scholarly journals Mechanical Performance of Concrete with Partial Replacement of Sand by Sewage Sludge Ash from Incineration

2012 ◽  
Vol 730-732 ◽  
pp. 462-467 ◽  
Author(s):  
A. Jamshidi ◽  
M. Jamshidi ◽  
N. Mehrdadi ◽  
A. Shasavandi ◽  
F. Pacheco-Torgal
Keyword(s):  
Sewage Sludge ◽  
Environmental Problem ◽  
Mechanical Performance ◽  
Waste Water Treatment ◽  
Xrd Analysis ◽  
Mechanical Tests ◽  
Partial Replacement ◽  
Sewage Sludge Ash ◽  
Sludge Ash ◽  
Ash Disposal

The production of sewage sludge from waste water treatment plants is increasing all over the world. Disposal of sewage sludge ash is a serious environmental problem. If we think of the areas needed for sludge ash disposal, we clearly understand the importance of reusing sewage sludge ash in concrete. This paper presents results related to the replacement of sand by sewage sludge ash. The sludge was characterized for chemical composition (XRF analysis), crystalline phases (XRD analysis) and pozzolanic activity. The effects of incineration on crystal phases of dry sludge were investigated. Two (W/C) ratios (0.55 and 0.45) and three sludge percentages (5%, 10% and 20%) by cement mass were used. The mechanical performance of SSAC at different curing ages (3, 7, 28 and 90 days) was assessed by means of mechanical tests. Results show that sewage sludge ash leads to a reduction in density and mechanical strength. Results also show that concrete with 20% of sewage sludge ash and W/C=0.45 has a 28 day compressive strength of almost 30MPa.

scholarly journals Partial replacement of rock phosphate by sewage sludge ash for the production of superphosphate fertilizers

2020 ◽  
Vol 183 (2) ◽  
pp. 233-237
Author(s):  
Tobias Edward Hartmann ◽  
Kurt Möller ◽  
Carsten Meyer ◽  
Torsten Müller
Keyword(s):  
Sewage Sludge ◽  
Rock Phosphate ◽  
Partial Replacement ◽  
Sewage Sludge Ash ◽  
Sludge Ash

scholarly journals Determination of hygrothermal properties of cementitious mortar: The effect of partial replacement of cement by incinerated sewage sludge ash

2018 ◽  
Vol 42 (6) ◽  
pp. 771-787 ◽  
Author(s):  
Barbora Krejcirikova ◽  
Carsten Rode ◽  
Ruut Peuhkuri
Keyword(s):  
Thermal Conductivity ◽  
Sewage Sludge ◽  
Water Vapour ◽  
Sorption Isotherms ◽  
Water Vapour Permeability ◽  
Partial Replacement ◽  
Vapour Permeability ◽  
Sewage Sludge Ash ◽  
Sludge Ash ◽  
The Impact

Two sewage sludge ashes were used as substitutes for cement and their effect on the hygrothermal properties of mortar was examined. Different cement to ash ratios and two ash pre-treatment methods (water washing and grinding) were in focus. The impact of cement replacement by sewage sludge ashes on thermal conductivity, sorption isotherms, water vapour permeability and carbonation was described with standard cement-based mortar as the reference material. Measurement results showed that thermal conductivity decreased by 15% when 30% of the cement was replaced by sewage sludge ash. Water vapour permeability increased as the cement to ash ratio was reduced. Sorption was tested by two methods; although differences in the sorption isotherms of mortars were reported when a climatic chamber method was applied, no differences, or only minor differences, were observed with the desiccator method. Measurements revealed that cement-based mortar possessed a higher content of carbonate than cement-ash-based mortar, and it thus appears that the carbonation rate was higher when the cement content was high.

scholarly journals The hygrothermal assessment of cement-ash-based mortar

2021 ◽  
Vol 2069 (1) ◽  
pp. 012193
Author(s):  
Barbora Krejcirikova ◽  
Carsten Rode ◽  
Pawel Wargocki ◽  
Jakub Kolarik ◽  
Ruut Peuhkuri
Keyword(s):  
Sewage Sludge ◽  
Wastewater Treatment Plants ◽  
Sorption Isotherms ◽  
Cement Industry ◽  
Partial Replacement ◽  
Porous Structures ◽  
Sewage Sludge Ash ◽  
The World ◽  
Cement Based Materials ◽  
Sludge Ash

Abstract Cement is the second most consumed substance by weight in the world, after water. The growing demand for reduced emissions of CO2 urges the cement industry to find materials with a low CO2 footprint, which calls for cement substitution. An assumption of the study has been that sewage sludge ash (SSA), an industrial by-product, can be applied as a potential cement substitute in cement-based materials without compromising material performance. The study investigated the effect of partial replacement of cement by SSA in mortar on hygrothermal properties of mortar. Two sewage sludge ashes originated from wastewater treatment plants located in the Greater Copenhagen area, Denmark. SSAs consisted of larger particles compared to cement particles; thus cement-ash-based mortar resulted in more porous structures compared to cement-based mortar. The higher porosity was responsible for a decrease of the thermal conductivity of the mortar. Significant differences were recognized in sorption isotherms of individual components, i.e. cement and ashes. However, their effect on the sorption isotherms of the mortars was minor.

