Page 10 - New Trends in Eco efficient and Recycled Concrete

Contents ix

8.3 Mollusc shell as aggregate for concrete 194
8.3.1 Recycling treatment of mollusc shells 194
8.3.2 Experiences in the use of mollusc shells as aggregates 194
8.4 Effect of mollusc shell in concrete properties 197
8.4.1 Hardened density 197
8.4.2 Fresh state 198
8.4.3 Compressive strength 199
8.4.4 Tensile strength 201
8.4.5 Concrete microstructure 201
8.5 Concluding remarks 203
References 204
9 Life cycle assessment applied to recycled aggregate concrete 207
Desire ´e Rodrı ´ guez-Robles, Philip Van den Heede and Nele De Belie
9.1 Introduction 207
9.2 Ecological background of the concrete sector 208
9.2.1 Environmental impacts 208
9.2.2 Concrete sustainability through recycled aggregates 219
9.3 Life cycle assessment: considerations for recycled aggregate
concrete 225
9.3.1 Goal and scope 226
9.3.2 Inventory analysis 233
9.3.3 Impact analysis 233
9.3.4 Interpretation 234
9.4 Conclusions 238
References 244
10 Comparative studies of the life cycle analysis between
conventional and recycled aggregate concrete 257
Sneˇ zana Marinkovi´ c and Vedran Carevi´ c
10.1 Introduction 257
10.2 State-of-the-art 258
10.3 Modelling in comparative LCA of concrete 258
10.3.1 Selection of the functional unit 258
10.3.2 System boundaries: attributional versus consequential
modelling 259
10.3.3 Influence of CO 2 uptake during primary and
secondary life of concrete structures 261
10.4 Case study: reinforced concrete floor slab in residential
building made of conventional and recycled aggregate concrete 266
10.4.1 Design 267
10.4.2 LCA model 274
10.4.3 Life cycle impact assessment 278