Impact resistance of concrete produced with plain and reinforced cold-bonded fly ash aggregates

Aggregates are popular for use in concrete and lightweight concrete applications. Recent research shows that the by-product materials such as fly ash can be used as raw material in producing aggregates and lightweight aggregates. The usage of this material can improve the quality of the aggregates produced compared to conventional in term of structurally strong, physically stable, durable, and environmentally inert. This paper summarized the process and mechanical testing on the fly ash aggregates and lightweight aggregates to be used in concrete.

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Comparative Study of Self-Compacting Concrete Containing Lightweight and Normal Aggregates

Slovak Journal of Civil Engineering ◽

10.2478/sjce-2019-0009 ◽

2019 ◽

Vol 27 (2) ◽

pp. 1-8

Author(s):

Ramamohanrao Pannem ◽

Padmaja P. Kumar

Keyword(s):

Fly Ash ◽

Fresh Concrete ◽

Void Content ◽

Self Compacting Concrete ◽

Simple Method ◽

Coarse Aggregates ◽

Concrete Properties ◽

Round Shape ◽

Fine Aggregates ◽

Ash Aggregates

AbstractBased on the available literature, a simple method was adopted to calculate the packing density of aggregates and thereby reduce their void content by optimising their packing aggregates and by using two different sizes of coarse aggregates and fine aggregates. This study provides an understanding of the way in which the shape of aggregates affects the properties of self-compacting concrete (SCC). The fresh, hardened, and durable properties of SCC with normal and lightweight fly ash coarse aggregates are found at the corresponding age of the curing. Their values were compared with respect to SCC containing normal aggregates. A mix with fly ash aggregates was found to have better fresh concrete properties due to the round shape of the aggregates. After the packing of the aggregates, this mix was found to have better mechanical and durability properties than all the other concrete mixes.

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Synthesis of Geopolymer Based Class-F Fly Ash Aggregates and its Composite Properties in Concrete

Archives of Civil Engineering ◽

10.2478/ace-2014-0003 ◽

2014 ◽

Vol 60 (1) ◽

pp. 55-75 ◽

Cited By ~ 6

Author(s):

P. Gomathi ◽

A. Sivakumar

Keyword(s):

Mechanical Properties ◽

Fly Ash ◽

Physical And Mechanical Properties ◽

Engineering Properties ◽

Polymerization Reaction ◽

Hardened Concrete ◽

Different Types ◽

Class F Fly Ash ◽

Ash Aggregates ◽

Class F

Abstract This study explores the influence of alkali activators on the initiation of polymerization reaction of alumino-silicate minerals present in class-F fly ash material. Different types of fly ash aggregates were produced with silicate rich binders (bentonite and metakaolin) and the effect of alkali activators on the strength gain properties were analyzed. A comprehensive examination on its physical and mechanical properties of the various artificial fly ash aggregates has been carried out systematically. A pelletizer machine was fabricated in this study to produce aggregate pellets from fly ash. The efficiency and strength of pellets was improved by mixing fly ash with different binder materials such as ground granulated blast furnace slag (GGBS), metakaolin and bentonite. Further, the activation of fl y ash binders was done using sodium hydroxide for improving its binding properties. Concrete mixes were designed and prepared with the different fly ash based aggregates containing different ingredients. Hardened concrete specimens after sufficient curing was tested for assessing the mechanical properties of different types concrete mixes. Test results indicated that fly ash -GGBS aggregates (30S2-100) with alkali activator at 10M exhibited highest crushing strength containing of 22.81 MPa. Similarly, the concrete mix with 20% fly ash-GGBS based aggregate reported a highest compressive strength of 31.98 MPa. The fly ash based aggregates containing different binders was found to possess adequate engineering properties which can be suggested for moderate construction works.

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