Strain Hardening of Polypropylene Microfiber Reinforced Composite Based on Alkali-Activated Slag Matrix

Abstract

A comparative study of the fracture features, strength and deformation properties of pseudo strain-hardening composites based on alkali-activated slag and Portland cement matrices with polypropylene microfiber was carried out. Correlations between their compositions and characteristics of stress–strain diagrams under tension in bending with an additional determination of acoustic emission parameters were determined. An average strength alkali-activated slag matrix with compressive strength of 40 MPa and a high-strength Portland cement matrix with compressive strength of 70 MPa were used. The matrix compositions were selected for high filling the composites with polypropylene microfiber in the amount of 5%-vol. and 3.5%-vol. ensuring the workability at the low water-to-binder ratios of 0.22 and 0.3 for Portland cement and alkali-activated slag matrices, respectively. Deformation diagrams were obtained for all studied compositions. Peaks in the number of acoustic signals in alkali-activated slag composites were observed only in the strain-softening zone. Graphs of dependence of the rate of acoustic events occurrence in samples from the start of the test experimentally prove that this method of non-destructive testing can be used to monitor structures based on strain-hardening composites.

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

“…1,2 One of the significant causes of increasing land pollution is disposing of waste glass powder (WGP) by landfilling. 3,4 Because of the non-biodegradable nature of glass, disposing of it by landfilling is not a good option because it is not environmentally friendly. 5 Therefore, various methods have been adopted to decrease this problem.…”

“…Land pollution is increasing daily because of the increase in the rate of waste material landfilling 1,2 . One of the significant causes of increasing land pollution is disposing of waste glass powder (WGP) by landfilling 3,4 . Because of the non‐biodegradable nature of glass, disposing of it by landfilling is not a good option because it is not environmentally friendly 5 .…”

The Present State of the Use of Waste Wood Ash as an Eco-Efficient Construction Material: A Review

“…Ekaputri reported [ 36 ] obtaining a concrete (geopolymer) with high compressive strength (48.5 MPa to 48.5 MPa) from class F ash with 10 mol/L NaOH due to the generation of hydroxide ions that significantly influence the dissolution of the Si and Al atoms of the source material. Despite the advantages of using high concentrations of alkali (NaOH, between 8–10 M) to obtain a high compression strength product of 104.5 MPa and 71 MPa for the paste and mortar, as well as a lower change in length due to temperature and water evaporation that have the lowest shrinkage percentage [ 37 ], it has been proven that the use of ashes from forest biomass (wood) can decrease the requirements of alkaline activators by up to 20% without the loss of properties [ 38 , 39 , 40 , 41 ]. However, when the substitution level of these ashes is higher than 10% by mass, the mechanical properties of the geopolymer are affected [ 42 , 43 , 44 , 45 ], proportionally reducing the compressive and flexural strength of the mortars, for all curing times [ 35 ].…”

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].…”