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1 Break (ore, rock, or stone) into smaller pieces, especially in preparation for sorting:‘the ore was spalled by young women seated at anvils’
- 1.1[no object] (of ore, rock, or stone) break off in fragments:‘cracks below the surface cause slabs of material to spall off’
- ‘Concrete spalls when exposed to elevated temperatures.’
- ‘The elongation of the well bore is the result of compressive shear failure on intersecting conjugate planes, which causes pieces of the borehole wall to spall off.’
- ‘You are also to check on incidence of spalling or cracking concrete on the external faces of the buildings and similarly report with recommendations and estimate of cost.’
- ‘The four supports below the main block also bore carving, now spalled beyond precise recognition.’
- ‘For a uniform ‘flame finish,’ granite is first polished normally, then spalled with a large oxyacetylene burner.’
- ‘Water that freezes in a roof tile can cause the material to spall or crack.’
- ‘Frost fracture, therefore, predominantly affects cortical surfaces, where high porosity allows for absorption of more moisture, producing microcracks, spalling, and frost-potlidding when frozen.’
- ‘It took a little more than one hour of exposure to ISO 834-at a corresponding ambient temperature of about 1,740°F - for the longitudinal cracks and corner spalling to develop in laboratory test columns.’
- ‘A previous owner had applied a sealant to these walls, trapping water inside that had rusted the rebar and caused the blocks to crack and spall.’
- ‘Preventing water absorption stops the surface chipping and flaking, or spalling, which eventually ruins so much concrete.’
- ‘Altar Q's stone legs are today badly spalled, for they also protected the monument's main block from the same destructive process of groundwater transpiration that left them wrecks.’
- ‘When the stone peels or flakes along the bedding planes, spalling or exfoliation takes place.’
- ‘After cooling the staircase and considerable spalling of the plaster work ceased, crews continued upstairs to finally extinguish the first floor.’
- ‘Though ornamented with beautiful huge rock-gripping bristlecones, the cliffs tend to spall off in big chunks and the ore body rock where the mine adits go clearly tends to cave in unless aggressively shored up.’
- 1.1[no object] (of ore, rock, or stone) break off in fragments:
A splinter or chip, especially of rock.
piece, bit, particle, speckView synonyms
- ‘A spall liner and mine protection carpet are installed to minimise the secondary effects of armour penetration and mines.’
- ‘A slick finish won't get dusty, but be careful not to get air-entrained concrete where air can get entrapped below the troweled surface, leading to spalls.’
- ‘He struggled up a steep grade, slipping on the loose spall.’
- ‘Any cracks, chips, holes, dips or spalls should be repaired in order to achieve a flat surface.’
- ‘For protection against mines the vehicle is fitted with a floor spall liner and 18 mm armour plate in the floor.’
Late Middle English (as a noun): of unknown origin. The verb dates from the mid 18th century.
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