Alkali Silica Reaction - Blog - MEKA Case Study

    Cement is the main source of alkaline in concrete. However, fly ash with an alkali content of more than 5% increases the level of alkali in the concrete. Some chemical additives and mixing water (especially salty water) increase the alkali content.

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    Factors Which May Influence Air Content - RussTech · PDF file

    FACTORS WHICH MAY INFLUENCE AIR CONTENT Air contents are an extremely important facet of today's concrete mix design criteria and subsequent in-place concrete performance and durability characteristics. A well designed concrete mix design with adequate air contents delivered by your company and placed by a

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    (PDF) Investigation of effects of Portland cement fineness ...

    Furthermore, while decreasing crack tendency was noted as alkali content increased from 0.4 to 0.8% by mass of cement, further increases in alkali content caused significant decreases of ...

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    Chemical properties of the alkali metals - Group 1 - the ...

    of these metals increases going down the group. This pattern is seen with all reactions of group 1 elements. For example, the reaction of caesium with chlorine is more vigorous than the reaction ...

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    The effect of alkali metals on combustion and pyrolysis of ...

    Also, it was found that as the lignin content increases, the metal content (especially potassium and sodium) decreases. Furthermore, the char yield from pyrolysis (measured at 773 K from TGA pyrolysis traces) increases as metals increase, and hence char yield increases as the lignin content decreases. Py-GCMS showed that peak intensities varied ...

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    Milk-Alkali Syndrome: Symptoms, Causes, and Diagnosis

    Milk-alkali syndrome is a potential consequence of developing high levels of calcium in your blood. Too much calcium in your bloodstream is called hypercalcemia.. Taking in calcium with an alkali ...

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    Alkali Content of Fly Ash – Measuring and Testing ... · PDF file

    Alkali Content of Fly Ash – Measuring and Testing Strategies for Compliance Abstract Sodium and potassium are the common alkalis present in fly ash. Excessive amounts of fly ash alkalis can cause efflorescence problems in concrete products and raise concern about the effectiveness of the fly ash to mitigate alkali-silica reaction (ASR). The ...

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    Effect of alkali content of cement on properties of high ...

    The test results showed that when the alkali content of cement was higher than 0.70%, the workability of HPCMs decreased significantly as the alkali content increased. An increase in the alkali ...

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    Alkali–silica reaction - Wikipedia
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    Group 1: Properties of Alkali Metals - Chemistry LibreTexts

    19/09/2017 · Atomic radius increases down a group, so the volume of the atoms also increases. Fewer sodium atoms than lithium atoms, therefore, can be packed into a given volume. However, as the atoms become larger, their masses increase. A given number of sodium atoms will weigh more than the same number of lithium atoms.

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    Alkali-induced agglomeration of aluminosilicate particles ...

    This study focuses on the effect of alkali adsorption on the agglomeration of particles of bauxite, kaolinite, emathlite, lime, and two types of coal ash. An agglomeration (adhesion) temperature is defined which characterizes the adhesion propensity of particles. Using a small fluidized bed, a ...

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    Microscopic and Chemical Methods of Diagnosis of Alkali ... · PDF file

    2.2.4 Concrete Alkali Content The potential for ASR increases as the alkali content of concrete increases. Using field performance as a guide, alkali limits are established in concrete to control ASR. The approach is most applicable with concrete using Portland cement as .

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    Alkali Content of Concrete Mix Water and Aggregates · PDF file

    compounds may increase the pH of water when they dissolve, not all of them will. The pH change they produce is too small to be a reliable measure of alkali content in concrete or wash water. Thus ASR is managed by directly controlling the alkali metal content of the concrete, i.e. its "alkali content", not its pH or its alkalinity.

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    Investigation of effects of Portland cement fineness and ... · PDF file

    18 cracking. Similar effects were observed for alkali contents which resulted in increased levels of plastic 19 shrinkage. Furthermore, while decreasing crack tendency was noted as alkali content increased from 20 0.4 to 0.8% by mass of cement, further increases in alkali content caused significant decreases of

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    SURFACE TENSION OF THE ALKALI METALS. (Journal Article ...

    The effects of alkali adsorption on the agglomeration characteristics of the substrates are determined. The agglomeration temperature of all substrates decreases as the alkali content increases. At low alkali loadings, alkali adsorption enhances particle agglomeration by forming new compounds of .

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    Alkali Aggregate Reaction in Concrete - Types, Causes, and ...

    In the areas of cold weather, de-icing salt containing sodium compounds which may increase the alkali content on the surface layer of concrete. Soils containing alkali may also increase alkali content on the surface of concrete. Effects of Alkali-Aggregate Reaction. Loss of strength, stiffness, impermeability; Affects concrete durability and ...

    Author: Madeh Izat Hamakareem
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    Effect of alkali content of cement on properties of high ...

    The test results showed that when the alkali content of cement was higher than 0.70%, the workability of HPCMs decreased significantly as the alkali content increased. An increase in the alkali ...

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    alkali content - German translation – Linguee

    While the effective alkali content of Portland cements rises in line with an increase in the total alkali content, the effective alkali content of cements containing several main constituents may deviate from their total alkali content to varying degrees.

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    BRE Digest 330: Alkali-silica reaction in concrete – the ... · PDF file

    ing ASR as the level of cement alkali increases. It gives no rationale as to why no safety margin is applied to the classification of cement as 'low' alkali while, for its clas-sification of cement as 'high' alkali, applying a 25% safety margin. There is no logic to this latter as this 25% margin is applied in addition to limiting the overall alkali content of concrete with 'high ...

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    Alkalis Content - an overview | ScienceDirect Topics

    The decrease in the alkali content of the pore solution is parallel with the increase in the alkali content of the solid phases (Figure 10.89). 476 Pozzolana reduces the C/S ratio of C-S-H and this allows more alkalis to be incorporated in calcium silicate hydrates (Figure 10.90). 480 About 95 per cent of the total alkali content can be retained by blended cement pastes, where only ∼ 15 per ...

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    Investigation of effects of Portland cement fineness and ...

    Furthermore, while decreasing crack tendency was noted as alkali content increased from 0.4 to 0.8% by mass of cement, further increases in alkali content caused significant decreases of compressive strength and slump; thereby lowering overall concrete performance. It is also found that plastic shrinkage cracking is closely related to the ...

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