Aug 01, 1997 · A model investigation of turbulence-driven pressure-pumping effects on the rate of diffusion of CO 2, N 2 O, and CH 4 through layered snowpacks W. J. Massman, Search for more papers by this author. R. A. Sommerfeld, Search for more papers by this author. A. R. Mosier,
Effect of Cold Joint on Strength Of Concrete V. R Rathi 1, P. K. Kolase 2 Associate Professor, Head, Department of Civil Engineering, PREC, Loni, MH, India1 PG Scholar, Department of Civil Engineering, PREC, Loni, India2 Abstract: Delay in concreting due to various conditions as well as improper casting sequence can result in cold joints. For
This research study the behaviour of confinement effect in the region of compression simply supported lightweight concrete beams to improve the beams' ductility.The lightweight concrete was obtained by replacing the normal coarse aggregate with thermostone after making the sieve analysis process. Confinement is one method used to increase the structural efficiency of reinforced concrete
Aug 06, 2020 · In order to study the size effect in concrete fracture, three-point bending tests are performed on five groups of geometrically similar concrete beams. The electronic speckle pattern interferometry (ESPI) technique is used to measure the full-field deformation of concrete beams.
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
Preliminary Investigation on Effects of Moisture on Concrete Pavement Strength and Behavior NEERAJ BucH AND DAN G. ZOLLINGER The effects of moisture on pavement concrete properties and behavior are reviewed. Drying of concrete is investigated in terms of Gibbs free energy. A …
UNDERSTANDING THE PUMPABILITY OF CONCRETE
The effects that the fly ash addition has on the behavior of thermally resistant corundum concrete were discussed. Experimental program implied production of two refractory composites: "referent" concrete from 20 % of high-aluminate cement and 80 % of corundum aggregate, "recycled" concrete from 10 % of high-aluminate cement, 20 % of lignite coal ash, and 70 % of corundum aggregate.
THE COMPACTION OF CONCRETE BY INTERNAL VIBRATORS - AN INVESTIGATION OF THE EFFECTS OF FREQUENCY AND AMPLITUDE. The influence of the frequency and amplitude of an internal vibrator upon its effectiveness has been studied in a programme involving the casting of 98 small wall units. The results indicate that the efficiency of a vibrator is related
Jun 29, 2016 · 188.8.131.52 Effects of Free Fall Placement of Concrete. Several detailed studies have been conducted to investigate the effects of free fall on drilled shaft concrete. Baker and Gnaedinger (1960) report a study on the influence of free fall on the quality of concrete. The concrete was placed in an excavation that was 36 inches in diameter and 80 ft
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.
download PDF. Investigation of steel fiber effects on concrete abrasion resistance. Iman Mansouri, Farzaneh Sadat Shahheidari, Seyyed Mohammad Ali Hashemi and Alireza Farzampour. Abstract. Concrete surfaces, industrial floors, sidewalks, roads and parking lots are typically subjected to abrasions. Many studies indicated that the abrasion
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.
Pumpability of Self Consolidating Concrete Abstract During field trials, involving pumping of self compacting concrete, changes in rheological properties have been observed. In order to predict possible changes, studies were undertaken on self compacting mortar (SCM) where various mixing as well as pumping intensities were applied.
Effect of Accelerating Admixture on Properties of Concrete International organization of Scientific Research 49 | P a g e application. Most Concrete specifications restrict the use of calcium chloride or admixtures containing calcium chloride to plain unreinforced concrete and ban it for structural concrete that contains embedded metal.
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
Apr 26, 2012 · The weight loss of the concrete samples immersed in two concentrations of sulfuric acid (3% and 7%) was measured to evaluate the degree of concrete degradation. The effect of the various admixtures on the compressive strength and porosity of the concrete samples were also evaluated in an effort to determine the relationships between these