Effects of High-Volume bottom ash on Strength, Shrinkage, and creep of High-Strength recycled concrete aggregate. (21st November 2022)

• Record Type: Journal Article
• Authors: Nakararoj, Nakarin; Nhat Ho Tran, Trinh; Sukontasukkul, Piti; Attachaiyawuth, Anuwat; Tangchirapat, Weerachart; Chee Ban, Cheah; Rattanachu, Pokpong; Jaturapitakkul, Chai
• Is Part Of: Construction & building materials. Volume 356(2022)
• Publication Date: 2022-11-21
• Subjects: Recycled concrete aggregate -- Mechanical properties -- Pozzolanic material -- High-strength concrete; OPC Ordinary Portland cement -- BA Bottom ash -- NCA Natural coarse aggregate -- RCA Recycled concrete aggregate -- NFA Natural fine aggregate (river sand) -- OBA Original bottom ash -- CBA Bottom ash passing No. 4 sieve and retained by No. 50 sieve (Coarse bottom ash) -- FBA Bottom ash passing No. 50 sieve (Fine bottom ash) -- G-OBA Ground original bottom ash -- G-CBA Ground coarse bottom ash -- G-FBA Ground fine bottom ash; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2022.129233
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: High-strength concrete using high-volume ground bottom ash and recycled aggregate was produced. Coarse bottom ash was used as fine aggregate replacement at high level in high strength concrete. Incorporation of 50% coarse bottom ash in concrete did not affect compressive strength of concrete. Using 50 % ground bottom ash can produce concrete having compressive strength of 94.5 MPa. Creep strain of concrete was closely related to its compressive strength and elastic modulus. Abstract: This research investigated the use of high-volume bottom ash in high-strength concrete containing recycled coarse aggregate (RCA). Bottom ash received directly from a power plant was sieved to separate it into two grades: 1) bottom ash that passed through a No. 50 sieve (FBA) and 2) bottom ash that passed through a No. 4 sieve and was retained on a No. 50 sieve (CBA). Then, FBA was ground to a fine powder (G-FBA) and used to replace Portland cement at 35 %–65 % by weight of binder. Also, CBA was used as a fine aggregate replacement at 50 and 100 % by volume. All high-strength concretes were tested to determine the compressive strength, elastic modulus, total shrinkage, and compression creep. The results showed that concrete containing 100 % RCA (RA concrete) had compressive strength reduced by about 10 % compared with conventional concrete (CT concrete). However, the use of high-volume G-FBA (35 to 65 % by binder weight) improved the compressive strength of concrete in the long term due to the influence of RCA. When G-FBA replaced 50 % of the ordinary Portland cement (OPC), the compressive strength of the resulting concrete was the same as that of CT concrete at 90 days, up to 94.5 MPa. For concrete incorporating G-FBA as a cement replacement and CBA as a fine aggregate replacement, the drying shrinkage was mitigated. The elastic modulus was decreased when RCA and CBA were used in concrete. Additionally, the creep strain of concrete was closely related to its compressive strength and elastic modulus; it decreased with increased compressive strength and elastic modulus. G-FBA, CBA, and RCA can be used as raw materials to make high-strength concrete more environmentally friendly and cost-effective.