scholarly journals Performance of Fiber Self Compacting Concrete at High Temperatures

2021 ◽  
Vol 7 (12) ◽  
pp. 2083-2098
Author(s):  
Helal Hameed Yahy AL-Radi ◽  
Shen Dejian ◽  
Hussein Kareem Sultan
Keyword(s):  
High Temperatures ◽  
Steel Fibers ◽  
Test Results ◽  
Self Compacting Concrete ◽  
Hybrid Fibers ◽  
Weight Losses ◽  
Concrete Mixtures ◽  
Increasing Temperature ◽  
Passing Ability ◽  
The Impact

The goal of this study is to assess the fresh and hardened properties of self-compacting concrete (SCC) prepared using locally available materials. This research includes also the impact of polypropylene (PP), steel and hybrid fibers on the same properties. In addition, the mechanical properties of SCC specimens (with and without fibers) at high temperatures, including as compressive, tensile, and flexural strengths, will be determined. Four different SCC mixtures (with and without fibers) are prepared, tested, and assessed in order to attain these goals. The specimens were heated to various temperatures (200, 400, 600, and 800) at a rate of 5 degrees Celsius per minute for each test. The temperature was remained constant at the target temperature for one hour before cooling to ensure a consistent temperature throughout the specimen. According to the test results, all of the mixes have good consistency and workability in terms of filling and passing ability. In addition, the inclusion of fibers lowered the workability of SCC slightly. Also, the compressive, tensile, and flexural strengths improved with increasing temperature up to 200 °C and dropped at temperatures over 200 °C, according to these findings. Within the SCC, the PP fibers lowered and removed the risk of spalling. Concrete mixtures containing steel fibers and hybrid fibers have the finest mechanical characteristics and spalling resistance as temperature rises. Weight losses were lower in SCC mixtures with PP and steel fibers than in those without PP and steel fibers. As the temperature rose, all SCC mixes lost mass and UPV decreased until the samples spalled (as in plain SCC and SCC with steel fibers) or were questionable (as in SCC with PP and SCC with hybrid fibers). Doi: 10.28991/cej-2021-03091779 Full Text: PDF

scholarly journals Impact Performance of Steel Fiber-Reinforced Self-Compacting Concrete against Repeated Drop Weight Impact

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 91
Author(s):  
Sallal R. Abid ◽  
Murali Gunasekaran ◽  
Sajjad H. Ali ◽  
Ahmed L. Kadhum ◽  
Thaar S. Al-Gasham ◽  
...  
Keyword(s):  
Steel Fiber ◽  
Impact Resistance ◽  
High Strength ◽  
Steel Fibers ◽  
Test Results ◽  
Fiber Reinforced ◽  
Self Compacting Concrete ◽  
Impact Performance ◽  
Free Falling ◽  
The Impact

The self-compacting concrete (SCC) was invented to overcome the compaction problems in deep sections, owing to its perfect workability characteristics. Steel fibers when used with SCC would affect the required fluidity characteristics but improve its impact resistance. In this research, an experimental work was conducted to evaluate the impact response of micro-steel fiber-reinforced SCC, under flexural impact. A 5.47 kg free-falling mass was dropped repeatedly from 100 mm height on the top center of 270 mm-length beam specimens. Eight mixtures with two design grades of 30 and 50 MPa were prepared to distinguish the normal and high-strength SCCs. The distinguishing variable for each design grade was the fiber content, where four volumetric contents of 0%, 0.5%, 0.75%, and 1.0% were used. The test results showed that the impact resistance and ductility were significantly improved due to the incorporation of micro-steel fibers. The percentage improvements were noticeably higher at failure stage than at cracking stage. For the 30 MPa mixtures, the maximum percentage improvements at cracking and failure stages were 543% and 836%, respectively. Weibull’s linear correlations with R2 values of 0.84 to 0.97 were obtained at the failure stage, which meant that the impact failure number followed the Wiebull distribution.

scholarly journals Mechanical Properties of Steel Fibers and Nanosilica Modified Crumb Rubber Concrete

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Yihong Wang ◽  
Jiawei Chen ◽  
Danying Gao ◽  
E. Huang
Keyword(s):  
Mechanical Properties ◽  
Steel Fiber ◽  
Crumb Rubber ◽  
Steel Fibers ◽  
Test Results ◽  
Environment Friendly ◽  
Modified Method ◽  
Concrete Mixtures ◽  
Crumb Rubber Concrete ◽  
Rubber Concrete

