Partial Replacement of Cement by Waste Paper Pulp Ash and Its Effect on Concrete Properties

Mitikie, Bahiru Bewket; Waldtsadik, Daniel Tekalign

doi:10.1155/2022/8880196

Cited by 10 publications

(7 citation statements)

References 3 publications

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“…Their Al 2 O 3 concentration was much higher (13.24 wt.%) than that observed in this study (4.2 wt.%). In another study, Mitikie et al [39] reported an ash composition similar to that reported here for paper industry sludge, with the exception of the CaO (53.14 wt.%) content, which was higher than in the pulp sludge used in this study (16.53 wt.%). This difference may be attributable to the wastewater treatment and pulping processes.…”

Section: Ash Compositionsupporting

confidence: 84%

Torrefaction of Pulp Industry Sludge to Enhance Its Fuel Characteristics

2022

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Recently, under COP26, several countries agreed to phase-out coal from their energy systems. The torrefaction industry can take advantage of this, as the fuel characteristics of torrefied biomasses are comparable to those of coal. However, in terms of economic feasibility, torrefied biomass pellets are not yet competitive with coal without subsidies because of the high price of woody biomass. Thus, there is a need to produce torrefied pellets from low-cost feedstock; pulp industry sludge is one such feedstock. In this context, this study was focused on the torrefaction of pulp industry sludge. Torrefaction experiments were carried out using a continuous reactor, at temperatures of 250, 275, and 300 °C. The heating value of the sludge increased from 19 to 22 MJ/kg after torrefaction at 300 °C. The fixed carbon content increased from 16 wt.% for dried pulp sludge to 30 wt.% for torrefied pulp sludge. The fuel ratio was in the range of 0.27 to 0.61. The ash content of the pulp sludge was comparable to that of agricultural waste, i.e., around 12 wt.% (dry basis). The cellulose content in the sludge was reduced from 35 to 12 wt.% at 300 °C. Ash related issues such as slagging, fouling, and bed agglomeration tendency of the sludge were moderate. This study shows that torrefaction treatment can improve the fuel properties of pulp industry sludge to a level comparable to that of low-rank coal.

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Section: Ash Compositionsupporting

confidence: 84%

Torrefaction of Pulp Industry Sludge to Enhance Its Fuel Characteristics

2022

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“…Recently, it has been reported that waste paper ash (WPA) can be used to modify the plaster of Paris (POP) ceiling for improved performance [14]. Also, the utilization of WPA as a partial cement replacement material can improve the compressive strength of masonry materials such as concretes [15][16][17][18] and concrete blocks [19]. WPA is an effective stabilizer of clay soil for either road construction [20] or building design [3].…”

Section: Introductionmentioning

confidence: 99%

Recycling of waste papers: yield and quality of the ash-derived materials

Robert,

Etuk,

Agbasi

et al. 2024

ETJ

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This research was designed to assess the yield and quality of ash prepared from different types of waste papers. Waste newspapers, writing papers, and cartons were selected for combustion to obtain the ashes and coded as WNPA, WWPA, and WCPA, respectively. The waste papers were incinerated simultaneously in separate but identical incinerators at 850 ℃. An experiment on the yield of the ashes was performed on two days before the ashes obtained were mixed based on the type of waste papers from which they were derived. The results showed that irrespective of the day and time, the WCPA was the most yielded (14.1%), followed by the WWPA (12.3%), and then the WNPA (11.9%). Also, it was found that all the ashes possessed flow properties acceptable for engineering applications. However, the WCPA would ensure the best performance if applied, especially as a partial replacement material for cement. While the WWPA was found to be richer than the WNPA, the WCPA was the richest in terms of the proportions of key oxides for strength development. In general, the percentages of various chemical components of each ash complied with the standard specifications for cement except in the case of losses on ignition of the WNPA and WWPA, which were about 0.53% and 0.02%, respectively, beyond the maximum stipulated value.

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“…Te review of studies about waste paper sludge ash [24][25][26][27][28][29] shows that these materials can be used as a partial replacement for cement. Although waste paper sludge ash can improve the durability properties of concrete, it has little efect on improving the mechanical properties of concrete.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Feasibility of Using Concrete Containing Waste Paper Sludge Ash and Pozzolanic Materials to Repair Bridge Stub Columns

Delaram

Mohammadi

Adlparvar

2023

Advances in Civil Engineering

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In most cases, the bridge columns are underwater, and there is a risk of corrosion. The columns of marine structures and docks also include such problems. In addition to the problem of environmental hazards, the bridge columns may fail due to design problems or increasing needs. The use of waterproof concrete materials as a jacket can have a role in increasing the life of bridges. Studies in recent years show that some waste from paper industries can be used in the construction industry. In the present study, several concrete stub columns were built as bridge columns and retrofitted with concrete jackets containing waste paper sludge ash, silica nanoparticles, aluminium oxide nanoparticles, and acrylic resin. The variables included the geometric shape of the column (square and circular) and the type of nanoparticles used in the jackets (silica and aluminium oxide nanoparticles), and the curing environment of the columns (normal and sulfate environments). The combined use of nanomaterials and waste paper ash is the most important novelty of the present study. The axial loading test was performed on the columns, and the load-deflection diagrams were obtained. The ductility, stiffness, load-bearing capacity, and crack distribution were among the parameters that were used to compare different modes. The proposed jackets increased the carrying capacity by 10 to 38%, depending on the processing curing environment and the type of nanoparticles. The combined use of aluminium oxide nanoparticles and waste paper ash can improve compressive, tensile, and flexural strengths and increase the axial load capacity of bridge columns. The proposed concrete jacket effectively reduces the corrosion of concrete and steel reinforcement and improves the bridge’s useful life.

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Partial Replacement of Cement by Waste Paper Pulp Ash and Its Effect on Concrete Properties

Cited by 10 publications

References 3 publications

Torrefaction of Pulp Industry Sludge to Enhance Its Fuel Characteristics

Torrefaction of Pulp Industry Sludge to Enhance Its Fuel Characteristics

Recycling of waste papers: yield and quality of the ash-derived materials

Investigating the Feasibility of Using Concrete Containing Waste Paper Sludge Ash and Pozzolanic Materials to Repair Bridge Stub Columns

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