Internal curing of high performance mortars with bottom ash

An overview on the effect of internal curing on shrinkage of high performance cement-based materials

“…Low water absorption capacity mainly by physical capillary force, and it has nm-size pores RHA [30,38] acid leaching residue of boron mud [39] bottom ash [14] Partly replace silica fume [30]…”

“…Small particle size materials with large specific surface area, mesoporous structure and absorbing ability of the aqueous phase mainly characterize porous superfine powders, and absorbed water of porous superfine powders supplies for further hydration of cementitious materials. It includes RHA [30,38]，acid leaching residue of boron mud [39], and bottom ash [14], and the main properties of porous superfine powers is shown in Table 2. The use of porous superfine powders can delay and slow down the decrease of the internal RH (self-desiccation) of UHPC, hence strongly mitigating its autogenous shrinkage [30,38], and RHA is the most commonly used.…”

“…Porous superfine powder has a good effect on mitigating autogenous shrinkage [13,14,30,39,55]. As in the case of RHA [30,39], boron mud acid leaching slag [39] can reduce autogenous shrinkage.…”

“…Rice husk ash (RHA) has been used as an internal curing material for UHPC in recently years [13]. In addition, people have also found several other internal curing materials, such as bottom ash [14] and cenospheres [15]. Internal curing was firstly defined in ACI 308-2001 [16].…”

Tratamiento superficial con nanopartículas base silicio inducido durante el curado: Efecto en la durabilidad de materiales base cemento portland

“…El gradiente de humedad que se genera promueve el movimiento de agua hacia el interior, aunado a la absorción que origina la porosidad de la matriz del concreto. Esta técnica no es nueva, pero permite la hidratación, de tal forma que maximiza las propiedades potenciales que se pueden desarrollar en una matriz base cemento portland (Kong et al, 2016;Kupwade-Patil et al, 2016;Wyrzykowski et al, 2016). Sin embargo, un proceso inadecuado de curado (o la ausencia) del concreto pueden dar lugar a una porosidad elevada, especialmente en la superficie externa del concreto.…”