An analysis of social and economic profiability of self-compacting concrete technology

2005 ◽  
Author(s):  
Z. Pan
Keyword(s):  
Self Compacting Concrete ◽  
Concrete Technology

Investigation and Application of High Performance Concretes

2010 ◽  
Vol 659 ◽  
pp. 517-521
Author(s):  
Viktória Sugár ◽  
Márton Takács ◽  
Vilmos Ovári
Keyword(s):  
Bulk Density ◽  
High Performance ◽  
Research Work ◽  
Hardened Concrete ◽  
Self Compacting Concrete ◽  
Concrete Technology ◽  
Normal Concrete ◽  
Air Content ◽  
The Mean

Recent research work of the authors is dealing with preparing, investigation and application of high performance concretes (HPC) produced by the mean of results of modern concrete technology. These special types of concrete have one or more outstanding properties conversely the normal concrete. This article is focusing on the results of the experiments regarding self compacting concrete (SCC). During the investigation, effects of the fine-graded fraction was studied, which is indispensable component of the SCC. The effects of bulk density, consistency, air content, compressive strenght were analysed on fresh and hardened concrete.

scholarly journals MICROSTRUCTURE CHARACTERISTIC AND COMPRESSIVE STRENGTH OF SELF COMPACTING CONCRETE USING SEA WATER AS MIXING WATER

2018 ◽  
Author(s):  
erniati ◽  
muhammad wihardi tjaronge ◽  
Rudy Djamaluddin ◽  
Victor Sampebulu
Keyword(s):  
Compressive Strength ◽  
Sea Water ◽  
Infrastructure Development ◽  
Self Compacting Concrete ◽  
Concrete Technology ◽  
Ongoing Research ◽  
Microstructure Characteristics ◽  
The Difference ◽  
Microstructure Characteristic ◽  
Mixing Water

Indonesia is an archipelagic country which makes many areas doesn’t have qualified water as drinking water. As concrete construction building in the region has possibly minimum or non-existent amount of fresh water, the using of sea water in mixing concrete and curing concrete is unavoidable. The demand of water is getting more and more increasing in both the improvement of infrastructure development and the life need. In the concrete industry, several billion tons of water is used as water mixing, curing and cleaning every year. Therefore the use of sea water is not allowed. In fact, we know that seawater is one of the abundant natural resources. Due to this problem, the research on the use of sea water is very important owing to the saving of freshwater is seriously needed. This study uses sea water by combining effective and efficient concrete technology of Self Compacting Concrete (SCC). This paper is a part of ongoing research studying about microstructure characteristics and the strength of SCC using sea water. It discusses about the compressive strength, absorption and porosity as microstructure characteristics of SCC until the age of 28 days. The results are: (1) the seawater used as mixing water did not affect the development of the compressive strength of concrete, (2) the difference compressive strength of SCC-SS with SCC-FF at an early age is very high occurred at ages 1 and 3 days and (3) The higher the compressive strength value is, the smaller the absorption and porosity is in concrete.

scholarly journals Rheodynamic Concrete as a Progressive Viability in the field of Concrete Technology

2020 ◽  
Vol 9 (3) ◽  
pp. 319-327
Keyword(s):  
Fly Ash ◽  
Rice Husk Ash ◽  
Construction Material ◽  
Working Environment ◽  
Construction Work ◽  
Self Compacting Concrete ◽  
Concrete Technology ◽  
The World ◽  
By Products ◽  
Safe Working

The most important material which is used for the construction of any concrete structure is concrete itself. It is considered to be as a versatile construction material as its properties can be changed by various means, with the help of different elements and as and when required. Rheodynamic Concrete or Self-Compacting Concrete is a special form of concrete which can easily flow into any kind of formwork uniformly, without facing the problem of bleeding and segregation, gives a better finish, has a great characteristic of placement, requires no vibration, and thus gives a safe working environment. Due to a number of merits, this type of concrete had becoming popular in the construction work. Simultaneously, the big industries across the world are producing the by products such as fly ash, rice husk ash, etc. Thus, this paper represents a review, which is done to incorporate these wastes by – products in Self-Compacting Concrete and observe, how the different properties of the same has been modified effectively and efficiently.

scholarly journals Research Status and Development Trend of Self-Compacting Concrete technology

