Adaptation of the standard EN 196-1 for mortar with accelerator

In certain applications, accelerators are added to favour a rapid evolution of mechanical properties in mortar and concrete. In order to assure adequate performance, it is necessary to test the compatibility between the accelerator and other components of the mixture. The EN 934-5 establishes that such evaluation of accelerators should be performed according with the procedure established in the EN 196-1. However, this standard does not take into account the inclusion of the accelerators or the particularities of the mortar produced with these admixtures. The objective of this paper is to adapt the EN 196-1 in order to characterize the strength of mortars with accelerator. First, an experimental parametric study to evaluate the influence of the production procedure on the results was conducted. Based on the results obtained, a modified production process was proposed. Then, a wide experimental program including a total of 40 mixes of mortars with different formulations and contents of accelerators was performed. Based on a statistical analysis, a new admissible variation used to calculate the compressive strength was proposed.

[1]  H. Darweesh.  Limestone as an accelerator and filler in limestone-substituted alumina cement , 2004 .

[2]  S. Cavalaro,et al.  Influence of spraying on the early hydration of accelerated cement pastes , 2016 .

[3]  P. K. Mehta,et al.  Concrete: Microstructure, Properties, and Materials , 2005 .

[4]  Ross Dimmock.  SPRAYED CONCRETE - ADVANCED TECHNOLOGIES , 2003 .

[5]  Sprayed Concrete Technology , 2002 .

[6]  I. Galobardes,et al.  Estimation of the modulus of elasticity for sprayed concrete , 2014 .

[7]  Christian U. Grosse,et al.  Ultrasound monitoring of the influence of different accelerating admixtures and cement types for shotcrete on setting and hardening behaviour , 2005 .

[8]  Isaac Galobardes Reyes.  Estudio relativo a la caracterización de aditivos acelerantes para hormigón proyectado por vía húmeda , 2009 .

[9]  G. Batis,et al.  An analysis of the properties of Portland limestone cements and concrete , 2002 .

[10]  S. Diamond.  Concrete admixtures handbook: V.S. Ramachandran, editor. Noyes Publications, Park Ridge, NJ 07656. 1984. (cloth $84.00) , 1986 .

[11]  Isaac Galobardes Reyes,et al.  Characterization and control of wet-mix sprayed concrete with accelerators , 2013 .

[12]  Venčeslav Kaučič,et al.  The effects of limestone addition, clinker type and fineness on properties of Portland cement , 2001 .

[13]  Antonio Domingues de Figueiredo,et al.  Early age hydration of cement pastes with alkaline and alkali-free accelerators for sprayed concrete , 2016 .

[14]  Miguel Angel Sanjuán Barbudo.  Los cementos de adición en España del año 2000 al 2005 , 2007 .

[15]  V. S. Ramachandran,et al.  Concrete Admixtures Handbook: Properties, Science and Technology , 1996 .

[16]  Xiong Zhang,et al.  Research on effect of limestone and gypsum on C3A, C3S and PC clinker system , 2008 .

[17]  Chris I. Goodier,et al.  Maturity method to predict the evolution of the properties of sprayed concrete , 2015 .

[18]  T. Dinoia,et al.  Alkali-free shotcrete accelerator interactions with cement and admixtures , 2004 .

[19]  Des Relf.  Frames for the future : University College London Hospital , 2003 .

[20]  S. Cavalaro,et al.  Parameters controlling early age hydration of cement pastes containing accelerators for sprayed concrete , 2016 .

[21]  T. A. Melbye,et al.  Modern advances and applications of sprayed concrete , 2020 .

[22]  Simon A. Austin,et al.  Sprayed Concrete: Properties, Design and Application , 1995 .