The paper presents the statistical analysis on the compressive strength of concrete with strength ranging from 30 MPa to 130 MPa. To obtain these concrete strengths, concrete mixes with virgin aggregates were prepared with four different wate r to cementitious content (w/c) ratios i.e., 0.45, 0.36, 0.24, and 0.18. With w/c ratio of 0.45, a mix is also designed using recycled construction and demolition coarse aggregate to compare statistical characteristics with respect to concrete made using virgin aggregates. The presented statistical analysis includes measure of central tendency, dispersion of the data, distribution shape properties, and precision of the mean. A normal and a log-normal distribution has been established and validated for the experimental data set of all the mixes. A correlation has also been established for the compressive strength of 100mm cube and 150mm cube. Analysis shows an increase in dispersion of data with increase in the mean compressive strength of the mix. The mix with Construction and demolition waste aggregate shows a higher standard deviation than the mix with virgin aggregates at the same w/c ratio. The correlation curve for the compressive strength of 100 mm and 150 mm size cubes, shows a conversion factor of 1.04, suggesting an insignificant difference of the compressive strength values of 100 mm and 150 mm cubes for the mix studied.
A study was conducted to work out the effects of leguminous crops with Mulberry in Doon valley under irrigated conditions. The work was conducted for three consecutive years (2001-2003) in S-146 variety of Mulberry plantation. The leguminous crops (Moong and Lentil) were sown in the space available in between the Mulberry rows. The data on returns from intercrops and silk worm rearing on the leaves were collected and compiled. It revealed that from one hectare Mulberry plantation with intercropping Rs. 77251.34 can be earned. However, the total returns from one hectare plantation without intercropping and from sole intercropping were recorded as Rs. 48933.00 and Rs. 49533.00 respectively. The varieties of Moong and Lentil sown were Pant. Moong-2 and D.P.L. -62 respectively. By this study it can be concluded that it is profitable to grow short duration leguminous crops in the space available in between the rows of Mulberry fetching thereby an additional income. The experimental plot was having slightly acidic soil (pH 6.8). The available N, P, K in upper layers were recorded as 440 kg, 38 kg, and 448 kg/ha respectively.
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