Concretes and mortars with waste paper industry: Biomass ash and dregs

Using industrial wastes and local materials as artificial aggregates in cement based materials remains a relevant measure for conservation of natural sources. In this study, novel cementitious mixes containing pulverized ceramic blended cement, ceramic aggregate and laterite were systematically combined to produce cement mortars. The mortar specimens were cured in water for a maximum of 28 days. At maturity, nondestructive tests, X-ray CT scan and Ultrasonic pulse velocity, were performed on hardened mortars. Thereafter, a series of predefined properties, namely dry bulk density, compressive and flexural strength, water absorption coefficient (due to capillary) of the hardened mortars were determined. Finally, in order to understand the hydration mechanism of the materials as it relates to the strength properties, microscale tests, SEM and XRD, were used to examine the fragments of the selected mortars. From the results, a mortar sample containing 10% ceramic powder and 100% ceramic aggregate as replacements for cement and sand respectively, gave higher strength values than the reference and other mixes.Microstructural analysis of the best mix revealed that it has larger proportions of ettringite, portlandite and calcite than the reference mix, and this could be responsible for the strength 2 gained. Thus, despite the apparent low reactivity of crushed ceramic material, this can improve bonding in cement-based mixture, when used at an appropriate concentration.

show abstract

“…In recent years, mortars made with various modified materials have been investigated [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Suitability of mortars produced using laterite and ceramic wastes: Mechanical and microscale analysis

Awoyera

Dawson

Thom

et al. 2017

Construction and Building Materials

View full text Add to dashboard Cite

show abstract

“…Due to the presence of reactive silicates and calcium carbonate in PPFA, it can be substituted as a supplementary cementitious material for more environmentally friendly cement/clinker manufacturing [89]. Moreover, it is useful as a partial replacement for cement and small aggregates in building concrete [90][91][92][93][94]. The development of alternative value-added geomaterials from PPFA for mortar/concrete manufacturing demands a comprehensive study of rheological properties and the mechanical performance of the new composite material [91].…”

Section: Supplementary Cementitious Materials In Construction Industrymentioning

confidence: 99%

Pulp and Paper Mill Fly Ash: A Review

Cherian

Siddiqua

2019

Sustainability

View full text Add to dashboard Cite

The continual growth of pulp and paper industry has led to the generation of tremendous volumes of fly ash as byproducts of biomass combustion processes. Commonly, a major part of it is landfilled; however, updated environmental regulations have tended to restrict the landfilling of fly ash due to rising disposal costs and the scarcity of suitable land. The pulp and paper industries are therefore urgently seeking energy-efficient mechanisms and management for the beneficial use of fly ash in an ecological and economical manner. This paper offers a comprehensive review of existing knowledge on the major physicochemical and toxicological properties of pulp and paper mill fly ash to assess its suitability for various bound and unbound applications. The current state of various methods used for the valorization of pulp and paper mill fly ash into more sustainable geomaterials is briefly discussed. This paper also presents promising and innovative applications for pulp and paper mill fly ash, with particular reference to agriculture and forestry, the construction and geotechnical industries, and the immobilization of contaminants. It was identified from a literature review that modified pulp and paper mill fly ash can be environmentally and economically advantageous over commercial coal-based fly ash in various sustainable applications.Sustainability 2019, 11, 4394 2 of 16 use of compost products, etc., are drawbacks of composting [10]. Contaminant-free PPFA has great significance as a soil liming agent and fertilizer in agriculture and forestry [6,11]; however, its direct application requires safety precautions due to its undesirable handling and spreading characteristics and associated health risks [12,13]. Further, high pH and electrical conductivity values of pore water in wood ash might have perturbing effects on the microbial community [14]. In order to withstand extreme conditions, the bacteria may enter a dormant stage, thereby decreasing the microbial population and diversity and ultimately disturbing the ecological balance. PPFA and value-added materials also have multifunctional engineering applications, such as supplementary cementitious material (SCM) in concrete systems, aggregate in pavement construction, binder for soil stabilization, and adsorbent for the immobilization of toxic heavy metals [15][16][17][18][19][20][21][22][23]. Based on a statistical survey conducted on the management and utilization of boiler ashes generated at Canadian pulp and paper mills, it was reported that more than 50% of ash is landfilled, 20-25% is used as a soil amendment (direct application or compost), and less than 20% is used for other beneficial applications such as the construction of embankment fills, the stabilization of pavement layers, and the solidification of wastes. [1,2].This paper reviews the existing knowledge on physicochemical and toxicological properties of PPFA in order to assess its suitability as a sustainable geomaterial for various bound and unbound applications. The bound applications of fly ash in...

show abstract

“…The best results were obtained at 28 days for samples prepared with cement CPI-S-32, ash (10 wt%) and grits (10 wt%). Martínez-Lage et al [105] studied the use of green liquor dregs and biomass fly ash to fabricate mortars and concrete. Different mortars were fabricated replacing 10, 20 or 30 wt% of cement by biomass fly ash and dregs.…”

Section: Mixtures Of Wastesmentioning

confidence: 99%

Wastes from pulp and paper mills - a review of generation and recycling alternatives

et al. 2018

View full text Add to dashboard Cite

The production of pulp and paper is increasing worldwide, and wastes are therefore being generated in appreciable amounts. Various materials are generated in pulp and paper mills, such as ash, dregs, grits, lime mud and pulp mill sludge. Over the years, these wastes have typically been sent to landfills or incinerated. However, with increased environmental awareness new alternatives have been investigated, especially the valorization of these materials. In this review, the characteristics of the manufacturing process, generated wastes, main destinations and recycling alternatives are addressed. The state of the art indicates that dregs are useful in agriculture as soil amendments, while lime mud can be used in agriculture and in environmental technology, mainly in wastewater treatment. Grits are commonly employed in construction, and pulp mill sludge shows applications in agriculture, construction and energy processes. In conclusion, this review shows several successful cases of recycling wastes from pulp and paper mills.

show abstract

Concretes and mortars with waste paper industry: Biomass ash and dregs

Cited by 63 publications

References 14 publications

Suitability of mortars produced using laterite and ceramic wastes: Mechanical and microscale analysis

Suitability of mortars produced using laterite and ceramic wastes: Mechanical and microscale analysis

Pulp and Paper Mill Fly Ash: A Review

Wastes from pulp and paper mills - a review of generation and recycling alternatives

Contact Info

Product

Resources

About