millenniumconcrete

TECHNOLOGTES (PVI)LTD, CONSULTANCY .STATE.OF.THE.ART

IECHNOLOGY , PROOUCTS SERVICES

The Project Manager24MW Jaffrra Diesal Power PlantLakdhanavi Limited67,Park StreetColombo 02

Dear Sir,

Re : Admixture Retardation

lotr luly 2012

We write with reference to your inquiry about the retardation of the concrete with Adcrete -Retarding Plasticizer.

The report SS 1202271issued by ITI only gives an indication about the comparative retardationof plain cement with and without admixtures. This values are based on the Vicat Apparatus testcarried out with OPC and the retarder under controlled laboratory conditions where thetemperature is 26Co .

The retardation of concrete or cement is mainly a function of ambient temperature, Setting timeof cement, water/cement ratio, Type and dosage of retarder and many more factors.

Even the retardation of the concrete is tested, this is only valid for that particular time of the day.This figure is varied during day and night time even with the same ingredient and the mix. Thechange in the setting time of cement and the cement temperature is another factor.

We are the expert in Sri Lanka for the concrete admixtures for over 20 years and MillenniumConcrete Technologies own more than 80% of the market currently. ln Sri Lanka, more than 4

million cubic meters of concrete have been produced with Adcrete

With our experience, we suggest that you should use around 425 ml of Adcrete for l00kg ofcement in your concrete mix for a retardation of 3.5hr to 4.5hr. Best option is to design for fewhours longer retardation than required in anticipation of the extremes of other parameters.

Thank youYours faithfullyMillennium Concrete Technologies (hrt) Ltd

Ravi NissankaDirector - Technical

llltlZA,sirBaronJayarhillakaMawarha,Pilapitiya,Kelaniya,sriLanka. Tel:+94114401234 p3;;+94112690206 Email:ravini@eureka.lk

PRt]FESSIt]NALS IN Ct]NSTRUCTION CHEMICAL APPLICATItlNS.

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