scholarly journals Does Self-Compacting Concrete Exert more Pressure on Formworks than Normal Vibrated Flowing Concrete?

2021 ◽  
Vol 9 (3) ◽  
pp. 11-17
Author(s):  
Yousif Hummida Ahmed ◽  
Osama Ibrahim ◽  
Alaa Elbadawi ◽  
Firouz Abdalgadir ◽  
Osman Ahmed ◽  
...  
Keyword(s):  
Polyvinyl Chloride ◽  
Lateral Pressure ◽  
Lateral Movement ◽  
Self Compacting Concrete ◽  
Lateral Deflection ◽  
Filling Materials ◽  
Different Depths ◽  
Cylindrical Mold ◽  
Lateral Deflections

This paper investigates lateral pressure on formwork indirectly by measuring lateral deflection using an innovative device. This device is fabricated from Polyvinyl Chloride (PVC) cylindrical mold in a fashion allowing occurrence and measurement of lateral movement at different depths using dial gauges. The lateral deflections for different systems of filling materials including water, sand, self-compacting concrete (SCC), and flowing concrete. The flowing concrete is tested under two conditions, vibrated (NVC), and non-vibrated (NCno.V). The results show that the NVC produced the largest lateral deflection which attributed to the vibration pressure. The measured lateral deflection are ranked descending in the following order: NVC, Water, SCC, NCno.V and Sand.  

Review of Techniques for Predicting the Fundamental Period of Multi-Storey Buildings: Effects of Nonstructural Components

2015 ◽  
Vol 15 (02) ◽  
pp. 1450039 ◽  
Author(s):  
Massoud Sofi ◽  
Graham Leighton Hutchinson ◽  
Colin Duffield
Keyword(s):  
Tall Buildings ◽  
Lateral Load ◽  
Wind Load ◽  
Lateral Stiffness ◽  
Limit States ◽  
Nonstructural Components ◽  
Lateral Deflection ◽  
Moderate Seismicity ◽  
Drift Limit ◽  
Lateral Deflections

The design of lateral load resisting elements of tall buildings in regions of low to moderate seismicity is normally governed by the requirements to meet inter-storey drift limit under wind load. The key objective of the design of tall buildings is to provide adequate lateral stiffness to the buildings to limit their lateral deflections and inter-storey drifts under the lateral load. The current design practice assumes that only the structural skeleton provides lateral resistance against wind load. Although the effects of nonstructural elements on the lateral stiffness are widely acknowledged, the effects are often ignored in the analysis of the buildings. This paper presents a state-of-the-art of review on the effects of nonstructural elements on the lateral deflections and inter-storey drifts of buildings at serviceability limit states. It was found that ignoring the nonstructural elements could significantly underestimate the lateral deflection for certain types of buildings. However, the shape and form of the lateral deflection in the overall building is not significantly affected by the nonstructural elements.

Null effect of scratches made by curling rocks

2019 ◽  
Vol 233 (3) ◽  
pp. 370-374 ◽  
Author(s):  
Mark RA Shegelski ◽  
Edward Lozowski
Keyword(s):  
Experimental Evidence ◽  
Simple Experiment ◽  
Lateral Deflection ◽  
Appreciable Difference ◽  
Null Effect ◽  
Ice Conditions ◽  
Lateral Deflections

There is disagreement in the literature as to whether scratches made by curling rocks affect the motion of subsequent curling rocks. The aim of this investigation is to provide unequivocal experimental evidence to resolve this disagreement. Such evidence has been obtained by comparing the curl distances (total lateral deflections) of rocks sliding over ice with no scratches to curl distances of rocks sliding over ice completely covered with scratches made by previous curling rocks. The result of this simple experiment is that there is no appreciable difference in the curl distances between the two ice conditions. The conclusion is that the scratches made by curling rocks do not affect the motion of other curling rocks and that the lateral deflection of curling rocks cannot solely be due to scratches made by curling rocks.

scholarly journals Formwork Pressure of a Heavyweight Self-Compacting Concrete Mix

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1549
Author(s):  
Michał A. Glinicki ◽  
Jacek Gołaszewski ◽  
Grzegorz Cygan
Keyword(s):  
Lateral Pressure ◽  
Neutron Radiation ◽  
Radiation Shielding ◽  
Self Compacting Concrete ◽  
Pressure Transducers ◽  
Concrete Mixtures ◽  
Gauge Pressure ◽  
Heavyweight Concrete ◽  
Formwork Pressure

