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
An investigation into the porosity of extrusion-based 3D
Jan 01, 2021 · Furthermore, the 3D printed concrete possesses significantly more voids than the mold-cast concrete that are 2 mm in diameter and larger, of which the mold-cast concrete has little to none. It is theorized that, especially in the case of the longer voids, smearing of the voids occur due to the imparted pressure from pumping while 3D printing.
Oct 20, 2009 · The use of concrete represents about 65% of all the building materials in the world . This leads to overproduction of cement that results to environmental issues such as water pollution [5
Assessment and prediction of concrete flow and pumping
Jul 05, 2018 · Up to10%cash back · As concrete is being discharged, at least three actions happen at the same time: the concrete mixture (1) is subjected to a continuously decreasing pressure in the pumpline; (2) experiences an impact as it is being released to the formwork, unless the end of the pumpline is submerged; and (3) is partially remixed in the formwork with previously delivered concrete. The particular effect of pumping on changes in the concrete air void system has been investigated …
Investigation of parameters influencing erosive wear using
Mar 02, 2019 · The effects of several parameters on the erosive wear were studied using the discrete element method (DEM). The Finnie model was implemented using an open-source code. Regarding the time integration, the Gear algorithm was used, and to ensure the accuracy of the DEM results, a time-step sensitivity analysis was performed. The problem was modeled in two parts: first, the impact of a single
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
Creep in Concrete, Factors affecting Creep & Effects of
Mar 18, 2017 · Concrete creep is defined as: deformation of structure under sustained load. Basically, long term pressure or stress on concrete can make it change shape. This deformation usually occurs in the direction the force is being applied. Like a concrete column getting more compressed, or a beam bending. Creep does not necessarily cause concrete to fail or break apart.
125–175 90–140 1.0–2.0 400–600 19–38 mass concrete in gravity dams, large piers, massive walls, etc. adapted from Table 5.1 aCI Committee Report: Guide for Consolidation of Concrete 309R-05 aCI manual of Concrete Practice 2006 Part 2. 1 While vibrator is operating in concrete. 2 Computed or measured. This is peak amplitude (half the
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Are pumpkins better than heaven? An ERP investigation of
An ERP investigation of order effects in the concrete-word advantage. Tolentino LC(1), Tokowicz N. Author information: (1)Department of Psychology, Learning and Research Development Center, LRDC Room 604, 3939 O' Hara St., University of Pittsburgh, Pittsburgh, PA 15260-5169, USA.
Construction Incidents Investigation Engineering Reports
October 2013: Investigation of the May 23, 2013 Partial Collapse of a Prestressed Concrete Double Tee at Montgomery Mall in Bethesda, MD A construction incident occurred on May 23, 2013, at approximately 1:45 p.m., when a prestressed concrete double tee partially collapsed while it was being jacked, killing one employee and injuring another.
Size Effect on Shear Strength of FRP Reinforced Concrete
May 09, 2012 · This paper presents the results of an experimental investigation that was carried out to examine the size effect on the shear strength and behavior of concrete beams reinforced with fiber-reinforced polymer (FRP) bars.
Effect of Construction Loads and Vibrations on New
Oct 18, 1998 · This paper presents an investigation on the effects of construction loads and vibrations on typical newly poured reinforced concrete bridge decks. The main objective of this paper was to perform dynamic finite-element analyses of concrete bridge decks under construction loads and vibrations.
Investigation of the Internal Stresses Caused by Delayed
Delayed ettringite formation (DEF) in concrete has been identified in recent as a significant cause of deterioration in some of the reinforced concrete infrastructure in Texas. This report is part of a research project, TxDOT project 5218, to investigate the possible long-term structural and durability related effects of DEF in such structures. The
Investigation of support type effect on plastic hinges in
Apr 27, 2021 · This study investigates the effect of support types on plastic hinges in reinforced concrete (RC) beam under the influence of impact loading. In previous studies, the assumption of the linear distribution of inertia force under impact loading was examined and verified according to experimental, analytical, and numerical results.