Use of recycled non-metallic powder reclaimed from printed circuit board waste as fine aggregate in concrete

Name: Pongsatorn Saengpaeng

LCSH: Kasetsart University -- Theses. M.Eng. (Advanced and Sustainable Environmental Engineering) 2017

Classification :.LCCS: TA439

LCSH: Kasetsart University. Faculty of Engineering -- Theses

LCSH: Concrete -- Environmental aspects

LCSH: Nonmetals

LCSH: Sustainable construction

LCSH: Recycled products

Abstract: This research is aimed to study the effects of non-metallic powder (NNP) reclaimed from printed circuit board waste on physical and mechanical properties of mortar and concrete. The tests conducted on mortar with NMP included 1) flow test or flowability 2) compressive strength 3) drying shrinkage 4) thermal conductivity and 5) bulk density test in accordance with ASTM and TIS standards. Mortar specimens were mixed with NMP quantities by weight of 10, 20, 30, 40, and 50% as sand replacement, and 0% as a controlled mix. All proportional ratios of cement:sand of these mixes were kept at 1: 2.75, with water/cement ratios of 0.5 and 0.7. In addition, tests of concrete with NMP included 1) slump test or workability 2) compressive strength 3) splitting tensile strength 4) thermal conductivity 5) modulus of elasticity and 6) bulk density test in accordance with ASTM and TIS standards. Concrete specimens were mixed with NMP quantities by weight of 10, 20, 30, 40, and 50% as sand replacement, and 0% as a controlled mix. All these mixes were kept at proportional ratio of 1: 2: 4 of cement: sand: coarse aggregate, with water/cement ratios of 0.48 and 0.62 with target compressive strengths of 35 and 24 MPa, respectively. Finally, an appropriate mix was selected to study further about the economic feasibility and sensitivity analysis for a project development of future NMP concrete production. The test results of mortar and concrete satisfied the target strength of the specified standard as required. The appropriate mix of mortar was a mixture of mortar with 10% NMP replacement at the w/c ratio of 0.7, having compressive strength of 6.95 MPa. The appropriate mix of concrete was a mixture of concrete mixed with 20% replacement at the w/c ratio of 0.62, having compressive strength of 26.57 MPa and suitable workability. Subsequently the appropriate mix of concrete was employed in the study about the economic feasibility and sensitivity analysis. In feasibility analysis, the indicator of NPV is feasible for investment (NPV = 355,616 USD > 0). IRR satisfies the rate of return for investment (IRR = 335% > 10% of discount rate), while PB is less than the machinery life and the expected year, so the risk of project is acceptable (PB = 1 year < 10 year). The most sensitive factors for the sensitivity analysis are product price (selling price) and production capacity per year because these two factors are important for the economic development, and related to demand and supply of market. Under certain assumptions, results of this study suggested that a project development of concrete batching plant (ready-mixed concrete with NMP) is acceptable in terms of economic and investment in the future

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Chakrapan Tuakta

Role: Thesis Advisor

Name: Premrudee Kanchanapiya

Role: Thesis Co-Advisor

Created: 2017

Modified: 2023-06-06

Issued: 2023-06-06

วิทยานิพนธ์/Thesis

application/pdf

URL: https://kasetsart.idm.oclc.org/login?url=https://www.lib.ku.ac.th/KUthesis/2560/pongsatorn-sae-all.pdf

CallNumber: TA439.P66

eng

DegreeName: Master of Engineering

Level: Master's Degree

Descipline: Advanced and Sustainable Environmental Engineering

Grantor: Kasetsart University

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