Strength properties of concrete by replacing coarse aggregate. Musfa bin mohamad a project report submitted in partial fulfillment of the requirements for the award of the degree of master of engineering civil structure faculty of civil engineering universiti teknologi malaysia april, 2005. The function of the coarse aggregate is to act as the main loadbearing component of the concrete. Imported limestone and gabbro aggregates are widely employed for various construction activities in qatar. Gabbro is any of several medium or coarsegrained rocks that consist primarily. Gabbro is an aggregate type used by the construction industry in qatar to replace the local limestone aggregate. Results showed a significant increase in compressive, tensileand flexural strength when using gabbro as fine and coarse aggregates, comparingwith normal aggregate. Through this mix of materials, three quarter of the blend is administered by aggregate. For more information about this series please see the. Imported limestone and gabbro aggregates are widely employed for various. The most common use of gabbro is as a crushed stone or aggregate. Gabbro gabbro is an aggregate type used by the construction industry in qatar to replace the local limestone aggregate. However, it is well recognize that physical, chemical and thermal properties of aggregate substantially influence the properties and performance of concrete. The distribution of the coarse aggregates was equivalent to din.
Aggregate is a granular material, such as sand, gravel, crushed stone, crushed hydrauliccement concrete, or iron blastfurnace slag, used with a hydraulic cementing medium to produce either concrete or mortar. The physiochemical properties of studied coarse aggregates were bench. Aggregates are inert fillers floating in the cement paste matrix for concretes of low strength. Strength properties of concrete by replacing coarse aggregate by gabbro rocks. Aggregates types of aggregates coarse aggregate, fine.
The trials also incorporated replacement of 60% of the local washed sand with imported crushed rock fines. Pdf physiochemical characterization of coarse aggregates in. Results showed a significant increase in compressive, tensileand flexural strength when using gabbro as fine and coarse aggregates, comparingwith normal aggregate concrete. In addition, recycled concrete aggregates rca are produced since 2009 as a result of the extensive construc. Gabbro is formed when molten magma is trapped beneath the earths surface and cools slowly.
Concrete is comprised of aggregate, concrete and water. In this study, the scope of research will be focused on the use of coarse aggregate using gabbro rock material. Transportation mndot specifies that coarse aggregate used for concrete pavement shall conform to one of the following classifications. Additionally different materials like gabbro, limestone, granite and river aggregate fig. This gabbro has a lot of coarse, dark pyroxene crystals in it. Using gabbro rocks concrete higher compressive strength and its properties of concrete. Site trials of recycled and secondary aggregates in. If the fineness modulus is constant, the volume of coarse aggregate increase with size of the aggregate, or with the decrease in surface area of the coarse aggregate the main cause in variation in weight of cube found to be specific gravity of coarse aggregate. A manual for design of hotmix asphalt with commentary incorporates the many advances in materials characterization and hotmix asphalt hma mix design technology developed since the conclusion of the strategic highway research program shrp. Gabbro is sometimes called black granite for it too is coarsegrained, but a large proportion of ironbearing minerals make gabbro heavier and dark colored. Directory of gabbro aggregate and fine sand importers provides list of gabbro aggregate and fine sand buyers, purchasers and buying agents looking to source gabbro aggregate and fine sand from global suppliers. Before further discussion, it shall be better to have knowledge and clear understanding about the gabbro rock material and its properties and performances. The standard testing procedure for this is the american society of testing.
