masonry third lecture

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Materials in Masonry Construction Third Lecture Masonry Construction March 2013

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masonry third lecture

Transcript of masonry third lecture

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Materials in Masonry

Construction

Third Lecture

Masonry Construction

March 2013

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1

Decreto Ministeriale 14 gennaio 2008:

Norme Tecniche per le Costruzioni – NTC2008

Circolare 617-09:

Istruzioni per l’applicazione delle

“Norme tecniche per le costruzioni”

di cui al D.M. 14 gennaio 2008

EN 1996 - Eurocodice 6 EN 1996

Reference codes:

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Capitolo 4 – Costruzioni civili e industriali

Sezione 4.5 – Costruzioni di muratura

Capitolo 7 – Progettazione per azioni sismiche

Sezione 7.8 – Costruzioni di muratura

Capitolo 8 – Costruzioni esistenti

Sezione 8.7– Valutazione e progettazione in presenza di azioni sismiche

Paragrafo 8.7.1 Costruzioni in muratura

Capitolo 11 – Materiali e prodotti per uso strutturale

Sezione 11.10 – Muratura portante

Parti delle NTC 2008 relativi alle costruzioni in muratura:

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Masonry is the assemblage of units properly bonded with mortar .

What is masonry?

Basic Components of Masonry:

� units

� mortar

� grout

� accessory materials

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Types of Bricks

The quality and characteristics of masonry products are directly and exclusively

determined by the raw materials and methods of manufacture used in their

production. A basic introduction to this aspect of masonry will aid in understanding

the finished products and how they may best be used in specific design applications.

� CONCRETE MASONRY

� Clay bricks

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Concrete Masonry

Discovery of Portland cement cause the development of modular concrete masonry.

The first production were heavy, unwieldy and poorly adaptable units but later

inventions in molding of cement ingredients into large blocks produce a bright new

material.

Concrete masonry today is made from a relatively dry mix of cementitious materials,

aggregates, water, and occasionally special admixtures.

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Concrete Masonry

Lecablocco is a small component of Leca concrete that is used different elemnts of

masonry construction. .

LECA stands for Lightweight Expanded Clay Aggregate. It is clay fired at a fairly high

temperature. Leca is an inert granular lightweight, insulating, resistant.

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Clay Bricks

Clay is the final product of the chemical alteration over long periods of time of the less

stable minerals in rock.

Clays are basically compounds of silica and alumina with varying amounts of metallic

oxides and other minor ingredients and impurities.

Clay is produced by suitable blend of clay and water.

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Design, workmanship and material are the important elements of proficiency in

masonry construction and also, quality and characteristics of raw material and

methods of production.

light color bricks (salmons) indicate low temperature in burning (under burning)

which cause high porosity and absorption but low strength and durability and

resistance to abrasion And dark color bricks (clinker) are the results of over

burning and they have high compressive strength and abrasion resistance and

resistance to freezing and thawing and reduction in absorption.

Clays may be calcareous or non- calcareous which both of them are hydrous

aluminum silicates. around 15% calcium carbonate in calcareous clays cause

yellow color brick during firing.

The oxide inside the non-calcareous clay, from 2to 25%, produce a buff to a pink o

red color brick.

Clay Bricks

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� Forming

� Drying

� Burning

� Drawing and Storage

Manufacturing of Clay bricks

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� solid

� solid with frog

� Perforated

� hollow

� cellular

Shapes of the bricks

Shapes of the Bricks

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Mortar is the medium which binds together the individual structural units to create

a continuous structural form e.g. brickwork, stonework etc. Mortar serves a number

of functions in masonry construction:

� distribute the pressures evenly throughout the individual units

� bind together the individual units

� infill the joints between the units and hence increase the resistance to moisture

penetration

Mortar

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Present day mortars are specifically manufactured to suit the type of construction

involved. In most cases they are mixtures of :

Mortar

� Sand

� Cement

� lime

� Water

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Properties of mortars