Self-compacting concrete produced with limestone waste (original) (raw)
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Effects of Limestone Powder on Self-compacting Concrete Properties
FES Journal of Engineering Sciences, 2021
Powder type of self-compacting concrete (SCC) needs high cement content to achieve self-compactibility, this will be undesirable in tropical climate of Sudan due to implication of high hydration heat. This paper investigates reducing cement content up to 340 Kg/m3 by blending limestone powder (LSP) up to 15 % as replacement of cement weight. Therefore, fifteen mixes having maximum powder content (P) of 400 Kg/m3 have been carried out with four water/powder ratios (W/P) (0.35, 0.4, 0.43 and 0.45). Fresh properties and compressive strength of SCC were measured. Results show most of the mixes have achieved self-compactibility in the fresh stages. However, the compressive strength of the mixes has been reduced with increased level of LSP replacing cement. This reduction in strength is caused by dilution effect of adds LSP.
Properties of Self Compacting Concrete Containing Limestone Powder as Replacement of Sand
In this paper the properties of Self Compacting Concrete (SCC) was investigated using white cement and lime stone powder as fine aggregate instead of sand. All mixtures were proportioned with constant amount of (cement, lime stone powder, coarse aggregate and silica fume). While the glass powder, ceramic powder and glue were used as additives in different proportions from cement weight. The study focuses on comparison of fresh properties for self compacting concrete using two types of testing flow test and J-ring test. Whereas the hard concrete properties tests limited to compressive strength. The results leading to some developing in fresh properties and hard properties of self compacting concrete due to adding the additives. The best spread ability obtained at adding glue (4%) from cement weight. While the glass powder and ceramic powder affect to hard properties, adding ceramic powder increased the compressive strength at rates between (10-20) % from cement weight and adding glass powder modified the compressive strength at rates more than (20)% from cement weight.
Properties of limestone self-compacting concrete at fresh and hardened state
European Journal of Environmental and Civil Engineering, 2014
Introduction Self-Compacting Concrete (SCC) use is spreading worldwide and it is becoming the regular solution in some special applications. The denser nature of the mortar phase of SCC with respect to Normal Vibrated Concrete (NVC), due to its own characteristics (fine particles, reduced maximum aggregate size, etc.), is well known (Domone, 2007; Zhu & Bartos, 2003). This peculiar property usually results in an increase in the durability of the structural elements in SCC, basically because the reduced porosity (relative both to the number of porous and to the maximus porous size) slackens the diffusion of external agents into the concrete. Usually, to reduce the porosity and to increase both the durability and the mechanical properties of concrete, ultra-fine particles are employed, as silica-fume (a by-product of iron-silicon production), whose principle effect is to fill the voids between the cement grains and the aggregates conferring a higher density to the concrete. In recent years, due to raising difficulties in silica-fume supplying and to some logistic issues concerning its use on big job-sites, the use of silica-fume seems not anymore suitable, favouring the use of limestone as a filler, especially in Europe area. Recently, the Italian market (especially in the Lombardia region) required special concretes to be used for the construction of high-rise buildings. For this reason, the presented investigation is aimed to the production and the characterisation of a series of SCC mixes which employ as fine particles not silica-fume additions, but rather
Use of different limestone and chalk powders in self-compacting concrete
Cement and Concrete research, 2005
This paper presents a study on the use of different types of limestone and chalk powders as fillers in self-compacting concrete (SCC) and their effects on superplasticizer demand and the strength properties of concrete mixes. It was found that all the different limestone and chalk ...
Elaboration and characterization of self-compacting concrete based on local by-products
International Journal of Engineering, Science and Technology, 2014
The building industry is increasingly using self-compacting concrete (SCC) in order to improve many aspects of buildings construction. If the limestone filler is traditionally used in the SCC, marble powder and granulated blast furnace slag are the less. The valorization of such wastes in self-compacting concrete as mineral admixture could be an interesting ecological and economical alternative, which allow extending the use of these by-products. The objective of this study is not only to remove the fear of using by-products available locally but also to study the influence of limestone powder replacement by marble powder and granulated blast furnace slag on fresh and hardened properties of SCC under two different curing modes. For this purpose, a comparative study was conducted on a reference SCC with limestone’s filler (SCC LP) which was replaced by marble powder (SCC MP) as a calcic material and granulated blast furnace slag (SCC GBFS) as a pozzolanic material. At fresh state, th...
