Workability Evaluation of Self Compacting Concrete

2010 ◽  
Vol 44-47 ◽  
pp. 2359-2363 ◽  
Author(s):  
Li Jiu Wang ◽  
Xin Gu ◽  
Min Hu
Keyword(s):  
Quality Control ◽  
Assessment Methods ◽  
Ring Test ◽  
Self Compacting Concrete ◽  
Evaluation Practice ◽  
Advantages And Disadvantages ◽  
Slump Flow ◽  
Flow Test ◽  
Segregation Stability

The compactibility, mobility and segregation stability of self compacting concrete (SCC) is essential for its quality control. Completely and reasonably workability evaluation to SCC has an obviously influence in concrete engineering field. The paper introduced the rheology and workability mechanism of SCC. Ten workability assessment methods, such as Slump Flow test, U-box test, J-ring test, L-box test, VSI method, Oriment test, V-funnel test, Inverted Slump Cone test, were presented and the advantages and disadvantages of each appraisal procedure and the evaluation practice were analyzed. It also put forward the prospect direction of workability evaluation of SCC.

Research on the Working Performance of Self-Compacting Concrete at Different Substitution Rates of Iron-Tailings

2014 ◽  
Vol 1065-1069 ◽  
pp. 1930-1933
Author(s):  
Pei Xiang He ◽  
Bing Liu ◽  
Sheng Hu
Keyword(s):  
Ring Test ◽  
Self Compacting Concrete ◽  
Natural Sand ◽  
Substitution Rates ◽  
Mix Proportioning ◽  
Slump Flow ◽  
Flow Test ◽  
Reasonable Range ◽  
The Common ◽  
Working Performance

In this paper, iron-tailings was substituted for natural sand in self-compacting concrete(SCC). Iron-tailings SCC mix proportioning design at different substitution rates were made. Slump,slump-flow, the time T500(S) of the slump-flow reaching 500mm, J-ring test, U-flow test were used to evaluate the iron-tailings SCC mixture working performances at different substitution rates, which contrast to the common SCC working performances. Through the experimental results and their variation regulations, taking the single working performance into consideration,a reasonable range about the substitution rate of iron-tailings is obtained.

scholarly journals Study on Adaptability of Test Methods for Workability of Fresh Self-Compacting SFRC

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5312
Author(s):  
Xinxin Ding ◽  
Haibin Geng ◽  
Kang Shi ◽  
Li Song ◽  
Shangyu Li ◽  
...  
Keyword(s):  
Steel Fiber ◽  
Volume Fraction ◽  
Test Methods ◽  
Fiber Reinforced Concrete ◽  
Ring Test ◽  
Steel Fiber Reinforced Concrete ◽  
Slump Flow ◽  
Filling Ability ◽  
Flow Test ◽  
Passing Ability

To ensure the quality of concrete construction, the workability of fresh mix measured by rational test methods is critical to be controlled. With the presence of steel fibers, whether the test methods and evaluation indices of fresh self-compacting concrete (SCC) are adaptable for self-compacting steel fiber reinforced concrete (SFRC) needs to be systematically verified. In this paper, seven groups of self-compacting SFRC, referenced with one group SCC, were prepared by using the mix proportion design method based on the steel fiber-aggregates skeleton packing test. The main factors included the volume fraction and the length of hooked-end steel fiber. Tests for filling ability, passing ability, and stability of fresh self-compacting SFRC and SCC were carried out. Results indicate that the adaptability was well for the slump-flow test with indices of slump flow and flow time T500 to evaluate the filling ability, the J-ring flow test with an index of PA level to evaluate the passing ability, and the static segregation test with an index of static segregation resistance to evaluate the stability of fresh self-compacting SFRC. By the repeated tests and measurements, the slump cone should be vertically lifted off to a height of 300 mm within 3 s at a constant speed, the spacing of the rebar in the J-ring test should be adjusted to be two times the fiber length. If the table jumping test is used, the dynamic segregation percent should be increased to 35% to fit the result of the static segregation test. Good workability of the self-compacting SFRC prepared in this study is presented with the general evaluation of test results.

