scholarly journals Effect of Coarse Aggregate Size on Shear Behavior of Self-Compacting Concrete and Conventional Concrete Beams

2018 ◽  
Vol 7 (4.20) ◽  
pp. 359 ◽  
Author(s):  
Murtada A. Ismael ◽  
Haitham J. Abd ◽  
Adham A. Hameed
Keyword(s):  
Compressive Strength ◽  
Coarse Aggregate ◽  
Concrete Beams ◽  
High Strength ◽  
Maximum Size ◽  
Shear Behavior ◽  
Experimental Program ◽  
Self Compacting Concrete ◽  
Ultimate Shear Strength ◽  
Conventional Concrete

This research presents an experimental study to investigate the effect of coarse aggregate maximum size on the shear behavior of self-compacting concrete (SCC) and conventional concrete (CC) slender beams having the same compressive strength and make a comparison between the shear behavior of concrete beams. The experimental program included casting and testing eight beams with a constant size of 150mm height ×125mm width×1000mm length. Two coarse aggregate maximum sizes were used (10mm and 20mm) with SCC and CC in normal and high strength concrete. The results showed that increasing the coarse aggregate maximum size from 10mm to 20mm results in a slight increase in the diagonal cracking load and ultimate shear strength of SCC beams, while for CC beams the result was more significant. Also, it was found that the effect of increasing the coarse aggregate maximum size was more significant for normal strength as compared with high strength beams for both concrete types. Furthermore, the comparison between the shear behavior of SCC and CC beams having the same compressive strength and a concrete with the same coarse aggregate maximum size revealed that the SCC exhibited less diagonal cracking load and less ultimate strength compared with CC.   

scholarly journals Kajian Karakteristik Beton Memadat Sendiri yang Menggunakan Serat Ijuk (Hal. 54-65)

2018 ◽  
Vol 4 (4) ◽  
pp. 54
Author(s):  
Iis Nurjamilah ◽  
Abinhot Sihotang
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Flexural Strength ◽  
Coarse Aggregate ◽  
Fresh Concrete ◽  
High Strength ◽  
Self Compacting Concrete ◽  
Palm Fiber ◽  
Fiber Concrete ◽  
Dilute Mixture

ABSTRAKKajian karakteristik beton memadat sendiri yang menggunakan serat ijuk merupakan sebuah kajian yang dilakukan untuk mengetahui pengaruh penambahan serat ijuk terhadap karakteristik beton memadat sendiri (SCC). Beton memadat sendiri yang menggunakan serat ijuk (PFSCC) didesain memiliki campuran yang encer, bermutu tinggi (= 40 MPa) dan memiliki persentase kekuatan lentur yang lebih baik. PFSCC  didapatkan dari hasil pencampuran antara semen sebanyak 85%, fly ash 15%, superplastizicer 1,5%, serat ijuk 0%, 0,5%; 1%; 1,5%; 2% dan 3% dari berat binder (semen + fly ash), kadar air 190 kg/m3, agregat kasar 552,47 kg/m3 dan pasir 1.063 kg/m3. Semakin banyak persentase penambahan serat ijuk ke dalam campuran berdampak terhadap menurunnya workability beton segar. Penambahan serat ijuk yang paling baik adalah sebanyak 1%, penambahan tersebut dapat meningkatkan kekuatan tekan beton sebesar 13% dan lentur sebesar 1,8%.Kata kunci: beton memadat sendiri (SCC), beton berserat, beton memadat sendiri yang menggunakan serat ijuk (PFSCC), serat ijuk ABSTRACTThe study of characteristics self compacting concrete using palm fibers is a study conducted to determine the effect of adding palm fibers to characteristics of self compacting concrete (SCC). palm fibers self compacting concrete (PFSCC) is designed to have a dilute mixture, high strength (= 40 MPa), and have better precentage flexural strength. PFSCC was obtained from mixing of 85% cement, 15% fly ash, 1.5% superplastizicer, 0%, 0.5%, 1%, 1.5%, 2% and 3% palm fibers from the weight of binder  (cement + fly ash), water content 190 kg/m3, coarse aggregate 552.47 kg/m3 and sand 1,063 kg/m3. The more persentage palm fibers content added to the mixture makes workability of fresh concrete decreases. The best addition of palm fiber is 1%, this addition can increases the compressive strength 13% and flexural strength 1.8%.Keywords: self compacting concrete (SCC), fiber concrete, Palm fiber self compacting concrete (PFSCC), palm fiber

Analytical Study and Laboratory Tests for Investigating the Application of Polymer for Achieving High Strength Concrete