scholarly journals Sewage sludge ash (SSA) in high performance concrete: characterization and application

2016 ◽  
Vol 9 (6) ◽  
pp. 989-1006 ◽  
Author(s):  
C. M. A. Fontes ◽  
◽  
R. D. Toledo Filho ◽  
M. C. Barbosa ◽  
Keyword(s):  
Sewage Sludge ◽  
High Performance ◽  
High Performance Concrete ◽  
Mechanical Tests ◽  
Chloride Ions ◽  
Mineral Admixture ◽  
Sewage Sludge Ash ◽  
Calcination Process ◽  
Concrete Characterization ◽  
Sludge Ash

ABSTRACT Sewage sludge originated from the process of treatment of wastewater has become an environmental issue for three main reasons: contains pathogens, heavy metals and organic compounds that are harmful to the environmental and human health; high volumes are daily generated; and shortage of landfill sites for proper disposal. This research deals with the viability study of sewage sludge utilization, after calcination process, as mineral admixture in the production of concrete. High-performance concretes were produced with replacement content of 5% and 10% by weight of Portland cement with sewage sludge ash (SSA). The influence of this ash was analyzed through physical and mechanical tests. Analysis showed that the mixtures containing SSA have lower values of compressive strength than the reference. The results of absorptivity, porosity and accelerated penetration of chloride ions, presents that mixtures containing ash showed reductions compared to the reference. This indicates that SSA provided refinement of the pore structure, which was confirmed by mercury intrusion porosimetry test.

scholarly journals Concrete for Precast Blocks: Binary and Ternary Combination of Sewage Sludge Ash with Diverse Mineral Residue

Materials ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 4634
Author(s):  
Francisco Baeza-Brotons ◽  
Jordi Payá ◽  
Oscar Galao ◽  
Marcos Alberti ◽  
Pedro Garcés
Keyword(s):  
Sewage Sludge ◽  
Portland Cement ◽  
Water Absorption ◽  
Reference Sample ◽  
Ultrasonic Pulse Velocity ◽  
Mechanical Tests ◽  
Pulse Velocity ◽  
Sewage Sludge Ash ◽  
Mineral Additions ◽  
Sludge Ash

This paper proposes binary and ternary combinations of sewage sludge ash (SSA) with fly ash (FA), marble dust (MD) and rice husk ash (RHA) as partial replacements of Portland cement in concretes with a similar dosage to that used in precast blocks, with very dry consistency. Several physical-mechanical tests were carried out on concrete specimens with curing ages of 28 and 90 days: density, water absorption, capillary water absorption, ultrasonic pulse velocity and compressive strength. The combinations of residues significantly improve the properties of the cementitious systems: 30% replacement of Portland cement provides strength values similar to the reference sample, showing the synergetic effects of the combination of the mineral additions. The significance of this research relies on the combined use of the mineral additions as well as the use of them for the precast block industry. The results show synergies among the additions and even that some of them showed relevant improvements when they are used in combination, performing better than when used individually.

Study of the Potential of Adhesion to the Substrate of Masonry and Tensile in the Flexion in Mortars of Coating with Gray of the Sewage Sludge

2020 ◽  
Vol 1012 ◽  
pp. 256-261
Author(s):  
João Victor da Cunha Oliveira ◽  
Leila Soares Viegas Barreto Chagas ◽  
Frankslale Fabian Diniz de Andrade Meira ◽  
Arnaldo Manoel Pereira Carneiro ◽  
Antônio Acácio de Melo Neto
Keyword(s):  
Tensile Strength ◽  
Sewage Sludge ◽  
Calcination Temperature ◽  
Partial Replacement ◽  
Sewage Sludge Ash ◽  
Flexural Tensile Strength ◽  
Hydraulic Binder ◽  
Strength Tests ◽  
Sludge Ash

This work evaluates mortars using sewage sludge calcined at temperatures of 600°C and 700°C as a hydraulic binder replacing the cement. The percentages incorporated by mass to replace the Portland cement were 10%, 20% and 30%, using the 1:3:0,60 (cement: sand: factor a/c) trace. Sludge ash was characterized and tensile strength at flexion as well as tensile strength (pullout test) were evaluated. As a way of performing a comparison with conventional mortars, the same tests were carried out using reference mortar. The results of the flexural tensile strength tests indicated that results were higher than the reference traces of the mortars with the calcined sludge at a temperature of 700°C, a factor related to the increase of the calcination temperature and the incorporated percentage. With respect to the tests on the determination of tensile strength, it was observed that the specimens submitted to the test suffered rupture in the mortar, and that the calcination temperature of the sewage sludge was not influenced. The results obtained with the mortars using sewage sludge ash with partial replacement of the cement are shown within the normative standards and approximate to the results obtained with the tests executed with the reference mortar.

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