Application of Lean Methodology to Improve Sustainability in the Construction and Demolition Waste Industry the Ambisider Case Study Mariana Ribeiro
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Application of lean methodology to improve sustainability in the construction and demolition waste industry The Ambisider case study Mariana Ribeiro MSc Civil Engineering CERIS, CESUR, Instituto Superior Técnico, Universidade de Lisboa Marta Gomes Amílcar Arantes 22 June 2016 1 Application of lean methodology to improve sustainability in the construction and demolition waste industry The Ambisider case study Index . Framework: Research goals . Literature review: Lean and six sigma, lean and green . Case Study: Application of lean tools . Conclusion 2 M1 Lean and Framework Lean Tools Conclusion Green CDW is any debris generated during the construction, renovation and demolition of buildings and civil infrastructures, and their maintenance. CDW Production EU: 500 Mton/year (Coelho & Brito, 2010) 25‐30% Waste Generated Portugal: 7,5 Mton/year (Mália, 2010) 20% CDW Recycling rate EU: 47% Portugal: 5‐10% Denmark, Holland and Belgium: > 70% 3 Slide 3 M1 Marta; 18/06/2016 Lean and Framework Lean Tools Conclusion Green Problems: • High production of waste (CDW) • Reduced recycling rate Needs: Optimization and efficient use of resources General waste • Prevention and reduction of waste production management regime • Efficient use of natural resources DL n 73/2011 Achieve sustainability in the Construction Industry Incorporation of recycled aggregates in construction is highly relevant to achieve sustainability and reduce the negative impact of climate changes 4 Lean and Framework Lean Tools Conclusion Green Problems: • High production of waste (CDW) • Reduced recycling rate Needs: Optimization and efficient use of resources • Prevention and reduction of waste production • Efficient use of natural resources Achieve sustainability in the Construction Industry Portugal 2020 Program 70% CDW recovery in 2020 Improve CDW recycling processes by adopting the lean management philosophy 5 Lean and Framework Lean Tools Conclusion Green Origin 1950 Toyota production system: Lean Production – Lean thinking Lean Purpose: Eliminate waste ‐ Generate flow ‐ Create value ‐ Reduce costs ‐ Improve quality – Increase competitiveness Lean principles Six Sigma (DMAIC) 1.Identify value Define Lean Six 2.Map the value stream Measure Sigma 3. Create flow Analyze (LSS) 4. Establish pull Improve 5. Seek perfect Control Salah et al. 2010 6 Lean and Framework Lean Tools Conclusion Green Lean and Green ‐ Lean studies are based mainly in the Automotive industry; ‐ Lean applications are expanding: Lean Construction and Lean Service; ‐ No studies were found related to Lean practices applied to the CDW treatment process; ‐ Some authors emphasize there is a positive relationship between Lean practices and environmental performance (Green). Green goals Lean Principles Achieve sustainability 7 Lean and Case Study Framework Conclusion Green Lean Tools Objective: Present a proposal for improving the production process of recycled concrete aggregates of Ambisider by applying the DMAIC method based on LSS management philosophy. 8 Lean and Case Study Framework Conclusion Green Lean Tools CDW treatment process of Ambisider Concrete (EWL 17 01 01) and mixtures (EWL 17 01 07) EWL: European Waste List CRU: Concrete Recycling Unit TRSA: Temporary Residues Storage Area 9 TBA: Tagus Bay Area Lean and Case Study Framework Conclusion Green Lean Tools Ambisider main facility layout Ambisider data (2013) • Waste valorization rate ‐ 97% • Recycling rate ‐ 91% 81% inert material 20% of the business volume Extra activity: commercialization of recycled aggregates of concrete and mixtures Not competitive Shortcomings in the recycled aggregates productive process 10 Lean and Case Study Framework Conclusion Green Lean Tools Methodology 1. Preliminary stage (action “go and see”) 2. DMAIC method 11 Lean and Case Study Framework Conclusion Green Lean Tools 1) Define: Define the problem and project goals Tools: SIPOC; VOC; VOE; CTQ Tree and Project Charter SIPOC 12 Lean and Case Study Framework Conclusion Green Lean Tools 1) Define: Define the problem and project goals VOC (Voice of Costumer) and VOE (Voice of Employee) Critical to Quality Tree VOC VOE 13 Lean and Case Study Framework Conclusion Green Lean Tools 2) Measure: measure process performance and establish metrics Tools: 1. Spaghetti diagram – Understand materials flow 2. Value Stream Mapping (VSM) – Understand materials and information flow 3. Define Key performance indicators (KPI) 14 Lean and Case Study Framework Conclusion Green Lean Tools Current state VSM Hour/ton Lead time = 22days 528 0.0250 0.0055 0.0027 Value added time 0.0125 0.0250 0.0200 0.0170 = 4,47 min 15 Lean and Case Study