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Hot Weather Concreting of Mass Concrete

 
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coolestbliss
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PostPosted: Thu Jul 01, 2010 7:26 am    Post subject: Hot Weather Concreting of Mass Concrete Reply with quote

We are in the early planning stage for a large concrete pour during hot summer weather in Middle East (single continuous concreting / pouring for a massive raft foundations 50m x 50m on plan and 5m thick (Total volume: 12500 m).
The single concreting operation is estimated to continue for 48 hours. The shaded ambient air temperature is expected to reach 46 to 50 Celsius in the afternoon and approximately 30 Celsius during night. The laboratory measured absolute maximum concrete hydration temperature (for C60) is expected to reach 80 Celsius. The relative humidity is very low.
We are concern about the high shaded ambient air and maximum concrete hydration temperature.
Questions:-
If the freshly pour concrete is
a) properly cured and covered to minimized loss of moisture, and
b) all surfaces are properly insulated so that the maximum temperature difference between the outer surface and inner core of the 5m thick raft is maintained below 15 Celsius,
in this case, would the
(a) high ambient temperature (50 Celsius) and
(b) High concrete hydration temperature (80 Celsius) will have any unfavorable effects / cause potential deficiencies to concrete in the hardened state strength and durability?
(c)-Please guide me about the availability of low heat cement in Saudi Arabia and worldwide and its price difference.
(d)-What will be the effects if cooling is done by chilled water pipes.
(e)-What will be the effect of concreting under shading during day time?
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suraj
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PostPosted: Thu Jul 01, 2010 5:37 pm    Post subject: Raft Pour Reply with quote

Raft Pour
It is a critical case of pouring.
Please, provide concrete plan to understand your intension.
How many batchers?
How many pumps?
How many pump locations?
Sequences of pouring?
How many differential thermometers?
Wet curing is out of question. Thermal curing would assist.
Concrete pause arrangements?
How many concrete layers & numbers on them?
Regards

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IntPE(India)Suraj Singh FIE Civil
Engineering & Arbitration

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Dr. N. Subramanian
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PostPosted: Thu Jul 01, 2010 6:00 pm    Post subject: Re: Hot Weather Concreting of Mass Concrete Reply with quote

Dear Er. ?

Hope the enclosed papers will be of help to you. You may also look into ACI Committee 305, Hot Weather Concreting (ACI 305R-99),. American Concrete Institute, Farmington Hills, MI, 1999, 20 pp.

Best wishes
NS
coolestbliss wrote:
We are in the early planning stage for a large concrete pour during hot summer weather in Middle East (single continuous concreting / pouring for a massive raft foundations 50m x 50m on plan and 5m thick (Total volume: 12500 m).
The single concreting operation is estimated to continue for 48 hours. The shaded ambient air temperature is expected to reach 46 to 50 Celsius in the afternoon and approximately 30 Celsius during night. The laboratory measured absolute maximum concrete hydration temperature (for C60) is expected to reach 80 Celsius. The relative humidity is very low.
We are concern about the high shaded ambient air and maximum concrete hydration temperature.
Questions:-
If the freshly pour concrete is
a) properly cured and covered to minimized loss of moisture, and
b) all surfaces are properly insulated so that the maximum temperature difference between the outer surface and inner core of the 5m thick raft is maintained below 15 Celsius,
in this case, would the
(a) high ambient temperature (50 Celsius) and
(b) High concrete hydration temperature (80 Celsius) will have any unfavorable effects / cause potential deficiencies to concrete in the hardened state strength and durability?
(c)-Please guide me about the availability of low heat cement in Saudi Arabia and worldwide and its price difference.
(d)-What will be the effects if cooling is done by chilled water pipes.
(e)-What will be the effect of concreting under shading during day time?



