Evaluating the influence of fly ash and waste glass on the characteristics of coconut fibers reinforced concrete

Abstract

The disposal of waste from coal plants and waste glass (WG) is causing significant environmental problems all around the planet. Currently, the amount of discarding of these wastes is increased. One possible option is to utilize fly ash (FA) from coal plants as a partial substitute for the cement and EG as a fractional substitute for sand in concrete, respectively. Besides, fibers can improve the strength and durability of concrete; explicitly speaking, using coconut fibers (CFs) is in trend due to their highest toughness among natural fibers making it suitable material as fiber reinforcement in concrete. This research studies the concrete behavior with 15% FA as a partial substitute of cement with 2% CFs and waste beverage glass as sand at various replacement levels (14%, 15%, 16%, 17%, 18%, 19%, and 20%). Mechanical and durability characteristics of concrete were assessed, such as compression strength, water absorption, flexural strength, density, workability, and water absorption. The current study results show that adding FA, CFs, and WG improved microstructure quality at 16% replacement of sand. The study showed that the M4 mix has enhanced the properties of concrete samples as compressive and flexural strength was improved to 47.2 and 6.2 MPa and improved apparent density by 20%. Adding more WGP than the optimal proportion (16%) led to detrimental effects on void ratio, permeability, and water absorption. Therefore, 16% of sand with WG and 15% of FA with cement can be substituted with 2% CFs to develop sustainable concrete.

Ultra-High-Performance Fiber-Reinforced Concrete: Fresh Properties

“…Concrete "workability is ˑdefined ˑas ˑthe ˑeffort ˑrequired ˑto ˑmanipulate ˑa ˑfreshly ˑmixed ˑquantity ˑof ˑconcrete ˑwith ˑminimal ˑloss ˑof ˑhomogeneity ˑ(uniformity) ˑ [15,[33][34][35]44]. ˑManipulation ˑrefers ˑto ˑthe ˑearly-age ˑprocedures ˑof ˑplacing, ˑcompacting, ˑand ˑfinishing ˑ [45].…”

“…ˑSeveral ˑimpediments ˑare ˑidentified, ˑincluding ˑa ˑlack ˑof ˑunderstanding ˑof ˑstructural ˑbehavior, ˑmaterial ˑcharacterization processes, and generally accepted ˑdesign ˑcodes. ˑThe ˑability ˑto ˑdesign ˑlightweight ˑand ˑslender ˑstructures ˑis ˑone ˑof ˑthe ˑdriving ˑelements ˑbehind ˑincreased ˑutilization [12][13][14][15]ˑ. ˑOthers ˑinclude ˑlower ˑcosts, ˑa ˑsmaller ˑenvironmental ˑfootprint, ˑand ˑfewer maintenance" requirements.…”

“…ˑKeer [30] ˑreported ˑthat ˑsynthetic ˑfiber ˑincreases ˑthe ˑpermeability ˑof ˑconcrete ˑdue ˑto ˑtheir ˑporous ˑinterfacial ˑtransition ˑzone ˑ(ITZ). ˑAs ˑfar ˑas ˑthe ˑmechanical performances of ˑconcrete ˑare ˑconcerned, ˑvarious ˑresearchers ˑ [15,[31][32][33][34][35] ˑhave ˑstudied ˑthe ˑfibers' ˑeffect ˑon ˑconcrete ˑunder ˑcompression ˑor ˑtension. ˑThey ˑhave ˑreported ˑthat ˑthe ˑfibers ˑincrease ˑthe ˑtensile ˑstrength ˑof ˑconcrete, ˑbut ˑnot ˑnecessarily ˑits ˑcompressive ˑstrength.…”

Ultra-high-performance fiber-reinforced concrete (UHPFRC): A mini-review of the challenges

“…ˑIn ˑconjunction ˑwith ˑexperimental ˑdata, ˑmathematical ˑempirical ˑmodels ˑcan be developed to determine the impacts of mixture ˑdesign ˑparameters ˑon ˑfresh ˑmortar ˑqualities ˑ(workability, ˑresistance, ˑviscosity) ˑand ˑhardened ˑmortar ˑproperties" ˑ(maximum ˑflexural ˑand ˑcompressive ˑstrength ˑand ˑtoughness ˑcharacters) ˑ [31][32][33][34][35][36][37][38][39].…”

Prediction of Splitting Tensile Strength of Self-Compacting Recycled Aggregate Concrete Using Novel Deep Learning Methods

“…In terms of the composition of concrete, coarse aggregate (natural crushed stone) and fine aggregate (sand) make up most of the selfcompacting concrete, approximately 60-70% [18][19][20]. Simultaneously, natural resources are being depleted at a high speed due to modern urbanization [21][22][23]. The primary source of well-quality aggregates, i.e., mountains, are being depleted at an alarming rate [24][25][26].…”