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We are urging an engineer to specify self-consolidating concrete (SCC) on a project that includes several tall, vertical forms. The engineer recognizes the benefits of SCC regarding consolidation and final surface appearance. The contractor also wants to use SCC because it can speed up the pouring...
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A Progress Report and Task 1 Report for the Self-Consolidating Concrete Formwork Pressure Study are now available, and the latest on recently revised ASTM standards.
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We have been trying to convince our local public works officials to specify segmental retaining wall (SRW) blocks on an upcoming project. We are located in the northern part of the United States. And the county's engineering staff is concerned that the SRW blocks will not be durable given our...
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A proposed new ASTM International standard, WK14283, "Guide for Green Roof Systems," will identify terminology, principles, and concepts for building vegetated green roof systems.
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Q: We are beginning to work on a new set of mix designs for a large commercial project. We are experimenting with some potential changes in the aggregate gradations of our commonly used products.
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We are being forced to look for a new source of coarse aggregate. The problem is our choices are limited. One of our options, and it appears our most economical one, will be from a quarry whose aggregate is known to be susceptible to alkali-silica reactivity.
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Q. We are interested in learning more on how to participate in the green building movement. We are particularly interested in finding out about any standards on products and systems. Where can we start?
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Several important ASTM standards affecting concrete producers have been updated. This list summarizes some committee announcements recently released.
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Maintaining the temperature of concrete.
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Concrete strength testing is a much larger problem for ready-mix producers than many in the industry realize.
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Possible New SCC Field Test
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To avoid problems stripping product, be sure the form is in good conditon.
Many factors influence shrinking and curling of concrete floors.
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ASTM C-1644-06 provides guidance on connectors between concrete wastewater tanks and pipes.
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There's a renewed interest in developing methods to incorporate internal curing as a tool to reduce cracking.