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Img2086
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Item Code: 1238
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LOK-Test equipment being used to pull out an encased steel rod to measure the relative strength of the concrete.
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Img1057
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Item Code: 1099
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Scanning electron microscope (SEM) micrograph of fly ash particles. Although most fly ash spheres are solid, some spheres are hollow cenospheres (as shown). See slide XIV-35 for a view of fly ash in paste.
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Img1058
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Item Code: 1100
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SEM micrograph of plerosphere particle of fly ash containing additional fly ash spheres.
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Img1022
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Item Code: 1064
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Autoclave expansion test for soundness of cement. ASTM C151.
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Img1023
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Item Code: 1065
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Vicat-needle apparatus for setting-time tests of cement. ASTM C191.
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Img2068
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Item Code: 1220
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Field box with thermostat and heating pad for initial curing at 60oF to 80oF of concrete test cylinders. Cylinders are kept in the box until they are transported to the laboratory curing room, usually the next day.
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Img2077
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Item Code: 1229
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Installing a 4-in.-diameter mold for a cast-in-place cylinder. ASTM C873.
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Img2003
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Item Code: 1155
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Power float, used after the bleedwater sheen has evaporated and the concrete will sustain foot pressure with only slight indentation.
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Img2004
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Item Code: 1156
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Good hand troweling. Trowel held firmly and slightly raised in the direction of movement.
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Img1082
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Item Code: 1124
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Conveyor belt at an onsite precast yard. The mobile conveyor carries a steady stream of concrete from ready mix truck to the forms.
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Img1088
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Item Code: 1130
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Small pumps like this one are popular for small and large jobs.
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Img2088
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Item Code: 1240
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Magnetic detection device, pachometer, used to locate steel in concrete.
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Img2008
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Item Code: 1160
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Surface texture produced by brooming. Note roughened surface that will provide skid resistance and safety for pedestrian traffic.
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Img1102
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Item Code: 1144
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Some typical finishing tools used on a small job such as a driveway, sidewalk or patio. Included are a wooden strikeoff (rear), darby (center), and (left to right) a small utility trowel, edger, and magnesium hand float.
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Img2027
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Item Code: 1179
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Liquid membrane-forming compounds are commonly applied to new roads by gasoline-powered rigs. The white pigment reflects heat and minimizes temperature rise due to the sun.
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Img2029
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Item Code: 1181
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Straw or hay is still used to insulate fresh concrete in freezing weather.
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Img2031
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Item Code: 1183
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Drum of a ready mix truck fitted with water sprays to reduce its temperature in hot weather.
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Img1026
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Item Code: 1068
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Loss-on-ignition test to determine prehydration and carbonation caused by improper or prolonged storage or by adulteration during transport and transfer.
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