IN CIVIL ENGINEERING

WHAT IS NANO TECHNOLOGY….. ??? & WHAT IS ITS IMPACT IN CIVIL ENGINEERING ……???

NANOTECHNOLOGY IS THE USE OF VERY SMALL PARTICALS OF MATERIALS EITHER BY THEMSELVES OR BY THEIR MANIPULATION TO CREATE THE NEW LARGE SCALE MATERILAS.

NANOMETER IS A BILLIONTH OF A METER .

DECISIVE MATERIALS PROPERTIES CAN BE DELIBERATELY IMPROVED BY INTRODUCING CHARATERISTICS STRUCTURES ON THE NANO SCALE

THE CONSTRUCTION BUSINESS WILL INEVITABLY BE A BENIFICARY OF THIS NANOTECHNOLOGY :INFACT IT’S ALREADY IN THE FIELDS OF …….

CONCRETEGLASSSTEELCOATINGS

NANOTECHNOLOGY & CONCRETE

AT THE BASIC SCIENCE LEVEL,MUCH ANALYSIS OF CONCRETE IS BEING DONE AT THE NANO-LEVEL IN ORDER TO UNDERSTAND ITS STRUCTURE USING THE VARIOUS TECHNIQUES DEVELOPED FOR STUDY AT THAT SCALE.

CONCRETE IS AFTER ALL ,MACRO-MATERIAL STRONGLY INFLUENCED BY ITS NANO-PROPERTIES AND UNDERSTANDING IT AT THIS NEW LEVEL IS YIELDING NEW AVENUE’S FOR IMPROVEMENT OF STRENGTH,DURABLITY & MONITERING .

NANOTECHNOLOGY IN CONCRETE

IN CONCRETE NANO PARTICLES MAINLY USED ARE:---

NANO SILICA.TITANIUM DIOXIDE.CARBON-NANOTUBE.

NANO SILICA ADDITION TO

CEMENT BASE MATERIALS

CAN CONTROL THE

DEGRADATION OF THE

FUNDEMENTAL C-S-

H(CALICIUM-SILICATE-

HYBRATE)REACTION OF

CONCRETE CAUSE BY

CALICIUM LEACHING IN WATER

AS WELL AS BLOCK WATER

PENETRATION AND

THEREFORE LEADS TO

IMPROVEMENTS IN DURABLITY.

WHEN RELEATED TO OPC AS

A RESULT THE COMPRESSIVE

STRENGTH OF THE MATERIAL

IS 3-6 TIMES HIGHER.

NANO SILICA

IT IS ANOTHER NANO PARTICAL

THAT IMPROVES CONCRETE

DURABLITY,STRENGTH &

IMPORTANTLY FOR SUSTANABLITY

AND REPLACING

CEMENT,HOWEVER ,THE CURING

PROCESS OF CONCRETE IS SLOWED

BY ADDITION OF FLYASH, AT EARLY

STAGE STRENGTH IS ALSO LOW IN

COMPARISION TO NORMAL

CONCRETE .

WITH THE ADDITION OF SIO2 NANO

PARTICALS ADDED TO CONCRETE

HAS SHOWN THAT THEY ALSO

INCRESE STRENGTH THAT REPLACES

DENCITY IN EARLYER STAGES.

FLY ASH

ANOTHER TYPE OF NANO PARTICLE ADDED TO CONCRETE TO IMPROVE ITS PROPERTIES IS TI02

TIO2 IS A WHITE PIGMENT AND CAN BE USED AS AN EXCELLENT REFLECIVE COATING .

TIO2 BREAKS DOWN ORGANIC POLLUTANTS ,VOLATILE ORGANIC COMPONDS ,BACTERIAL MEMBRANE’S THROUGH POWERFUL CATALYTIC RECTIONS.

ADDITIONALLY IT IS HYDRO PHILIC AND THEREFORE GIVES SELF CLEANING PROPERTIES TO SURFACE TO WHICH IT IS A PLANE.

TITANIUM-DIOXIDE

IN ADDITION OF SMALL

AMMOUNTS (1% WT) OF

CNT’S CAN IMPROVE

MECHANICAL PROPERTIES

OF SAMPLE MAIN PORTLAND

CEMENT PHASE AND WATER

(MWNT’S) SHOWS BEST

IMPROVEMENTS BOTH IN

COMPRESSIVE STRENGTH

(+25N/MM2) AND FLEXURAL

STRENGTH (+8N/MM2)

COMPARED TO THE

REFERENCE SAMPLE

WITHOUT REENFORCEMENT .

CARBON NANOTUBE(CNT’S)

NANOTECHNOLOGY AND GLASS

TIO2 IS USED IN NANO PARTICAL

FORM TO COAT GLASSING SINCE

IT HAS STERILIZING AND ANTI-

FOULING PROPERTIES .

