International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 06 | Jun 2023
p-ISSN: 2395-0072
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Experimental Investigation on Self-Compacting Mortar using GGBS and Alccofine Hemanth Kumar. H1, S. Bhavanishankar2 1PG Student, Dept. of Civil Engineering, University Visvesvaraya College of Engineering, Bengaluru, India
2Associate Professor, Dept. of Civil Engineering, University Visvesvaraya College of Engineering, Bengaluru, India
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Abstract - The primary objective of the present work is to
performance mechanisms. Mortar phase has similar properties to concrete and research on mortar is more controllable. In fact, assessing features of SCMs is an integral part of SCC design. Nowadays, most of the industrial wastes such as fly ash, silica fume, GGBS, etc. are used without being taken full advantages of their properties or disposed of rather than used. This study investigates the effects of supplementary cementitious materials mainly, GGBS and alccofine on SCM mixes prepared with suitable w/b ratio and SP dosage.
carry out an experimental investigation on rheological, mechanical and durability properties of SCM. A total of 18 mixes are proportioned where the control mix consists of 100% cement and rest of the mixes are proportioned with varying percentages of Ground Granulated Blast-furnace Slag (GGBS) and Alccofine used as partial replacement for cement. For each mix, suitable w/b ratio and SP dosage are achieved by various trials. The mixes are tested for mini slump cone and mini V-funnel in fresh state. The hardened mixes are tested for compressive strength, flexural strength, sulphate resistance and sorptivity. The results show that M0 mix (100%C) is the most flowable mix with mini slump flow diameter of 257mm and mini V-funnel time of 7.6 sec. M13 mix (70%C + 20%G + 10%A) has the highest compressive and flexural strengths of 51.17 MPa and 8.83 MPa at 28 days of curing respectively. M4 mix (60%C + 40%G) has the lowest volume expansion against sulphate attack with a change in length of 0.026% at 11 weeks of immersion in sodium sulphate solution. M17 mix (50%C + 35%G + 15%A) has the lowest sorptivity coefficient of 0.37 x 10-3 cm/sec0.5 at 90 days of curing.
2. EXPERIMENTAL PROGRAM The main purpose of this study is to investigate the rheological, mechanical and durability properties of SCM mixes with varying percentages of GGBS and alccofine. A total of 18 mixes are proportioned including the control mix. The mix ratio for all the mortar mixes is kept constant at 1:2. The w/b ratio and SP dosage are selected by evaluating the rheological properties of each mix conforming to EFNARC2005 guidelines. To evaluate the mechanical properties, the mixes are tested for their compressive strength and flexural strength. The compressive strength test is performed on cubes of size 70.6 x 70.6 x 70.6 mm at 7 and 28 days of curing. The flexural strength test is performed on prisms of size 40 x 40 x 160 mm at 7 and 28 days of curing. To evaluate the durability properties, sulphate resistance and sorptivity tests are performed on the mixes. The sulphate resistance test is carried out on prisms of size 25 x 25 x 285 mm at 28 days of curing. The sorptivity test is performed on cubes of size 70.6 x 70.6 x 70.6 mm at 90 days of curing.
Key Words: Self-Compacting Mortar, Ground Granulated Blast Furnace Slag, Alccofine, Mini Slump Flow, Mini VFunnel, Compressive Strength, Flexural Strength, Sulphate Resistance and Sorptivity.
1. INTRODUCTION Self-compacting mortar (SCM) is considered as new technology product specially preferred for the rehabilitation and repair of reinforced concrete structures. By its high fluidity, great deformability and rheological stability, the self-compacting mortar is capable of ensuring the ability to be easily implemented without vibration. However, its formulation requires a large volume of fine materials with an adequate dosage of cement, which is necessary to ensure required workability and mechanical strengths. As cement manufacturing results in emitting tons of carbon dioxide into the atmosphere, the current environmental considerations encourage reducing the production of cement. So, it is essential to use admixtures to replace cement because of their great availability, moderate price and contribution to an economic sort to solve the problems related to the environment. The mechanical and durability characteristics of self-compacting mortars are similar to self-compacting concretes and could be utilized to study the SCC
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2.1 Materials An Ordinary Portland Cement (OPC) of grade 43 conforming to IS: 8112-2013 is used to produce SCM mixes. The physical and chemical properties of cement are presented in Table 1 and Table 2 respectively. Ground Granulated Blast-furnace Slag (GGBS) and alccofine 1203 are the mineral admixtures used as partial replacements for cement. GGBS conforms to IS: 16714-2018. The physical and chemical properties of GGBS are given in Table 3 and Table 4 respectively. Alccofine 1203 conforms to IS: 16715-2018. The physical and chemical properties of alccofine 1203 are presented in Table 5 and Table 6 respectively.
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