Role of additives in ordinary portland cement

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  • OBORTS Company, Opposite the residence of old General Mambou, Near Dragage, Bastos, Yaoundé, Cameroon
    Email: [email protected]

  • CEMENT STABILIZATION ON ROAD BASES

    Jul 14, 2015· Cement Stabilization . Stabilization with cement is a common treatment technology for the safe management, reuse and treatment for disposal of contaminated waste. Portland cement is …

  • Differences Between Portland Cement Concrete and Fly Ash

    The aggregates are typically different types of stone, but the base is most often Portland cement, a mixture of clays, metallic elements and minerals like calcium and silica. While Portland cement can have fly ash in it, fly ash concrete is typically made with a base of full fly ash instead of any Portland cement.

  • Role of Additives in Optimization of Flyash in Cement

    The study showed that with the use of various additives like naphthalene–based superplasticizer, calcium nitrite, calcium formate or blend of these additives. It is possible to load up to 35% of flyash in ordinary Portland cement compared to around 25% of flyash present in Indian portland pozzolana cement.

  • Portland Cement Dust - HSE

    exposure to cement dust, it was felt important that HSE develop an updated position in relation to carcinogenicity. Annex 1 provides a detailed explanation of the composition and manufacture of Portland cement. In brief, Portland cement is produced by crushing and grinding calcareous materials (e.g. limestone, chalk) and argillaceous

  • Cement - The major cements: composition and properties

    Coloured cements are made by grinding 5 to 10 percent of suitable pigments with white or ordinary gray portland cement. Air-entraining cements are made by the addition on grinding of a small amount, about 0.05 percent, of an organic agent that causes the entrainment of very fine air bubbles in a concrete.

  • Influence of mineral additives on the hydration

    Sep 01, 1999· The effect of mineral additives such as fly ash, slags, limestone, and lime sludge on the hydration of ordinary Portland cement (OPC) has been studied. The samples of OPC with 10 wt% mineral additives were examined separately at 28 and 90 days of hydration by X-ray diffraction and differential thermal analysis.

  • Ordinary Portland Cement - an overview ScienceDirect Topics

    According to Portland Cement, Ordinary Portland Cement (GB175-1999), the national standard, the strength grades of ordinary cement can be divided into: 32.5, 32.5 R, 42.5, 42.5 R, 52.5, 52.5 R, and their ages should be no less than the numerical value in Table 4.3.The initial setting time of ordinary cement should not be earlier than 45 min, and final setting time should not be later than 10 h.

  • Role of Additives in Optimization of Flyash in Cement

    The study showed that with the use of various additives like naphthalene–based superplasticizer, calcium nitrite, calcium formate or blend of these additives. It is possible to load up to 35% of flyash in ordinary Portland cement compared to around 25% of …

  • Composition of cement

    Composition of cement. Introduction Portland cement gets its strength from chemical reactions between the cement and water. The process is known as hydration.This is a complex process that is best understood by first understanding the chemical composition of cement.

  • Effect of Al O additives on the corrosion and

    ordinary Portland cement concrete Mosaad Mohamad Sadawy Mining and Petroleum Engineering Department, Al-Azhar University, Nasr City, Cairo, Egypt Email address [email protected] Citation Mosaad Mohamad Sadawy. Effect of Al 2O3 Additives on the Corrosion and Electrochemical Behavior of Steel Embedded in Ordinary Portland Cement Concrete.

  • The Process for Making Portland Cement - Concrete Alberta

    The Process for Making Portland Cement Materials that contain appropriate amounts of calcium compounds, silica, alumina and iron oxide are crushed and screened and placed in a rotating cement kiln. Ingredients used in this process are typically materials such as limestone, sandstone, marl, shale, iron, clay, and fly ash.

