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sdec SEFI Regulars
Joined: 26 Jan 2003 Posts: 26
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Posted: Fri Dec 29, 2006 7:44 am Post subject: Early Heat of Hydration |
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Dear friends We have a raft of thickness ranging from 1.1m to 2.0m for a project and the steel reqd normally is in the range of 16[AT]150... .However, if we check for min steel reqd to withstand the early heat of hydration, using the Relevant BS Code formula, we need atleast 16[AT]80c.../c.I can give more details if it is required to explain my problem further. Pl let me know if there is an admixture which can reduce the early heat of hydration so that we dont need to double the steel provided will really appreciate an early response Regards and a Very Happy, healthy and Peaceful 2007 Sangeeta Wij
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sidhudaljeet ...
Joined: 26 Jan 2003 Posts: 110
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Posted: Fri Dec 29, 2006 5:36 pm Post subject: Early Heat of Hydration |
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Dear Sangeeta ji
I think the PPC cements have comparative low heat of hydration. Grasim Cements claims its Grasim Super as low heat of hydration cement. For admixtures you will have to be very careful, its use should be in strict supervision slight dose variations has unexpected results. Daljeet
sdec.in[AT]gma... wrote: Dear friends We have a raft of thickness ranging from 1.1m to 2.0m for a project and the steel reqd normally is in the range of 16[AT]150... .However, if we check for min steel reqd to withstand the early heat of hydration, using the Relevant BS Code formula, we need atleast 16[AT]80c.../c.I can give more details if it is required to explain my problem further. Pl let me know if there is an admixture which can reduce the early heat of hydration so that we dont need to double the steel provided will really appreciate an early response Regards and a Very Happy, healthy and Peaceful 2007 Sangeeta Wij
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Jayant Lakhlani General Sponsor
Joined: 26 Jan 2003 Posts: 192
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Posted: Sat Dec 30, 2006 4:12 am Post subject: Early Heat of Hydration |
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Dear Sangeeta,
For construction of Narmada dam, for thick and massive concrete sections, ice was used instead of water in cocrete batching plant. Logic was to compensate the heat of hydration by lower temperature of the ice.
I think this can work for your problem too.
Regards.
-Jayant Lakhlani
sidhudaljeet[AT]yah... wrote: Dear Sangeeta ji
I think the PPC cements have comparative low heat of hydration. Grasim Cements claims its Grasim Super as low heat of hydration cement. For admixtures you will have to be very careful, its use should be in strict supervision slight dose variations has unexpected results. Daljeet
sdec.in[AT]gma... wrote: Dear friends We have a raft of thickness ranging from 1.1m to 2.0m for a project and the steel reqd normally is in the range of 16[AT]150... .However, if we check for min steel reqd to withstand the early heat of hydration, using the Relevant BS Code formula, we need atleast 16[AT]80c.../c.I can give more details if it is required to explain my problem further. Pl let me know if there is an admixture which can reduce the early heat of hydration so that we dont need to double the steel provided will really appreciate an early response Regards and a Very Happy, healthy and Peaceful 2007 Sangeeta Wij
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tnshreesh SEFI Member
Joined: 26 Jan 2003 Posts: 11
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Posted: Sat Dec 30, 2006 6:05 pm Post subject: Early Heat of Hydration |
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Dear sangeetha If the placing temeprature of concrete shall be around 25 deg which can take care early heat of hydration.
shreesh
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