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2021
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High strength concrete (HSC) is highly promising building material widely used in large scale concrete constructions that require high strength, high flow ability and high durability. Several studies have been carried out in past decades to identify the use of supplementary cementitious material in concrete. To increase the durability along with strength of concrete leads to the use of high-strength concrete which is more beneficial for environmental attacks on the structure. Various studies are performed on HSC with respect to workability, strength and durability. The addition of different mineral and chemical admixtures increases the strength and durability of HSC. The effect of SCM on strength durability of High Strength Concrete(HPC)using GGBS with Alccofine & GGBS with silica fume is studied.
International journal of scientific research, 2021
High strength concrete (HSC) is highly promising building material widely used in large scale concrete constructions that require high strength, high flow ability and high durability. Several studies have been carried out in past decades to identify the use of supplementary cementitious material in concrete. To increase the durability along with strength of concrete leads to the use of high-strength concrete which is more beneficial for environmental attacks on the structure. Various studies are performed on HSC with respect to workability, strength and durability. The addition of different mineral and chemical admixtures increases the strength and durability of HSC. The effect of SCM on strength durability of High Strength Concrete(HPC)using GGBS with Alccofine & GGBS with silica fume is studied.
To study the role of silica fume and ground granulated blast furnace slag (GGBS) on concrete strength characteristics of a high-strength test program has been accomplished. Different concrete mixtures were cast and tested with different levels of cement replacement (0 %, 10 %, 20 %, 30% and 40 %) of GGBS with active silica fume as addition (0 %, 5 %, 10 % and 15 % by weight of cement). High performance concrete (HPC) is a concrete meeting special combinations of performance and uniformity requirements. This leads to examine the admixtures to improve the performance of the concrete. The usage of mineral admixtures in the concrete not only enhances its strength properties but also durability. The main objective of this study is to determine the optimal replacement percentages that can be appropriately used in Indian conditions. To find the optimal replacement GGBS with the addition of silica fume in M60 grade concrete with maintaining water cement ratio of 0.32 .
The influence of supplementary cementitious materials (SCMs), namely silica fume, metakaolin, fly ash and ground granulated blast-furnace slag, on the engineering properties of high strength concrete (HSC) has been investigated in this study. Workability, compressive strength, elastic modulus, porosity and pore size distribution were assessed in order to quantify the effects of the different materials. The results show that the inclusion of the different SCMs has considerable influence on the workability of HSC. Silica fume and metakaolin significantly enhanced the strength of HSC. Fly ash reduced the early-age strength; however, it enhanced the long-term strength of the HSC. Likewise, ground granulated blast-furnace slag impaired the early-age strength, but marginally improved the long-term strength at low replacement levels. The general effect of the different SCMs on the elastic modulus of HSC is rather small compared to their effect on strength. There are good correlations between both static and dynamic moduli and compressive strength. The EC 2 and ACI 209 provide a good estimate of static modulus of elasticity from compressive strength, while the BS8110 gives a good estimate of static modulus of elasticity from dynamic modulus of HSC containing the different SCMs. Porosity and pore size were reduced with the addition of the different SCMs. The volume of mesopores in the ranges of <15 nm and 15-30 nm was notably increased for HSC containing SCMs, whereas the percentage of macropores was significantly reduced.
IRJET, 2023
The aim of this investigation is to assess how mineral admixtures can enhance the compressive and flexural properties of concrete by partially substituting cement. The research will involve conducting trial and error experiments to explore the impact of Silica fume and GGBS when partially replacing cement while maintaining a constant water-cement ratio to produce highstrength concrete. To achieve this, concrete samples of varying percentages of Silica Fume (5%, 8%, and 10%) and GGBS (25-50%) will be casted and evaluated, with partial substitution of cement, in sizes of 150mmx150mmx150mm (cube) and 500 X 100 X 100 mm (beam). The goal of the study is to identify the optimal percentage of Silica fume and GGBS that will provide the highest compressive strength (M65, M70, M75) and flexural strength. The research involves an analysis of how mineral admixtures such as Silica fume and GGBS can be effectively used in cement and concrete construction materials.
There is great need to conserve all the natural resources. The various steps to be adopted in the direction that includes minimization of production of energy consuming materials and heavy utilization of industrial by-products. High strength concrete can be produce using such materials like fly ash, slag and silica fumes. In many countries, these materials are already used in manufacturing of concrete. Some of these material can be used as replacement for cement. Ultimately it results in the reduction of the cost manufacturing of concrete and reduces environmental pollution. To study the effect of mineral admixtures such as fly ash, slag and silica fume on mechanical properties of high strength concrete under the uniaxial compression and split tensile, experimental studies have been conducted. The cement was replaced by 5%, 10%, 15% and 20% with fly ash and slag respectively. The compressive strength and split tensile test were conducted on concrete specimen with different percentages of fly ash and slag at age of 7 days, 28 days and 56 days. This study shows that materials used in this experiment are suitable for HSC.