  • Alkaline Activity of Portland Cement with Additives of

    The concept of the alkaline activity of powdered materials introduced into cement compositions has been proposed, along with methods for its determination. The possibility of using waste glass as an active additive to Portland cement was evaluated from the standpoint of alkaline activity. Replacing the Portland cement component with glass waste in the form of glass powder at amounts from 1 to

  • Portland Cement - Types, manufacturing & functions of

    May 22, 2013· Assist in the manufacture of Portland Cement by allowing lower clinkering temperature. Also act as a filler Contributes very little strength of concrete eventhough it hydrates very rapidly. Also responsible for grey colour of Ordinary Portland Cement

  • Alkaline Activity of Portland Cement with Additives of

    Mar 01, 2021· The alkaline activity was determined for ordinary Portland cement and additives: container glasses, borosilicate glasses, silica fume. Table 2 represents the alkaline activity results of the investigated materials. These results indicate that the main role played by alkali content is in the potassium alkaline activity of Portland cement.

  • Ordinary Portland Cement: Uses, Advantages & Disadvantages

    Ordinary Portland cement is one of the most widely used cement. The name Portland cement was given by Joseph Aspdin in 1824 due to its similarity in colour and high quality when it hardened like a Portland stone. Portland stone is white grey limestone within the island of Portland, Dorset.

  • Influence of mineral additives on the hydration

    Sep 01, 1999· The effect of mineral additives such as fly ash, slags, limestone, and lime sludge on the hydration of ordinary Portland cement (OPC) has been studied. The samples of OPC with 10 wt% mineral additives were examined separately at 28 and 90 days of hydration by X-ray diffraction and differential thermal analysis.

  • Cement hydration: the role of adsorption and crystal growth

    The finely powdered mixture of clinker and gypsum is marketed as standard Portland cement (PC, often called ordinary Portland cement), which is then mixed with water. The mass ratio of water to cement, w/c, typically ranges from 0.3 to 0.5, although sufficient water to fully react with cement would require w/c to be about 0.38 or greater.

  • The Role of Additives in Soil-Cement Subjected to Wetting

    The cement used was the ordinary Portland type I, while the additive utilized was for commercial purposes, and predominantly contained CaCl 2. This research was conducted by testing the optimum cement content for each soil to determine the shear strength according to Indonesian standards (i.e., minimum Unconfined Compressive Strength of 2400 kPa).

  • Roles Of Cement Additives In Ordinary Portland Cement

    Ordinary Portland Cement an overview ScienceDirect Topics . According to Portland Cement, Ordinary Portland Cement GB175-1999, the national standard, the strength grades of ordinary cement can be divided into 32.5, 32.5 R, 42.5, 42.5 R, 52.5, 52.5 R, and their ages should be no less than the numerical value in Table 4.3.The initial setting time of ordinary cement should not be earlier than 45

  • How Cement Is Made - Portland Cement Association

    Portland cement is the basic ingredient of concrete. Concrete is formed when portland cement creates a paste with water that binds with sand and rock to harden. Cement is manufactured through a closely controlled chemical combination of calcium, silicon, aluminum, iron and other ingredients.

  • Portland Cement Composition

    May 04, 2017· One of these A is a cement with abnormally high silica (33.01 per cent.) and low lime (52.73 per cent.); the other B falls within the units of the composition usually set for Portland cement, but it also is a high in silica and too low in lime. Hydration Products of Portland Cement

  • The hydration of an Ordinary Portland Cement (OPC) and …

    Today Ordinary Portland Cement (OPC) is an important product in our daily life and it is an irreplaceable part of numerous other products. It is the basis of many products of the building industrysuch as concrete and dry-mix-mortars. The worldwide production of Ordinary Portland Cement amounts to almost 3 billion tons a year.

  • Role of Additives in Optimization of Flyash in Cement

    Jun 12, 2009· The study showed that with the use of various additives like naphthalene–based superplasticizer, calcium nitrite, calcium formate or blend of these additives. It is possible to load up to 35% of flyash in ordinary Portland cement compared to around 25% of flyash present in Indian portland pozzolana cement.

  • “The effect of aluminous additives on the properties of

    “The effect of aluminous additives on the properties of With the removal of the asbestos fibre the role of the filter fibre was taken up by the Ordinary Portland cement was usually about 300m2/kg a relatively coarse grind by today's standards.

