SELF COMPACTING LIGHT CONCRETE WITH LIAPOR AGGREGATES

Research work is aimed on development of Self Compacting Light Concrete (SCLC) with the use of light aggregates “Liapor”. The SCLC is new building material which is combining well known positive properties of light concrete and self compacting concrete. Due to properties, the use of SCLC is very convenient at rehabilitation of old building constructions, where the use of ordinary SCC would lead to overloading and to necessity of additional strengthening of existing structures. Other very favorable use is for production of precast components with very complicated shape with required strength of maximum C25/30. Decisive problems to solve at preparation mix design of this type of concrete are water absorption of Liapor aggregates at atmospheric pressure and also at high pressure during pumping, furthermore, it is evaluation of applicability of conventional mix designing methods for SCC and testing of rheological properties of SCLC. Liapor aggregates are suitable for use in SCLC by reason of spherical shape improving rheological properties of fresh concrete mix. Water absorption of aggregates which has strong influence on rheology in my research has been compensated by adding additional water. Sufficient saturation of aggregates is ensured by thorough mixing of aggregates in water. Disadvantage of Liapor aggregates is low compact strength, by which is lowered compact strength of concrete, for the present time being was maximum attained strength C 25/30 at 1600 kg/m³. Requirements for higher proportion of small aggregates were solved by addition of industrial wastes. This SCLC attained very good rheological and mechanical properties.

• INTRODUCTION

• LIAPOR AGGREGATE

• TERMINOLOGY OF SELF-COMPACTING CONCRETES

• DIFFERENCES IN SCLC DESIGN

• EXPERIMENTAL PHASE

• EVALUATION OF THE TESTS

• CONCLUSIONS

• REFERENCES