Mechanical Properties of Rubberized Self Compacting Concrete Containing Silica Fume

2011 ◽  
Vol 261-263 ◽  
pp. 441-445 ◽  
Author(s):  
Yousef Rahmani ◽  
Mohammad Reza Sohrabi ◽  
Ahmad Askari
Keyword(s):  
Mechanical Properties ◽  
Silica Fume ◽  
Coarse Aggregate ◽  
Fresh Concrete ◽  
Critical Issue ◽  
Crumb Rubber ◽  
Self Compacting Concrete ◽  
Waste Rubber ◽  
Slump Flow ◽  
Flow Test

The disposal of waste rubber produced each year is a critical issue for any country, because this material doesn't resolve easily and leads to more environmental pollution. Utilizing waste rubber in industry is an alternative for the disposal of this matter. In the present study 5%, 10% and 15% of coarse aggregate is replaced with crumb rubber by volume along with 5%, 10% and 15% silica fume as cement replacement by weight in self compacting concrete. There were several rheological tests carried out on fresh concrete such as slump flow test, T50, J-ring, L-box and V-funnel test. Mechanical properties of specimens were also examined; compressive strength at 7 and 28 days of curing and modulus of elasticity and density of hardened cylindrical specimens at 28 days of curing.

EFFECTS OF BAMBOO FIBERS AND LIMESTONE POWDER ON FRESH PROPERTIES OF SELF-COMPACTING CONCRETE

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Anthony Nkem Ede ◽  
Obatarhie Oshogbunu ◽  
Oluwarotimi Michael Olofinnade ◽  
Kayode Joshua Jolayemi ◽  
Solomon Olakunle Oyebisi ◽  
...  
Keyword(s):  
Coarse Aggregate ◽  
Particle System ◽  
Limestone Powder ◽  
Water Quantity ◽  
Cement Particle ◽  
Fresh Properties ◽  
Self Compacting Concrete ◽  
Slump Flow ◽  
Flow Test ◽  
Bamboo Fibers

Self-compacting concrete (SCC) flows through densely steel reinforced elements and consolidates under self-weight without need for vibration or compaction. This helps in complex and densely reinforced structures. The integration of fibers and fillers in concrete improves its general properties. The addition of fibers in particular can regulate the flow and workability of the concrete; hence, the high workable nature of SCC can be an ideal mix for the incorporation of fibers. This research investigates the effect of bamboo fibers and limestone powder on the fresh properties of self-compacting concrete. Bamboo fibers of an aspect ratio of 50 and varied volumes of 0.25%, 0.5%, 0.75% and 1% were adopted for this research. The workability of the mix was assessed by slump flow test and V-funnel test. For fiber volumes of 0.25%, 0.5%, 0.75%, it was observed that the coarse aggregate was evenly distributed across the spread, indicating good viscosity and stability of the mix. The presence of 10% percent limestone powder improved the workability of the concrete mix. This can be attributed to filler properties of limestone powder, which, affecting the cement particle system, changed the ordinary distance between them and modified the water quantity available for the hydration process. These results proved that the bamboo fiber and limestone powder can be sustainably adopted to regulate the flow-ability of SCC without compromising desired properties.

scholarly journals Effect of Basalt Fibers on the Properties of High Strength Self-Compacting Concrete.

2019 ◽  
Vol 9 (1) ◽  
pp. 3995-3998
Keyword(s):  
High Strength Concrete ◽  
High Strength ◽  
Basalt Fibers ◽  
Self Compacting Concrete ◽  
Split Tensile Strength ◽  
Strength Concrete ◽  
Aspect Ratios ◽  
Slump Flow ◽  
Flow Test ◽  
Hardened Properties

Concrete having characteristics strength of more than 65 MPa is categorized as high-strength concrete according to IS 456. The high strength concrete is more brittle compared to ordinary strength concrete and inclusion of fibers can increase the ductility of concrete. In the present study, high strength self-compacting concrete of characteristic strength of 90 MPa was developed as per the guidelines of EFNARC. Basalt fibers were considered to investigate its influence on the properties of high strength self compacting concrete. Three aspect ratios of 230, 530 and 600 were considered and are added in proportions of 0.1% and 0.4% by volume of concrete. The properties of concrete determine were fresh and hardened. Fresh properties such as slump flow test, V-funnel test, V-funnel T5 minutes and L-box test were determined as per EFNARC. Also, hardened properties such as compressive strength, split tensile strength and flexural strength were determined. A typical comparison on the effect of aspect ratio of basalt fibers and the dosage on the properties of concrete were determined. From the results, the optimum dosage of fibers was determined.