Self Compacting Concrete: Use of Waste Marble Powder as Filler Material
Pakistan Journal of Engineering and Applied Sciences, 2016
Self compacting concrete (SCC) is a type of concrete which can flow and spread through reinforcement and narrow sections which fills the empty spaces completely without any mechanical vibration. This type of concrete requires large quantity of powder, for which either fine pozzolanic (e.g. fly ash, ground granulated blast furnace slag and silica fume etc) or non-pozzolanic additions (crushed limestone or sand stone etc) are used. The composition of this blend of cement and filler material is significant in SCC, as high amount of cement with lower water content may cause autogenous shrinkage. Therefore, the use of non-pozzolans material with cement needs to be investigated. The concrete industry is among the largest consumer of raw materials. Limestone fillers are generally used in concrete. As marble stone is of limestone origin i.e. marble is formed by metamorphism of limestone. The effect of addition of non-pozzolans powder waste from marble industry is studied for its suitability...
Full Characterization of Self-Compacting Concrete Containing Recycled Aggregates and Limestone
Materials
This work deals with the study of self-compacting concretes (SCCs) containing recycled aggregates (RAs) recovered from demolition waste and limestone filler as a partial replacement for natural aggregates (NAs) and cement, respectively. Four mix designs were developed and characterized in both the fresh and hardened states. In the fresh state, the properties studied included slump, sieve stability, and t500 viscosity. In the hardened state, the properties studied were compressive strength and porosity at 15 h and 28 days, thermogravimetric analysis, and durability tests involving freeze–thaw cycles and accelerated carbonation. The results indicate the RAs lead to a decrease in slump flow. However, the substitution rate of aggregate replacement does not affect the compressive strength. This can be attributed to the optimized mix design, resulting in all SCC mixtures achieving the same compressive strength class of 30–35 MPa. As for the durability tests, the incorporation of recycled ...
Self compacting concrete (SCC), which flows under its own weight and does not require any external vibration for compaction has revolutionized concrete placement. It is highly workable concrete that can flow under its own weight through restricted sections without segregation and bleeding. Several admixtures have been developed to improve the strength and workability properties of concrete. Of all admixtures used in concrete, Metakaolin occupies a special position for quite a few reasons. The improvement of durability, resistance to chloride, sulphate, freezing and thawing, alkali silica reaction, frost attack, increase in compressive strength, reduces the permeability and bleeding. Quarry dust, a by-product from the crushing process during quarrying activities is one of such materials. Granite fines or rock dust is a by-product obtained during crushing of granite rocks and is also called quarry dust. In recent days there were also been many attempts to use Fly Ash, an industrial by product as partial replacement for cement to have higher workability, long term strength and to make the concrete more economically available. The present experiment is carried out to investigate the fresh and hardened properties of ternary blended self compacting concrete with 10% of Metakaolin and 30% of fly ash by weight of cement as partial replacement of cement and addition of 0%, 20%, 40% and 60%of Quarry dust as fine replacement.
EFFECT OF STONE DUST AND FINES ON THE PROPERTIES OF HIGH STRENGTH SELF COMPACTING CONCRETE
Self-compacting concrete (SCC) represents a milestone in concrete research. SCC is a highly flow-able, non-segregating concrete that can spread in to place, fill the formwork and encapsulate the reinforcement without any mechanical vibration for consolidation. SCC was originally developed at the University of Tokyo, Japan during the year 1986 by Prof. Okamura and his team to improve the quality of construction and also to overcome the problems of defective workmanship. Concrete technology has made significant advances in recent years which results in economical improvement of the strength of concrete. This economical development depends upon the intelligent use of the locally available materials. Important constituent of self-compacting concrete (SCC) is natural sand and filler material which is expensive and scarce. This necessitates that a suitable substitute be found. The cheapest substitute for natural sand is quarry dust and for filler material is fly ash. Quarry dust, a by-product from the crushing process during quarrying activities is one of the materials being studied and fly ash is an artificial pozzolanic material, a finely divided pozzolana form compounds which have cementitious properties, when mixed with hydrated lime and alkalis. In this work, the fresh and compressive strength properties of self compacting concrete when the sand is partially replaced with stone dust , when the filler materials is increased by adding fly ash in % of the total powder content and when both substituent's are implemented simultaneously. Optimization of stone dust and fly ash is also obtained. The results indicated that the incorporation of quarry dust into the self compacting Concrete mix as partial replacement material to natural sand resulted in higher compressive strength and optimization of sand replacement is 40%. Optimization of addition of fly ash in total powder content is 30%.