About Lightweight Concrete, Mortar, Grout and Asphalt (LECA concretes)
Lightweight Concrete, Mortar, Grout and Asphalt (LECA concretes)
Structural or semi-structural Light Weight Concrete (LWC) has been used in usual civil engineering applications as a very convenient alternative to conventional concrete. Structural lightweight concrete made with rotary kiln produced structural lightweight aggregate solves weight and durability problems in buildings and exposed structures. Structural lightweight concrete has strengths comparable to normal weight concrete, yet is typically 25% to 35% lighter. Structural lightweight concrete offers design flexibility and substantial cost savings by providing less dead load, improved seismic structural response, longer spans, better fire ratings, thinner sections, decreased story height, smaller size structural members, less reinforcing steel, and lower foundations costs, also LWC can easily pumping to higher floors. Structural lightweight concrete pre-cast elements have reduced trucking and placement costs.
The excellent durability performance of structural lightweight concrete made with expanded clay structural lightweight aggregate is a result of the ceramic nature of the aggregate, and its exceptional bond to and elastic compatibility with the cementations matrix, (as it is recommended to use leca aggregates in ssd statues). Structural lightweight aggregate's cellular structure provides internal curing through water entrainment which is especially beneficial for high-performance concrete (HPC), (especially in the parts that curing is impossible like inside columns) Internal curing improves the contact zone which mitigates micro cracking.
Concrete using ESCS lightweight aggregate has better thermal properties, higher fire ratings, reduced autogenously shrinkage, excellent freezing and thawing durability, improved contact zone between aggregate and cement matrix, less micro-cracking as a result of better elastic compatibility, more blast resistant, and has better shock and sound absorption, High-Performance lightweight aggregate concrete also has less cracking, improved skid resistance and is readily placed by the concrete pumping method.
LECA mortar can be used like normal mortar for built of block wall or all masonry products with all advantage of LECA, for example one of the best usages of LECA grout or mortar is to protect steel structural elements for fire and corrosion attacking.
LECA aggregate are produced according the ASTM C-330 & C-331 and LECA concrete shall meet guide line of ASTM 211.2 & 318.
The mostly of uses lightweight concrete are as following subjects:
- LECA concrete can be used in different type of slabs in RC frame or deck of steel frame structures, beams or columns as RC ele6ments or as fire protection of steel members
- Post tension slab or beam system, Bridge decks, piers & AASHTO griders
- Specified density concrete, it can be ordered as structural engineer requirement with different density and obviously different compressing strength fc which mix design could be prepared accordingly.
- Lightweight concrete pre-cast & pre-stressed elements (beams, double-tees, tilt-up walls, raised access floor panel planks, hog slats, utility vaults, pipes, ornamentals, etc.)
- LECA concrete or grout can create packages of lightweight, safe and insulating roof and also it allows for creation of slopes for the drainage of rain water and of ballasting of waterproof surfaces.
- Marine structures, floating docks, ships, & offshore oil
- Asphalt pavements (rural, city & freeway)
- Lightweight asphalt bituminous surface treatments, lightweight chip seal, seal coat, etc
02060 - Aggregate
03 - Concrete
03310 - Structural Concrete
03340 - Low Density Concrete
03400 - Precast Concrete
03430 - Site-Precast Structural Concrete
03450 - Plant-Precast Architectural Concrete
03460 - Site-Precast Architectural Concrete
03480 - Precast Concrete Specialties
03520 - Lightweight Concrete Roof Insulation
07050 - Basic Thermal and Moisture Protection Materials and Methods
07200 - Thermal Protection
Categories: LWC, Thermal property, Fire resistance, Sound damping, LWC durability, seismic behavior improvement, specified LWC density, roof and finishing ballasting.