Manufacture of Light-weight Aggregate Utilizing Coal Fly Ash.

This research deals with production of light weight aggregate concrete by using clayey stone aggregate, normal material (cement , sand) and some of mineral admixtures (fly ash and steel fiber ). Many trial mix were doing some of these by weighing ratio and others by volumetric ratio . We get light weight aggregate concrete (LWAC) with 24.92 N/ mm2 compressive strength and we improved mechanical properties by adding same percentage of fly ash and steel fiber (0.5 ,1 ,1.5) % of each other as a percentage weighing ratio of cement content . compressive strength increased with (7.8 , 5.2 , 2.9) % , splitting tensile strength increased with (20 ,16.71, 12)% and flexural strength increased with (24.5 , 17.9 , 8) % when adding (0.5 ,1 ,1.5) % of each steel fiber and fly ash respectively. The practical results of the current study indicates that the using clayey stone to produce (LWAC) is success and we can improved mechanical properties of this (LWAC) was produced in this research by adding fly ash and steel fiber with previously percentage.

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Effect of Mineral Additives on Internal Relative Humidity and Dry Shrinkage of Light Weight Aggregate Concrete

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.857.51 ◽

2013 ◽

Vol 857 ◽

pp. 51-55

Author(s):

Shu Hui Dong ◽

Yong Ge ◽

De Cheng Feng ◽

Feng Ping Wang ◽

Bao Sheng Zhang

Keyword(s):

Fly Ash ◽

Relative Humidity ◽

Shrinkage Rate ◽

Light Weight ◽

Aggregate Concrete ◽

Fly Ash Concrete ◽

Internal Relative Humidity ◽

Dry Shrinkage ◽

Mineral Additives ◽

Light Weight Aggregate

Effect of fly ash and slag on internal relative humidity (IRH) and dry shrinkage of light weight aggregate concrete (LWC) are studied in this paper. As indicated in this test, mixed with mineral additives can reduce dry shrinkage of concrete. The more volume of fly ash and slag ash, the lower decrease speed of IRH is, which contribute to the decreases of dry shrinkage rate too. At the same curing-age and dosage, the relative humidity inside the fly ash concrete is higher than the slag one. As consequence, the rate of dry shrinkage of fly ash concrete is lower than slag concrete. Also, there is a significant linear correlation between the lowered values of IRH and dry shrinkage rate.

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A review on the effects of artificial light weight aggregate in concrete

Sustainability Agri Food and Environmental Research ◽

10.7770/safer-v10n1-art2461 ◽

2021 ◽

Vol 10 (1) ◽

Author(s):

Raj K Rhishi ◽

R. Vasudev

Keyword(s):

Fly Ash ◽

Lightweight Aggregate ◽

Artificial Light ◽

Light Weight ◽

Complete Replacement ◽

Coarse Aggregates ◽

The Impact ◽

Cold Bonding ◽

Light Weight Aggregate ◽

By Products

The disposal problem of industrial by-products like fly ash, heavy metal sludge, sewage sludge etc. are increasing day by day. To use by-products in large volume the applications like embankment fill or aggregate replacement material should be considered for sustainable development. This study is focused on properties of artificial light weight aggregate on concrete and the effect of cold bonded light weight aggregate on concrete through partial and complete replacement of coarse aggregates. Artificial Lightweight aggregate can be produced by nodulizing the by-product for example fly ash in a pelletizer with a proportionate quantity of water, cement and further hardened by cold bonding or sintering. Due to the impact of earth quake forces all over the world, the need for light weight structural design is increasing presently, as it reduces mass of the structure. The concrete produced is light weight in nature and has added the benefit of reducing overall cost, especially in transportation and placing etc. it has its own advantages like reduced dead load, and thus economic structures, high sound absorption and good fire resistance. Keywords—Artificial light weight aggregate, cold bonding, Fly ash, Fly ash aggregate, Pelletization, and Sintering.

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