High-fluidity and self-compacting concrete (SCC) mixes were developed using special aggregates for radiation-shielding concrete. The special aggregates comprised heavyweight and hydrous aggregates (crushed magnetite, crushed serpentine, and their mixtures), which were selected to provide an enhanced attenuation of gamma and neutron radiation, respectively. For the mixed concrete design with a bulk density of up to 3570 kg/m3, two cement types were used: Portland cement CEM I and slag cement CEM III/A. The basic properties of the fresh self-compacting concrete were evaluated and the lateral formwork pressure exerted by the freshly mixed self-compacting concrete was measured and analyzed. An original test setup was developed for the determination of the lateral pressure on the square column formwork with pressure measurements carried out using six strain gauge pressure transducers, which was adequate for heavyweight concrete mixture testing. Self-compacting concrete mixtures containing a magnetite aggregate or blends of serpentine and magnetite aggregates with a slump flow of at least 550 mm were developed. The lateral pressure on the formwork was directly proportional to the density of the self-compacting heavyweight concrete mixes. The maximum values of the lateral pressure recorded in the test at a casting speed of 1.5 m/h did not exceed 27 kPa and 55% of hydrostatic pressure. Concrete mixtures with basalt, magnetite, and magnetite/serpentine blended aggregates were found to develop sufficient shear strength for proper stability during casting.

scholarly journals THE SEISMIC BEHAVIOR OF BURIED SEABED WALLS IN LIQUEFACTION SOIL

2021 ◽  
Vol 30 (1) ◽  
Author(s):  
Javad Royaei ◽  
Kabir Sadeghi
Keyword(s):  
Seismic Behavior ◽  
Lateral Pressure ◽  
Numerical Study ◽  
Lateral Movement ◽  
Numerical Studies ◽  
Experimental Specimen ◽  
Abaqus Software

The present study aimed to investigate the seismic behavior of enclosed seawater walls, the buried site of which lies in liquefaction soil. An experimental specimen was manufactured and tested on the seismic table, and a numerical study was also modeled in the ABAQUS software based on the experimental outcomes. In both the experimental and numerical studies, a susceptible liquefaction layer around the root of the wall was considered due to the root lean soil leakage and large lateral pressure, and the soil behind the root caused the failure of the buried section. According to the results, the lateral movement significantly decreased due to the backing effect of this layer on the buried section of the wall. Furthermore, an active wedge was formed from the buried side to the back of the containment, and the braces were overwhelming due to the presence of the locks in the wedge and their movement along with the wedge. The displacement of the crown and foot of the wall decreased with the increased base acceleration and higher frequency of the entrance movement.

Effect of Rheology-Regulation Additives on the Formwork Lateral Pressure of the Self-Compacting Concrete

2014 ◽  
Vol 584-586 ◽  
pp. 1111-1115
Author(s):  
Hui Chen ◽  
Jian Ming Yang ◽  
Jia Wei Zheng
Keyword(s):  
Lateral Pressure ◽  
The Self ◽  
Experimental Simulation ◽  
Mineral Admixtures ◽  
Pressure Casting ◽  
Cement Slurry ◽  
Self Compacting Concrete ◽  
Safety Hazard ◽  
Potential Safety ◽  
Different Content

This article mainly aims at to research the affect of thixotropy on the development of the formwork lateral pressure, the ultimate goal is to minimize the potential safety hazard of construction.Before the experiment, through the tests of net cement slurry, we can determine kaolin (additive) to change the influence of the liquidity of concrete. For the mixture of self-compacting concrete (SCC) ,set different content of admixture. Through experimental simulation measurement in 4 meters height of concrete pouring and pouring diameter of 150 mm, test the size of the lateral pressure casting the bottom template, and compare the condition of not using mineral admixtures, helps to identify the most appropriate for the amount of admixture.

Influence of self-compacting concrete on the lateral pressure on formwork

2012 ◽  
Vol 165 (3) ◽  
pp. 127-138 ◽  
Author(s):  
Michael J. McCarthy ◽  
Ravinda K. Dhir ◽  
Sinan Caliskan ◽  
M. Kashif Ashraf
Keyword(s):  
Lateral Pressure ◽  
Self Compacting Concrete
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