1/6/2008 · Publication: Concrete International Volume: 30 Issue: 6 Appears on pages(s): 79-80 Keywords: Date: 6/1/2008 Abstract: When a contractor decides to place concrete using a pump, should the field tests be performed on samples taken at the point of placement
15/7/2021 · https://southwestcp.com or give us a call at 303-781-PUMP (7867) Southwest Concrete Pumping is a locally owned and operated company serving Colorado since 1990. Our main goal is to satisfy our customers on each and every pour.
30/5/2018 · Concrete compressive strength requirements for CFA piles are typically 24 to 31 MPa (3,000 to 4,500 psi) and will be specified according to the project requirements. For grout, 50-mm (2-inch) cubes are most often used for strength testing, (see Figure 7.10) per ASTM C109 (Standard Test Method for Compressive Strength of Hydraulic Cement Mortars).
Concrete Sampling Tests shall be taken at the point of placement whenever possible. Rejection Procedures pumped, the concrete supplier shall coordinate with the contractor to provide the proper allowance for air loss and slump changes due to pumping to
17/6/2021 · Concrete can be pumped at rates of around 80 cubic yards per hour over distances up to 1,300 feet horizontally and 200 feet vertically. Pumping is currently the fastest growing method of handling concrete.
1/1/2003 · Concrete has been successfully pumped at 50 mm slump and Consistence Class S2 (50 to 90 mm slump) is normally recommended for pumping where no special construction demands exist. If high levels of consistence class are required for ease of placing and/or compaction on-site, then special care needs to be taken in the design of the concrete if segregation and excessive bleeding are to be avoided.
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Test Concrete Slump at Point of Discharge or Point of
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Floor Construction with Pumped Concrete. Most well-designed concrete mixes are suitable for pumping. Pumpability is affected by aggregate gradation, shape of aggregate particles, relative amounts of fine and coarse aggregate, absorption of aggregate, cement content, and water content.
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CIP 21 - Loss of Air Content in Pumped Concrete WHAT is Air Loss in Pumping Specifications increasingly require concrete to be sampled at the discharge end of a concrete pump and tested for air content. The intent is to ensure that the specified air content is
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27/7/2012 · Before the start of a selected number of tests, concrete was pumped in the closed reservoir to take samples for the tests on fresh concrete. Initially, when taking the 12 l sample in the rheometer bucket directly at the outlet of the circuit, it was sometimes not fully representative for the concrete …
25/5/2017 · The project is the latest and largest manifestation of the world's increasing appetite for super-tall buildings. According to the Council on Tall Buildings and the Urban Habitat (CTBUH, 2010), there were 82 buildings of 300 m or greater under construction in January 2010, the vast majority of which were being constructed primarily with reinforced concrete.
Slump and other concrete properties also affect line resistance. The basic requirements for a fast-moving, smooth-running pump pour are a level site for the pump, with room to get ready mix trucks in and out; timely delivery of a pumpable concrete; and enough people on the placing and finishing crews to handle the concrete.