The construction industry has recently focused on the use of sustainable and innovative building materials, which called for the production of many supplementary cementitious materials with concrete to make the concrete produced durable and sustainable. Since high-strength concrete has many advantages other than its high strength, it has recently been used in non-traditional applications after for a long time confined to well-known traditional applications. This study presents the effect of micro ferrosilicon (FS) and mineral materials on high-strength concrete properties, where silica fume (SF), FS, and metakaolin (Mk) were used as additives to cement. Besides the consistency test, all-ages compressive strength, splitting tensile strength, modulus of elasticity and water permeability were investigated on the produced HSC. Microstructure analyses are carried out by SEM and EDX tests. The results showed a continuous decrease in a slump with the increase in mineral material, however, 15% FS and 15% MK were determined as the optimum percentage of the desired mechanical property. HSC performs up to 88 MPa compressive strength, 7.49 MPa tensile strength, and 39.89 GPa modulus of elasticity, as well as good durability properties. Finally, the high-strength concrete under consideration is suitable for use in both conventional and non-conventional applications and supports sustainable development and infrastructure development.
IRJET, 2022
India uses more than 100 million cubic meters of concrete per year, making it the most common building material there. Numerous varieties come in a variety of uses. High performance special concrete is one such variety that has greater durability and strength than regular special concrete with lower water cement ratio. The primary benefits relate to placement and consolidation without compromising strength. By using this, slender sections can be made with longer life in severe environments thus reducing the total quantity of material. The purpose of this paper is to describe the various supplementary cementitious materials used for HPC along with their impacts and other ingredients and their properties.
Mehran University Research Journal of Engineering and Technology
High strength concrete (HSC) is highly promising building material widely used in large scale concrete constructions that require high strength, high flow ability and high durability. Several studies have been carried out in past decades to identify the use of supplementary cementitious material in concrete. To increase the durability along with strength of concrete leads to the use of high-strength concrete which is more beneficial for environmental attacks on the structure. Various studies are performed on HSC with respect to workability, strength and durability. The addition of different mineral and chemical admixtures increases the strength and durability of HSC. The effect of SCM on strength and durability of High Strength Concrete (HPC) using ground granulated blast-furnace slag (GGBS) with Alccofine and GGBS with silica fume is studied.
— Concrete made from ordinary Portland cement continues to be used as one of the primary material because of its durability and strength characteristics in service life. But the contrary becomes the case when such concrete is exposed to aggressive environment created by the prevalence of chloride ions that are common in marine/coastal environment characterized by temperature extremes, that is peculiar to India. Same time, present global environmental requirements suggest the civil engineers for reducing the consumption of OPC. Use of mineral admixtures like Blast Furnace Slag, Fly Ash and Silica Fume etc. in concrete may be a suitable solution in such situation. Hot marine and coastal environment with large variations in temperature, constitute an aggressive environment that has been found to be deleterious to the strength and durability characteristics of concrete, thus causing premature deterioration of concrete structures. Research works to reverse this trend go on continuously. This paper presents one of such works which investigates the effect of partial replacement of cement with slag and replacement of normal river sand with crusher dust for concrete preparation. The specimens cured at elevated temperatures were studied for all the durability criteria at the optimized crusher sand percentage. It discusses the resistance of GGBFS blended concrete to Chloride attack, Sulfate attack, Carbonation, Aggregate-Silica reaction and Frost attack with factors influencing its performance. It was found out that partial replacement of cement with slag increases the resistance of concrete to chloride penetration. The durability of HPC specimens was evaluated on the basis of reduction in compressive strength when exposed in Sulfuric acid (pH=5) solution for 28 days. Specimens containing lesser alkali were found to have lower water absorption as compared to normal concrete.
Production of ultra-high performance concrete (UHPC) requires a high volume of micro silica (MS), called silica fume, that accounts for around 20% to 40% by weight of cement. Using large quantity of MS can impede the use of UHPC in the market due to its high cost and limited resources. This paper evaluates the possibility of producing sustainable UHPC utilizing Supplementary cementitious materials (SCMs) such as Metakaolin (MK), Fly Ash (FA) and Natural Pozzolan (NP) as a partial replacement of MS. The mechanical characteristics such as compressive strength, flexural strength, and fracture toughness and durability performance such as chloride penetrability, water permeability, drying shrinkage, water absorption, electrical resistivity and sulfate resistance were investigated. The results exhibited that a partial replacement of MS with 60% NP, 60% FA and 40% of MK contributed the paramount UHPC mixtures, with satisfactory strength and flowability requirements. The outcomes indicate that the increase in ultra-fine dosages decreases the flowability and increases the strength, as the finer particles perform as a filler between the cement and coarser grains. The UHPC specimens containing FA provided the worthiest results in comparison to other specimens. This study outcome also indicated that the SCMs can be used to develop UHPC with significant improvements in the mechanical and durability performance in comparison with conventional UHPC.
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