scholarly journals INVESTIGATION OF THE EFFECT OF BASALT FIBER ON SELF-COMPACTING CONCRETE

2018 ◽  
Vol 6 (12) ◽  
pp. 38-45
Author(s):  
Aylin Ozodabas
Keyword(s):  
Compressive Strength ◽  
Basalt Fiber ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Self Compacting Concrete ◽  
Slump Flow ◽  
Flow Test ◽  
Standard Values ◽  
Application Fields

Self-compacting concrete is used in many application fields in construction, repair, and maintenance, and reinforcement. Self-settling concretes are advantageous in terms of labor and speed. Self-compacting concrete samples compared to the amount of binder; blast furnace slag 10 % and 30 %, plasticizer additive 2.7 %, basalt fiber 1.6 % in samples A and 3.2% in samples B were used. But basalt fiber was not used in samples C. The plasticizing additive used was kept constant in all samples. Slump Flow Test, V-funnel, L-box, compressive strength, ultrasonic pulse velocity, water absorption and weight per unit of volume tests were performed and the obtained values were discussed in detail in the discussion and conclusion sections. It has been observed that the use of basalt fiber reduces the workability in fresh concrete but increased the compressive strength values. Samples basalt containing could not provide determined standard values for slump flow and V-funnel and L-box tests. As the use of basalt fiber increased, the viscosity in the concrete decreased. For the samples with 1% basalt fiber, the pressure strength values decreased by 0.5% compared to the samples with basalt fiber.

Production of Self-Compacting Concrete Using Rock Breaking Waste Residues

2013 ◽  
Vol 785-786 ◽  
pp. 157-162 ◽  
Author(s):  
Fabio Nascimento ◽  
Luisa Andréia Gachet-Barbosa ◽  
Rosa Cristina Cecche Lintz ◽  
Maria Rachel Russo Seydell
Keyword(s):  
Mechanical Performance ◽  
Rock Breaking ◽  
Strength Test ◽  
State Technical ◽  
Self Compacting Concrete ◽  
Slump Flow ◽  
Flow Test ◽  
Fresh State ◽  
Hard State ◽  
State Water

Waste residues derived from the breaking process of rocks have been many times inadequately discarded on the environment generating an environmental passive. The residues could be used in the production of self-compacting concrete (CAA) providing more sustainable constructions. To study different CAA mixtures the following tests have been performed in the fresh state: Water Absorption, L - Box, V - Funnel and Slump Flow Test. For the evaluation of mechanical performance, the concrete Compression Strength Test, Flexural Strength Test and Tensile Strength by Diametric Compression Test have been performed in the hard state. Technical and environmental viability in the addition of this type of residue for the studied percentages have been verified.

Advantages and Disadvantages of Nephelometric Measurement of Serum Lipids

1974 ◽  
Vol 20 (4) ◽  
pp. 502-504 ◽  
Author(s):  
Daniel M Baer
Keyword(s):  
Quality Control ◽  
Serum Lipids ◽  
Serum Triglyceride ◽  
Chemical Methods ◽  
Unstable Material ◽  
Advantages And Disadvantages ◽  
Control Procedures ◽  
Frequent Problem

Abstract Several technical difficulties diminish the usefulness of serum triglyceride estimation by the method of Stone and Thorp [Clin. Chim. Acta 14, 812 (1966)]. An artificial and somewhat unstable material is used in the standardization. Falsely elevated readings caused by scratched cuvettes are a frequent problem. Conventional quality-control procedures cannot be used because stable preparations are not available. Specimen stability is a greater problem than with conventional chemical methods. In spite of these difficulties, the method can be useful, if its limitations are recognized, in measurements made on nonfasting individuals.

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