Properties of Fresh Concrete: Proceedings of the International RILEM Colloquium (RILEM Proceedings 10)

Book Cover......Page 1
Half-Title......Page 2
Title......Page 4
Copyright......Page 5
Contents......Page 6
Preface......Page 9
PART ONE GENERAL PROPERTIES OF FRESH CONCRETE, MORTAR AND CEMENT......Page 11
1 Introduction......Page 12
2.2 Effect of mixing and handling......Page 13
3.1 Reproducibility......Page 14
3.4 Plug flow......Page 15
4 Microstructural interpretation......Page 16
6 References......Page 17
2 Concrete Composition......Page 19
4.1 Obtained Experimental Data......Page 20
4.2 Discussion......Page 23
5 References......Page 24
1 Introduction......Page 25
2 Investigations......Page 26
3.1 Initial consistency of fresh concrete......Page 27
3.2 Stiffening of fresh concrete......Page 28
4 References......Page 29
1 Introduction......Page 31
2.1 Current methods......Page 32
3 Laboratory tests......Page 33
4 Practice tests......Page 36
6 References......Page 37
1.1 General......Page 39
2 Investigations on influencing factors......Page 40
3.2 Influence of type and amount of calcium sulphate......Page 42
4 References......Page 44
PART TWO FACTORS INFLUENCING THE PROPERTIES OF FRESH CONCRETE......Page 47
1 Introduction......Page 48
2 Research programme and results......Page 49
Reference......Page 52
1 Introduction......Page 53
2 Demands imposed on drilling cements......Page 54
3.1 Improvement in cementation technique......Page 56
3.2 Adaptation of the cement slurry formulation to match the borehole conditions......Page 58
4 References......Page 59
1 Introduction......Page 61
3 Correlation Analysis......Page 63
4 Results......Page 64
7 References......Page 67
1 Introduction......Page 68
3.2 Paste volume calculations......Page 69
5.1 Effect of aggregate void condition......Page 70
5.2 Effect of size of the aggregate fraction......Page 72
5.3 Overall effect of particle size......Page 74
5.4 Aggregate and cement water requirements......Page 75
7 References......Page 77
2.1 Materials......Page 78
2.3 Manufacturing and workability tests......Page 79
4 References......Page 80
1 Introduction......Page 86
3 Effect of Retempering on Compressive Strength......Page 87
4 Effect of Delay of Casting......Page 89
5 Water Demand......Page 90
7 Conclusions......Page 91
References......Page 93
1 Introduction......Page 94
2 Mechanism of slump loss......Page 95
3 Delayed dosage of superplasticizer......Page 96
4 Repeated dosage of superplasticizer......Page 98
5 References......Page 99
1 Introduction......Page 101
4 Formulas for water requirement......Page 102
5 Extension of the limits of validity......Page 103
6 Further improvement of the formulas......Page 105
References......Page 106
2.1 Method of testing......Page 107
2.2 Test results......Page 108
3.1 Retempering by additon of plasticizer......Page 109
3.2 Prolongation of workability of fresh concrete by addition of setting retarders......Page 111
9 References......Page 112
2 Cements......Page 113
3.1 Type and amount of calcium sulphate in cement......Page 114
3.2 Cement composition......Page 115
3.3 Working temperature......Page 118
4 Influences on stiffening......Page 119
6 References......Page 121
1 Introduction......Page 123
3 Role of fly ash and slag......Page 124
4 Principles for incorporating fly ash/slag......Page 125
5.2 Strength development......Page 126
5.3 Elastic modulus......Page 127
7 References......Page 129
1 Introduction......Page 131
2.1 Causes of slump loss......Page 132
3.2 Site retempering at low temperatures......Page 133
3.3 Laboratory retempering at high temperatures......Page 135
4 Conclusions......Page 136
5 References......Page 137
PART THREE TEST METHODS: SIGNIFICANCE AND RELIABILITY......Page 138
1 Introduction......Page 139
2.1 Design of a Coaxial cylinders viscometer......Page 140
2.2 The Brabender ViscoCorder......Page 141
2.3 Rheology of mortar......Page 142
3.2 Mixes and their preparation and testing......Page 143
4.2 Results......Page 144
5 Discussion......Page 145
8 Acknowledgement......Page 146
1 Introduction......Page 147
2.1.1 Testing procedures......Page 148