Unfortunately, this book cant be printed from the openbook. One concrete mix that contained 100% gabbro coarse aggregate was kept as the control mix g20100. Gmbtl, karlsruhe, germany based on the icdd powder diffraction file of pdf2 2006. Slowcooling, coarsegrained gabbro is chemically equivalent to rapidcooling, finegrained basalt. C 702 practice for reducing samples of aggregate to testing size d 75 practice for sampling aggregates d 448 classi. We could supply gabbro coarse and fine aggregate from iran our gabbro aggregate is suitable for concreatebeton,road base,asphalt, ballast for speed train. Crushed gabbro is used as a base material in construction projects, as a crushed stone for road construction, as railroad ballast, and anywhere that a durable crushed stone is needed as fill. Buy high quality aggregate gabbro limestone by geetendra rajora. Aggregate is a collective term for the mineral materials such as sand, gravel and crushed stone that are used with a binding medium such as water, bitumen, portland cement, lime, etc. Some natural aggregate deposits, called pitrun gravel, consist. Establishing a stable production process may reduce variability of the product. To improve the workability, many mixes contain both angular and round particles. The strength of aggregates do not contribute to the strength of concrete for low strength concrete. If there is an insignificant discrepancy between the original total.
Assessment of blending local and imported aggregates on. Physiochemical characterization of coarse aggregates in qatar. Effect of specific gravity on aggregate varies the weight. It means that it formed as magma cooled slowly in the crust. Classification of aggregates based on shape and size such as coarse and fine aggregates are discussed here, aggregates are the important constituents of the concrete which give body to the concrete and also reduce shrinkage. We could supply gabbro coarse and fine aggregate from iran. The fine aggregate serve the purpose of filling all the open space in between the coarse particles. The effect of petrographic characteristics and physico. Our gabbro aggregate is suitable for concreatebeton,road base,asphalt, ballast for speed train. The aggregate itself is arranged as fine and coarse aggregate.
Coarse aggregate is also described by its bulk density, which is a property that can easily be tested in the laboratory. Types of aggregates include coarse aggregate and fine aggregate. There are many kinds of minerals and rocks found in the world. Abstract a lot of materials could be used as an admixture or even as an essential part of concrete, the aim of this study is to use the gabbro rocks as. Geological surveyfor their support of this book and of the environmental awareness series.
Coarse aggregate, compressive strength, fine aggregate, gabbro concrete. Results showed a significant increase in compressive, tensileand flexural strength when using gabbro as fine and coarse aggregates, comparingwith normal. There is also a lot of plagioclase, but it is tough to spot because it is also quite dark. Aggregate properties and the performance of superpave. The aggregate of each type is further subdivided into many types and.
Strength properties of concrete by replacing coarse. The ew was used to replace 50% of the coarse aggregate in structural c40 concrete, with the cdw replacing 50% and iba 20% of the coarse aggregate in nonload bearing concrete blocks. Igneous rocks with similar composition are basalt extrusive equivalent of gabbro and diabase the same rock type could be named dolerite or microgabbro instead. Results showed a significant increase in compressive, tensile and flexural strength when using gabbro as fine and coarse aggregates, comparing. In the series 1 and 2 the coarse aggregate distributions had a maximum diameter ranging from 8 mm to 32 mm tab.
Hence, it comes as no surprise that imported gabbro is the main source of coarse aggregates in qatar, prevalently used in the construction industry. Classification of aggregates based on size and shape coarse. Why use aggregate reduce the cost of the concrete 14 18 of the cement price reduce thermal cracking 100 kg of opc produces about 12oc temperature rise reduces shrinkage 10% reduction in aggregate volume can double shrinkage high aggregate. Physiochemical characterization of coarse aggregates in.
Soundness of aggregate using sodium sulfate or magnesium sulfate txdot designation. Feb 01, 2014 the function of the coarse aggregate is to act as the main loadbearing component of the concrete. Musfa bin mohamad a project report submitted in partial fulfillment of the requirements for the award of the degree of master of engineering civil structure. What is the difference between granite marble basalt diorite gabbro rhyolite quartz silestone. These crushed dark stone particles are not produced in qatar and they are barged mainly from the united arab emirates and the sultanate of oman in the form of coarse aggregates.
