Cement Energy and Environment

Av~ago % vnrlatlon Avorago split % variation _ !lfi', of o;., of comp ou lvo with roapcct tonallo with respect S. No Oottlgnetlon C.A L.W.A Str •rJth 1o rotoronco Stronyth to rotoronco Remarks (N/ 1 m;) mix (Mpu) mix 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 LM1 LM2 LM3 LM4 LM5 LM6 LM7 LM8 LM9 LM10 LM11 LM12 LM13 LM14 LM15 LM16 LM17 LM18 LM19 LM20 LM21 LM22 LM23 LM24 LM25 LM26 LM27 LM28 LM29 100 100 0 0 100 0 75 25 75 25 75 25 50 50 50 50 50 50 25 25 25 0 0 75 75 75 100 100 0 100 100 0 100 0 100 0 75 25 75 75 50 50 50 25 25 25 0 0 0 25 25 50 50 50 75 75 75 100 100 100 38.73 40.34 44·.1 5 3~1.74 3i'.48 3~1.92 2Ei.95 28.32 2~1.66 16.7 18.85 22.65 1!i.15 1H.42 1!3.56 44.15 4!).48 49.6 3!U8 40.59 4'1.71 33.00 35.68 3'7.14 2:3.24 26. 17 27.5 16.48 22.43 23.28 0 +4.15 +13.99 -12.88 -3.22 +3.07 -30.42 -26.87 -23.415 -56.88 -51.32 -41.51 -60.88 -52.43 -49.49 +13.99 +17.37 +28.06 +1.2 +4.80 +7.69 -14.79 -7.875 -4.10 -39.9 -32.42 -28.89 -57.44 -42.08 -39.89 ~$' 3.4 4.57 4.89 3.34 3.95 4.42 3.1 3.57 4.35 ~ 2.18 3.13 2.45 1.56 1.75 2.05 6.15 6.74 7.69 4.51 5.72 6.42 4.3 4.9 4.93 2.85 3.3 3.57 2.15 2.74 2.90 0 +46.17 +43.82 -1.78 +16.17 +30 -8.82 +46.17 +27.9 -35.9 -7.95 -27.9 -54.17 -48.55 -10.29 +80.88 +93.2 +126.2 +32.6 68.2 +88.8 +26.4 +44.17 +45 -16.2 -7.9 +5 -36.76 +10 Reference mix Fig.1 : variation of concrete weight with percentage of light weight aggregate(1% fibre) Load Deflection Characteristics When certain percentages of steel fibres are added to the mix the specimens have under gone ductile failure. With or without admixture~; when the flexural load has reached certain level, crack has occurred and with increase in the load the crack has further spread and the final failure has occurred at the ultimate load. When the specimen is fully cracked it is observed that from the initial crack to the final failure the fa il ure mechanism was smooth and gradual. Specimens with fibres have not only contributed towards higher flexural loads 52 --