Criteria for Selection and Design of Residential Slabs-on-Ground (1968) / Chapter Skim
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Part B: Quality Control
Part B: Quality Control
Pages 126-135
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From page 126... ...
While the loads normally encountered with a residential slab-on-ground will be relatively light as compared with those in larger multi-storied buildings, it is nevertheless true that carefully designed house slabs can be and are damaged through lack or inadequacy of quality control. Thus, the quality and soundness of the finished slab are dependent to a large extent on procedures often ignored or compromised.
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From page 127... ...
will have a relatively low qu, such materials, when used in a fill, should be subjected to analysis by a qualified soils engineer for both compressibility and potential heaving effects. The amount of compaction required can best be determined by proper analysis and laboratory tests conducted by a qualified soils engineer.
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From page 129... ...
2.1.2 Uncontrolled Fills Uncontrolled fills are those which do not meet the control requirement. They are subject to nonuniformity, and their qualities as foundation support cannot be accurately predicted unless verified beforehand by appropriate soil investigation methods.
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From page 130... ...
2.1.5 Fill Materials Where site conditions require fill materials, such fill should conform to one of the following conditions: a. Clean granular type such as gravel, crushed stone, or sand, uniformly graded with 2 - inch maximum size.
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From page 131... ...
While the quality of materials used in concrete is generally taken for granted, attention should be directed to the minimum specifications for materials upon which these recommendations are based. The latest revisions of the following American Society for Testing and Materials Standards should be used for slab materials: ASTM C-33 - Specifications for Concrete Aggregates ASTM C-330 - Specifications for Lightweight Aggregates for Structural Concrete ASIM C-150 - Specifications for Portland Cement ASTM C- 175 - Specifications for Air- Entraining Portland Cement ASTM C-94 - Specifications for Ready-Mixed Concrete ASTM C-205 - Specifications for Portland Blast-Furnace Cement ASTM C-260 - Specifications for Air-Entraining Admixtures for Concrete ASTM A-15 - Specifications for Billet-Steel Bars for Concrete Reinforcement ASTM A-16 - Specifications for Rail-Steel Bars for Concrete Reinforcement ASTM A-160 - Specifications for Axle-Steel Bars for Concrete Reinforcement ASTM A-185 - Specifications for Welded Steel Wire Fabric for Concrete Reinforcement.
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From page 132... ...
To this end, such practices have been related to levels of technical competence in proportioning and mixing which may be prodded on the job. 4.1 Engineer or Architect Supervision Where proportioning, mixing, and placing of concrete are performed under control of a competent representative of Me architect or 1ASTM Designation C-39, Method for Test for Compressive Strength of Molded Concrete Cylinders.
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From page 133... ...
d. Under some conditions, such as hot, dry weather with long waiting periods between mixing and placing of concrete, it may be necessary to add water to the mix at the job site to regain recommended slump after water has evaporated from the mix.
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From page 134... ...
To prevent too rapid drying, the concrete slab should be covered as soon after placement as is possible without marring the surface. Materials such as moist burlap, canvas, cotton matting, liquid membranes, foaming compounds, polyethylene sheeting, or waterproof curing paper with edges sealed, may be used to cover the concrete during curing.
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From page 135... ...
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