Materials: The locally available raw jute yarn of 10 lb/spyndle with 5 TPI (Twist per inch) was used without any treatment. This jute yarn with four different cut lengths (10, 15, 20 and 25 mm) also were applied with various volumetric percentage on concrete mixture. Ordinary Portland cement were applied as binding materials, normal consistency of which was 30 %, initial setting time was 132 min and the final setting time was 7.00 h. Sand (fineness modulus = 2.5) and 25 mm down well graded crushed bricks were used as coarse aggregate. Concrete mix: Mix design is the selection of mix ingredients and their proportions required in a concrete mix. The mix design involves that amount of cement, fine aggregate, and coarse aggregate be available and the relation between water/cement ratio and target strength must be known. Since, the objective of the study was to investigate the effect of incorporating jute yarn on the mechanical properties of concrete, the mix design with target strength was not accomplished in the study. Rather, the commonly practised mix ratio used in Bangladesh and other neighbouring countries like parts of India and Pakistan was used. To this end, in the present study, two different mix ratios, cement: sand: brick chips (by volume) = 1:2:4 and 1:1.5:3 and water/cement ratio (by weight) 0.60 and 0.55 were cautiously maintained. In concrete mix preparation, initially different jute yarn cut length and volumetric content were applied in the concrete mix and observed the mixing performance to obtain better arrangement of jute. And finally jute yarn of 10, 15, 20 and 25 mm lengths with 0, 0.1, 0.25, 0.50 and 0.75% volume dosing were selected; and lastly samples were prepared for a particular set of parameters. Preparation of the test specimen: The different parameters of the concrete composites, the length and volume fraction of the jute yarn content were used. The different lengths of yarn 10, 15, 20 and 25 mm and the contents 0, 0.1, 0.25, 0.50 and 0.75% were used. Three different specimens; cubes (150 mm × 150 mm × 150 mm), prisms (450 mm × 150 mm × 150 mm) and cylinders (150 mm × 300 mm) were cast to determine the compressive, flexural and tensile strength of the composites, respectively. The yarns were cut to the mentioned length manually by a hand scissor. The mixing of the ingredients were done by a pan mixer accordingly jute yarns were added slowly and evenly to the concrete mix, so that, a uniform distribution of yarns throughout of the concrete could be confirmed. Cement was added into the mixer and mixing was conducted followed by the addition of water, until uniformity was achieved. This way of concrete mixing was continued for about 3 min. Then the freshly mixed concrete was poured in the moulds of cube, prism and cylinder. After that the specimens were left 24 h for de-moulding. They were then cured in water for at least 28 days. At the end of curing period the specimens were allowed to be dried in air for 24 h before testing. Experimental program: The present study consists of determining the flexural, compressive and tensile strength of concrete composites with jute yarn and was compared to that of plain concrete. A Universal Testing Machine (Model-UTN-100, India, Capacity-980 KN.) for tensile test and an Automatic Compression Testing Machine (MATEST s.r.l, Italy, capacity 3000 KN) for compressive test and an Automatic Flexural Strength Testing Machine (MATEST s.r.l, Italy, Capacity 150 KN.) for flexural test were used. In addition, the microscopic views of tested specimens were also analysed. Compressive strength testing: Compressive strength of a concrete is a measure of its ability to resist static load, when the later one tends to crush it. Testing of compressive strength is the most common, many desirable characteristics of concrete are related to its strength, and hence the compressive strength of concrete in structural design is of utmost importance. Additionally, the compressive strength gives a good and clear indication that how the strength affected with the increase of fibre volume dosage rate in the test specimens. In AS 1012, it is mentioned that the specimens for compressive strength should be 150 mm diameter and 300 mm height, but this only applies to the maximum aggregate size more than 20 mm while the cube specimen with 150 mm in each side (AS 1012 2002), and the intensity of load is determined in MPa. qualitatively. The compression test procedure was carried out according to test method AS 1012.9.