Crumb rubber concrete (CRC) is an environment-friendly material using crumb rubber as a composition of cement concrete. It provides an alternative method for recycling of waste tires scientifically. CRC exhibits numerous advantages compared to ordinary concrete. However, the application of CRC is limited due to its low compressive and tensile strengths. This paper puts forward a new modified method by adding steel fibers and nanosilica in CRC. Material properties’ testing of eighteen concrete mixtures was investigated, considering different strength grades of CRC and crumb rubber contents. In addition, four different steel fiber contents (0%, 0.5%, 1.0%, and 1.5%) and three different nanosilica content (0%, 1%, and 2%) were taken into consideration. The brittle failure of the CRC can be improved and the mechanical properties can be enhanced according to the test results. More importantly, the modified CRC with 1.0% steel fiber content has relatively high compressive and splitting tensile strengths. Furthermore, the noncompactness of CRC can be effectively improved by nanosilica, enhancing the efficiency of steel fibers simultaneously. Finally, the failure mechanism of the modified CRC is discussed in this paper.

Fresh Properties of Self-Compacting Concrete with Coarse Recycled Aggregate

2012 ◽  
Vol 602-604 ◽  
pp. 938-942 ◽  
Author(s):  
Wai Ching Tang
Keyword(s):  
Coarse Aggregate ◽  
Fresh Concrete ◽  
Cement Content ◽  
Recycled Aggregate ◽  
Test Results ◽  
Fresh Properties ◽  
Self Compacting Concrete ◽  
Coarse Aggregates ◽  
Filling Ability ◽  
Passing Ability

In this paper, the fresh properties of self-compacting concrete (SCC) using recycled coarse aggregate (RCA) were evaluated. Five types of SCC mixtures were made, where the percentage of substitution of natural coarse aggregate by RCA was 0, 25, 50, 75 and 100%. The cement content, water to binder (W/B) ratio and Superplasticizer dosage were kept the same for all mixes. The effects of RCA on the key fresh properties such as filling ability, passing ability, and segregation resistance of SCC were investigated by conducting several fresh concrete tests included slump-flow, L-box, and sieve stability tests. The overall test results suggest that RCA can be used to produce SCC substituting up to 100% natural coarse aggregates without affecting the key fresh properties of concrete.

Experimental Study on the Shear Behavior of Fiber Reinforced Self-Compacting Concrete Rectangular Beams

2014 ◽  
Vol 934 ◽  
pp. 65-70
Author(s):  
Zhi Guo You ◽  
Yun Long Zhou ◽  
Long Chao Yang ◽  
Peng Wang
Keyword(s):  
Failure Mode ◽  
Steel Fiber ◽  
Concrete Beams ◽  
Steel Fibers ◽  
Shear Load ◽  
Experiment Study ◽  
Hybrid Fiber ◽  
Self Compacting Concrete ◽  
Hybrid Fibers ◽  
Better Than

The main purpose of this paper is the analysis of the influence of steel fiber and hybrid fiber on the ultimate shear load and failure mode of rectangular concrete beams. The results of this experiment study indicate that fibers can enhance the ultimate shear load. Hybrid fibers can change the failure mode. The mechanical behavior of beam with hybrid fibers is better than that with mono-steel fibers.

scholarly journals The effect of varied types of steel fibers on the performance of self-compacting concrete modified with volcanic pumice powder

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Hassan M. Magbool ◽  
Abdullah M. Zeyad
Keyword(s):  
Steel Fiber ◽  
Volume Fraction ◽  
Steel Fibers ◽  
Fiber Types ◽  
Self Compacting Concrete ◽  
Split Tensile Strength ◽  
Fiber Properties ◽  
Hardened Properties ◽  
Pointed End ◽  
The Impact

Abstract The aim of this work involves studying the impact of varied types of steel fibers (SF) on the performance of self-compacting concrete (SCC), containing volcanic pumice powder (VPP). In this study, five types of steel fiber, which had a hooked end with two lengths of (SF1) and (SF3), flat end of length (SF2), in addition to the pointed end of (SF4) and (SF5) by 1% of volume fraction, were used. In addition, hybrid steel fiber (a mixture of all the steel fiber types) by 0.2% of volume fraction of concrete volume was used. Moreover, VPP was utilized by 30% cement mass as a substitute material for producing SCC. The impact of steel fiber properties in the shape of SF on the fresh concrete properties as slump flow and segregation were investigated. In addition to their influence on the compressive strength, split tensile strength, flexural strength, toughness, porosity, water absorption, and bulk density were examined. The results showed that SF led to decreasing the SCC fresh properties. Utilizing SF, on the other hand, improved the SCC hardened properties, as well as the toughness indices.

scholarly journals Using the Plate-Creep test to determine the impact strength properties of concrete

