Aggregate impact value and aggregate crushing value tests on seven lithologies from the carboniferous limestone of the Bristol/Mendip area, England

1991 ◽  
Vol 28 (2-3) ◽  
pp. A138
Keyword(s):  
Carboniferous Limestone ◽  
Aggregate Impact Value ◽  
Aggregate Crushing

scholarly journals Assessment of Rock Aggregate for Construction Using Comminution Theory

2019 ◽  
Vol 4 (2) ◽  
Author(s):  
Oluwole D Adigun ◽  
Babatunde Adebayo ◽  
Olugbenga Amu
Keyword(s):  
Granite Gneiss ◽  
Aggregate Production ◽  
Porphyritic Granite ◽  
Rock Materials ◽  
South West ◽  
Work Index ◽  
Rock Aggregate ◽  
Bond Work Index ◽  
Aggregate Impact Value ◽  
Aggregate Crushing

In this research, grinding energy of selected rock samples collected from South West Nigeria was determined using comminution theory in order to evaluate suitability of rock for aggregate production. Bond Work Index (BWi), Aggregate Impact Value (AIV) and Aggregate Crushing Value (ACV) of samples was characterized and correlated. The work index of the charnockitic rock, granite gneiss, porphyritic granite –labelled PG1 and porphyritic granite –labelled PG2 of samples was found to be 17.12 kWh/t, 13.72 kWh/t, 13.64 kWh/t and 12.76 kWh/t respectively. The ACV of the charnockitic rock, granite gneiss, porphyritic granite (PG1) and porphyritic granite (PG2) was determined to be 26.2 %, 27.3 %, 27.6 % and 27.8 % respectively; while the AIV of the samples, in same order, was 11.2 %, 13.2 %, 19.1 % and 18.4 % respectively. Following high correlation coefficient of 0.98% between BWi and ACV, hardness of rock materials are classified as ‘very difficult’, ‘difficult’, ‘medium’, ‘easy’ and ‘very easy’ for grinding energies in the range of >18 kWh/t, 14-18 kWh/t, 10-14 kWh/t, 7-10 kWh/t and 0-7 kWh/t respectively. Based on the classification, rock materials with grinding energy >10 kWh/t could be suitable for aggregate production and usable for civil construction purposes.Keywords- Aggregate,  Aggregate impact value, Aggregate crushing value, Comminution, Grinding energy. 

The Metamorphosed Limestones and Associated Contaminated Igneous Rocks of the Carlingford District, Co. Louth

1932 ◽  
Vol 69 (5) ◽  
pp. 209-233 ◽  
Author(s):  
G. D. Osborne
Keyword(s):  
Igneous Rocks ◽  
The South ◽  
Ordnance Survey ◽  
Igneous Complex ◽  
North East ◽  
The North ◽  
South West ◽  
Carboniferous Limestone ◽  
Contamination Effects

THE Carlingford-Barnave district falls within the boundaries of Sheet 71 of the Ordnance Survey of Ireland, and forms part of a broad promontory lying between Carlingford Lough on the north-east and Dundalk Bay on the south-west. The greater part of this promontory is made up of an igneous complex of Tertiary age which has invaded the Silurian slates and quartzites and the Carboniferous Limestone Series. This complex has not yet been investigated in detail, but for the purposes of the present paper certain references to it are necessary, and these are made below. The prevalence of hybrid-relations and contamination-effects between the basic and acid igneous rocks of the region is a very marked feature, and because of this it has been difficult at times to decide which types have been responsible for the various stages of the metamorphism.

scholarly journals V.—On Goniatites Evolutus, Phillips and Nautilus Tetragonus, Phillips; With a list of the Species Belonging to the Genus Subclymenia

1896 ◽  
Vol 3 (9) ◽  
pp. 413-419 ◽  
Author(s):  
G. C. Crick
Keyword(s):  
Carboniferous Limestone

In 1836, Prof. J. Phillips described and figured from the Carboniferous Limestone, Goniatites evolutus, and for this species D'Orbigny, in 1850, instituted the genus Subclymenia.

scholarly journals III.—On Temnocheilus Coronatus, M'Coy, from the Carboniferous Limestone of Stebden Hill, near Cracoe, Yorkshire

1894 ◽  
Vol 1 (7) ◽  
pp. 295-298 ◽  
Author(s):  
Arthur H. Foord ◽  
G. C. Crick
Keyword(s):  
Geological Survey ◽  
The Subject ◽  
Carboniferous Limestone

The specimens which form the subject of this paper were obtained by Mr. E. J. Garwood from the Carboniferous Limestone of Stebden Hill, near Cracoe, Yorkshire; and the writers are indebted to the kindness of Mr. Garwood for permission to describe them. Respecting the horizon and locality from which the species came, Mr. Garwood says, in a letter to one of the writers: “Stebden is a hill which Tiddeman [of the Geological Survey] describes as one of his knoll reefs

V.—On the Shell-Structure of Chonetes Laguessiana, De Kon

1883 ◽  
Vol 10 (8) ◽  
pp. 368-371
Author(s):  
John Young
Keyword(s):  
Shell Structure ◽  
The Other ◽  
Lower Carboniferous ◽  
Carboniferous Limestone

The specimens selected for illustration of the shell-structure of this species of Chonetes were found in a bed of shale in the Lower Carboniferous Limestone series at Capelrig old quarry, in the parish of East Kilbride, Lanarkshire. The fossils in this shale have their structure generally well preserved, there being less change, through crystallization of the lime present in the shells of the various organisms, than is found in those obtained from most of the other fossiliferous localities in Western Scotland.

scholarly journals VIII.—The Range of Species in The Carboniferous Limestone of North Wales

1897 ◽  
Vol 4 (3) ◽  
pp. 132-134
Author(s):  
G. H. Morton
Keyword(s):  
North Wales ◽  
Carboniferous Limestone

Attention having recently been directed to this subject, I have been induced to present the results of many years' collecting in the Carboniferous Limestone of North Wales. The formation there presents four well-defined subdivisions, each of them, with the exception of the highest, having distinct lithological characters, viz.: Lower Brown Limestone, Middle White Limestone, Upper Grey Limestone, and the Upper Black Limestone. Lists of the fossils have been made, collected more or less continuously along the country from each subdivision.

2. Communication relative to the Fresh-Water Limestone of Burdiehouse, near Edinburgh, belonging to the Carboniferous Group of Rocks

1845 ◽  
Vol 1 ◽  
pp. 33-35 ◽  
Author(s):  
Hibbert
Keyword(s):  
Fresh Water ◽  
Marine Origin ◽  
North East ◽  
South West ◽  
Water Origin ◽  
The Common ◽  
Firth Of Forth ◽  
Carboniferous Limestone

In his paper, the author explains that the limestone in question, which is confounded with the common carboniferous or mountain limestone of marine origin, is, in his opinion, of fresh-water origin.On an irregular line extending from Joppa on the coast of the Firth of Forth, in a south and south-west direction to the Pentland Hills, strata of mountain or carboniferous limestone crop out at intervals; and their marine origin is indicated by encrinites, the Productus, &c., and corallines. This limestone is developed with least interruption between Edmonstone and Muirhouse, where it is from twelve to twenty feet thick. At this part of the line may be seen fractures and elevations of the strata of limestone and superincumbent shale and sandstone, evidently occasioned by a sudden and violent uplifting force acting from north-east to south-west, and causing the uplifted strata to dip south-east at an angle of 25°. These uplifted beds, between Edmonstone and Muirhouse, and subsequently to Burdiehouse, form the strata which dip under the coalmeasures of Gilmerton, Loanhead, and other sites.

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