sugg.

Segun este sitio http://www.asocem.org.pe/SCMRoot/bva/f_doc/concreto/MGC24_Ar...

Irregularidades superficiales: causas
Cavidades:
Debidas a salientes en la superficie del encofrado. Vacíos causados por burbujas de aire. Grupos de cavidades en forma de nidos de piedra, cangrejeras. por lo que segun este otro
http://www.graniterock.com/technical_notes/concrete_surface_...
La palabra sería air or rock pockets.

hay muy buenas fotos en este http://www.oboa.on.ca/events/2009/sessions/files/Slab Surfac...

Blisters


Or air pockets. P/see reference below.


www.plastictroubleshooter.com/ThePlasticTroubleshooter/blis...


This excessive air may not be drawn out of the material during the molding process and pockets of the air may be forced to the surface of the molded part,

If this is about concrete, these "nidos" (short for nidos de abeja) in spanish are called honeycombs in english (honeycombing if you want). These are voids or cavities in concrete that happen when the mortar does not fill in the spaces between the coarse particles.

Two good references:

http://www.thasa.com/HOME2/Que_hacemos.htm
http://www.inti.gob.ar/cirsoc/pdf/publicom/Terminologiaespan...
(this is one is a good glossary in spanish for concrete terminology, with entrances in english too)

www.familyhandyman.com › ... › Exterior Repairs › Concrete Repair
How to Fix Sidewalks That Are Chipped and Pitted, Extend the life of old concrete by fixing broken, crumbling areas before the problem gets worse. A properly ...
New Concrete Pitting -- Why? - DoItYourself.com Community Forums
www.doityourself.com/...concrete/58644-new-concrete-pitting...
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How to Repair Pitted Concrete | eHow.com
www.ehow.com › Home Maintenance & Repair
How to Repair Pitted Concrete. Stress, exposure to the elements and salt all wreak havoc on concrete over time. Concrete is not infallible, and pitting is one of ...
Construction Industry: pitting in concrete, air pockets, bandaide
en.allexperts.com/q/Construction-Industry.../2/pitting-concrete.htm
26 Feb 2009 – air pockets, bandaide, lien laws: Dear Denise, I regret your driveway was not installed properly. Pitting usually is caused by allowing the gravel ...
Concrete | Eliminating Surface Voids in Concrete | Mold Making and ...
www.smooth-on.com/Concrete/c13/p59/...in-Concrete/pages.htm...
Surface voids (small holes, also known as bug holes or pitting) found on the ... Question: How does a release agent affect the surface of a concrete casting? ... during vibration and allows larger pieces of aggregate to move around freely. ...

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Note added at 21 hrs (2011-11-12 20:43:04 GMT)
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Saludos
eski :))