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CBD-203. Superplasticizers in Concrete - NRC-IRC

Beyond a particular amount the superplasticizer may produce undesirable side effects. High-Strength Concrete. A concrete of high strength can be made without admixtures provided it is mixed with low amounts of water and has desirable workability characteristics. At low water. cement ratios however, it is not easy to achieve good workability.

IS 2645 (2003): Integral Waterproofing Compounds for ...

that the adverse effects of chlorides in concrete and its control through limiting the chlorides from the concrete materials and admixtures were most significant. The Committee, therefore, issued an .Amendment to this ... Portland slag cement conforming to IS 455 or I'ortland poz,wlaoa cement- Fly ash based conforming to IS 14W (Part 1) or ...

Portland Slag Cement: All You Like to Know!

Sep 11, 2018· Portland slag cement (PSC) is also known as blast furnace cement and more commonly known as PSC cement. It is manufactured by grinding Portland cement clinker, gypsum and round granulated blast furnace slag. It is generally constituted of 40-45% Portland cement, 40-45% slag and 3-5% gypsum. Slag is a by-product of the manufacture process of …

Effects of steel slag powder on workability and durability ...

Aug 05, 2014· The workability and durability of a type of sustainable concrete made with steel slag powder were investigated. The hydrated products of cement paste with ground granulated blast furnace slag (GGBFS) alone or with a combined admixture of GGBFS-steel slag powder were investigated by X-ray diffraction (XRD). Furthermore, the mechanism of chemically …

(PDF) Effects of Steel Slag Substitution in Geopolymer ...

Effects of Steel Slag Substitution in Geopolymer Concrete on Compressive Strength and Corrosion Rate of Steel Reinforcement in Seawater and an Acid Rain Enviroment April 2015 DOI: 10.14716/ijtech ...

Effects of Using Pozzolan and Portland Cement in the ...

Jun 24, 2013· Use of dispersive clay as construction material requires treatment such as by chemical addition. Treatments to dispersive clay using pozzolan and Portland cement, singly and simultaneously, were carried out in this study. When used alone, the optimum amount of pozzolan required to treat a fully dispersive clay sample was 5%, but the curing time to reduce …

(PDF) Feasibility study of high volume slag as cement ...

This paper presents a study on the use of high volume slag as a cement replacement material, and waste oil palm shell (OPS) as a lightweight aggregate to produce a sustainable lightweight concrete (LWC). In order to establish the feasibility of such

Ground granulated blast-furnace slag - Wikipedia

Ground-granulated blast-furnace slag (GGBS or GGBFS) is obtained by quenching molten iron slag (a by-product of iron and steel-making) from a blast furnace in water or steam, to produce a glassy, granular product that is then dried and ground into a fine powder.Ground-granulated blast furnace slag is highly cementitious and high in calcium silicate hydrates (CSH) which is a …

Effects of Aggregate Properties on Concrete - Size, Grading

May 02, 2017· Variation in the size of Aggregates changes the water demand, cement content, micro-cracking (strength) in concrete. It also effects pumpability, and durability of concrete. Grading of aggregates depends on the proportions of coarse and fine aggregate. If grading of aggregate is varied, it also changes cement paste content (cost economy), workability of the mix,

Safety Data Sheet Slag Cement - Lehigh Hanson, Inc.

exposures to wet slag cement, slag cement mixtures or liquids from wet slag cement. Burns should be treated as caustic burns. Slag cement causes skin burns with little warning. Discomfort or pain cannot be relied upon to alert a person to a serious injury. You may not feel pain or the severity of the burn until hours after the exposure.

Slag in the mix design - Concrete Engineering general ...

Aug 16, 2007· Slag cement is a wonderful material to work with, from 4,000 psi concrete to 15,000 psi concrete. I've used 50% in 13,000 psi concrete and it works beautifully. Don't be afraid to use 30% or 40%, you won't be sorry. Unfortunity, slag is not available in all areas, especially hard to find in the West.

Effects of curing conditions on properties of concrete ...

Four different concrete mix designs with the same mix proportions and different cement replacements were used: 0% slag (control), 25% slag, 50% slag, and 75% slag. The effects of slag replacement and curing conditions upon concrete properties were examined.

Some Engineering Properties of Slag Concrete as Influenced ...

May 01, 1990· The results emphasized that even 7-day wet curing was inadequate for high levels of slag replacement, and that continued exposure to a drying environment can have adverse effects on the long-term durability of inadequately cured slag concrete.

Environmental impact of concrete - Wikipedia

The environmental impact of concrete, its manufacture and applications, are complex.Some effects are harmful; others welcome. Many depend on circumstances. A major component of concrete is cement, which has its own environmental and social impacts and contributes largely to those of concrete.. The cement industry is one of the main producers of carbon dioxide, a …

Effects of Calcium Silicate Slag on Hydration of ...

Calcium silicate slag (CSS) is waste slag and it contains a large amount of beta-dicalcium silicate. This study is mainly focused on the effect of CSS on the hydration of cementitious pastes. CSS was used to partly replace cement, and composite pastes containing CSS and cement were prepared. The min …

What is Alkali-Activated Slag? | Niumag Corporation

Apr 20, 2019· 1) Carbonation has an adverse effect on the compressive strength of alkali-activated slag cement mortar (concrete). (2) Compared with pure NaOH solution, with the increase of sodium silicate modulus, c-s-h was transformed into a phase with lower Ca/Si, and the compressive strength of the sample was higher.

