Enhancement of Reactive Powder Concrete via Nanocement Integration

Abstract

Reactive powder concretes (RPCs) were developed through careful design and control of the composite microstructure. Enhanced properties were achieved through optimization of the gradation and arrangement of the inert particles, as well as through designing the reactive components (e.g., coarse-ground oil-well cement and silica fume) to govern the hydration product morphology. Recently, a process has been developed for synthesis of cement with nanometer-scale particle sizes with tailorable chemical compositions. The addition of nanocements to RPCs is unique because it influences the early hydration reaction of the cement in RPC for nano-sized hydration products. The replacement of a small fraction of the conventional cement with these nano-sized reactive particles reduces the induction period in cement hydration and initiates a faster conversion to the hydration products. Integration of nanocements may also lead to a denser product microstructure with higher ultimate compressive and tensile strengths. Potential also exists to reduce the permeability of the RPC and to strengthen the interfacial transition zones within the material. With such improvements, nanocement can serve as a means to optimize RPC systems for enhanced properties and may further enhance the durability of RPC.

Investigation on Properties of Reactive Powder Concrete with Automobile Grinding Steel Waste as Fine Aggregate

“…On the other hand use of nano cement as an additive has been very advantageous in producing this high strength concrete. It enhanced the hydration process by seeding the enhancement of ions for the hydration products [6].In order to reduce the cement content high volume of about 60% of class C fly ash and using ultra-fine mineral admixtures was used as the binding material in RPC [2] [7]. Apart from these basic ingredients fibres play a major role in enhancing the flexural toughness of the RPC.…”

Heat-resistant properties of construction composites based on nanocarbon cement (nCMC)

“…The materials from which the building structures are made are exposed to high temperatures and undergo various changes. These changes are accompanied by characteristic signs, which are expressed in the form of transformation of physical, chemical and mechanical properties of substances and materials, in the development of deformation, destruction or complete destruction of parts of the building [1][2][3][4][5].…”

Properties of Chemically Combusted Calcium Carbide Residue and Its Influence on Cement Properties

“…The purpose of this research is to recycle CCR waste by investigating the possibility of using it (in place of limestone) as a calcium oxide source for the production of clinker. The CCR is recycled by synthesizing it to a reactive cemetitious powder through a new combustion technique developed and patented in references [ 16 , 17 ]. This combustion approach is based on producing a clinker that contains a mixture of raw materials (which includes limestone, clay, and aluminum nitrate, etc. )…”