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Similar to many cosmopolitan cities in the world, the high density buildings and roads in Hong Kong generate great environmental burden. For instance, air conditioning inside buildings accounts for one-third of the total local electricity consumption. Meanwhile, more than 600 roads in the region are generating high noise level of over 70dB, not to mention the neighborhood noise that also causes disturbance. Recent development of green and energy efficient building materials has shed light on tackling these environmental issues.
NAMI has identified opportunities for smart and sustainable building materials in four major focus categories - energy saving materials, waste recycling, maintenance, and noise reduction where NAMI has been endeavoring the corresponding core competences to meet the imminent needs of Hong Kong.

Here are some examples of the ready-to-market technologies:

  • Development and commercialization of superior thermal insulating foamed concrete and VOC-free cement-based coating for energy-saving buildings.
  • Alkaline activated cement with significant CO2 reduction for rapid set applications.
  • PET recycling for buildings for water seepage related repairing application and green sustainable lightweight aggregates based on incinerated wastes.
  • Maintenance technologies by using fabric reinforced cementitious material for buildings retrofitting, nano-particles reinforced polymer-cementitious coating with enhancement on elongation-at-break with waterproofing features, UV resisting polymeric coating for floor, etc.
  • Cost-effective concrete as floor underlayment in reducing impact sound level and sound barrier in roads.
Foamed Concrete Material
NAMI has developed an award-winning foam forming technology in cementitious concrete which yields an excellent thermal insulation, 3 times better than that of common concrete, with a 5°C temperature reduction. In addition, this porous-based concrete material is favorable to sound diffusion and contributes to sound insulation when being applied in the construction of roads, pavements and walls of buildings. NAMI's foamed concrete technology has received the Hong Kong Green Innovations Award (Certificate of Merits) in 2014.

NAMI has been actively developing next generation nanotechnology-based foaming agent technology which is targeted not only for concrete but also for other building materials, and even landfill odor-stopping layer.

Resources Recycling
Resources recycling is one of the key approaches for a city to save land and energy, and at the same time inspire emerging business opportunities. NAMI has been actively developing Ground Granulated Blast-furnace Slag–based alkaline activated cement (AAC) as next-generation construction materials to substitute conventional Ordinary Portland Cement (OPC) which is accounting for 5% CO2 annual emission. NAMI's AAC can achieve high strength, rapid set with superior corrosion resistance, which will be very attractive for rapid repair, corrosion resistance protective layer and even high performance concrete.
Fire Resistant High-Performance Concrete with Hybrid Fibre Reinforcement and Nanomaterials
In view of significant spalling of conventional high strength concrete (HSC), NAMI has developed a Fire Resistant High Strength Concrete (FRHSC). Through the selection of various raw materials such as fly ash, silica fume, and hybrid fibers, compressive strength of FRHSC can reach between 100MPa – 150MPa.

NAMI’s FRHSC can be applied in different scenarios including steel-concrete composite structure for Modular integrated Construction (MiC).