scholarly journals Mechanical Characteristics of Hardened Concrete with Different Mineral Admixtures: A Review

2014 ◽  
Vol 2014 ◽  
pp. 1-15 ◽  
Author(s):  
Tehmina Ayub ◽  
Sadaqat Ullah Khan ◽  
Fareed Ahmed Memon
Keyword(s):  
Mechanical Properties ◽  
Mechanical Characteristics ◽  
Drying Shrinkage ◽  
Mineral Admixture ◽  
Mineral Admixtures ◽  
Partial Replacement ◽  
Hardened Concrete ◽  
Granulated Blast Furnace Slag ◽  
Shrinkage And Creep ◽  
Furnace Slag

The available literature identifies that the addition of mineral admixture as partial replacement of cement improves the microstructure of the concrete (i.e., porosity and pore size distribution) as well as increasing the mechanical characteristics such as drying shrinkage and creep, compressive strength, tensile strength, flexural strength, and modulus of elasticity; however, no single document is available in which review and comparison of the influence of the addition of these mineral admixtures on the mechanical characteristics of the hardened pozzolanic concretes are presented. In this paper, based on the reported results in the literature, mechanical characteristics of hardened concrete partially containing mineral admixtures including fly ash (FA), silica fume (SF), ground granulated blast furnace slag (GGBS), metakaolin (MK), and rice husk ash (RHA) are discussed and it is concluded that the content and particle size of mineral admixture are the parameters which significantly influence the mechanical properties of concrete. All mineral admixtures enhance the mechanical properties of concrete except FA and GGBS which do not show a significant effect on the strength of concrete at 28 days; however, gain in strength at later ages is considerable. Moreover, the comparison of the mechanical characteristics of different pozzolanic concretes suggests that RHA and SF are competitive.

scholarly journals Effects of Different Mineral Admixtures on the Properties of Fresh Concrete

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Sadaqat Ullah Khan ◽  
Muhammad Fadhil Nuruddin ◽  
Tehmina Ayub ◽  
Nasir Shafiq
Keyword(s):  
Rice Husk Ash ◽  
Fresh Concrete ◽  
Setting Time ◽  
High Strength ◽  
Heat Of Hydration ◽  
Mineral Admixture ◽  
Mineral Admixtures ◽  
Small Particle Size ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag

This paper presents a review of the properties of fresh concrete including workability, heat of hydration, setting time, bleeding, and reactivity by using mineral admixtures fly ash (FA), silica fume (SF), ground granulated blast furnace slag (GGBS), metakaolin (MK), and rice husk ash (RHA). Comparison of normal and high-strength concrete in which cement has been partially supplemented by mineral admixture has been considered. It has been concluded that mineral admixtures may be categorized into two groups: chemically active mineral admixtures and microfiller mineral admixtures. Chemically active mineral admixtures decrease workability and setting time of concrete but increase the heat of hydration and reactivity. On the other hand, microfiller mineral admixtures increase workability and setting time of concrete but decrease the heat of hydration and reactivity. In general, small particle size and higher specific surface area of mineral admixture are favourable to produce highly dense and impermeable concrete; however, they cause low workability and demand more water which may be offset by adding effective superplasticizer.

scholarly journals Fresh, Strength and Durability Characteristics of Binary and Ternary Blended Self Compacting Concrete

2019 ◽  
Vol 9 (2) ◽  
pp. 3987-3991
Keyword(s):  
Heat Of Hydration ◽  
Mineral Admixture ◽  
Mineral Admixtures ◽  
Strength Gain ◽  
Self Compacting Concrete ◽  
Supplementary Cementitious Material ◽  
Durability Properties ◽  
Granulated Blast Furnace Slag ◽  
Strength And Durability ◽  
Furnace Slag

Paper Mineral admixtures being the economical alternatives to Ordinary Portland Cement (OPC) for various normal and special concretes induce desirable properties to concrete such as higher flow, low heat of hydration, higher strength gain and enhanced durability. Ground granulated blast furnace slag(GGBFS) being one of the largely used mineral admixture alongside Fly Ash as supplementary cementitious material in concrete contributes to enhanced durability properties and low heat of hydration. Various replacement percentages of GGBS at 30%, 40%, 50% and 60% are used in binary blended Self compacting concrete(SCC) in the present study. At 40% replacement level, SCC exhibited improved workability, strength and durability properties. Alccofine(Ultrafine GGBS) used in ternary blended SCC enhanced early strength gain without affecting workability of SCC to a significant extent.

scholarly journals Influence of Curing Time on the Drying Shrinkage of Concretes with Different Binders and Water-to-Binder Ratios

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Jun Yang ◽  
Qiang Wang ◽  
Yuqi Zhou
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Blast Furnace Slag ◽  
Drying Shrinkage ◽  
Mineral Admixture ◽  
Curing Time ◽  
Cement Concrete ◽  
Fly Ash Concrete ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag

Plain cement concrete, ground granulated blast furnace slag (GGBS) concrete, and fly ash concrete were designed. Three wet curing periods were employed, which were 2, 5, and 8 days. The drying shrinkage values of the concretes were measured within 1 year after wet curing. The results show that the increasing rate of the drying shrinkage of concrete containing a mineral admixture at late age is higher than that of plain cement concrete regardless of the wet curing time. With the reduction of wet curing time, the increment of total drying shrinkage of concrete decreases with the decrease of the W/B ratio. The negative effects on the drying shrinkage of fly ash concrete due to the reduction of the wet curing time are much more obvious than those of GGBS concrete and plain cement concrete. Superfine ground granulated blast furnace slag (SGGBS) can reduce the drying shrinkage of GGBS concrete and fly ash concrete when the wet curing time is insufficient.