2019 ◽  
Vol 27 ◽  
pp. 39-51
Author(s):  
Kamrun N. Keya ◽  
Alamgir Habib ◽  
Sampa Akhter ◽  
Hasan M. Tamim ◽  
Maksuda Akhter
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Epoxy Resin ◽  
Construction Material ◽  
High Strength ◽  
Experimental Program ◽  
Polymer Concrete ◽  
Conventional Concrete ◽  
Polymer Resin ◽  
Adequate Quality

Polymer concrete is one kind of which is used as an additive of the binding material. Due to their high thermal stability, tensile and flexural strengths, high compressive strength and resistance to chemical, its popularity increasing rapidly and which is now widely used as a construction material. This paper explores a research study that has been establishing a standard correlation between concrete compressive strength with the amount of polymers and other ingredients. Hence a comparison was made between the conventional concrete and polymer concrete. As per ASTM C31, the mix design of polymer concrete is calculated and estimated the material quantity. In this research, a total of twenty-two trail mixes of polymer concrete were prepared with different amount of epoxy resin and hardener. In implementation of experimental program compressive strength test was performed for conventional concrete, polymer resin (epoxy resin) concrete with resin percentage 10%, 12%, 15%, 17% and 20% was performed and compared the results with polymer concrete (no-fly ash) with polymer concrete (fly ash) percentage 15%. It was found that the compressive strength of the polymer concrete was increased with increasing the percentage of a polymer. Compressive strength of the 17% and 20% polymer resin-based polymer concrete was 46.75 MPa and 48.32 MPa and cost was around 1,17,110.00 TK and 1,37,152.00 TK; respectively and also it was observed that by using fly ash the strength of the concrete could be increased significantly. It can be said that higher strength can be achieved with a comparatively high cost. However, the cost can be reduced by proper materials selection, mix ratio, curing and adequate quality control of the material.

Influence of synthetic fibers on the shear behavior of lightweight concrete beams

2017 ◽  
Vol 20 (11) ◽  
pp. 1671-1683 ◽  
Author(s):  
Ayman Ababneh ◽  
Rajai Al-Rousan ◽  
Mohammad Alhassan ◽  
Mohammed Alqadami
Keyword(s):  
Shear Strength ◽  
Lightweight Concrete ◽  
Concrete Beams ◽  
Shear Behavior ◽  
Fiber Content ◽  
Reinforced Concrete Beams ◽  
Experimental Program ◽  
Shear Reinforcement ◽  
Ultimate Shear Strength ◽  
Synthetic Fibers

Incorporating discontinuous structural synthetic fibers in general enhances the performance of concrete and increases its durability by minimizing its potential to cracking and providing crack arresting mechanism. Synthetic fibers are non-corrosive, alkali resistant, simple to apply, and added in small quantities due to their low density; thus, a substantial number of uniformly distributed fibers are added. In this research, an experimental program was undertaken to investigate the shear behavior of lightweight concrete beams containing discontinuous structural synthetic fibers. The studied parameters include fiber content and shear reinforcement. The tests were conducted under four-point loading in a simply supported span of 0.85 m. The beams were divided into three groups based on shear reinforcement. Group 1 was designed without shear reinforcement, Group 2 with closed vertical stirrups placed at d/4 spacing (where d is the effective depth), and Group 3 with closed vertical stirrups placed at d/2 spacing. Each group contains four identical specimens except in terms of the fiber content: 0, 3, 5, and 7 kg/m3 equivalent to fiber volume fractions of 0%, 0.33%, 0.55%, and 0.77%, respectively. The experimental results showed that the discontinuous structural synthetic fibers improve the ultimate shear strength, ductility, stiffness, and toughness of lightweight concrete beams significantly. Therefore, design codes are encouraged to consider their contribution to shear strength and revise the maximum stirrups spacing when discontinuous structural synthetic fibers are used. The results also showed that addition of discontinuous structural synthetic fibers reduces the crack width of lightweight reinforced concrete beams. The effectiveness of the discontinuous structural synthetic fibers decreases as the stirrups spacing decreases.

scholarly journals Experimental investigation on shear resistance of self-consolidating concrete beams

2019 ◽  
Vol 12 (6) ◽  
pp. 1305-1326 ◽  
Author(s):  
G. SAVARIS ◽  
R. C. A. PINTO
Keyword(s):  
Coarse Aggregate ◽  
Concrete Beams ◽  
Aggregate Size ◽  
Shear Capacity ◽  
Design Codes ◽  
Test Program ◽  
Self Compacting Concrete ◽  
Ultimate Shear Strength ◽  
Self Consolidating Concrete ◽  
Concrete Mixtures

