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Jul 07, 2015· Recent interest in creating green construction materials has sparked the development of portland cement–free binders. Alkaliactivated slag (AAS) concrete has a low embodied energy and comparable or superior strengths to ordinary portland cement (OPC) concrete.
of alkaliactivated concrete has been estimated around 80 % compared to Portland cement concretes [1, 6 ]. Alkaliactivation of ground granulated blast furnace slag (GGBS) has become the subject of intense research interest within the past decade. Strength development of slag cement is highly sensitive to curing conditions [7].
Alkali Content of Concrete Mix Water and Aggregates Introduction Alkali silica reaction (ASR) is a chemical reaction between some types of aggregate and the highly alkaline pore water present in all Portland cement concretes. When the concrete contains sufficient moisture, alkalis and reactive aggregate the reaction produces
Blast furnace slag cement is the mixture of ordinary Portland cement and fine granulated blast furnace slag obtained as a by product in the manufacture of steel with percent under 70% to that of cement. Ground granulated blast furnace slag cement (GGBFS) is a fine glassy granules which contain cementatious properties.
Cement Cement Slag cements: The granulated slag made by the rapid chilling of suitable molten slags from blast furnaces forms the basis of another group of constructional cements. A mixture of portland cement and granulated slag, containing up to 65 percent slag, is known in the Englishspeaking countries as portland blastfurnace (slag) cement.
Indeed, geopolymer cement is sometimes mistaken for alkaliactivated cement and concrete, developed more than 50 years ago by Glukhovsky in Ukraine, the former Soviet Union. They were originally known under the names "soil silicate concretes" and "soil cements".
Jul 27, 2017· Prof. J. Davidovits explains the main differences between AAC (AlkaliActivated Cement or Concrete), AAS (AlkaliActivated Slag), AAF (AlkaliActivated Fly Ash) and Slagbased Geopolymer cement, in terms of chemistry, molecular structure, longterm durability. In a second part, on hand of the industrialization of Slag/fly ashbased geopolymer ...
Alkaliactivated ground granulated blastslag (AAS) is the most obvious alternative material for ordinary Portland cement (OPC). However, to use it as a structural material requires the assessment and verification of its durability. The most important factor for a durability evaluation is the degree of carbonation resistance, and AAS is known to show lower performance than OPC.
SCIC #23, Slag Cement and Life Cycle Prediction Models, examines how slag cement can positively affect some of the properties that increase the useful life of a concrete structure and decrease life cycle cost, including low permeability, increased corrosion resistance, high strength, improved resistance to alkalisilica reactivity and sulfate ...
Sep 09, 2017· Successive addition of sodium hydroxide deteriorates the mechanical strength of the slag cement. The reaction kinetics are also studied by examining the hydration products of slagblended cement paste through the technologies of Xray diffraction (XRD), scanning electron microscopy (SEM), and nuclear magnetic resonance spectroscopy (NMR).
The paper discusses approaches to compositional buildup of high strength alkali activated cements made using water glass as alkaline activator represented by commercial products in a form of powder and liquid. The purpose was to study the influence of fineness of ground granulated blastfurnace slags, admixtures and additives, compatible with alkali activated cements, water glass and mode of ...
Alkali activated slag (AAS) has gained huge attention in recent years due to its ability to replace ordinary Portland cement (OPC) as a binder in concrete. A need to replace OPC is imminent due to the high carbon dioxide emitted into the environment during its production. However, the use of this type of binder did not eliminate the huge strain placed on the deposit of natural resources.
In this standard practice, the minimum level of slag is determined by consideration of aggregate reactivity, alkali availability, the exposure conditions, and the size and type of the concrete structure. Slag cement contains a small amount of, the amount of alkali is similar to that of low tomoderatealkali portland cement ...
The blast furnace slag and cement concretes were designed to a total content of 357 kg/m 3. The OPC concrete was mixed with water and % (cement weight) chemical admixture, whereas the alkaliactivated slag concretes were mixed with one of two solutions :Panreac 98% pure, 10 M NaOH (5% Na 2 O by slag mass)
The provisions for personal protective equipment which are specified in the Materials Safety Data Sheets for many commerciallyavailable alkaliactivated binder systems and concretes are actually very similar to those specified for the handling of fresh Portland cement paste and concrete; the importance of correctly following the required ...
As a new construction material to mitigate the disadvantages of concrete, fiberreinforced alkaliactivated slag or geopolymer composite is environmentally friendly because it can be produced using industrial byproducts [5,6,7,8,9,10,11]. It also has high ductility, of over 3%, under a tensile load.
Thus, at 60 C the slag with 640 mý/kg of fineness and a watercement ratio of reached a compressive strength of approximately 40 MPa after a curing period of 4 hr. After a curing period of 72 hr, the heat of hydration of the slag cements was only about 60 percent of that of the modified portland cement.
The NewCem® Slag Cement Advantage. To produce quality slag, a producer needs to have slag with an ideal chemistry from a consistent source and needs to have equipment close to the slag source to provide rapid quenching of the slag. Lafarge engineers and scientists have led North America in the research and development of specifications for slag.
Terminology and Specifications SCIC #12 An excellent primer for those new to the slag cement industry, SCIC #12, Terminology and Specifications, offers definitions of 12 basic slag cementrelated terms, including slag cement, granulated blast furnace slag, blended cement, hydraulic cement .
Slag powder processing equipment and technological process. Phrase one: raw material crushing Slag blocks will be crushed to 15mm50mm fineness by crusher. Phrase two: grinding Crushed slag material will be sent to the storage hopper by the elevator, and then the .
They include Portland cement as covered by AASHTO M85 (2), Portland blast furnace slag cement (blended cement type IS), and slag cement (slag cement type S) as per AASHTO M240. (3) The use of GGBFS as a partial Portland cement replacement takes advantage of the energy invested in the slag making process and its corresponding benefits with ...
This paper presents a characterization analysis of alkaliactivated steel slag. The effect ratio of steel slag and ferronickel slag which are the precursor materials on the compressive strength of the alkaliactivated materials was investigated. The combination of sodium hydroxide solution of 15 moles concentration and sodium silicate was used as an alkaline activator.
This paper examines on the setting time and mechanical strength behaviour of slag cement pastes activated with different alkaline activators. For this purpose three alkaline solutions were used: waterglass solution (27% SiO2, 18 % Na2O and 55% H2O), NaOH and Na2CO3, maintaining always a constant concentration of Na2O (4% by mass of slag).
Concrete containing ground granulated slag develops strength over a longer period, leading to reduced permeability and better durability. Since the unit volume of Portland cement is reduced, this concrete is less vulnerable to alkalisilica and sulfate attack. [citation needed]
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