scholarly journals Shear Behaviour of Reinforced Self-Compacting Concrete Beams Made with Treated Recycled Aggregate

2019 ◽  
Vol 12 (3) ◽  
Author(s):  
Doaa H. Al-Jasimee ◽  
M.S. Abo Dhaheer
Keyword(s):  
High Strength ◽  
Treatment Method ◽  
Shear Capacity ◽  
Recycled Aggregate ◽  
Shear Behaviour ◽  
Structural Performance ◽  
Self Compacting Concrete ◽  
Ultimate Failure ◽  
Normal Strength ◽  
Cracking Pattern

In this paper, an experimental work was conducted to investigate the possibility of improving the structural performance of reinforced self-compacting concrete (SCC) beams cast with 100% treated and untreated recycled aggregate (RA). RA was first exposed to a simple treatment method to reduce the amount of its adhered mortar and to improve its performance by the impregnation in polyvinyl alcohol (PVA) polymer solution. After completing RA treatments, rectangular simply supported reinforced SCC beams cast with RA, treated recycled aggregate (TRA) as well as normal aggregate (NA), were prepared and tested under two-point loading up to failure. Half of the prepared beams were tested to evaluate the shear behaviour of normal strength (NS) SCC mixes, while the other half was tested for high strength (HS) SCC mixes. The results were evaluated with regards to load deflection response, ultimate failure load, first crack load, and cracking pattern. The main experimental results demonstrated that using treated RA considerably improved the shear capacity of reinforced SCC beams in comparison with that of untreated RA. Based on the ACI 318-14 and Euro codes, the shear strength values showed that the treated RA beams were considered more conservative compared to the RA beams in both strength grades.  

scholarly journals SHEAR PERFORMANCE OF SPECIAL DRY JOINTS FOR PRECAST CONCRETE SEGMENTS

2021 ◽  
Vol 11 (1) ◽  
pp. 60-72
Author(s):  
Watanachai Smittakorn ◽  
Tosporn Prasertsri ◽  
Worapon Pattharakorn ◽  
Pitcha Jongvivatsakul
Keyword(s):  
Prestressed Concrete ◽  
Precast Concrete ◽  
High Strength ◽  
Shear Capacity ◽  
Fiber Volume ◽  
Strength Concrete ◽  
Test Parameters ◽  
Ductile Shearing ◽  
Shear Performance ◽  
Normal Strength

The special dry joints for precast prestressed concrete segments are invented in this study toovercome the limitation of conventional dry joints. Eight specimens of special dry joints were madeand subjected to direct shear test. Test parameters comprise concrete compressive strength (normaland high strength concrete) and steel fiber volume added in the special dry joint (0%, 0.5%, and1.0%). Test results revealed that the inclusion of steel fibers remarkably enhanced the shear capacityand ductility index. Failure mode of specimens was changed from shearing off to concrete crackingaround shear key corners, defined as ductile shearing-off failure. Furthermore, the existing equationsfor predicting shear capacity of keyed joints were validated by the experimental results. Amongavailable equations from literatures, the Turmo’s equation yields better prediction of the shearcapacity for the special dry joint made with normal strength concrete.

scholarly journals An Analytical and Numerical Investigation on Punching Shear Behaviour of SCC Slab

2016 ◽  
Vol 3 (3) ◽  
Author(s):  
V. Kavinkumar ◽  
R. Elangovan
Keyword(s):  
Shear Stress ◽  
Shear Failure ◽  
Shear Capacity ◽  
Punching Shear ◽  
Shear Behaviour ◽  
Slab Thickness ◽  
Failure Zone ◽  
Self Compacting Concrete ◽  
Concentrated Load ◽  
Different Thickness

<div><p><em>This research is to study the mechanical properties of Self Compacting Concrete (SCC) as well as punching shear failure of SCC slabs. Self compacting concrete was first invited in 1988 to achieve durable concrete structures .Design of Reinforced concrete slab is often compromised by their ability to resist shear stress at punching shear surface area. The connection between slabs and supporting columns could be susceptible to high shear stress and might cause sudden and brittle failure. Punching shear failure takes the form of truncated pyramid shape. This program includes investigating the effect of SCC, slab thickness on the punching shear behaviour in terms of load-deflection response and ultimate failure load, failure characteristic of punching shear failure (shape of failure zone and size of failure zone) of simply supported slabs of 1000 x 1000 x 50 and 75mm under concentrated load at centre of slab. The slabs are made with both SCC and Conventional concrete (CC). Investigation included two way specimens with different thickness to evaluate the performance of specimen with different thickness and the effect of thickness on punching shear capacity and performance</em>.</p></div>

scholarly journals Experimental Investigation on the Shear Behaviour of Stud-Bolt Connectors of Steel-Concrete-Steel Fibre-Reinforced Recycled Aggregates Sandwich Panels

