LIME Perspective by Vaishali Latkar (Compatibility Mode)
LIME Perspective by Vaishali Latkar (Compatibility Mode)
LIME Perspective by Vaishali Latkar (Compatibility Mode)
Ar. Vaishali Latkar For Hands on -Lime workshop organised by NIASA and coordinated by Ar. Vaishali Latkar from 6th Sept10 10th Sept.10
EVERYDAY
GLASS INDUSTRY
VERSATALITY OF LIME
CONSTRUCTION INDUSTRY AGRICULTURE WATER TREATMENT SLUDGE TREATMENT MEDICAL SECTOR SOIL STABILIZATION
LIME AS A MATERIAL CALCITE Calcium Carbonate CaCo 3 + heat Cao+Co 2 Lime is an extremely caustic material when wet, with a pH of 12. The high pH provided by lime will kill unwanted bacteria. Lime will react with many soluble substances to form insoluble substances. limestone Heat generated in the formation of quick lime can be used for drying, setting or killing organism
into hydraulic by addition of material that will react with burnt lime and produce the silicate products with bnding ability leading to early strength)
Non-hydraulic lime can only set through carbonation (re-absorption of CO2). Hydraulic lime sets under water
Polymers Active clay responsible for strength In India, fine brick dust (below 50 microns) called surkhi had been the pozzolonic addition to lime
AS REINFORCEMENT SOFT FINISHING Jute fibres Curd Horse hair straw BETTER BONDING Eggs Raw sugar
WHY SHOULD WE USE LIME SUSTAINABILITY Totally recyclable BREATHABALITY Due to porosity ENERGY EFFICIENCY Consumes less energy in making LOW THERMAL CONDUCTIVITY Keeps interiors cool in warmer climates and warm in cooler climates WATER PROOFING Lime mortars permeable, allow for evaporation of moisture A NATURAL ANTISEPTIC Due to high pH, reduces air pollutants STRUCTURAL OR SEASONAL MOVEMENTS Allow for movement without significant damage SELF HEALING Finer cracks allow water penetration, dissolve free lime and bring it to the surface, after evaporation cracks are filled DURABILITY Many historic monuments are the proofs. PASSIVE FIRE PROTECTION Releases water vapour when exposed to fire acting as fire retarder
When used as binder in the mortar, classification as per Vicat( 1828), Non hydraulic or rich lime- ( fat lime)10%foreign material, 90% lime Hydraulic lime 10-30% clay, 40-60 % lime Cement 40-60%clay and 60-40% lime Pozzolonic cement 70-90% clay 3010% lime
Lime washes It is dispersion of calcium hydroxide particles in an aqueous solution of approx. 1g/l Ca(OH). Lime putty stored for a long time with a water content of 52% by mass can be used as lime wash Lime plaster With numerous additives and admixtures Lime Mortar By mixing and grinding lime, sand and pozzolonic materials, additives and water Lime Concrete Mixture of sand, larger aggregates with hydraulic limes, pozzolanic materials, additives and water
PROBLEMS ASSOCIATED WITH LIME Leaching Atmospheric pollution Crystalisation of soluble salts Volume Changes Biological Causes
TECHNIQUES OF ANALYSIS Petrographic study Non Invasive Techniques Light Microscopy Wet Chemical Analysis Scanning Electron Microscopy X-ray diffraction Physical Testing Mechanical Testing Dating technology
LIME IN HISTORIC ARCHITECTURE A WORLD PERSPECTIVE CAVEMAN The Lascaux caves in France are frescoed of natural iron oxide pigments applied onto damp cave walls of high calcium content (Lime stone), dating back as far as 16,000 years. These paintings are often considered to be among the first true frescoes made by man. EGYPTIAN The Egyptians, about 6,000 years ago, they used lime to plaster the pyramids at Giza. In addition, incorporated various limes into their religious temples as well as their homes. Lime plaster + stucco Lime gypsum (CaSO4, 2 H2O), plaster Decorative fine plaster workat tel-el amarna 1 thk lime stucco finished with 1/8 thick lime
GREEK AND ROMAN Mycenae temples at homers time show lime stucco for marble surfaces Lime used in stucco Lime mortars unknown till Romans Pliny the younger stated no builder should employ lime which had not been slaked atleast three years Vitruvius, in his ten books on Architecture (40 B.C.), devoted a total chapter on lime Talks about the choice and the use of lime, sand, puzzolona and other materials on mortar. Gives details for the application of fine six coat marble dust and lime stucco on reed laths for internal decoration
Classical Roman Period Public structures stone and hydraulic lime mortar with additions of pozzolanic sands. Aqueducts were watrerproofed using hydraulic mortars. Dark period Loss of technical know how Buildings with soft lime mortar Use of mud for plastering purposes Lime was finally re-introduced when the Normans arrived and used lime for the construction of a number of religious buildings.