Abstract Self-consolidating concrete stands out for its high fluidity and stability, which are obtained by the reduction of the coarse aggregate dimensions and content in the mixture and also by the addition of superplasticizer and viscosity modifiers. An experimental test program was carried out to evaluate the influence of these particularities of self-consolidating concrete mixtures on the shear capacity of beams with shear reinforcement. Four mixtures of self-compacting concrete and two mixtures of conventionally vibrated concrete with different coarse aggregate size and volume were used for the production of beams to be tested under flexure. The experimental results were compared to those estimated by the ACI-318, CAN A23.3, EC-2 and NBR 6118 design codes. The results demonstrated that the reduction of coarse aggregate dimensions and content in self-compacting concrete mixture did not significantly influence the ultimate shear strength. The shear strengths obtained experimentally were considered adequate to codes estimates, for both concrete types.

scholarly journals OPTIMIZATION MIX PROPORTION FOR ULTRA HIGH STRENGTH SELF COMPACTING CONCRETE

2010 ◽  
Vol 13 (2) ◽  
pp. 5-15
Author(s):  
Hoang Huy Kim ◽  
Vinh Duc Bui ◽  
Manh Van Tran ◽  
Tri Son Ha
Keyword(s):  
Compressive Strength ◽  
Coarse Aggregate ◽  
High Strength ◽  
Fine Aggregate ◽  
Concrete Composition ◽  
Self Compacting Concrete ◽  
River Sand ◽  
Filling Ability ◽  
Mix Proportion ◽  
Passing Ability

Ultra high strength self compacting concrete (UHSSCC) with high filling ability, passing ability, segregation resistance and ultra high compressive strength have been used in many modern construction project. This paper represents the optimization of concrete composition for ultra high strength self compacting concrete, ỉn this experiment, river sand and crush stone were used as fine aggregate, Dmax of coarse aggregate is 10 mm. The study show that slump flow was 525 mm up to 850 mm and compressive strength was 140 MPa up to 170 MPa.

scholarly journals Effect of Maximum Aggregate Size on the Strength of Normal and High Strength Concrete

2020 ◽  
Vol 6 (6) ◽  
pp. 1155-1165
Author(s):  
Gaith Abdulhamza Mohammed ◽  
Samer Abdul Amir Al-Mashhadi
Keyword(s):  
Compressive Strength ◽  
High Strength Concrete ◽  
Coarse Aggregate ◽  
Design Method ◽  
High Strength ◽  
Maximum Size ◽  
Normal Strength Concrete ◽  
Normal Concrete ◽  
Strength Concrete ◽  
Normal Strength

Aggregates form 60% to 75% of concrete volume and thus influence its mechanical properties. The strength of (normal or high-strength) concrete is affected by the maximum size of a well-graded coarse aggregate. Concrete mixes containing larger coarse aggregate particles need less mixing water than those containing smaller coarse aggregates, In other words, small aggregate particles have more surface area than a large aggregate particle. In this research, about twenty-two mixtures were covered to study the effect of the MSCA, on compressive strength of (normal strength concrete) and Sixteen mixtures to study the effect of the maximum size of coarse aggregate on compressive strength for (high strength concrete). The concrete mixture is completely redesigned according to the maximum size of coarse aggregate needs and maintaining uniform workability for all sizes of coarse aggregate. The American design method was adopted ACI 211.1, for normal concrete. ACI 211-4R, the design method was adopted for high strength concrete. And use the MSCA with dimensions (9.5, 12.5, 19, 25, 37.5, and 50) mm for normal strength concrete and the MSCA (9.5, 12.5, 19, and 25) mm for high strength concrete. The slump was fixed (75-100) mm for normal strength concrete. Slump is fixed to (25-50) mm for high strength concrete before added Superplasticizer high range water reducer (HRWR). With Fineness Modulus (F.M) fixed to 2.8 for both normal concrete and high-strength concrete. According to the results of the tests, the compressive strength increases with the increase in the MSCA, of the normal concrete and also high – strength concrete. And the effect of the MSCA, on the compressive strength of normal concrete, is higher than that of high-strength concrete.

scholarly journals The Effect of Styrofoam Artificial Lightweight Aggregate (ALWA) on Compressive Strength of Self Compacting Concrete (SCC)

2018 ◽  
Vol 4 (9) ◽  
pp. 2111 ◽  
Author(s):  
Dhiafah Hera Darayani ◽  
Tavio Tavio ◽  
I G. P. Raka ◽  
Puryanto Puryanto
Keyword(s):  
Compressive Strength ◽  
Modulus Of Elasticity ◽  
Coarse Aggregate ◽  
Lightweight Aggregate ◽  
Structural Members ◽  
Self Compacting Concrete ◽  
Conventional Concrete ◽  
Concrete Material ◽  
Compressive Strength Test ◽  
The Impact