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suraj
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PostPosted: Fri Jul 02, 2010 5:37 pm    Post subject: Suggestive plan Reply with quote

Suggestive plan
Set strip sequences following the initial suggestions.
100 strips



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sspawar
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PostPosted: Wed Jul 07, 2010 6:28 am    Post subject: Re: Hot Weather Concreting of Mass Concrete Reply with quote

Dear Mr. Cool-- and all,

Here a JPG File  of 33 slides, is enclosed, which reveals a very relevant and latest information regarding Mass Concrete and Temperature Control.

It may help you and to others a lot and you may get answers of your all questions.

Regards


coolestbliss wrote:
We are in the early planning stage for a large concrete pour during hot summer weather in Middle East (single continuous concreting / pouring for a massive raft foundations 50m x 50m on plan and 5m thick (Total volume: 12500 m).
The single concreting operation is estimated to continue for 48 hours. The shaded ambient air temperature is expected to reach 46 to 50 Celsius in the afternoon and approximately 30 Celsius during night. The laboratory measured absolute maximum concrete hydration temperature (for C60) is expected to reach 80 Celsius. The relative humidity is very low.
We are concern about the high shaded ambient air and maximum concrete hydration temperature.
Questions:-
If the freshly pour concrete is
a) properly cured and covered to minimized loss of moisture, and
b) all surfaces are properly insulated so that the maximum temperature difference between the outer surface and inner core of the 5m thick raft is maintained below 15 Celsius,
in this case, would the
(a) high ambient temperature (50 Celsius) and
(b) High concrete hydration temperature (80 Celsius) will have any unfavorable effects / cause potential deficiencies to concrete in the hardened state strength and durability?
(c)-Please guide me about the availability of low heat cement in Saudi Arabia and worldwide and its price difference.
(d)-What will be the effects if cooling is done by chilled water pipes.
(e)-What will be the effect of concreting under shading during day time?



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suraj
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PostPosted: Wed Jul 07, 2010 3:33 pm    Post subject: Concrete References Reply with quote

<A>Concrete References


Thanks to Eng S S Pawar sahib for providing good references from Value Engineered project. It is informative one.

Just intend to clarify about the term used by the Value Engineer as 'Mass Concrete' may not be suitable in real terminology of concrete elements.

Once I used this term for certain major pour in 1999 in method statement while, a question mark was raised by the US client incharge & correct term Massive concrete was used. This is just for information.

Thin element / Thick element/ Massive blocks & mass concrete are varying terms.

Thick element means least dimension  of element 800 mm or more.
Upto 8 cum of RCC is ordinary thick member.

Massive concrete block is a major mass of concrete of any quantity where all dimensions are more than 800 mm

Sensors or differential thermometers are often utilised as mentioned for temperature observations at various volume locations.

Insulations are of course, provided around for not allowing heat of evoporation to escape & thus thermal curing is effected where concrete is in no direct contact with water.

Cooling has to be meaintained for concrete block until curing period is over.
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vikram.jeet
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PostPosted: Fri Jul 09, 2010 6:58 am    Post subject: Hot Weather Concreting of Mass Concrete Reply with quote

Dear Mr SS Pawar ji,

Highly informative posting of 33 slides

Besides all such projects,would be highly benefitting to the concrete Dam works where
mass concreting of high volumes is required for timely completion.

Much appreciation for the gesture of give-give.

with due regards

vikramjeet
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sspawar
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PostPosted: Sat Jul 10, 2010 6:01 am    Post subject: Reply with quote

Dear Vikarm. Jeet sab and Suraj sab,

thank you very much

some points,

  1. As pointed out earlier by suraj sab, thermal Cooling(curing) is one of the important(key) point which differs Mass Concrete to HOT WEATHER concrete.
  2. Hot weather concreting is different from normal concrete at required precation up to cooling of ingredients and external curing, it may be wet curing. Where this topic is doublly critical - MASS CONCRETE IN HOT WEATHER. In Middle East this situation is very common. Sri Singh has worked there and they have also explained very distinctly on this topic.
  3. BIS also tells about HOT WEATHER CONCRETE and MASS CONCRETE by IS 7861_1  and IS 14591_2004

Regards



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