CHRISTIAN - UPTO RENAISSANCE In southeast England in the 14th century, artisans, using trowels, applied decorative lime plaster to the exterior of timber-framed structures. Throughout, lime was widely used for molded and ornamental plaster work. During the Renaissance, lime made an explosive revival in the plastering and painting arts. In the mid-15th century, artisans from Venice created a new type of external facing called Marmorino, made by applying lime directly onto terra cotta brick and lime-mortar bases. Also known as Venetian Lime Plaster
TEMPERAS AND FRESCOES FRESCO Buon fresco (Italian for true fresco) is painting technique in which water colours are applied to lime plaster when it is still wet, Because of the chemical makeup of the plaster, a binder is not required, as the pigment mixed solely with the water will sink into the intonaco( plaster coat), which itself becomes the medium holding the pigment. The pigment is absorbed by the plaster; after a number of hours, plaster dries and reacts with the air: this chemical reaction which fixes pigment particles in the plaster wet the it is the Sistine chapel ceiling by Michelangelo Renaissance paintings Aided by climate Colours comparatively dull
TEMPERAS Secco Fresco technique in which water colours are applied to dry plaster that has been moistened to simulate fresh plaster The pigments thus require a binding medium, such as egg tempera, glue or oil to attach the pigment to the wall. less durable Examples Indian wall paintings Last Supper by Leonardo Da Vinchi
19th century 1824 cement by Aspadin Colonial architecture developed all over the world Use of lime in combination with cement
Stucco works
SACRED TEXT DESCRIBING LIME IN ART AND ARCHITECTURE Vishnudharmottar purana 4-5th A.D. by Kshemraj Shrikrishnaraj Lime in plaster Samarangana Sutradhar 10th Cent. A.D. by King Bhoja Lime in plaster Abhilashitartha Chintamani 12th Cent. A.D. by King Someshwara Lime plaster Shilparatna 16th Cent. A.D. by shrikumara Lime plaster
References of lime use in Harappan civilization found in the form of lime mortar with mud bricks
VAJRALEP Mythological books talk of vajralep - Special plasters by mixing organics in the mud, mud-lime mixture together with sand, small crushed pieces of burnt clay. Strengthened by using the fibres from coconut, cotton, stems of cereals
vajralep
INDIAN ART
Ajanta paintings
TEXTURE Compact limestone, Earthy limestone, conglomeratic limestone, modular limestone, crystalline lime stone, unconsolidated limestone
Consumption
Cement Industry 75% Iron and Steel Industry 16% Chemical Industry 4% Others 5%
PRODUCTION OF LIMESTONE IN INDIA 75% Of total limestone produced by six states of Madhya Pradesh, Rajasthan, Andhra Pradesh, Gujrat, Chattisgarh and Tamil nadu M.p. All states produce small quantities of limestones Year 1951 1961 147.55 1971 150.79 1981 324.41 1991 683.76 2001 1273.38 2003 1455.52
7.4
24.6
88.4
308.4
1347.4
1524.9
Lime from Katni, marble city of Madhya pradesh and Rajasthan most sought after for building woks. south side limestone of cement grade
TRADITIONAL PREPARATION OF LIME Should be on plain ground On higher level in the site Dia 3.1 m ext. 2.4 int. Channel width -70 cm Consolidation required Grounding wheel dia - 75 cm Of quartz or slate Wooden member dia 15 cm Pivoted by metal clamp. Traditional Chakki Manually in pit of appropriate size depending on quantum Idli grinder can be used for smaller quantities
COMPARISION TO CEMENT
LIME Permeable Flexible Soft Weatherproof and not waterproof Do not attract water Deal with moisture effectively Reduces green house effect CEMENT Not permeable Rigid Hard Waterproof Attract water Condensation problem Causes green house gas effect
NEW PRODUCTS
Limecrete Limecrete is a mixture of natural hydraulic lime (NHL) and aggregate that can be used to create breathable floors. It offers increased vapour permeability and is often used in combination with breathable membranes. Sand Lime/ Calcium Silicate Bricks
Waterproofing in roof with lime concrete terracing Tamping machine for tamping lime concrete on roof Improved design for brick kiln and lime kiln
RESERAC
CENTRAL ROAD RESEARCH INSTITUTE, DELHI Lime/ clay burnt pozzolona NEYVELI LIGNITE CORPORATION, NEYVELI Fly ash lime gypsum brick for masonry
WORLD SCENARIO Already assumed a proportion of movement http://www.sustainablebuild.co.uk/ http://www.eula.be/- European lime organisation http://www.internationallime.org/ http://www.lime.org/- US and Canadian organization hwww.britishlime.org/ http://www.biolime.com/ Standards for lime working in place for America African Countries Europe India Austrelia Japan China