Self-compacting concrete (SCC) is a fresh concrete that is able to flow and fill up the formwork by itself without the need of a vibrator to compact it. One of the reasons that causes the damage of a building structure during an earthquake is the heavy weight of its structural members which are from the high density of the material used such concrete material. Lightweight aggregate is one of the solutions to reduce the weight of the structure. Therefore, the SCC using the artificial lightweight aggregate (ALWA) is one of the solutions to reduce the self-weight (dead load) of a structure. This research was conducted to investigate the impact of the use of ALWA in conventional concrete and SCC in terms of its compressive strength and modulus of elasticity. To study the impact of the use of ALWA in SCC, several variation of percentage of ALWA as a substitution to the natural coarse aggregate was examined. The proportions of ALWA as a replacement to the coarse aggregate were 0%, 15%, 50%, and 100%. The test specimens were the cylindrical concrete of 200 mm in height and 100 mm in diameter for both compressive strength and modulus of elasticity tests. The results of the compressive strength test indicated that the higher the percentage of ALWA used in SCC, the lower the compressive strength of the concrete. The addition of ALWA as a substitution to the natural coarse aggregate to conventional concrete and SCC was found optimum at 15% replacement with the compressive strength of conventional concrete and SCC of 21.13 and 28.33 MPa, respectively. Whereas, the modulus of elasticity of the conventional concrete and SCC were found to be 20,843.99 and 23,717.77 MPa, respectively.

scholarly journals Behavior Of A Confined Tension Lap Splice In High-Strength Reinforced Concrete Beams

2015 ◽  
Vol 23 (3) ◽  
pp. 1-8 ◽  
Author(s):  
Ahmed H. Abdel-Kareem ◽  
Hala Abousafa ◽  
Omaia S. El-Hadidi
Keyword(s):  
Compressive Strength ◽  
High Strength Concrete ◽  
Concrete Beams ◽  
High Strength ◽  
Experimental Results ◽  
Experimental Program ◽  
Transverse Reinforcement ◽  
Displacement Ductility ◽  
Lap Splice ◽  
Strength Concrete

Abstract The results of an experimental program conducted on seventeen simply supported concrete beams to study the effect of transverse reinforcement on the behavior of the lap splice of a steel reinforcement in tension zones in high-strength concrete beams are presented. The parameters included in the experimental program were the concrete compressive strength, the lap splice length, the amount of transverse reinforcement provided within the splice region, and the shape of the transverse reinforcement around the spliced bars. The experimental results showed that the displacement ductility increased and the mode of failure changed from a splitting bond failure to a flexural failure when the amount of the transverse reinforcement in the splice region increased, and the compressive strength increased up to 100 MPa. The presence of the transverse reinforcement around the spliced bars had a pronounced effect on increasing the ultimate load, the ultimate deflection, and the displacement ductility. The prediction of maximum steel stresses for spliced bars using the ACI 318-05 building code was compared with the experimental results. The comparison showed that the effect of the transverse reinforcement around spliced bars has to be considered into the design equations for lap splice length in high-strength concrete beams.

The Mechanical Properties Study of Waste Bakelite Aggregate Concrete

2017 ◽  
Vol 751 ◽  
pp. 570-577
Author(s):  
Nopagon Usahanunth ◽  
Waranon Kongsong ◽  
Seree Tuprakay ◽  
Sirawan Ruangchuay Tuprakay ◽  
Suppachai Sinthaworn ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Coarse Aggregate ◽  
Equation Model ◽  
Recycled Aggregate ◽  
Experimental Program ◽  
Chemical Extraction ◽  
Plastic Pollution ◽  
Conventional Concrete ◽  
Aggregate Concrete

This paper focuses on industrial thermosetting plastic waste reduction by recycling as the material for natural coarse aggregate replacement in concrete. This substitution of aggregate is an integration approach to preserve the natural resources and environment as well as develop the alternative recycled aggregate material to meet 3R principle and sustainable development. Bakelite waste is prohibited from disposing of sanitary landfill and direct burning because of hazardous disposal and emission reasons .There are many studies of plastic aggregate to substitute natural coarse aggregate especially PET and PE aggregate. However, there is no study of Waste Bakelite Aggregate (WBA) mixed in concrete in Thailand. This study aim is investigating the mechanical properties of Waste Bakelite Aggregate Concrete (WBAC) compare to conventional concrete (CC).The methodology is based on an experimental program by testing of concrete specimens. The data obtained from sample test according to BS standard. These test results present compressive strength of all samples both CC and WBAC. The relationship charts between mechanical properties and the waste Bakelite aggregate replacement percentage will be illustrated including the compressive strength predictable equation model. Furthermore, the chemical extraction test of waste Bakelite aggregate concrete and the durability of WBAC are notified for the utilization. WBAC is an alternative material that can be applied to the non-structural concrete product to replace the natural aggregate and helpful in waste plastic pollution mitigation.

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