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Alkali-aggregate reactions in concrete - ScienceDirect

Dec 01, 1975· When gravel aggregates are used many particles show rims caused by weathering of the gravel, long before it was used in concrete. Significant amounts of the microforms of silica, the variety of dolomitic limestone most commonly associated with the alkali-carbonate rock reaction, and rocks of the phyllite-greywacke type, are readily identified.

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Regarding of the detail condition, two kinds of techniques are usually adopted in producing manufactured sand, dry way and wet way. Both methods can produce high quality manufactured sand as concrete aggregate. Especially, the dry way can produce not only the manufactured sand used in SMA road surface, but also the powder used in asphalt concrete.

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What is dolomite? | US Aggregates

Properties of Dolomite. Dolomite is a calcium magnesium carbonate with a chemical composition of CaMg(CO 3) 2. Limestone that contains some dolomite is known as dolomitic limestone. Uses Of Dolomite. Dolomite is chosen for many construction and building product applications due to its hardness and density. A few applications applications are:

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is silicified dolomite rock suitable for coarse concrete aggregate in dam construction. True Dolomite is sourced from rock and requires crushing and screening in order to be used in agriculture or industry. It is a carbonate limestone type product that should contain between 812 Magnesium as Mg and 1822 Calcium as Ca.

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is silicified dolomite rock suitable for coarse concrete aggregate in dam construction. True Dolomite is sourced from rock and requires crushing and screening in order to be used in agriculture or industry. It is a carbonate limestone type product that should contain between 812 Magnesium as Mg and 1822 Calcium as Ca.

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This study evaluated the effects of substituting natural coarse aggregate (dolomite) with air-cooled blast furnace slag (ACBFS) on the strength and durability properties of pavement concretes.

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The two principal uses of limestone in Florida are for concrete aggregate and roadbase. Figure 3 shows the trend of this segment of the industry for the period 1966-1975. About 29.5 million tons, 88 percent of the total of Florida's 1966 limestone production, was mined (in 1966) for use as roadbase and concrete aggregate.

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In general, the use of CLS tends to slightly increase the strength of concrete. For example, Carlos [8] conducted 13 concrete mixtures comprising three W/C ratios of 0.45, 0.55 and 0.65 ...

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erosion of rocks produce particles of stone, gravel, sand, silt, and clay. Recycled concrete, or crushed waste concrete, is a feasible source of aggregates and an economic reality, especially where good aggregates are scarce. Conven-tional stone crushing equipment can be used, and new equipment has been developed to reduce noise and dust.

(PDF) The alkali-carbonate reaction and its reaction ...

Milanesi and co-workers [13, 17,18] used high-porosity dolomite rock in South America to prepare a mortar for rock activity detection. The ACR products of brucite and calcite were detected, but no ...

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How to identify carbonate rock reaction, in concrete ...

The alkali–carbonate reactivity of this rock when used as concrete aggregate has been analyzed. ... Dolomite aggregates exposed to a wet environment may decompose and produce bulking of calcium ...

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(2016) investigated a scheme by replacement of coarse aggregate concrete with three different wastes, ceramic tile materials in replacement ratios 20%, 2 5%, 35%, 5 0%, 65%, 75%, 80% and .

Aggregate Reaction - an overview | ScienceDirect Topics

Quartzite and chert (and flint) are important rock types when considering aggregate for concrete, as they are both commonly used in concrete and are potentially alkali–reactive. Classification of these rocks can be challenging and with this in mind, Hunt (1995) has devised an engineering classification of quartzite and chert to aid alkali ...