Influence of Mineral Admixtures on the Carbonation Resistance and Chloride Permeability of Steam-Cured HPC

2011 ◽  
Vol 477 ◽  
pp. 366-374
Author(s):  
Jian Hua Wu ◽  
Yun Lan Liu
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Blast Furnace Slag ◽  
Mineral Admixture ◽  
Mineral Admixtures ◽  
Chloride Permeability ◽  
Concrete Carbonation ◽  
Granulated Blast Furnace Slag ◽  
Carbonation Resistance ◽  
Furnace Slag

This paper studies the influence of different mineral admixtures（fly ash and ground granulated blast furnace slag）on the carbonation resistance and chloride permeability of steam-cured HPC. The test results show that under the condition of steam-cured and standard-cured, incorporating 20-30% of the ground granulated blast furnace slag or 15-20% of fly ash decreased the alkalinity and the carbonation resistance of the concrete; with the increase of the proportion of the mineral admixture in concrete, carbonation resistance of HPC was decreased; incorporating 20-30% of the ground granulated blast furnace slag or 15-20% of fly ash improved the chloride permeability of steam-cured concrete, and the influence of ground granulated blast furnace slag is better than that of the fly ash.

scholarly journals Ecological and technological effects of using concretes with low Portland clinker

2020 ◽  
Vol 322 ◽  
pp. 01021
Author(s):  
Mikołaj Ostrowski ◽  
Paweł Pichniarczyk ◽  
Grzegorz Kądzielawski
Keyword(s):  
Mechanical Properties ◽  
Ecological Effects ◽  
Hardened Concrete ◽  
Test Results ◽  
Concrete Technology ◽  
Granulated Blast Furnace Slag ◽  
Concrete Mix ◽  
New Generation ◽  
Mineral Additives ◽  
Furnace Slag

Concrete with a low Portland clinker content involves the use of mineral additives as a cement component or as a additive in a concrete mix. The main factors influencing the increasing use of mineral additives in concrete technology are the advantageous development of the functional properties of the concrete mix, hardened concrete and a large impact on the ecological effects, including reduction of CO2 emissions. The use of concrete with a low Portland clinker content is part of the strategy for sustainable development of the economy. This paper describes the technological and ecological effects of using silica fly ash and granulated blast furnace slag additives in concretes with a low Portland clinker content. The cement and concrete additives used were mechanically activated, which allowed to reduce the content of Portland clinker in concrete. A new generation superplasticizer was used in the research, enabling a low water-cement ratio to be obtained. The mechanical properties and ecological effects of the production and use of concretes with a low content of Portland clinker were determined, including the reduction of CO2 emissions. Test results confirmed the very good mechanical properties of concrete with a high content of mechanically activated mineral additives. The research also showed an average of 3 times lower CO2 emissions compared to reference concretes made of CEM I Portland cement without additives.

Evaluation of Mechanical Properties of BAGcrete

2014 ◽  
Vol 984-985 ◽  
pp. 693-697
Author(s):  
K. Rekha ◽  
R. Thenmozhi
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Mineral Admixture ◽  
Partial Replacement ◽  
Hardened Concrete ◽  
Test Results ◽  
Replacement Ratio ◽  
Blended Cements ◽  
Sugarcane Bagasse Ash ◽  
Partial Cement Replacement

The usage of waste materials in making concrete gives a satisfactory solution to some of the problems related to waste management and environmental concerns. In the development of blended cements, some of the Agro wastes such as sugarcane bagasse ash, rice husk ash and wheat straw ash are used as pozzolanic materials. Few studies have been reported on the use of bagasse ash (BA) as partial cement replacement material. This research aims to study the physical and mechanical properties of hardened concrete prepared with bagasse ash as partial replacement material for cement are reported. The Portland cement was replaced with BA in the ratio of 0%, 5%, 10%, 15% and 20% of weight of cement. The compressive strength, splitting tensile strength and flexural strength of concrete at the age of 28 days were investigated. From the test results it was observed that bagasse ash is an effective mineral admixture, with 5% as optimal replacement ratio of cement.