2020 ◽  
Vol 198 ◽  
pp. 03001
Author(s):  
Wenxiang Ning ◽  
Qiang He ◽  
Jian Gong
Keyword(s):  
Performance Testing ◽  
Development Trend ◽  
Research Process ◽  
Self Compacting Concrete ◽  
Concrete Technology ◽  
Research Status ◽  
Mix Proportion ◽  
Working Performance ◽  
Definition Of ◽  
Preliminary Application

The definition of self-compacting concrete is briefly introduced. The research process of self-compacting concrete in various countries in the world is studied, from the initial test to the final formation of the preliminary application specification, and it is constantly improved. The mix proportion design, working performance, testing method, application and research status of self-compacting concrete are discussed in detail, and the problems to be solved in the future and the development prospect are prospected

scholarly journals Influence of polypropylene fiber on early strength of self-compacting concrete

2019 ◽  
Vol 258 ◽  
pp. 01020
Author(s):  
Rahmi Karolina ◽  
Abdiansyah Putra Siregar
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Flexural Strength ◽  
Polypropylene Fiber ◽  
Fiber Content ◽  
Polypropylene Fibers ◽  
Self Compacting Concrete ◽  
Concrete Technology ◽  
Early Strength

One of the development of concrete technology in construction’s world is Self-Compacting Concrete. Self-Compacting Concrete (SCC) is an innovative concrete that able to “flow” and condensed by gravity and its own weight with little vibration or even without a vibration device at all. However, these concrete still have deficiencies like general concrete that is weak to tensile. To increase the tensile strength of the concrete is by adding fiber into the mix. One type of fiber that can be used as an additive to the mix is Polypropylene fibers. This study aims to determine the effect of adding polypropylene fibers to the mechanical properties and characteristics of SCC concrete and to know the optimal polypropylene fiber content in the manufacture of Self Compacting Concrete. Fiber addition variations are 0 kg / m3; 0.25 kg / m3; 0.5 kg / m3 and 0.75 kg / m3. The result of the research showed that the variation of 0.5 kg / m3 and 0.75 kg / m3 addition of fibers didn’t fulfill the requirements to be categorized as a SCC concrete. The results of hard concrete test showed the highest compressive strength that is on the SCC PP concrete of 22.31 MPa at the age of 1 day and 46.24 at the age of 28 days. The highest strength is on the SCC 0.25 PP concrete of 6.52 MPa at the age of 1 day and 10.07 at the age of 28 days. The highest flexural strength is on the SCC 0.25 PP concrete of 6.76 at the age of 1 day and 8.60 at the age of 28 days.

scholarly journals Development of Variants of High-Performance Self-Compacting Concrete with Improved Resistance to the Attack of Sulfates

2021 ◽  
Vol 11 (13) ◽  
pp. 5945
Author(s):  
Ivailo Terzijski ◽  
Dalibor Kocáb ◽  
Petr Štěpánek ◽  
Jiří Strnad ◽  
František Girgle ◽  
...  
Keyword(s):  
High Performance ◽  
Graphical Method ◽  
New Technology ◽  
Practical Application ◽  
Negative Effects ◽  
Self Compacting Concrete ◽  
Concrete Technology ◽  
Sewer Pipes ◽  
Aqueous Environments ◽  
Analytical Work

This paper presents experimental and analytical work of which the main objective was to support the introduction of a new technology for the production of sewer pipes. In this technology, the pipes produced consist of two differently produced parts. The direct part uses conventional vibro press compacted concrete. In the curved part, on the other hand, self-compacting concrete technology is used. The cooperating company, Prefa Brno a.s., defined possible negative effects on concrete of sewer pipes. The task of the research team and now the author’s team was to propose a procedure for the development of suitable self-compacting concrete variants and subsequently the design of a methodology to verify their durability in aqueous environments containing sulfates. To increase the efficiency of the development, the model mortar method was used in the experimental work. That is, instead of the original concrete, a model mortar derived from it was tested. The principle and procedure of derivation of model mortars are described in the paper. In total, eight variants of model mortars were tested, and at least three of them fulfilled the requirements. An optional but beneficial part of the carried out work was the derivation and practical application of the time-anchored-triangles-of-cracking graphical method developed during the research. This method is used to quickly compare the degree of attack of different silicate composites tested in a common bath inducing type III corrosion.