  • Ordinary Portland Cement - Tests, Properties, Manufacture

    Jun 09, 2017· Cement can be defined as the bonding material having cohesive & adhesive properties which makes it capable to unite the different construction materials and form the compacted assembly. Ordinary/Normal Portland cement is one of the most widely used type of Portland Cement. The name Portland cement was given by Joseph Aspdin in 1824 due to its similarity in

  • Cement Chemistry and Additives - Schlumberger

    Cement evaluation logs and other cased-hole logs can indicate the strength of the set cement and whether it "s bonded to the cas.ng (far right). The out- come of a cementing job, however, depends ultimately on choosing the appropriate cement and additives to cope with particu lar well conditions. . Portland cement was developed by Joseph Aspdin

  • Hydration of Portland Cement - Penn State College of

    Hydration of Portland Cement. Introduction Portland cement is a hydraulic cement, hence it derives its strength from chemical reactions between the cement and water. The process is known as hydration. Cement consists of the following major compounds (see composition of cement): Tricalcium silicate, C 3 S; Dicalcium silicate, C 2 S; Tricalcium

  • The Role of Additives in Soil-Cement Subjected to Wetting

    The cement used was the ordinary Portland type I, while the additive utilized was for commercial purposes, and predominantly contained CaCl 2. This research was conducted by testing the optimum cement content for each soil to determine the shear strength according to Indonesian standards (i.e., minimum Unconfined Compressive Strength of 2400 kPa).

  • Effect of Glass Fibres on Ordinary Portland cement Concrete

    The ingredients of cement primarily consist of calcareous materials in the form of limestone, chalks and marl and argillaceous materials. The ordinary Portland cement of 53 Grade is used. The specific gravity of cement is 3.15. For ordinary Portland cement, the initial setting time is 55 minutes and the final setting time is 600 minutes. Aggregate

  • How Portland Cement is Made? Manufacturing Process of

    Aug 31, 2009· Portland cement can be made by following two different processes – a dry one and a wet one. Joseph Aspdin first made portland cement in his kitchen stove in England in the 19th century. Lime and silica make up approximately 85% of portland cement. The materials that are commonly used are limestone, shells, chalk, shale, clay, slate, silica sand, and iron ore.

  • Microstructure of Concrete IntechOpen

    Oct 05, 2016· In addition to ordinary Portland cement, the essential components of the base of concrete are aggregate and water. For practical requirements, additives with various particle sizes and specific surface areas can be added to the raw materials to …

  • Ordinary Portland Cement (OPC) & Portland Pozzolana Cement

    Jan 25, 2018· Ordinary Portland Cement (OPC) the most widely and commonly used cement in the world. This type of cement is manufactured to powder by mixing limestone and other raw materials which consist of argillaceous, calcareous and gypsum. It is preferred in places where there is need of fast construction. This cement is available in the market in three

  • What are the ingredients in Portland cement?

    Mar 24, 2020· The Portland cement is the most basic and the most commonly used cement in the world the Portland cement was formerly known as ordinary Portland cement and is made by adding gypsum into the clinker. Concrete is made by adding the Portland cement , water and gravel and sand.

  • An Additive For Use In Ordinary Portland Cement - Patent

    Sep 09, 2018· This invention relates to an additive for use in ordinary portland cement capable of replacing upto 30% of ordinary portland cement comprising flyash and at least a plasticizer and further this invention relates to a process for the preparation of an additive for use in ordinary portland cement and capable of replacing upto 30% of ordinary portland cement comprising in the steps of …

  • Introductory Chapter: Properties and Applications of

    Oct 10, 2018· Ordinary Portland Cement (OPC) is the most widely used cement. It is prepared by crushing, milling, and mixing calcium, iron, silica, alumina, and sulfate sources with certain amounts. Then, hydraulic cement is passed to the kiln to produce clinker, which is …

  • 4 PRIMARY CEMENT COMPOUNDS & THEIR ROLES - …

    Jul 14, 2017· Compounds of Cement cement compounds. About 90-95% of a Portland cement is comprised of the four main cement minerals, which are C 3 S, C 2 S, C 3 A, and C 4 AF, with the remainder consisting of calcium sulphate, alkali sulphates, unreacted (free) CaO, MgO, and other minor constituents left over from the clinkering and grinding steps.The four cement minerals play very different roles …