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INVESTIGATION OF CONCRETE PUMPING EFFECTS ON

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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Rheology of cement paste under high pressure - ScienceDirect

Mar 01, 2017 · 1. Introduction. Pumping is a general way to transport cement-based materials at construction sites, .Such pumped mixtures are subjected to high pressure during pumping, especially in large-scale construction such as high-rise buildings, long-span bridges, long-distance tunnels, oil-well cementing applications, and ground strengthening by injection of paste or mortar,,, .

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Experimental investigation and prediction on the effects

Oct 29, 2021 · The main objective of this work is to determine the mechanical properties of bamboo and glass fiber reinforced concrete. In concrete, E-glass and bamboo fibers are mixed with three different proportions such as 25:75, 50:50, and 75:25. Cubical-, beam-, and cylindrical-shaped concrete structures are developed for mechanical testing.

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Avoid too Much Pressure in Concrete | For Construction Pros

Jul 01, 2010 · Concrete placement technique directly affects placement rate. Placing concrete with a crane and bucket, as shown in the photo above, is a slower process than placing concrete with …

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Concrete Pumping Effects on Air-Entrained Voids in

Effects of Ground Granulated Blast Furnace Slag in

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Investigation of steel fiber effects on concrete abrasion

Concrete surfaces, industrial floors, sidewalks, roads and parking lots are typically subjected to abrasions. Many studies indicated that the abrasion resistance is directly related to the ultimate strength of the cured concrete. Chemical reactions, freeze-thaw cycles, and damages under abrasion are among many factors negatively affecting the concrete strength and durability.

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(PDF) Effect of Pumping on Properties of Bridge Concrete

Jul 02, 1994 · 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 freezing and thawing. The actual effect of pumping on the air content measured for the concrete is not consistent; in some cases air content has increased, while in others it has decreased.

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Research - Concrete Pumping Effects on Entrained Air-Voids

Effect of Accelerating Admixture on Properties of Concrete

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EFFECT OF HEIGHT ON PUMPED CONCRETE PLACING AT …

2. More slump has to be provided while pumping to neglect the effect of temperature while concreting at heights. 3. Continuity of concrete pumping has to be maintained with atmost care to minimize the chances of choking of pipeline. 4. Straight concrete pipes with smaller lengths .i.e. distance and minimum bends has to be adopted. 5.

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Experimental and numerical investigation of the effect of

Apr 28, 2020 · The increasing detrimental impact of climate change is evident all over the world as a result of the rising emission of carbon dioxide into the environment. The cement industry is responsible for about 7% of the world's anthropogenic carbon emissions. To reduce this negative impact of cement, this study was carried out to investigate the use of sawdust ash (SDA) as a partial replacement of

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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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Rheo-morphological investigation of Reynolds dilatancy and

Reynolds dilatancy is one of the main mechanisms responsible for the lubrication layer (LL) formation during pumping of self-consolidating concrete (SCC). In this study, the effect of morphological characteristics of coarse aggregate on Reynolds dilatancy of 30 different SCC mixtures was investigated.

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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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Concrete pumping and its effect on the air void system

Effect of Accelerating Admixture on Properties of Concrete

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Concrete Slab Surface Defects: Causes, Prevention, Repair

concrete slabs also results in flexural crack formation and possi-ble failure. Cracking in concrete can be reduced significantly or eliminated by observing the following practices: 1. Use proper subgrade preparation, including uniform support and proper subbase material at adequate moisture content. 2.

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RC-1574 - Improved Performance of JPCP Overlays

investigation results that support the pumping mechanism. Two distinctly different performance stages were identified from IRI results. Initially the percentage of good IRI (IRI < 95) for a project length is constant and nearly . This is the period where pumping erosion has little if any structural level effect, but is developing

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FIELD INVESTIGATION OF SUBGRADE NON-UNIFORMITY …

A few past studies have looked in to characterizing the effects of non-uniform support conditions or voids on slab responses (12)(13)(14) . One of traditional mechanisms that effect stresses in pavement is the curling of the concrete slab due to differential temperature profiles, i.e., …

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Investigation of Construction Specification Effects on

Investigation of Construction Specification Effects on Energy Pile Efficiency Permissions; Share. Abstract. The combination of the Ground Source Heat Pump (GSHP) with energy piles has become a viable alternative to traditional indoor climate control. As geothermal energy pile applications increase in size and demand, maintaining the highest

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Fresh Concrete Pumping Arrest Investigation for | Talenet

Fresh Concrete Pumping Arrest Investigation for Thixotropy . Aug 25, 2019 · Up to10%cash back · It is clear that flow re-initiation after rest in concrete pumping is poorly understood. Numerical simulation could be one approach for further analysis and is potentially important for practice.

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Strength and Microstructural Investigation of Quaternary

Nov 08, 2021 · This research focuses on studying the effect of different supplementary cementitious materials (SCMs) such as waste ceramic powder (WCP), lime powder (LP), and ground granulated blast furnace slag (GGBS) in combination on strength characteristics and microstructure of quaternary blended high-strength concrete. To achieve the aims of the study, necessary physical and chemical …

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