materialswith interesting functions, all because of dedicated physical and chemical properties ofnanoparticles. This paper describes new findings of an experimental work on mechanicalproperties and permeability of porous concrete containing Nano-SiO2 (PCNS). Plain porousconcrete (PPC) and porous concrete containing Micro-SiO2 (PCMS) have been studied ascontrol materials. 28 day PCNS results showed higher compressive and flexural strengthscomparing to those of PPC with the same water–cement ratio (w/c). It was demonstrated thatthe Nano-SiO2 (NS) was more effective than Micro-SiO2 (MS) in enhancing PC flexuralstrength. Samples with 5% NS by weight of binder presented the highest mechanicalproperties where the flexural and compressive strength of PC were enhanced by 56% and48%, respectively. Having experimentally studied the permeability behavior of PCNS andPCMS, it appeared that NS and MS could both reduce water penetration through PC;however, MS was found more effective for equal nanoparticles and material voids.