Study on effect of strength and durability parameters and performance of Self Compacting Concrete replacement with GGBS at different dosages

To investigate experimentally, the behavior of exterior beam-column joint and strength characteristics of Self Compacting Concrete (SCC) containing Viscosity Modifying Admixture (VMA), and Ground Granulated Blast Furnace Slag (GGBFS). Since there is no standard method of mix design is available for SCC. Hence mix design was arrived as per the rules of European Federation of National Associations Representing for Concrete (EFNARC). Marsh cone test was used to find the saturation of various kind of cements by adding the dosage of super plasticizer accordingly. In this investigation SCC was made by usual ingredients such as cement, fine aggregate, coarse aggregate, water and ground granulated blast furnace slag at various replacement levels (10%, 20%, 30%, 40%, and 50%), with that the Super Plasticizer (Glenium B233) and viscosity modifying agent (Glenium Stream 2) was used in appropriate amount for achieving the better flow in the concrete. The experiments were carried out by maintaining a constant water-powder ratio of 0.45. At various replacement levels the performance of freshly prepared SCC is checked by conducting tests such as slump flow, T50 slump flow, U-tube, L-box and V-funnel tests. Mechanical characteristics like Compressive, Split-tensile and Flexural strength examined. Also, the durability study for SCC after 28, 56 and 90 days curing was done by conducting a number of the tests like saturated water absorption, porosity, carbonation depth and alkalinity measurement


Introduction
Concrete is that the high wide utilized material in innovation development so significant thought is attempted for upgrading the properties of cement regarding quality, strength boundaries. Various sorts of cement are set up to build up the differed properties of cement. Up until now, this improvement are frequently managed out into four stages. The quickest is the antiquated customary quality solid that is contained just four principal materials that are concrete, water, fine and coarse totals. With a quick increment and a much bigger interest for lodging and foundation, supplemented by ongoing improvements in innovation, as multi celebrated structures and long range spans, bigger compressive quality cement was basic. When these mineral admixtures top off a piece of the pc, the estimation of SCC will be decreased prominently if the mineral admixtures are squander or mechanical result. Also, the utilization of mineral admixtures inside the production of SCC not exclusively conveys monetary points of interest anyway conjointly reduces warmth of hydration. The mix of mineral admixtures conjointly lessens the requirement for thickness increasing substance admixtures. The lower water substance of the solid expert to raised toughness, moreover to raised mechanical trustworthiness of the structure. Selfcompacting concrete (SCC) is a creative concrete that doesn't include any vibration for putting and compaction. It will flow underneath its own weight, entire filling formwork and achieving full compaction, even within the presence of clogged reinforcement. Self-compacting concrete suggests an expedient rate of concrete arrangement, with quicker construction times and simple flow across clogged reinforcement.
Cement 53-grade OPC was utilized within the examination requiring a selected gravity of three .12, fineness of cement as 7.5 nothing and primary and final setting times of cement were twenty eight minimum and 570 minimum severally.
River sand as fine aggregate was used. The specific gravity and bulk density of sand were a pair of. 68  Glenium B233 is an admixture of a new generation supported made-to-order polycarboxylic ether having relative density of 1.09 & solid contents not 30 minutes by weight. Optimum indefinite quantity of Glenium B233 should be finished up with preliminary mixes. As a guide, some range of 500 ml to 1500ml per 100kg of cementitious material is for the most part suggested.
Glenium Stream 2 might be a head prepared to-utilize, fluid, natural, viscosity-modifying admixture (VMA) exclusively made for producing concrete with expanded viscosity and controlled rheological properties. During this investigation, the proportion of body modifying agent is taken as 0.082% for 1 kg/m3.
The mix proportioning was done by the approach of EFNARC guidelines for mix design for blending concrete M40 with replacement of GGBS in various dosages is tabulated with Table 2. Various dosages of GGBS has 10%, 20%, 30%, 40%, and 50%, of several mix proportions are determined, in which the optimum dosage of GGBFS will attained for M40 grade of concrete with super plasticizer Glenium B233 and Glenium Stream 2 as viscosity modifying agent is added to the concrete while constructing the mix of the weight of the cement content. Though the specimens samples of M40 grade concrete specimens made with optimum amount of GGBFS replacement were casted.
Here is no detail system on behalf of SCC mix design and various scholarly foundations, admixtures, ready-mixed precast plants, and creating ventures have planned their particular mix proportioning ways. Further information on combine mix and on techniques of evaluating the properties of SCC is discovered within the EFNARC guidelines for SCC.
The estimation of slump is to be 550 millimeter least and of 800 millimeter most for a new SCC. The slump values and T50 values for different mixes are appeared in Table 4. And furthermore the deviation of the slump with the mixes are shown inside the Fig 1. T50 test is that the time take for a particular mix to achieve 500mm slump. This facilitates to grasp the filling ability of SCC mix difference of T50 with the combination is shown in the   Table 4.