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 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 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 THE USE OF SEWAGE SLUDGE AND ITS ASH IN CONSTRUCTION AND AGRICULTURE INDUSTRY: A REVIEW

2019 ◽  
Vol 81 (5) ◽  
Author(s):  
Mohd Amin Shafii ◽  
Eunice Chia Mei Ling ◽  
Ekarizan Shaffie
Keyword(s):  
Chemical Composition ◽  
Sewage Sludge ◽  
Soil Stabilization ◽  
Treatment Plant ◽  
Sewage Sludge Ash ◽  
Local Municipalities ◽  
Agriculture Industry ◽  
The World ◽  
Cement Mixture ◽  
Sludge Ash

Harmful sewage sludge generated from wastewater treatment plant being disposed to landfill has long caused major anxiety in local municipalities around the world. In line with the concept of sustainable development practice being adopted around the world, more efforts has looked deeper into ways to reuse this waste material and one of it was the ash generated from this material. This paper review the use of sewage sludge and sewage sludge ash (SSA) in construction and agriculture industry through a multi-faceted review of previous researches done in various industries. Besides reducing the amount of waste in landfill, this solution can also contribute to the reduction of natural resources consumption. It examines in detail how the various burning temperature can affect the sewage sludge ash as well as the potential usage of this ash in asphalt, concrete and cement mixture, soil stabilization and agriculture either as a substitute material, or as a raw and enhancement material. The various chemical composition in this ash enable the SSA to be used in application in multiple industry as each of the respective chemical composition bring enhancement to the end product respectively.

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.

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.

Recovery of phosphorus and aluminium from sewage sludge ash by a new wet chemical elution process (SESAL-Phos-recovery process)

2011 ◽  
Vol 64 (3) ◽  
pp. 693-699 ◽  
Author(s):  
S. Petzet ◽  
B. Peplinski ◽  
S. Y. Bodkhe ◽  
P. Cornel
Keyword(s):  
Sewage Sludge ◽  
Wastewater Treatment Plants ◽  
Recovery Process ◽  
Phosphorus Recovery ◽  
Alkaline Solutions ◽  
Aluminium Phosphate ◽  
Sewage Sludge Ash ◽  
Dissolved Phosphorus ◽  
Wet Chemical ◽  
Sludge Ash

The potential of a new wet chemical process for phosphorus and aluminium recovery from sewage sludge ash by sequential elution with acidic and alkaline solutions has been investigated: SESAL-Phos (sequential elution of sewage sludge ash for aluminium and phosphorus recovery). Its most innovative aspect is an acidic pre-treatment step in which calcium is leached from the sewage sludge ash. Thus the percentage of alkaline soluble aluminium phosphates is increased from 20 to 67%. This aluminium phosphate is then dissolved in alkali. Subsequently, the dissolved phosphorus is precipitated as calcium phosphate with low heavy metal content and recovered from the alkaline solution. Dissolved aluminium is recovered and may be reused as a precipitant in wastewater treatment plants.

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