Framework Conclusion Green Lean Tools 2) Measure: measure process performance and establish metrics Problems Key Performance Indicators (KPI) 1. Waiting time of CDW to be recycled • Lead time (days/ton) 2. Reduced quality of aggregates; • Value added time (%) • CDW Stock (ton) 3. Crusher breakdowns • Production capacity (ton/hour) 4. Occasional realization of sieving • CDW quality (according to LNEC parameters) 16 Lean and Case Study Framework Conclusion Green Lean Tools 3) Analyze: identify potential root causes for the problems 1. Brainstorming ‐ High CDW waiting time for recycling operations 1. No control of CDW recycling operations by the contractor/project owner after the residues leave the 4. Frequent equipment demolition site. breakdowns. 2. Manual sorting and 5. Limited number of primary smashing at Waiting time customers for the recycled Ambisider aggregates. 3. Reduced number of 6. No deadline for completing specialized operators to handle the recycling process. the crusher. 17 Lean and Case Study Framework Conclusion Green Lean Tools 3) Analyze: identify potential root causes for the problems 2. Cause and effect diagram to analyze crusher breakdowns Mão de Material Máquina obra Elevado nº de Ausência de Uso horas de Ausência de conhecimentos inadequado funcionamento ferramentas para a Ausência de e peças Avarias manutenção padronização corretiva do Plano de Intempéri Contenção de britador manutenção es despesas ineficaz Método Meio Medidas ambiente 18 Lean and Case Study Framework Conclusion Green Lean Tools 3) Analyze: identify potential root causes for the problems 3. Five whys (5W) technique for the occasional realization of sieving operations Problem: Occasional realization of sieving From the standpoint of Ambisider sieving operations mean more human resources 1W available, unnecessary time and cost, adding no value to the company or the main costumer. From the main costumers point of view From the potential costumers point of view (demolition/deconstruction costumers) (recycled aggregates costumers) 2W (...) 2W (...) According to the Portuguese law it is 3W (...) only required the reduction of the waste dimensions. Thus, only sorting, primary 4W (...) 3W reduction and crushing procedures are There are defects in the selective demolition mandatory while the grain size 5W differentiation is not. and in the recycling process. 19 Lean and Case Study Framework Conclusion Green Lean Tools 3) Analyze: identify potential root causes for the problems 4. Cause and effect diagram to analyze reduced quality of recycled aggregates Diagrama Causa‐Efeito 20 Lean and Case Study Framework Conclusion Green Lean Tools 4) Improve: Eliminate wastes and seek for Lean principles Cultural changes: integrated vision of the production process + Quality ‐Waiting time ‐Breakdowns Inclusion of sieving More effectiveness during all CDW treatment steps; Laboratory tests – partnerships with Universities Follow LNEC specifications; Improvements Identify value (recycled aggregates costumers perspective); Standardize work; Continuous training events; Regular intern 5S audit (sort, straighten, shine, standardize and sustain) 21 Lean and Case Study Framework Conclusion Green Lean Tools Future State VSM Lead time = 1,7days 40 0.0125 0.0055 0.0027 Value added time 0.0063 22 H/ton 0.0125 0.0200 0.0170 = 3,35 min Lean and Case Study Framework Conclusion Green Lean Tools 5) Control: Sustain the gains 5S Audit Area Audited Sort Straighten Shine 0‐4 Scores Standardize Sustain 5S category Rating Criteria 23 Lean and Case Study Framework Conclusion Green Lean Tools 5) Control: Sustain the gains Checklists for crusher maintenance Daily maintenance Standard* Checklist Weekly maintenance Standard* * Manual Crusher 24 Lean and Case Study Framework Conclusion Green Lean Tools 5) Control: Sustain the gains Visual Control – Informative Board 25 Lean and Case Study Framework Conclusion Green Lean Tools Conclusion Main suggestions for improvement Main expected results • Company cultural changes; Pull System • Standardize work; Create production flow • 5S; Increase production capacity • Training events; Lead time reduction (92%) • Universities partnerships. Better recycled aggregates quality Increase of company’s competitiveness Positive impact in green goals 26 Lean and Case Study Framework Conclusion Green Lean Tools Shortcomings Difficulties analyzing the production process Lack of data regarding the CDW treatment process Contributions DMAIC method enabled to understand the problems, find their root causes and design suitable improvements Expansion of Lean applications (construction and demolition industry) Future developments Deeper understanding of the process Implementation of proposed improvements 27 Thank you Mariana Ribeiro [email protected] Where there is no Standard there can be no Kaizen ‐ Taiichi Ohno 28.