Mecanical propeties of gabbro aggregate concrete request pdf. Physiochemical characterization of coarse aggregates. Coarse aggregate geological type fine aggregate types 1 kaitaia pukepoto andesitegabbro naturalcrusher 2 whangarei firth greywacke naturalcrusher 3 hunua firth greywacke naturalcrusher 4 bombay holcim basalt naturalcrusher 5 pukekawa firth basalt naturalcrusher 6 hamilton firth greywacke rivercrusher. Site trials of recycled and secondary aggregates in concrete. Coarsegrained, darkcolored mafic intrusive rocks may be identified as traprock or black granite by the aggregate. Extraction with the exception of slag and other manufactured aggregates most materials for aggregate production come from bedrock or unconsolidated deposits. Aggregate which occupy nearly 80 to 85 % volume of concrete are most important part of the concrete or rcc. The rocks will be dark in color, somewhat heavier than granitic rocks and devoid of quartz. Gabbro is any of several medium or coarse grained rocks that consist primarily. Four concrete mixes containing 100%, 75%, 50%, and 25% as partial replacement of gabbro aggregate with slag aggregate, by weight were designated as s20100, s2075, s2050 and s2025, respectively. Based on the results of the physiochemical characterization of coarse aggregates, imported gabbro was found to meet all the physical, mechanical and chemical limits of qcs 2010.
The shiny cleavage planes in the upper park of this sample are all plagioclase. Physiochemical characterization of coarse aggregates in qatar for. The characteristics of aggregates impact performance of fresh and hardened. Coarse aggregate geological type fine aggregate types 1 kaitaia pukepoto andesite gabbro naturalcrusher 2 whangarei firth greywacke naturalcrusher 3 hunua firth greywacke naturalcrusher 4 bombay holcim basalt naturalcrusher 5 pukekawa firth basalt naturalcrusher 6 hamilton firth greywacke rivercrusher.
The concrete mixtures incorporate either basalt or crushed limestone, aggregate sizes of 12 mm h in. We could supply gabbro coarse and fine aggregate from iran our gabbro aggregate. Tr 11 properties of new zealand concrete aggregates. Agi gratefully acknowledges the agi foundation and the u. Gabbro is widely used as crushed stone for concrete aggregate, road base material, and railroad ballast. Gabbro is a coarse grained and usually darkcolored igneous rock. The effects of aggregate type, size, and content on the behavior of normal and highstrength concrete, and the relationships between compressive strength, flexural strength, and fracture energy are discussed. The other material investigated was incinerator bottom ash iba. Classification of aggregates as per size and shape coarse.
Aggregates aggregates generally occupy 65 80% of a concretes volume. The selection of the coarse aggregate type in concrete is a dominant. These crushed dark stone particles are not produced in qatar and they are barged mainly from the united arab emirates and the. If you need to print pages from this book, we recommend downloading it as a pdf. The crushed stone or crushed gravel aggregate make the asphalt or concrete mix somewhat difficult to place. The used gabbro in study is obtained from waste black granite as its locally named. Trbs national cooperative highway research program nchrp report 673. Pdf mechanical properties of gabbro aggregate concrete. Click here to see a super closeup that shows striations on one of these cleavage surfaces. The coarse aggregate particles are usually crushed stone or crushed gravel, and the fine aggregate particles are usually natural sand. Black minerals are primarily amphibole like hornblende and plagioclase feldspar. Strength properties of concrete by replacing coarse aggregate by. Aggregates occupy 70 to 80 % of total volume of concrete.
The term gravel coarse aggregate is used to define particles between 4. Four concrete mixes containing 100%, 75%, 50%, and 25% as partial replacement of gabbro aggregate with slag aggregate, by weight were designated as s20. The control was 100% imported gabbro coarse aggregate. Gabbro is a coarsegrained and usually darkcolored igneous rock. Introduction nowadays, as the field of civil engineering have become so innovative hence providing economic constructions and good strength. Abstract a lot of materials could be used as an admixture or even as an essential part of concrete, the aim of this study is to use the gabbro rocks as a fine and coarse aggregate in concrete. Gabbro aggregate is geologically an igneous rock, which is chemically equivalent to basalt. Use of local discarded materials in concrete sciencedirect.