2021 ◽  
Author(s):  
Murat Gökçe ◽  
Keyword(s):  
Impact Strength ◽  
Creep Test ◽  
Impact Test ◽  
Impact Resistance ◽  
Strength Properties ◽  
Test Results ◽  
Test Device ◽  
Concrete Mixtures ◽  
Repetitive Impact ◽  
The Impact

The paper aims to design a concrete against repetitive impact and abrasion resistance. Macro/micro steel fibers and two types of crushed stone based on limestone and corundum as aggregate were used in concrete mixtures. Impact test device has been modified, designed and used for impact strength testing of concrete. The usability of the plate creep test in determining the impact strength of concrete was also investigated. According to the test results, a high correlation was found between the abrasion, impact resistance tests and the creep test.

Effects of different size of fly ash as cement replacement on self-compacting concrete properties

2019 ◽  
Vol 1 (2) ◽  
pp. 180-186
Author(s):  
Dilan Rantung ◽  
Steve W.M. Supit ◽  
Seska Nicolaas
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Fly Ash ◽  
Building Construction ◽  
Particle Sizes ◽  
Self Compacting Concrete ◽  
Cement Replacement ◽  
Concrete Mixtures ◽  
Water Curing ◽  
Passing Ability

This paper aims to investigate experimentally the influence of replacing cement with different fineness of fly ash based on flowability, passing ability, compressive strength, tensile strength (splitting). Concretes with 15% fly ash (passed a number 100 sieve) and fine fly ash (passed a number 200 sieve) as cement replacement were cast and tested at 7, 14, 28 days after water curing. A superplasticizer in the form of viscocrete 3115 N was constantly used for each concrete mixtures as much as 1% by weight of cement. The results show that the use of fly ash does not significantly increased the compressive strength and tensile strength of SCC mixtures. However, concrete with 15% fine fly ash its self and combined 7.5% fly ash with 7.5% fine fly ash show better flowability and passing ability when compared to concrete with cement only indicating the performance of using smaller particle sizes of fly ash could lead better properties of SCC that can be potentially used for building construction application.

scholarly journals Properties of steel-polypropilene hybrid fibers reinforced concrete

2021 ◽  
Vol 19 (3) ◽  
pp. 235-244
Author(s):  
Nenad Ristic ◽  
Dusan Grdic ◽  
Jelena Bijeljic ◽  
Zoran Grdic ◽  
Gordana Toplicic-Curcic
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
Steel Fibers ◽  
Concrete Mixture ◽  
Polypropylene Fibers ◽  
Test Results ◽  
Hybrid Fibers

This paper present the results of mechanical properties of hybrid reinforced concrete made by adding polypropylene and steel fibers into concrete mixture. For the testing purposes were used steel fibers with hooked ends and monofilament polypropylene fibers. The total of 5 batches of concrete were made: concrete with addition of steel fibers, polypropylene fibers and their combination in amount of 0,5 % of the concrete volume. The test results show that concretes made by adding of 0.4% steel and 0.1% polypropylene fibers have better performance compared to other concretes.

scholarly journals Impact of using Recycled Demolition waste as Aggregates in Steel Fiber Reinforced Self-compacting Concrete on its Sulphate Resistance

2021 ◽  
Vol 889 (1) ◽  
pp. 012064
Author(s):  
Anurag ◽  
S.K Singh
Keyword(s):  
Laboratory Experiments ◽  
Steel Fiber ◽  
Steel Fibers ◽  
Fiber Reinforced ◽  
Self Compacting Concrete ◽  
Demolition Waste ◽  
Natural Aggregates ◽  
The Impact ◽  
Central Composite ◽  
Control Samples

Abstract The objective of performing this study was to estimate the impact of replacement of natural aggregates (NAs) with the recycled demolition waste aggregates (rDWAs) on the sulphate resistance of steel fiber-reinforced self-compacting concrete (FRSCC). In this regard, 13 laboratory experiments were conducted and analyzed using central composite design (CCD) in combination with response surface methodology (RSM). The sulphate resistance was evaluated in the form of % reduction is compressive strength (CS) of the FRSCC samples after 28 days, 90 days and 120 days. It was revealed that after 28 days, 90 days and 120 days the % reduction in CS was 97%, 14.85% and 8.6% more than the control samples, respectively. Also, the % reduction in CS of the FRSCC samples showed a linear relation with both the process parameters i.e., % replacement of NAs with rDWAs and % dosage of steel fibers. The findings of this study are expected to encourage the reuse of rDWAs in FRSCC-based structures.

Sign in / Sign up

Export Citation Format

Share Document