Mechanical properties and freezing and thawing durability of concrete incorporating a ground granulated blast-furnace slag

1989 ◽  
Vol 16 (2) ◽  
pp. 140-156 ◽  
Author(s):  
V. M. Malhotra
Keyword(s):  
Mechanical Properties ◽  
Blast Furnace ◽  
Portland Cement ◽  
Blast Furnace Slag ◽  
Concrete Strength ◽  
Partial Replacement ◽  
Freezing And Thawing ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag ◽  
Durability Of Concrete

This paper gives the results of laboratory invstigations to determine the mechanical properties and freezing and thawing durability of concrete incorporating a granulated blast-furnace slag from a Canadian source. A series of fifteen 0.06 m3 concrete mixtures were made with water-to-(cement + slag) ratios (W/(C + S)) ranging from 0.70 to 0.45. The percentage of slag used as a partial replacement for normal portland cement ranged from 0 to 100% by weight. All mixtures were air entrained. A number of test cylinders and prisms were cast for determining the mechanical properties and freezing and thawing resistance of concrete.The test results indicate that the ground granulated blast-furnace slag can be used with advantage as a partial replacement for portland cement in concrete at 50% or lower replacement levels, especially at W/(C + S) of the order of 0.55 or lower. At 28 days, irrespective of the W/(C + S) and regardless of the percentage replacement of the cement by the slag investigated, the compressive strength of the concrete incorporating slag is comparable with that of the concrete made with normal portland cement. At all W/(C + S) and at all percentages of replacement, the flexural strength of the slag concrete is comparable with or greater than the corresponding strength of the control concrete. Durability of air-entrained slag concrete exposed to repeated cycles of freezing and thawing is satisfactory as evidenced by the high durability factors achieved. Key words: granulated slag, bleeding, time of setting, concrete, strength, freezing and thawing, shrinkage, creep, abrasion.

scholarly journals The Mechanical Properties on Partially Replacement of Cement by Ground Granulated Blast Furnace Slag and Fly-Ash in M40 Grade Concrete

2020 ◽  
Vol 8 (6) ◽  
pp. 1385-1388
Keyword(s):  
Mechanical Properties ◽  
Blast Furnace ◽  
Fly Ash ◽  
Blast Furnace Slag ◽  
Partial Replacement ◽  
Granulated Blast Furnace Slag ◽  
Present Generation ◽  
Construction Activity ◽  
Curing Condition ◽  
Furnace Slag

In the present generation the construction activity is rapidly increasing as a result the usage of cement is growing more and leads to environmental hazards. This study deals with the mechanical properties of partial replacement of cement by GGBS and Fly-Ash in M40 grade concrete. Cement were replaced as partially in the form of 5%,10%,15% and 20%. As per IS 456:2000 [1] the tests were conducted on 3,7 and 28th days after curing condition. This study proves that the possible replacement to cement by GGBS is 10% and fly ash 15% used in the concrete, which helps in minimizing the consumption of cement and environmental problems also

scholarly journals Assessment of Carbonation on Strength Properties of Concrete Made of Mineral Admixtures

2019 ◽  
Vol 8 (12) ◽  
pp. 1832-1835
Keyword(s):  
Blast Furnace ◽  
Reinforced Concrete ◽  
Silica Fume ◽  
Blast Furnace Slag ◽  
Strength Properties ◽  
Mineral Admixtures ◽  
Partial Replacement ◽  
Granulated Blast Furnace Slag ◽  
Almost All ◽  
Furnace Slag

Concrete is one of the most suitable materials in the world which are used for construction. It becomes more versatile because of his suitability in almost all situations. Reinforced structures are subject to corrosion by various means. Carbonation is one of these means that causes corrosion of reinforced concrete structures. The service life of the structures has been reduced due to the deterioration of the structures because of the corrosion of the reinforced concrete due to carbonation. This paper focuses on the effect of carbonation on the mechanical properties of concrete composed of mineral admixtures, such as ground granulated blast furnace slag and silica fume, by partial replacement of the cement. In this experiment, silica fume replaced cement in 5%, 10%, 15% and ground granulated blast furnace slag replaced the cement in 10%, 20%, 30%. Samples such as cubes, cylinders and prisms were casted and cured. Certain number of these specimens were also placed in carbonation chamber and tested for compressive strength, tensile strength and flexural strength. Normal concrete samples are also tested and the results are compared.

scholarly journals Mechanical Properties of Concrete with Mineral Admixtures - An Experimental Programme

2019 ◽  
Vol 8 (11) ◽  
pp. 3934-3936
Keyword(s):  
Composite Material ◽  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Mineral Admixtures ◽  
Partial Replacement ◽  
Natural Sand ◽  
Cement Production ◽  
Manufactured Sand ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag

Concrete is a general composite material used in construction industry over many decades. Due to rapid Growth of infrastructure, the demand of concrete is raising day by day. This composite material mainly made up of cementitious material such as cement and natural sand. This cement production results in release of large amount of CO2 which directly effects environment pollution and Global warming and also, the usage of natural sand leads to environmental degradation. So, better way to reduction in CO2 emission by minimizing cement content with some other puzolonic materials such as Metaakolin,Fly ash, Ground granulated blast furnace slag(GGBS) and This present Experiment is for to observe the cube and cylinder specimens strength of M40 grade of concrete at 7 days and 28 days with partial replacement of cement with ground granulated blast furnace slag ,Metakaolin and flyash @ 15%,30%,45% of binding material and natural sand with manufactured sand (M-sand)

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