Lightweight concrete By KIRAN KUMAR 097K1A0118

CONTENTS 1.Introdution 2.Literature review of lightweight concrete 3.Methodology 4.Results 5Conclusion 6.Reference

1.INTRODUCTION A new development that has gained popularity during the last few years, has been the introduction of lightweight concrete as a material for roof decking and as an insulation system. This new application provides a variety of economic and environmental advantages: Lightweight insulated concrete provides consistency in compressive strength and density. Properly installed, LWIC roofs can achieve the proper slope without the necessity of tapered roof insulation systems. These roofs provide a thermal R-value of R-30. Since these roofs are an integral part of the building structure, when remedial care is needed, only the membrane must be removed – the concrete acts as the insulation. This means that removal costs are significantly reduced – and removal costs can comprise as much as 50 percent of any roof rehabilitation project. LWIC roofs reduce the dead load of a structure.

FIG 1 pantheon building

2.LIETRATURE REVIEW OF THE LIGHTWEIGHT CONCRETE

2.1 TYPES OF LIGHT WEIGHT CONCRETE LIGHT WEIGHT CONCRETE CAN BE CATEGORIZED INTO THREE GROUPS 1.NO –FINES CONCRETE 2.LIGHTWEIGHT AGGREGATE CONCRETE 3.AERATED/FOAMED CONCRETE

2.1.1 NO FINES CONCRETE No fines concrete is, as the name indicates, concrete consisting of coarse aggregate, cement and water- fines being omitted entirely. Some of the advantages are impressive. One of the main advantages of no fines concrete results from its relatively low hydrostatic pressure when wet. The hydrostatic pressure of no fines concrete is on average only about one third that of dense concrete

NO FINES CONCRETE EXAMPLES TecEco - Permecocrete Pervious ConcRETE CADMAN

LIGHTWEIGHT AGGREGATE CONCRETE the most common type of concrete, in which lightweight aggregate is used as the coarse filler, cement (more rarely, gypsum, lime, synthetic resins) is used as the binder, and open sand or compact sand (for example, quartz sand) is used as the fine aggregate. In terms of the degree of porosity of the concrete, lightweight aggregate concrete is classified as compact, large-pore (sand-free), or aerated. In terms of purpose, it is classified as thermally insulating, structurally insulating, or structural. \

ECAMPLES OF LWAC Jeff Girard: Is Lightweight Concrete STRUCTUREmag - Structural Enginee

2.1.3 AERATED CONCRETE A light-weight product consisting of portland cement, cement-silica, cement-pozzolan, lime-pozzolan, or lime-silica pastes, or pastes containing blends of these ingredients and having a homogeneous cell structure, produced by gas-forming chemicals or foaming agents.

EXAMPLE OF AERATED CONCRETE Autoclaved aerated concrete Autoclaved aerated concrete

ADVANTAGES OF LIGHTWEIGHT CONCRETE

DISADVANTAGES

2.3 APPLICATIONS OF LWC Concrete is the most widely used man-made construction material. It is obtained by mixing cement, water and aggregates (and sometimes admixtures) in required proportions. The mixture when placed in forms and. allowed to cure becomes hard like stone. The hardening is caused by chemical action between water and the cement and it continues for a long time, and consequently the concrete grows stronger with age. The hardened concrete may also be considered as an artificial stone in which the voids of larger particles (coarse aggregate) are filled by the smaller particles (fine aggregate) and the voids of fine aggregates are filled with cement. In a concrete mix the cement and water form a paste called cement water paste which in addition to filling the voids of fine aggregate acts as binder on hardening, thereby cementing the particles of the aggregates together in a compact mass.

APPLICATIONS OF LWC The strength, durability and other characteristics of concrete depend upon the properties of its ingredients, on the proportions of mix, the method of compaction and other controls during placing, compaction and curing. The popularity of the concrete is due to the fact that from the common ingredients, it is possible to tailor the properties of concrete to meet the demands of any particular situation. The advances in concrete technology have paved the way to make the best use of locally available materials by judicious mix proportioning and proper workmanship, so as to produce concrete satisfying performance requirements.

3.METHODOLY 3.1 TESTING PROGRAM OF LWC 3.2 COMPRESSIVE STRENTH METHODOLOGY IS FOLLOWING 4 STEPS 3.1 TESTING PROGRAM OF LWC 3.2 COMPRESSIVE STRENTH 3.3WATER ABSORPTION 3.4 DENSITY

3.1 TESTING PROGRAM OF LWC \ 3.1 TESTING PROGRA3.1 TESTING PROGRAM OF LWC M OF LWC \

3.2 COMPRESSIVE STRENTH

3.3WATER ABSORPTION

3.4 DENSITY

THIS PROPERTIES USING RESULTS ARE OBTAINED RESULTS DEPENDED UPON THE ABOVE METHODOLGY PROPERTIES 1.STRENGTH AND DENSITY COMPARISON 2.COMPRESSIVE STRENGTH 3.WATER ABSORPTION 4.SUPPLEMENTARY TEST THIS PROPERTIES USING RESULTS ARE OBTAINED

5.CONCLUSION Examples have shown where the use of lightweight aggregate in concrete has saved materials, labor and transportation cost, as well as improving the performance and service life of concrete. In addition, it has shown how using lightweight aggregate can lower the overall energy consumption of structures throughout their useful lives. These benefits all fit into the green building movement and help projects become LEED certified. The use of lightweight aggregate often lowers initial construction cost and most importantly, significantly lowers the life-cycle cost of the structure.

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