Rheological Optimization of Self Compacting Concrete with Sodium Lignosulfate Based Accelerant Using Hybrid Neural Network-Genetic Algorithm

2016 ◽  
Vol 866 ◽  
pp. 9-13 ◽  
Author(s):  
Nolan C. Concha
Keyword(s):  
Neural Network ◽  
Genetic Algorithm ◽  
Rapid Change ◽  
Strong Stability ◽  
Self Compacting Concrete ◽  
Concrete Technology ◽  
Optimum Proportion ◽  
Material Homogeneity ◽  
Relationship Of ◽  
The Relationship

One of the most useful innovations in concrete technology is Self Compacting Concrete that has the ability to flow efficiently and maintain material homogeneity. The rapid change in the behavior of concrete due to accelerating admixtures can significantly affect the workability properties of the mixture and reduce its ability to flow efficiently. To describe the influence of superplasticizers blended with accelerant on the rheological properties of SCC, several mixtures were tested for Slump Flow, L-Box, and Screen Stability tests. Artificial neural network was used to obtain a model describing the constitutive relationships between the material components and workability parameters of SCC and was optimized using Genetic Algorithm. Results showed that ANN was able to establish the relationship of rheology to the concrete material components and GA derived the optimum proportion for best rheological performance. Most of the design samples of SCC with blended superplasticizer and sodium lignosulfate accelerant were not able to perform well in the flowing ability due to inefficiency of the fresh SCC to flow. The increasing dosage of accelerant however rendered strong stability between the concrete particles allowing the SCC samples to resist segregation and maintain material homogeneity.

scholarly journals Influence of Surface Treatment of Recycled Aggregates on Mechanical Properties and Bond Strength of Self-Compacting Concrete

2019 ◽  
Vol 11 (15) ◽  
pp. 4182 ◽  
Author(s):  
Waiching Tang ◽  
Mehrnoush Khavarian ◽  
Ali Yousefi ◽  
Ricky W. K. Chan ◽  
Hongzhi Cui
Keyword(s):  
Mechanical Properties ◽  
Surface Treatment ◽  
Recycled Concrete ◽  
Recycled Aggregates ◽  
Lithium Silicate ◽  
Concrete Aggregate ◽  
Self Compacting Concrete ◽  
Concrete Technology ◽  
Structural Application ◽  
Hardened Properties

In the last decade there has been a massive growth for development of concrete infrastructures all around the world. Take into account environmental concerns, concrete technology should direct efforts toward assuring development and fabrication of sustainable and resilient concrete. For this purpose, incorporation of recycled concrete aggregate in concrete products particularly self-compacting concrete (SCC) for structural and non-structural application would be significant achievement. In this study the fresh and hardened properties of SCC prepared by substituting natural aggregates (NA) with recycled coarse aggregates (RCA). In addition, bonding behaviour of reinforced RCA-SCC for structural application was investigated. Moreover, surface treatment of RCA using lithium silicate solution was proposed to investigate its feasibility to improve the fresh and hardened properties of SCC as well as its bonding strength. The mechanical properties including compressive strength, tensile strength and elastic modulus of SCC mixes using untreated RCA and treated RCA (TRCA) were investigated. The results showed an improvement in performance of SCC mixes made with TRCA in compare with the untreated samples. The bond behaviour between SCC made with RCA and steel reinforcement was studied and the relationship between the brittleness and bonding of SCC mixes using untreated RCA and TRCA determined. The effect of surface treatment on the interfacial transition zone (ITZ) between adhered mortar and RCA studied using scanning electron microscope (SEM). It was determined that the treatment of RCA improved the bond at the ITZ through densification. The results gave experimental evidence of the suitability of RCA-SCC for structural use and application in reinforced concrete.

scholarly journals Influence of Magnesium Sulfate on Self-Compacting Alum Sludge Concrete Incorporating with Pozzolanic Materials

2016 ◽  
Vol 10 (8) ◽  
pp. 187
Author(s):  
Khalid M. Breesem ◽  
Manal M. Abood ◽  
Nurharniza Abdul Rahman
Keyword(s):  
Magnesium Sulfate ◽  
Natural Zeolite ◽  
Visual Inspection ◽  
Sulfate Attack ◽  
Sulphate Attack ◽  
New Materials ◽  
Self Compacting Concrete ◽  
Concrete Technology ◽  
Maximum Value ◽  
Alum Sludge

