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2007•Journal of Yangtze River Scientific Research InstituteRequires access

Research on Retarder Available for Alkali Activated Carbonatite-Slag Cementitious Material

Wen Zi-yun

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Abstract

The effect of some chemical retarders,often used for alkali-activated cement such as Pb(NO3)2,Zn(NO3)2,and NaCl etc.,on the gelation time of alkali-activated carbonatite-slag cementitious material(AACSCM) was investigated.The results are as follows: Pb(NO3)2 or Zn(NO3)2 has retarding effect when its addition is not less than 3% of blast-furnace slag,and for NaCl or Na2B7O4 the addition should not be less than 8%;chemical reagent BS can efficiently retard the gelation of AACSCM paste and improve the strength of AACSCM mortars.In addition,the fluidity of AACSCM paste can be kept constantly for 4 hours.The retarding effect of BS is mainly attributed to the formation of a protective layer on the surface of slag grain due to the reaction between BS and water glass.

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The effect of some chemical retarders,often used for alkali-activated cement such as Pb(NO3)2,Zn(NO3)2,and NaCl etc.,on the gelation time of alkali-activated carbonatite-slag cementitious material(AACSCM) was investigated.The results are as follows: Pb(NO3)2 or Zn(NO3)2 has retarding effect when its addition is not less than 3% of blast-furnace slag,and for NaCl or Na2B7O4 the addition should not be less than 8%;chemical reagent BS can efficiently retard the gelation of AACSCM paste and improve the strength of AACSCM mortars.In addition,the fluidity of AACSCM paste can be kept constantly for 4 hours.The retarding effect of BS is mainly attributed to the formation of a protective layer on the surface of slag grain due to the reaction between BS and water glass.

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Available abstract

The effect of some chemical retarders,often used for alkali-activated cement such as Pb(NO3)2,Zn(NO3)2,and NaCl etc.,on the gelation time of alkali-activated carbonatite-slag cementitious material(AACSCM) was investigated.The results are as follows: Pb(NO3)2 or Zn(NO3)2 has retarding effect when its addition is not less than 3% of blast-furnace slag,and for NaCl or Na2B7O4 the addition should not be less than 8%;chemical reagent BS can efficiently retard the gelation of AACSCM paste and improve the strength of AACSCM mortars.In addition,the fluidity of AACSCM paste can be kept constantly for 4 hours.The retarding effect of BS is mainly attributed to the formation of a protective layer on the surface of slag grain due to the reaction between BS and water glass.

Key concepts: Cementitious, Retarder, Ground granulated blast-furnace slag, Mortar, Materials science, Cement, Slag (welding), Alkali metal

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