2.1.2 Results......Page 149
2.2.1 Mix design......Page 150
2.2.2 Testing procedures......Page 151
2.3 Results......Page 152
3.1 Comparison of water segregation of cement and concrete......Page 153
3.4 Water segregation and fineness......Page 154
4 Conclusions......Page 155
5 References......Page 156
2 Field observations and laboratory tests......Page 158
4 Test results......Page 159
4.7 Category 3–4......Page 160
5 Correspondence between observations on job sites and bleeding water quantities......Page 161
6 Conclusions......Page 162
7 Appendix A......Page 163
8 Appendix B......Page 165
1 Introduction......Page 171
2.1 Intensive Compaction test......Page 172
3.1 Proportioning......Page 173
4 Results......Page 175
5.2 Test results......Page 176
6 References......Page 177
2.1 Method and equipment......Page 179
3.1 Technique......Page 180
3.2 Results......Page 182
6 References......Page 185
1 Introduction......Page 187
2 The “Classical” Case......Page 188
4 Selected Test Methods......Page 189
5 Conclusions......Page 191
References......Page 192
Development of the Apparatus......Page 194
Practical Processes......Page 196
Quality Control......Page 197
References......Page 198
1 INTRODUCTION......Page 201
2.2 Design considerations......Page 202
2.3 Description of apparatus......Page 203
2.4 Testing procedure......Page 205
3.2 Correlation with the two-point workability apparatus......Page 206
3.3 Reproducibility......Page 207
4 CONCLUDING REMARKS......Page 208
REFERENCES......Page 209
PART FOUR INTERACTIONS BETWEEN PROPERTIES OF FRESH CONCRETE AND HARDENED CONCRETE......Page 211
1 Introduction......Page 212
2 Materials and mixes......Page 213
4.1 Consistency tests......Page 214
4.2 Unit weight......Page 215
4.5 Setting times......Page 216
5 Conclusions......Page 217
Acknowledgements......Page 218
2 Experimental work......Page 220
3 Results......Page 221
6 Referances......Page 223
1 Introduction......Page 226
2 Abrams’ Law......Page 228
4 Generalization of Abrams’ Law......Page 230
6 References......Page 233
1 INTRODUCTION......Page 235
2.1 Tensile anisotropy of concrete in specimens, full-scale model structures and actual structures......Page 236
2.2 Causes of anisotropy and affecting factors......Page 237
3.2 Variations in concrete qualities in a model wall......Page 239
5 CHARACTERIZATION BY TENSILE TESTING......Page 240
7 CONCLUSIONS......Page 241
References......Page 242
PART FIVE COMPUTER AIDED MIX DESIGN AND PRODUCTION......Page 243
1 Introduction......Page 244
3 Les interactions mécaniques entre pâte et granulats......Page 245
3.1 L’effet de masse des granulats......Page 246
3.2 Les actions intergranulaires......Page 247
4 Conclusions......Page 248
Références......Page 249
2 Scope of research......Page 251
4 Conclusions......Page 252
5 References......Page 253
1 Introduction......Page 257
2 Principles of the work......Page 258
3.2 Bertta......Page 259
3.4 Vibrating compacting......Page 260
4.2 Bertta......Page 261
4.3 Two point test......Page 262
6 References......Page 263
1 Introduction......Page 265
2 Rheological properties of cement pastes......Page 266
3 Concrete mixture parameters......Page 267
5 References......Page 269
2 Rheological Aspects......Page 271
3.1 Computer Aided Manufacturing......Page 273
3.2 Measurment of the Water Content of Aggregates......Page 274
3.3 Measurement of Consistency in the Mixer......Page 275
4 Conclusions......Page 276
6 Literature......Page 277
1 Introduction......Page 278
3.1 Slump test......Page 279
3.2 Flow test......Page 281
3.3 Vibrating test......Page 282
3.4 Cylindrical rotation viscometer......Page 283
4 Simple estimation method of rheological constants......Page 285
5 Conclusion......Page 286
References......Page 287
1 Introduction......Page 288
2.4 Coarse aggregate and mix proportions......Page 289
3.1 Casting to model form......Page 291
3.2 Two-dimensional slump test......Page 292
3.5 Box test on vibration table......Page 293
3.6 Casting to form of RC beam......Page 294
References......Page 295
37 USE OF COMPUTER CONTROL SYSTEMS FOR CONSISTENT QUALITY IN GREEN CONCRETE......Page 300
INDEX......Page 302