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Anonymous Poster #1

Cover Block Preparation

11/16/2019 12:50 AM

Dear sirs,

How can we make standard cover block to be used for say 5 cm concreting? We made one with 1:4 cement/sand but it got crushed.

Regards,
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SolarEagle
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Join Date: Mar 2007
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#1

Re: Cover block preparation.

11/16/2019 1:49 AM

Well first you need the proper type of cement, and you need probably a 50/50 mix of cement to sand, and some ~3/8" aggregate and possibly some superplasticizer...

https://www.concreteconstruction.net/how-to/various-thickness-overlay_o

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HiTekRedNek
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#2

Re: Cover block preparation.

11/16/2019 6:10 AM

Insufficient information.How much weight?Area of contact?Anything can be crushed.

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Stef
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#3

Re: Cover Block Preparation

11/17/2019 2:43 AM

For this sort of cover block I always make the following mixture 3 gravel of a size suitable for the thickness of the cover, 2 river sand, 1 cement. Preferably the cement is good Portland cement not the stuff loaded with fly ash and include mesh in the cover.

Keep the cover moist for at least 7 days to slow the curing and prevent cracking. When cured correctly this will form a waterproof high strength concrete.

More cement can be added in moderation to increase the MPa of the concrete and go easy on the water because a sloppy wet mix will have a lower compressive strength.

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JRaef
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#4

Re: Cover Block Preparation

11/18/2019 8:09 AM

How is this related to Electrical Engineering?

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Jpfalt
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#5
In reply to #4

Re: Cover Block Preparation

11/18/2019 1:35 PM

Probably the cover for an electrical vault and many of the responses are positively shocking.
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PWSlack
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#6
In reply to #5

Re: Cover Block Preparation

11/19/2019 10:49 AM

Good grief...

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