Ultrasonic Pulse Velocity (USPV) test has gained considerable popularity all over the world.Ultrasonic pulse velocity testing of concrete is based on the pulse velocity method to provide information on the uniformity of concrete, cavities, cracks and defects. The pulse velocity in a material depends on its density and its elastic properties which in turn are related to the quality and the compressive strength of the concrete. It is therefore possible to obtain information about the properties of components by sonic investigations. The investigation reported here is to present study of calibration graphs for Non Destructive Testing (NDT) Equipment, which is ultra sonic pulse velocity test and to study the quality of the concrete in existing structures. These ultra sonic pulse velocity tests were then used to test the quality of the concrete of the various structural elements (columns and beams) of single storied newly under constructed office building. The use of this method produces results that lie close to the true values when compared with other methods. A correlation between ultra sonic pulse velocity test and strength of concrete structure is established, which can be used for strength estimation of concrete structures. The method can be extended to test existing structures by taking direct measurements on concrete elements.
In this study conventional concrete of M40 grade developed with diverse water binder ratio and fixed optimum dosage of 30% mineral admixture fly ash and GGBS with weight of cement .Compression test has been conducted on cube samples and Rapid Chloride permeability test (RCPT) are conducted on cylindrical specimens to acknowledge durability parameter. Compression test results has been enhanced with replacement of supplementary cementitious materials and chloride ion permeability has been reduced with substitution of fly ash and GGBS .incremental of water binder ratio also reduce the permeability value however compression value increased
The use of recycle materials as concrete ingredients has gained popularity because of increasingly stringent environmental legislation. This research paper check the possibility of replacement of sand (Fine aggregate) by marble powder recovered from marble slurry waste of marble processing units from 0% to 20 %, in production of concrete. This Research paper explore the mathematical modeling of compression strength of concrete cube specimens cured at 7 & 28 days, Split Tensile Strength at 28 days and Chloride penetration resistance of cylindrical concrete specimens cured at 28 days incorporating Marble Powder. Experimental investigation done on various concrete specimens to acknowledge compressive, split tensile strength and chloride penetration. Ordinary Portland cement (OPC) has been substituted with 0%, 10%, 15% and 20% by Marble Powder than after Concrete Cubes & cylindrical specimens prepared accordingly. Compressive strength test, Split Tensile Strength Test has been done concrete specimens and Rapid chloride permeability test (RCPT) has been done on cylindrical specimens. Three predictive regression models has been developed, one for compression strength (CS) of concrete cubes at 7, 28 days and second one for split tensile strength (STS) of concrete samples at 28 days age and last model for RCPT value i.e. charge passed Q@28days in cylindrical concrete specimens. Chloride penetration predictive Model Q @ 28 Days has value of 0.93, 0.69, 200.11 and 0.022 for R Square, Adjusted R Square, Standard Error, and P value. All predictive math models has been confirmed by data in complete range and has superior precision, correlation with experimental data and results.
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