Self-compacting concrete (SCC) is a new revolution in concrete technology that made with no vibration equipment in placing and compaction. Totally, filling formwork and accomplishing full compacting under its own weight only, even when is attendance of crowded reinforcement. One of the issues that impact SCC durability is sulphate attack. The influence of magnesium sulfate attack was investigated for SCC having treated alum sludge (TAS) with ordinary Portland cement (OPC) at replacement ratios of 5%, 10%, 15% and 20% as well as, six SCC containing TAS, fly ash (FA), silica fume (SF) and natural zeolite (NZ) replaced cement by15%, 15%, 6% and 10%, respectively. By visual inspection of all samples of SCC, there was no indication of deterioration on the surface of samples after 90 days and 180 days. In terms of compressive strength, there was developed with samples substituted OPC by 15% TAS compared with control SCC and the others SCC replacement levels. A similar conclusion was observed of the characteristics of SCC on weight compared with control SCC. Results proved that the SCC contain TAS have higher resistance against sulfate attack as well as the maximum value of mass loss and variation in weight are noted for the control SCC compared with SCC content TAS. Finally, in spite of the system of blended in SCC was investigated in several studies and so far, more investigations are required to fully explore its behavior, especially with new materials which is alum sludge that refer to the pioneering aspect of the present.

AIR-ENTRAINMENT PROBLEM IN SELF-COMPACTING CONCRETE

2009 ◽  
Vol 15 (2) ◽  
pp. 137-147 ◽  
Author(s):  
Janusz Szwabowski ◽  
Beata Łaźniewska-Piekarczyk
Keyword(s):  
Frost Resistance ◽  
Air Entrainment ◽  
Actual State ◽  
Self Compacting Concrete ◽  
Concrete Technology ◽  
Porosity Structure ◽  
Problematic Issue ◽  
Concrete Testing ◽  
Entrainment Effect ◽  
New Generation

According to the actual state of knowledge and in accordance with the PN‐EN 2006–1 norm, it is recommended to use air‐entrainment as a basic way of assuring frost‐resistance of concrete. In case of self‐compacting concrete (SCC), achieving adequate air‐entrainment is a problematic issue because of one of the side‐effects of the functioning of a new generation of superplasticizers, i.e. excessive air‐entrainment (considerably higher than 2%) in a self‐compacting concrete mix. Thus, in this situation, the dosage of an air‐entraining admixture has to be reduced. It was discovered that the cause of an air‐entrainment effect of superplasticizers is a decrease of the surface tension value of the liquid phase in paste. In the paper, the problem of air‐entrainment is discussed, formed as a result of the functioning of a superplasticizer on the characteristics both of concrete and a mixture, depending on the content. To verify the influence a superplasticizer and an air‐entraining admixture have on concrete porosity structure parameters, concrete samples were tested during 300 cycles of freezing and testing the porosity structure according to PN‐EN 480–11. The tests of the structure show that air pores, depending on the level of mix flowability, can be regular and similar in shape and size to pores formed as a result of air‐entrainment admixture action. According to the actual state of knowledge on concrete technology, concrete is frost‐resistant if the value of porosity structure parameter stays within precisely set limits. The results of concrete testing have shown that the parameters of porosity structure do not stay within the precisely set limits, but self‐compacting concrete gets frost‐resistance F300 according to PN‐88/B‐06250. Issues connected with this fact are the subject of this paper. Santrauka Laikoma, kad betono atsparumą šalčio poveikiui galima užtikrinti naudojant orą įsiurbiančius priedus. Savaime susitankinančio betono orą įsiurbiančių priedų taikymas ypač painus, nes šiuo atveju galima naudoti tik naujos kartos plastiklius, kurie pasižymi didesniu oro įsiurbimu – >2 %. Norint įvertinti superplastiklių ir orą įsiurbiančių priedų įtaką betono porėtosios struktūros parametrams, buvo ištirta betono bandinių po 300 šaldymo ciklų struktūra pagal PN-EN 480-11 normų reikalavimus. Tyrimų rezultatai parodė, kad nors porėtosios struktūros parametrai nevisiškai atitinka reikalavimus, savaime sutankėjantis betonas pagal PN-88/B-06250 reikalavimus yra F300 klasės. Būtent šis klausimas išsamiai nagrinėjamas straipsnyje.

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