EFFECT OF GGBFS DOSAGE ON COMPRESSIVE STRENGTH, WORKABILITY, AND DURABILITY OF CONCRETE WITH CRUSHED ROCK FINES

Registration ID: IJNRD_326732

Published ID: IJNRD2606451

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Shravya Sripadapu, Bhukya Naresh, Venu Sipelli

Concrete, Ground granulated blast furnace slag (GGBFS) replacement level, Crushed rock fines, Workability, Compressive strength, Ultrasonic pulse velocity.

This research paper attempts to study the influence of higher quantities of GGBFS replacement on the fresh, mechanical, non-destructive and durable characteristics of concrete mixes containing 100% CRF as complete fine aggregate replacement for conventional sand. A full factorial experimentation design of 3x3 was adopted where nine different concrete mixes were studied for varying levels of three GGBFS substitution rates (40%, 50%, and 60%) of total cementitious materials mass used in three different design grade mixes as per IS 10262:2019 (M30, M40, and M50). The fresh characteristics of the concrete mixes were determined through slump test and compaction factor test. The mechanical properties of hardened concrete mixes were determined using destructive compressive strength tests at 7, 14, 28, and 56 days along with the non-destructive UPV analysis, Rapid Chloride Penetration Test (RCPT) and Water Permeability Test (WPT). Experimental findings indicate that the concrete mixes having 40% GGBFS can be effectively utilized as structural baseline mixes due to their better compressive strengths than their codal target mean values of 44.69, 51.78, and 63.43 MPa for the M30, M40, and M50 mixes, respectively, which are greater than their codal target mean strengths by 7.3% to 16.8% (3.53 to 6.44 MPa). All non-invasive UPV tests conducted for the nine different arrangements showed the velocities firmly within the range of 4.51 to 4.79 km/s, thereby categorizing the entire matrix in the "Excellent" quality level of structural performance according to IS 516 (Part 5/Section 1):2018. For both performance grades and curing age, there was a gradual fall in compressive strength upon increasing the amount of replacement of GGBFS from 40% to 60%, which was significantly high at an early age (7 days) with a decrement of 42.1% for M30 and 45.1% for M50, which gradually narrowed down to the range of 33.6% to 37.1% at 28 days. In each of the particular grades, there was a small and parallel decrease in the UPV value with the above drop in mechanical strength, which was due to the effect of change in matrix density owing to the low hydration rate and delayed alkaline activation of the binder. In contrast to transient performance changes related to mechanical strength, durability and transport performance showed very good values, independent of any variation in the binder; total charges were limited between 1237 and 1312 Coulombs ("Low" chloride ion penetrability according to ASTM C1202), and maximum water penetration depths showed constant values between 12 and 17 mm. The key result obtained during this study is that despite the significant influence of GGBFS content on early-mid mechanical strength, it does not cause any detrimental effects on microstructure and quality in the examined range of 40–60%. In conclusion, the 40% GGBFS substitution is the optimal choice for structural elements under strict loading and strength requirements in the early age, and 50-60% substitution levels show highly promising and environmentally friendly combinations for infrastructure elements where the strength development is not constrained.

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Shravya Sripadapu, Bhukya Naresh, & Venu Sipelli (June-2026). EFFECT OF GGBFS DOSAGE ON COMPRESSIVE STRENGTH, WORKABILITY, AND DURABILITY OF CONCRETE WITH CRUSHED ROCK FINES. INTERNATIONAL JOURNAL OF NOVEL RESEARCH AND DEVELOPMENT, 11(6), e443-e450. https://ijnrd.org/papers/IJNRD2606451.pdf

Volume 11 Issue 6, June-2026

Pages : e443-e450

Paper Reg. ID: IJNRD_326732

Published Paper Id: IJNRD2606451

Research Area: Other area not in list

Author Type: Indian Author

Country: Rangareddy, Telangana, India

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