Use this URL to cite or link to this record in EThOS: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.784903
Title: Recycled materials for concrete paving blocks
Author: Wang, X.
Awarding Body: University of Liverpool
Current Institution: University of Liverpool
Date of Award: 2019
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Abstract:
This research aims to study the properties' variations of concrete paving blocks mixed with multiple construction wastes, including recycled concrete coarse aggregate (RCCA), recycled concrete fine aggregate (RCFA), crushed glass (CG), crumb rubber (CR), and ground granulated blast furnace slag (GGBS), with different percentage, and design the optimal mix proportion for concrete paving blocks mixed with those waste materials. Concrete paving blocks that contain a single type of recycled material with different percentages were manufactured to obtain the ranges of replacement levels for each type of waste material that ensure the blocks' five properties, including compressive strength, tensile splitting strength, water absorption, slip resistance, and abrasion resistance, can meet the British standard BS EN 1338: 2003's requirements. Then a series of orthogonal experimental designs were carried out to study the impact of recycled material's replacement levels on the five properties of concrete paving blocks that contain multiple types of recycled materials. Plus, two optimal mix proportions for concrete paving blocks that contain multiple waste materials were obtained, and two batches of concrete paving blocks were cast according to those two mix proportions. A series of static loading tests for a segment of pavement were carried out to study the application performances of those two types of blocks. A finite element analysis model was also carried out to simulate the behaviours of a segment of recycled concrete block pavement and predicted the safety compression of the block pavement. According to the test results, the recommended replacement levels for RCCA was from 0% to 60%, for RCFA was from 0% to 20%, for CG was from 0% to 60%, for GGBS from was 0% to 70%, and the CR was not recommended to use as fine aggregate in concrete paving blocks. For the blocks mixed with RCCA, RCFA, and GGBS, the optimal replacement levels for the three waste materials were 20%, 0% and 30% separately. For the blocks mixed with CG, RCFA, and GGBS, the optimal replacement levels for the three waste materials were 20%, 0% and 30% separately. A series of index equations were deduced to predict and judge properties performances of blocks mixed with multiple waste materials. According to the experimental test results and the numerical analysis results, the two optimal recycled concrete paving blocks were suitable for the practical applications.
Supervisor: Chin, Chee Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.784903  DOI:
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