Compressive Strength of Fiber Reinforced Fly- Ash Concrete using Regression Model

In construction industry, strength is a primary criterion in selecting a concrete for a particular application. Concrete used for construction gains strength over a long period of time after pouring the concrete. The characteristic strength of concrete is defined as the compressive strength of a sample that has been aged for 28 days. Neither waiting 28 days for such a test would not serve the rapidity of construction, nor would neglecting it serve the quality control process on concrete in large construction sites. Therefore, rapid and reliable prediction of the strength of concrete would be of great significance. On this backdrop, the method is proposed to establish a predictive relationship between properties and proportions of ingredients of concrete, compaction factor, weight of concrete cubes and strength of concrete whereby the strength of concrete can be predicted at early age. A mathematical model for the prediction of compressive strength of fiber reinforced concrete containing fly ash was performed using statistical analysis for the concrete data obtained from the experimental work done in this study. The multiple linear regression model yielded fairly good correlation coefficient for the prediction of compressive strength for 3 days curing

An Experimental Study into Behaviour of Circular Footing on Reinforced Soil

The experimental investigations are reported on the study of load-deformation behavior of a model circular footing on reinforced soil in respect of two-layered system comprising clay as sub-grade and mine waste as backfill material. The footing was subjected to axial load. Two different types of reinforcing materials such as Kolon Geo-grid (KGR-40) and rubber grids derived out of waste tyres were used in the study. The study revealed appreciable increase in ultimate bearing pressure and decrease in settlement with the provision of a single layer reinforcement. Further, rubber grid performed better than the Geo-grid in respect to BCR and SRF. The study indicates significance of solid waste materials such as mine wastes and discarded tyres as effective civil engineering construction materials

Phenotypic Characteristics of Shahi Strain of Nagpuri Buffaloes in Chandrapur District of Maharashtra, India

Phenotypic Characterization of Shahi Strain of Nagpuri Buffaloes was done in the Chandrapur District of Maharashtra, India. Two hundred and forty Shahi strain of Nagpuri female buffaloes of various age groups were observed in their home tract (n farms=24). It was found that black coat colour, black coloured muzzle, white patches on the legs, whitish eyes, white coloured tail switch, horizontal ear orientation, sword-shaped horns with pointed tip first turning backwards and then upwards, bowl-shaped udder are typical characteristics of this breed. The average live body weight, body length, chest girth, height at withers, head length, breadth of head of these buffaloes is (means ± standard deviation) 433 ± 8.4 kg, 137.08 ± 2.78 cm 180.81 ± 3.84 cm, 129.43 ± 2.26 cm, 54.18 ± 1.10 cm, 28.18 ± 0.34 cm in 3 years and above age group, respectively. The average daily milk yield and milk yield per lactation of Shahi strain of Nagpuri buffaloes were observed to be 4.06 ± 0.08 kg and 1,220.84 ± 41.57 kg, respectively

SOIL-STRUCTURE INTERACTION ANALYSES OF PILE SUPPORTED BUILDING FRAME

The effect of the soil-structure interaction on the simple single storeyed and two bayed space frame resting on pile group of two piles with flexible cap is examined in this paper by resorting to more rational approach and realistic assumptions. Initially, 3-D FEA is carried out independently for the frame on the premised of fixed column bases. Later, pile foundation is worked out separately. The stiffness so obtained for foundation is used in the interactive analysis of frame to quantify the effect of soil- structure interaction on the response of the superstructure. For modeling the foundation system two approaches of finite element analysis are used. In the first approach complete three dimensional finite element analysis is resorted to wherein pile, pile cap along with the soil are discretized into 20 noded isoparametric continnum elements and interface between pile and soil is idealized as  6 noded isoparametric interface elements. In the second approach simplified finite element analysis procedure is used wherein beam element, plate element and spring elements are used to model pile, pile cap and soil respectively.  The salient feature of the investigation is that the interaction between pile cap and soil underlying it is considered. In the parametric study presented here, effect of pile spacing and pile configuration is evaluated on the response of superstructure in the form top displacement in frame and bending moment at top as well as bottom of the superstructure columns. Results obtained by either analysis are compared

COMPUTATION OF BEARING CAPACITY FACTOR Nq –TERZAGHI AND PRANDTL MECHANISM

The unique values of the bearing capacity factors, Nq are obtained in respect of failure mechanisms suggested by Terzaghi and Prandtl using limit equilibrium approach. In this paper an attempt has been made to present the analysis integrating the Kotter’s equation with Terzaghi’s and Prandtl’s mechanisms using limit equilibrium conditions. The analysis presented here with some modifications in the exiting analyses computes the bearing capacity factor – Nq , the expressions of which are similar to the one given by Terzaghi [10] and Reissner [7] who had extended the pioneering work initiated by Prandtl [6]. The analysis reported here successfully demonstrates the applicability of Kotter’s equation to the solution of limit equilibrium problems involving plane or curved failure surfaces