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RV: Concrete Slabs-on-Grade

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.... Great Stanley!!. However, do not forget to add: ....... "and extensive
and appropriate curing process".

Marcos J Salom.
Astrum Ingeniería  C.A., Venezuela


-----Mensaje original-----
De: Stanley E Scholl <sscholl2(--nospam--at)juno.com>
Para: seaint(--nospam--at)seaint.org <seaint(--nospam--at)seaint.org>
CC: seaint(--nospam--at)seaint.org <seaint(--nospam--at)seaint.org>
Fecha: Martes, 30 de Julio de 2002 09:38 p.m.
Asunto: Re: Concrete Slabs-on-Grade


>Specifying concrete for slabs by psi is a mistake in my opinion. It is
>easy to get high psi with crappy mixes. Specifying as large of aggregate
>as possible, making the contractor use decent pumps (not grout pumps),
>using adequate thickness, placing joints at adequate spacing, specifying
>at least a 5 sack mix (of PC- not part PC and part fly ash), controlling
>water, wetting the subgrade and curing will usually result in a quality
>job as it always has.
>
>Stan Scholl, P.E.
>Laguna Beach, CA
>
>On Tue, 30 Jul 2002 12:01:25 -0500 "Jim Kestner"
><jkestner(--nospam--at)somervilleinc.com> writes:
>> It seems today that there are more problems (curling, shrinkage
>> cracks,
>> etc.) with concrete slabs-on-grade then in years past. Years ago
>> when we
>> used 3000 psi and few if any additives, there were fewer problems.
>> What has
>> changed?
>>
>> Today, we use 4000 psi concrete, more admixtures, faster schedules,
>> less
>> skilled workers, etc. I seemed to recall that we use 4000 psi in
>> slabs for
>> more durability but we really don't need much durability in schools,
>> offices, clinics, etc. I could see using 4000 psi for industy or
>> warehouses
>> and sidewalks...perhaps 3500 psi for retail. Should we reconsider
>> where we
>> are using 4000 psi?
>>
>> Jim K.
>>
>>
>>
>>
>>
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