Investigation of Concrete Pumping Effects on Air
(PDF) Environmental Impact of Concrete - ResearchGate
Oct 20, 2009 · The use of concrete represents about 65% of all the building materials in the world [4]. This leads to overproduction of cement that results to environmental issues such as water pollution [5
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Pumping of Concrete
These pumps are capable of pumping 130 m3 of concrete per hour with 8 inch pipes. Squeeze pumps or peristaltic pumps are the ones that use vacuum pumping. These pumps can cover a distance of 90 m horizontally and 30 m vertically, and are capable of pumping 20 m3 of concrete per hour using 3 inch pipes. (a) Direct acting piston pump.
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News Detail - American Concrete Institute
Jun 12, 2017 · Supporting ACI Committee: 350, Environmental Engineering Concrete Structures. CRC 37: Minimizing the effect of pumping on SCC workability and freeze-thaw durability. Pumping is a widely-used technique to place concrete in formworks, however, the pumping operation affects the workability and the air-void distribution of concrete.
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Concrete Conductivity: Effects of temperature, saturation
• Concrete conductivity follows Arrhenius relationship for temperatures ranging between -18°C to 23°C. •The concrete conductivity reduces by 30% when its saturation level is reduced from to 80%. •Segregation can effect the concrete conductivity. •Concretes with higher air contents are difficult to saturate compared to concretes
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Research - Concrete Pumping Effects on Entrained Air-Voids
Air entrainment and its effects in concrete • Aggregate
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Concrete Pumping Effects on Air-Entrained Voids in
Air entrainment and its effects in concrete • Aggregate
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EFFECTS OF AGGREGATE TYPE, SIZE, AND CONTENT ON …
concrete, principally about the effects on fracture energy. Some research (Strange and Bryant 1979, Nallathambi, Karihaloo, and Heaton 1984) has shown that there is an increase in fracture toughness with an increase in aggregate size. However, Gettu and
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Effects of Vibration on Concrete Mixtures
Effects of Vibration on Concrete Mixtures Fall 2021 PROJECT TITLE Effects of Vibration on Concrete assess the effects of air content, water content, the presence of methods. Other nonstandardized tests used are discussed as follows. Vibration Energy Test The vibrator used for this investigation was a commercial controlled-frequency
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Investigating Effects of Concrete Handling on Air Content
Air entrainment and its effects in concrete • Aggregate
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Pumping of Concrete: System, Working and Problems
Pumping of concrete is economical if the quantity of concrete required is more than about 1150 m 3 or uninterrupted supply of concrete is needed over a long period as at the beginning of each period of pumping the pipes have to be lubricated by mortar (at the rate of about 0.25 in 3 per 1000 m length of 150 mm diameter pipe) and also at the end of the operation considerable effort is needed
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EFFECT OF PUMPING ON AIR CHARACTERISTICS OF …
EFFECT OF PUMPING ON AIR CHARACTERISTICS OF CONVENTIONAL CONCRETE. The stability of the air content of concrete during pumping has been the subject of a number of recent investigations. Because increasing volumes of concrete are placed with the aid of pumps and the durability of such concrete to freezing and thawing (ASTM C666) as well as the
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Types and Causes of Concrete Deterioration
Concrete can deteriorate for a variety of reasons, and concrete damage is often the result of a combination of factors. The following summary discusses potential causes of concrete deterioration and the factors that influence them. CORROSION OF EMBEDDED METALS Fig. 1. Corrosion of reinforcing steel is the most common cause of concrete
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Concrete Pumping Effects on Entrained Air-Voids
Concrete Pumping Effects on Entrained Air-Voids Author: William Elkey, Donald J. Janssen, Kenneth C. Hover Subject: Admixtures, Air entraining agents, Air voids, Fly ash, Freeze thaw durability, Lignosulfonate, Mix design, Pressurization, Pumped concrete, Stability (Mechanics), Water reducing agents Keywords
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Magazine of Concrete Research - ICE Virtual Library
Jun 03, 2000 · The sorptivity values showed no clear relationship to the compressive strength. The type of wet-process pump was found to have little effect on the in situ compressive and flexural strengths but did affect the bond strength, although this was mainly because of the stream velocity and w/c ratio rather than the pumping process.
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Sewerage Manual Part 1 v4 (with Eurocodes) - deletion of SM3
Wind load Code of Practice on Wind Effects in Hong Kong Reinforced concrete structures BS EN 1990 and BS EN 1992 (in general) - Pumping station - BS EN 1992 (superstructure) and BS EN 1992-3 (substructure) - Tunnel lining - BS EN 1992-3 (liquid retaining properties) and GEO Manuals, Guidelines and Publications (geotechnical)
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CONCRETE PUMPING EFFECTS ON ENTRAINED AIR-VOIDS. FINAL REPORT
CONCRETE PUMPING EFFECTS ON ENTRAINED AIR-VOIDS. FINAL REPORT. Pumping is a frequently used method of efficiently transporting concrete from the delivery vehicles to the formwork. Unfortunately, pumping concrete can affect the air content of a concrete mix. This has caused concern about the possible loss of resistance of the concrete to
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