International Journal of Civil, Structural and Concrete Engineering

Authors:-Md. Tasbirul Islam, Md. Reazul Mumin, Sariah Ismail, Shafiqul Islam, Sristi Das Gupta

Abstract:-Since the beginning of modern age, building a structure on a soft soil has always been a challenge for engineers. Apart from gravity loads, effect lateral load like earthquake load can vary due to soil type. The problem of soil-structure interaction in the seismic analysis and design of structures has become increasingly important, as it may be inevitable to build structures at locations with less favorable geotechnical conditions in seismically active regions. The study was carried out to assess the effect of soil stiffness and conditions on RC frame displacement based on BNBC 2006 and proposed BNBC 2015. The variation in structural displacement due to different cases is investigated in this research. The structural displacements based on BNBC 2015 are always greater than that of BNBC 2006 for all proposed cases, considering similar soil condition. For all soil conditions, maximum increment in deflection generated for case 5 while the lowest increment found for case 2, as the analyses were static linear consideration, the earthquake load greatly influenced by the seismic zone coefficients. As the second highest deflection occurred in case 2 with the least increment, the structural cost in case 2 areas would be comparatively high considering the other areas but the structures will be least critical for new code consideration when the other parameters are same.

Authors: Mahesh S M, Vanishree B

Abstract: When vertical piles are installed beneath buoyant structures such as dry docks, basements, and pumping stations they are required to resist uplift loads. Although the loads applied on piles are usually a combination of both vertical and lateral loads, very limited experimental research has been done on the response of pile groups subjected to combined loads. Due to pile–soil–pile interaction in pile groups, the response of a pile group may differ substantially from that of a single pile. This difference depends on soil state and pile spacing. This paper presents results of experiments designed to investigate pile interaction effects on the response of pile groups subjected to both axial and lateral loads. The combined load test results showed that the resistance, lateral displacement and efficiency at the head of the piles increased substantially for tests performed in the presence of axial loads, suggesting that the presence of axial loads on individual and groups of piles driven in loose sand is detrimental to their lateral capacity.

Authors: Anuja Narayanan

Abstract: Soil Stabilization is the process of altering some soil properties by different methods, mechanical or chemical in order to produce an improved soil material which has all the desired engineering properties. Soils are generally stabilized to increase their strength and durability or to prevent erosion and dust formation in soils. So it is very important to stabilize the expansive soil. In our project stabilization of expansive soil is done using quarry dust and lime mixes. The combined effect of these two materials are expected to show better results on compaction characteristics, unconfined compressive strength, California bearing ratio (CBR) when it is used along with expansive soil. As quarry dust and lime are the cheapest and easily available material it mixes will increase the characteristics of soil. Here we have planned to conduct several testing methods such as specific gravity, sieve analysis, atterberg limits, UCC, proctor compaction in order to improve the strength of soil at different proportions of lime and quarry dust mixes. Then the results and graphs of various mixes are compared to see their effects in soil stabilization.

Authors:-Tejas D. Doshi, Abhijit Bhatkal, M. B. Patil

Abstract:-The main aim of this study is to observe the behavior of E-coli bacteria on durability properties of concrete, also know the effect of replacement of natural sand by M-Sand(40% replacement), with different cell concentration( 0,105,107 cells/ml) of E-coli bacteria were used for concrete mixes. The test was carried out on the durability properties after complete curing of 28 days. The test results shows inclusion of E-coli bacteria in concrete has an ability to enhance durability by reducing water absorption and sorptivity of concrete and also have great resistance ability to sulphate.

Authors: Supriya D. trimbake, Kaveri m. Vadage, Chetan b. Bhamare, Vinay n. naikwade, Roshan s. kapadnis

Abstract: Steatite is a talc-schist, subpart of metamorphic rock & compost 50% to 80% of talc & magnesium .It produced in a zone where tectonic plate broke the rock by heat & pressure but without melting .We can say dynamo thermal metamorphism and metasomatise phase. Steatite is used for inland designs sculpture, coasters &kitchen (making bowl, cooking slabs etc.) & sinks. Inuit use soapstone for traditional carvings. Soapstone is a soft stone used to create moulds for creating objects & slick surface of soapstone allows finishing object to be easily removed.

Author: Nikita Garg

Abstract: This paper reports the results of experiments evaluating the use of natural product as partial replacement for ordinary Portland cement in concrete. While concreting is done the main ingredients are coarse aggregate, fine aggregate, cement and water. Out of these cement has more demand and if we can replace it with another natural product which is economical, it may become a great success. We choose tapioca powder for partially replacing the cement in concrete. We founded an optimum percentage of 1.0 for partially replacing the cement by tapioca powder in concrete, through which we can achieve high strength while comparing with normal concrete. At the same time while using tapioca powder by partially replacing cement, it will increase the setting time of concrete when compared to ordinary Portland cement. OPC has an initial & final setting time of 30 minutes and 10 hours respectively. But when partially replacing cement by tapioca powder it has an initial and final setting time of 90 minutes and 24 hours respectively.