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5185
Author(s):  
Arash Karimipour ◽  
Mansour Ghalehnovi ◽  
Mohammad Golmohammadi ◽  
Jorge de Brito
Keyword(s):  
Shear Strength ◽  
Coarse Aggregate ◽  
Sandwich Panels ◽  
High Strength ◽  
Steel Plates ◽  
Recycled Aggregates ◽  
Shear Behaviour ◽  
Concrete Core ◽  
Steel Fibres ◽  
Normal Strength

Steel-concrete-steel (SCS) sandwich panels are manufactured with two thin high-strength steel plates and a moderately low-density and low-strength thick concrete core. In this study, 24 specimens were produced and tested. In these specimens, a new stud-bolt connector was used to regulate its shear behaviour in sandwich panels. The bolts’ diameter, concrete core’s thickness and bolts’ spacing were the parameters under analysis. Furthermore, the concrete core was manufactured with normal-strength concrete and steel fibres concrete (SFC). Steel fibres were added at 1% by volume. In addition, the recycled coarse aggregate was used at 100% in terms of mass instead of natural coarse aggregate. Therefore, the ultimate bearing capability and slip of the sandwich panels were recorded, and the failure mode and ductility index of the specimens were evaluated. A new formula was also established to determine the shear strength of SCS panels with this kind of connectors. According to this study, increasing the diameter of the stud-bolts or using SFC in sandwich panels improve their shear strength and ductility ratio.

scholarly journals Hybrid Effects of Stirrup Ratio and Steel Fibers on Shear Behaviour of Self-Compacting Concrete

2018 ◽  
Vol 64 (1) ◽  
pp. 145-169
Author(s):  
Praveen Kannam ◽  
Venkateswara Rao. Sarella ◽  
Rathish Kumar Pancharathi
Keyword(s):  
Failure Mode ◽  
Mechanical Behaviour ◽  
Shear Failure ◽  
Ultimate Load ◽  
Steel Fiber ◽  
High Strength ◽  
Steel Fibers ◽  
Shear Behaviour ◽  
Self Compacting Concrete ◽  
Shear Cracking

Abstract Shear cracking behaviour of fibrous self-compacting concrete of normal and high strength grade (M30 and M70) is presented here. Two stirrup diameters (6mm ∅ and 8 mm ∅) with a constant steel fiber content of 38 kg/m3 (0.5% by volume of concrete) were selected for the present study. The size of the beam was fixed at 100x200x1200mm. The clear span of the beam 1100mm, was maintained throughout the study. A total of 16 shear-deficient beams were tested under three point loading. Two stirrup spacing (180mm and 360 mm) are used for the shear span-to-depth ratio (a/d = 2). Investigation indicates that initial cracking load and ultimate load increased as the area of shear reinforcement increased by increasing the diameter of stirrup. It was also noted that the failure mode was modified from brittle shear failure to flexural-shear failure in the presence of fibers. The mechanical behaviour of SFRSCC was improved due to the combined effect of stirrups and steel fibers. The stiffness, toughness, and deflection of the beams increased when compared to SCC beams without fibers. The experimental results were compared with existing models available in literature, and the correlation is satisfactory.

Shear Behaviour of RC Beams without Stirrups Made of Normal Strength and High Strength Concretes

2010 ◽  
Vol 13 (1) ◽  
pp. 29-41 ◽  
Author(s):  
M. Hamrat ◽  
B. Boulekbache ◽  
M. Chemrouk ◽  
S. Amziane
Keyword(s):  
High Strength ◽  
Shear Behaviour ◽  
Rc Beams ◽  
Normal Strength

scholarly journals Experimental Investigation on the Static Performance of Stud Connectors in Steel-HSFRC Composite Beams

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2744
Author(s):  
Fangwen Wu ◽  
Wenlong Tang ◽  
Chengfeng Xue ◽  
Guorui Sun ◽  
Yanpeng Feng ◽  
...  
Keyword(s):  
Large Diameter ◽  
Influence Factors ◽  
High Strength ◽  
Composite Beams ◽  
Shear Capacity ◽  
Fiber Reinforced Concrete ◽  
Empirical Formulas ◽  
Characteristic Points ◽  
Static Performance ◽  
Normal Strength