SOME ENGINEERING PROPERTIES OF SLAG CONCRETE AS …

The results emphasize that even 7-day wet curing was inadequate for high levels of slag replacement, and that continued exposure to a drying environment can have adverse effects on the long-term durability of inadequately cured slag concrete. Availability: Find a library where document is available.

Properties of Hardened Concrete with Blast Furnace Slag

Color of concrete incorporating slag Due to light color of blast furnace slag, color of slag concrete is lighter in comparison with conventional concrete. Moreover, deep blue-green color shown by interior part of slag concrete and can be noticed from slag concrete broken parts, for example, after compressive strength test.

ACI MATERIALS JOURNAL TECHNICAL PAPER

concrete infrastructure. Therefore, adverse effects of industrial waste on durability should be controlled. Engineered cementitious composite (ECC) was identified as a candidate for material greening with the overall goal of improving sustainability. ECC is a high-performance fiber-reinforced cementitious composite (HPFRCC) designed to resist large

Towards Sustainable Self-Compacting Concrete: Effect of ...

Mar 15, 2018· (3) The use of steel slag has an adverse effect on the workability and stability of SCC. This effect increases by the increase of SSA in the mixes. (4) Under the same conditions, up to 50% of the normal coarse aggregate can be replaced by SSA without adverse effects on the stability or flowability of SCC. In other words, most of the criteria ...

Durability of Portland blast-furnace slag cement concrete ...

Durability of Portland blast-furnace slag cement concrete. ... However, a cautionary warning of the importance of good early curing is made to ensure that the adverse effects of higher rates of carbonation, surface scaling and frost attack are minimized. The paper is intended to provide guidance for those concerned with the design ...

Effects of Internal Curing, Slag, and Silica Fume on ...

slag. Therefore, to evaluate the effects of material substi-tutions, comparisons should be based on a volume replace-ment rather than weight basis. Using the work reported in ... slag cement, and a 3 or 6% volume replacement of cement with silica fume are designated as …

Ground Granulated Blast Furnace Slag in Concrete and its ...

The ground granulated blast furnace slag (GGBFS) is a by-product of iron manufacturing which when added to concrete improves its properties such as workability, strength and durability. This material is obtained by the heating of iron ore, limestone and coke at a temperature about 1500 degree Celsius. The process is carried out in a blast furnace.

The Health Risk of SLAG – an Industrial Waste Product ...

The St. Lawrence Cement Company in Camden, New Jersey is doing the same thing that ORCEM proposes to do in Vallejo. It would ship in blast furnace slag and grind it into a very fine powder for use as a cement additive. However, it never called itself a GREEN business or Green Cement. The cement […]

Use of Fly Ash or Slag in Concrete: Proposed PWGSC ...

Use of Fly Ash or Slag in Concrete: Proposed PWGSC Guidelines by Moe Cheung* and Simon Foo** Abstract ... which have adverse effects upon our climate. In 1994, Canada contributed about 615 million metric tonnes of greenhouse gases to the atmosphere, about 2% of the total global emissions. The greenhouse gas of most concern is

CEMENT RAW MATERIALS - International Cement Review

main types of cement used for concrete (Table 1.1.1) and indicates the relative proportions of Portland cement clinker, a second main constituent, the standard (28 day) strength class and the rate of early strength gain. † A jelly-like substance that increases in volume with adverse effects on cement durability and strength.

HEALTH EFFECTS OF OCCUPATIONAL EXPOSURE TO ASPHALT

responsible for adverse health effects observed in exposed workers. Known carcinogens have been found in asphalt fumes generated at worksites. Observations of acute irritation in workers from airborne and dermal exposures to asphalt fumes and aerosols and the potential for …

Effects of granulated blast furnace slag and ...

Apr 01, 2012· The concrete mixtures were prepared with cement CEM I 42.5 with fineness of 3000 cm 2 /g and a specific gravity of 3.15. The granulated slag used a fineness of 3500 cm 2 /g and a specific gravity of 2.95. The physical and chemical properties of cement and slag used and their mineralogical composition are given in Table 1.

(PDF) Effect of Iron Slag and Robodust on the Mechanical ...

In order to decrease carbon dioxide production, minimize the waste materials and to make the concrete eco-friendly and economical, robodust and iron slag has been adopted in …

Broader Use of Steel Slag Aggregates in Concrete

Concrete is the most widely used material on earth after water. Many aspects of our daily life depend directly or indirectly on concrete. Concrete is prepared by mixing various constituents like cement, aggregates, water, etc. which are economically available. Concrete is unique among major construction materials because it is designed

EFFECTS OF BLAST-FURNACE SLAG ON NATURAL …

Keywords: Geopolymer cement, Natural Pozzolan, Granulated blast furnace Slag, Mechanical Properties, Microstructure A number of geopolymer cement mixes were designed and produced by alkali-activation of a pumice-type natural pozzolan. Effects of blast-furnace slag on basic engineering properties of the mixes were studied.

Georgia Chapter ACI Luncheon Benefits of Slag Cement In ...

What Is Slag Cement Where does it come from How it is made How does it react Terminology Specifications For Slag Cement ASTM C989 & AASTHO M 302 ASTM C595 & AASHTO M 240 DOT specifications Slag Cement's Effect On Concrete Typical replacement values Effects on compressive strength Reducing permeability Sulfate attack Mitigation

A Review On Environmental and Health Impacts Of Cement ...

(e.g., fly ash, blast furnace slag, pozzolana, gypsum, and anhydrite) in a cement mill to control the properties of the cement. Combinations of milling techniques including ball mills, roller mills, or roller presses are often applied to ground clinker with additives in …