Article 2023 · 37 citations

Effect of using wastewater from the ready-mixed concrete plant on the performance of one-part alkali-activated GBFS/FA composites: Fresh, mechanical and durability properties

Bodur, Burak, Bayraktar, Oguzhan Yavuz, Benli, Ahmet, Kaplan, Gokhan, Tobbala, Dina E., Tayeh, Bassam

Abstract

Water scarcity is the world's most pressing issue, as concrete batching facilities and concrete mixer trucks produce massive amounts of wash water every day. Recycling waste water from ready-mix concrete factories' concrete washing water is critical for conserving hundreds of millions of tons of water and preventing water and soil contamination. This study examined the impact of waste washing water on the microstructural, durability, fresh, and mechanical characteristics of one-part alkali-activated ground blast furnace slag (GBFS)/fly as (FA) composites (AAC) containing partial and complete replacement of tap water under ambient conditions. GBFS was used as the main binder in the production of AAC. FA was also used as a binder at 0%, 25%, and 50% instead of GBFS. Sodium metasilicate (MS) was used as a one-part activator at two dosages 7.5% and 15% of the total binder. The fresh properties (setting time and flowability), physical properties, compressive and flexural strength (3, 7, 28, 90, and 180 days) and durability (hightemperature resistance, freeze, and thaw resistance, drying shrinkage, sorptivity, HCl and MgSO4 resistances, NaCl effect and alkali-silica reaction) and microstructure analysis were investigated. The findings showed that the use of wastewater (WW) instead of tap water (TW) contributed positively or had no serious negative effect on the mechanical and durability properties of AAC. Compressive strength of 72.37 MPa and 81.67 MPa was gained with the inclusion of 50%WW at 7.5 and 15 %MS content respectively. The findings showed that WW improved the workability of fresh ACC containing FA, reduced dry shrinkage and sorptivity of ACC with 15%MS content, and refined the pores of hardened ACC. The results also supported that WW contributed to the decrease in expansion due to ASR and sulfate expansion. Using WW improved the high temperature and F-T resistance of ACC mixtures containing 15%MS content.

Keywords

One -part alkali -activated composites Waste washing water Mechanical properties Durability ASH GEOPOLYMER CONCRETE FLY-ASH COMPRESSIVE STRENGTH ELEVATED-TEMPERATURE PORTLAND-CEMENT SLAG MORTARS REUSE RESISTANCE EVOLUTION

WoS Categories

Construction & Building Technology Engineering, Civil

Sustainable Development Goals

Responsible Consumption and Production

Citation

Journal: JOURNAL OF BUILDING ENGINEERING
Year: 2023
Volume: 76
eISSN: 2352-7102
DOI: 10.1016/j.jobe.2023.107167
WoS UID: WOS:001056752100001

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