In this research, high strength fiber reinforced concrete (HSFRC) was used to replace the normal strength concrete (NSC) in steel-concrete composite beams to improve their working performance, which might change the static performance of stud connectors. Firstly, push-out tests were conducted to investigation on the static performance of stud connectors in steel-HSFRC composite beams and compared with steel-NSC composite beams. Studs of 8 sizes, 13 mm, 16 mm, 19 mm and 22 mm in diameter and 80 mm and 120 mm in height were adopted to study the influence of stud dimension. The test phenomenon shown that the crack resistance of HSFRC was better than that of NSC, and there were some splitting cracks on NSC slabs whereas no visible cracks on HSFRC slabs when specimens failed. Next, the load-slip curves of studs were analyzed and a typical load-slip curve was proposed which was divided into four stages. In addition, the effects of test parameters were analyzed according to the characteristic points of load-slip curve. Compared with NSC slab, HSFRC slab could provide greater restraining force to the studs, which improved the shear capacity and stiffness of studs while suppressed the ductility of studs. The shear capacity, stiffness and ductility of studs would significantly increase with the increasement of stud diameter and the studs with large diameter were more suitable for steel-HSFRC composite beams. The stud height had no obvious influence on the static performance of studs. Finally, based on the test results, the empirical formulas for load-slip curve and shear capacity of stud connectors embedded in HSFRC were developed which considered the influence factors more comprehensively and had better accuracy and applicability than previous formulas.

scholarly journals Shear strength evaluation of reinforced recycled aggregate concrete beams

2021 ◽  
Author(s):  
Roya Shoghi Haghdoost
Keyword(s):  
Shear Strength ◽  
Shear Capacity ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Shear Behaviour ◽  
Strength Prediction ◽  
Shear Reinforcement ◽  
Aggregate Concrete ◽  
Ann Models ◽  
Shear Reinforcements

A theoretical study is conducted to investigate the shear behaviour of recycled aggregate concrete (RAC) beams with and without shear reinforcements along with the performance evaluation various Code based/other existing equations in predicting shear strength. In addition, three artificial neural network (ANN) models for shear strength prediction of RAC beams with and without shear reinforcements are developed and their performance validated by using 108 beams from available research studies. Most of the Codes and existing methods underestimate the shear capacity of RAC beams with/without shear reinforcement. However, over estimation of shear strength by Codes/existing methods for about 10% RAC beams needs to be addressed when using such Codes/existing methods for shear strength prediction. All three ANN models are found to predict shear strength of RAC beams. Developed ANN models are able to simulate the effect of shear reinforcement on the shear strength of RAC beams.

Shear strength of concrete beams cast with self-compacting concrete containing different fillers and coarse aggregates

2012 ◽  
Vol 39 (7) ◽  
pp. 760-770 ◽  
Author(s):  
Mohamed A. Safan
Keyword(s):  
Shear Strength ◽  
Concrete Beams ◽  
Structural Performance ◽  
Test Results ◽  
Self Compacting Concrete ◽  
Coarse Aggregates ◽  
Shear Loads ◽  
Test Parameters ◽  
Cracking Pattern ◽  
The Cost

An experimental investigation was conducted to evaluate the shear strength provided by different self-compacting concrete mixes proportioned using different fillers and coarse aggregates. A total of 28 simple beams without shear reinforcement were tested in flexure. The test parameters included the use of gravel versus crushed dolomite as coarse aggregates, the amount of longitudinal reinforcement, and the composition and percentage of fillers. Dolomite stone powder with either silica fume or fly ash was used as fillers replacing cement aiming at reducing the cost of the mix and obtaining better performance. The test results indicated that the overall structural performance in terms of cracking pattern and shear strength was comparable in all mixes. While the dolomite beams sustained higher ultimate shear loads, the normalized shear strength of most of the gravel beams were higher compared to their dolomite counterparts due to the capability of gravel beams to develop interlocking mechanisms and post-cracking shear resistance compensating the influence of the lower compressive strength.

scholarly journals Shear strength evaluation of reinforced recycled aggregate concrete beams

2021 ◽  
Author(s):  
Roya Shoghi Haghdoost
Keyword(s):  
Shear Strength ◽  
Shear Capacity ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Shear Behaviour ◽  
Strength Prediction ◽  
Shear Reinforcement ◽  
Aggregate Concrete ◽  
Ann Models ◽  
Shear Reinforcements

A theoretical study is conducted to investigate the shear behaviour of recycled aggregate concrete (RAC) beams with and without shear reinforcements along with the performance evaluation various Code based/other existing equations in predicting shear strength. In addition, three artificial neural network (ANN) models for shear strength prediction of RAC beams with and without shear reinforcements are developed and their performance validated by using 108 beams from available research studies. Most of the Codes and existing methods underestimate the shear capacity of RAC beams with/without shear reinforcement. However, over estimation of shear strength by Codes/existing methods for about 10% RAC beams needs to be addressed when using such Codes/existing methods for shear strength prediction. All three ANN models are found to predict shear strength of RAC beams. Developed ANN models are able to simulate the effect of shear reinforcement on the shear strength of RAC beams.

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