FIRE PROTECTIVE GLASS IS

ANOTHER APPLICATION OF

NANOTECHNOLOGY IN WHICH

CLEAR IN TUMESCENT LAYER

SANWICHED BETWEEN GLASS

PANEL ‘S (AN INTER LAYER )

FORMED OF FUMED SILICA

NANO PARTICLES WHICH

INTURNS INTO A REGID A

OPAQUE FIRE SHEILD WHEN

HEATED .

NANO IN GLASS

WATER REPELLENT PROCESS

NANOTECHNOLOGY IN STEEL

STEEL HAS BEEN WIDELY AVAILABLE SINCE THE SECOND INDUSTRIAL REVOLUTOIN IN LATE PART OF 19TH AND EARLY PART OF THE 20TH CENTUARY HAS PLAYED A MAIJOR PART IN THE CONSTRUCTIN SINCE THAT TIME .

IT MAINLY DEALS WITH …….. FATIGUE

CABLES JOINTS WELLS

NANO IN STEEL

IT IS A SIGNIFICANT ISSUE THAT CAN LEAD TO THE STRUCTURAL FAILURE OF STEEL SUBJECT TO CYCLIC LOADING .

STRESS RISERS ARE RESPONSIBLE FOR INICIATING CRACKS FROM WHICH FATIGUE FAILURE RESULTS THAT THA ADDITION OF COPPER NANO PARTICALS REDUCES THE SURFACE UNEVENNESS OF STEEL WHICH THEN LIMITS TO THE NUMBER OF STRESS RISES HENCE FATIGUE CRACKING

FATIGUE

CABLE:THE REFINEMENT OF THE PHASE OF STEEL TO ANANO SIZE HAS PRODUCED STRONGER CABLES HIGH STRENGH STEEL CABLES BEING USED IN CAR TYRES ARE USED IN BRIDGE CONSTRUCTION AND PRE CASTING CONCRETE.

JOINTS:HIGH –RISE STRUCTURE REQUIRE HIGH STRENGTH JOINTS THIS INTURN LEADS TO NEED FOR HIGH STRENGH BOLTS WHICH ARE GENERALLY GONE THROUGH QUENCHING AND TEMPERING MARTENSITE.

CABLES,JOINTS &WELDS

WHEN THIS EXCEED 1200MPA EVEN A VERY SMALL AMOUNT OF HYDROGEN EMBRITTLES THE GRAIN BOUNDRAIES AND MAY FAIL DURING USE WHEN NANO PARTICLES LIKE VANARIUM AND MOLYBDENUM NANO PARTICLE SHOWN DELAY FRACTURE PROBLEMS.

WELDS:AND HEAT EFFECTED ZONES ADJUCENT TO WELLS CAN BE BRITTLE AND FAIL WITHOUT WARNING WHEN SUBJECTED TO SUDDEN DYNAMIC LOAD WHEN ADDITION OF NANO PARTICLES OF MAGNICIUM AND CALICIUM MAKES (HAZ)GREEN FINER IN PLATES STEEL.THAT INCREASE WELD THOUGHNESS.

SANDVIK NANOFLEX MMFX2

NANOTECHNOLOGY IN

COATINGS

NANO TECHNOLOGY IS BEING APPLIED TO PAINTS AND INSULATING PROPERTIES,PRODUCED BY THE ADDITION OF NANO-SIZE CELLS ,PORES AND PARTICLES ,GIVING VERY LIMITED PATH FOR TURMAL CONDUCTION ARE CURRENTLY AVAILABLE.

THIS TYPE OF PAINT IS USED AT PRESENT FOR CORROSION PROTECTION UNDER INSOLATION SINCE IT IS HYDROFOBIC AND REPLES WATER.

TIO2 AS KNOWN …….

NANO IN COATING

NANOTECHNOLOGY

AND

FIRE PROTECTION

NANOTECHNOLOGY & FIRE PROTECTION

NANO CEMENT HAS THE POTENTIAL

TO CREATE A NEW PARADIGM IN THIS

AREA CAN BE USED AS

TOUGH,DURABLE HIGH TEMPARATURE

COATING THIS IS ACHIVED BY MIXING

CNT’S WHICH CEMENT MATERIAL TO

FABRICATE FIBER COMPOSITES WHICH

RESULTS OUTSTANDING

PERFORMANCES .

POLY PROPOLINE ALSO ARE BEING

CONSIDER AS THE METAL OF

INCREASING FIRE RESISTANCE AND

THIS IS CHEAPER OPTION THAN

CONVENTIONAL

“ NANOTECHNOLOGY IN CIVIL ENGINEERING IS DEFINITELY THE PRESENT AND THE FUTURE”

SURINDER MANN :- “NANOTECHNOLOGY & CONSTRUCTION –NANO FORUM REPORT”.

NANO CEMENT ,STEEL AND CONSTRUCTION INDUSTRIES CONFERENCE:-

WWW.NANOCON.SABRYCORP.COM

BY M. PARIKSHIT B.SAMEER CHARAN

“REFERENCES”