What is Foam Concrete Used For?
The African Development Bank will finance $25 billion by 2025 to support Africa's fight against climate change, the bank's president said at the bank's annual meeting in Accra, Ghana.
He noted that climate change has had many negative impacts on the continent, causing natural disasters such as droughts, cyclones, and floods. Climate change costs Africa between $7 billion and $15 billion a year. "Africa has no choice but to address climate change."
To ensure Africa's food supply, the African Development Bank has delivered climate-friendly seeds to 12 million farmers in 27 countries in the past two years under the "Technology for Agricultural Change in Africa" program, he said.
In the area of renewable energy, the African Development Bank is implementing a $20 billion "Desert Power" initiative in the Sahel that is expected to power 250 million people, he said.
US President Joe Biden recently wrapped up his five-day trip to Asia with a summit of leaders of the "Quad" security Dialogue.
Biden has promoted a number of economic and security cooperation initiatives during his visit aimed at deepening ties with Indo-Pacific Allies and partners in response to China's growing influence in the region. Some analysts in the United States believe the most significant announcement may be an initiative to share maritime information to combat illegal activities. But other experts say Biden's move sets a good framework for more security cooperation, though it remains to be seen whether concrete action will follow.
Affected by several factors, the supply of the concrete foaming agent is erratic and thus its prices are expected to go higher in the future.
Foam Concrete Properties
Foam concrete is a versatile building material. It is simple to produce and relatively cheap compared with autoclaved aerated concrete. Foam concrete compounds that use fly ash in the slurry mixture are cheaper and have less impact on the environment. The density of foam concrete varies from 200kg/m3 to 1,600kg/m3, depending on the application. Lighter products can be cut to different sizes. Although the product is considered to be a concrete form (with air bubbles instead of aggregate), its high thermal and acoustic quality makes it a distinct application from conventional concrete.
Foam Concrete Advantage
Foam concrete is no less thermally conductive than wood -- 40cm walls can withstand -30° frost.
Foam concrete can withstand exposure to fire on one side for at least 3 hours, with an average of 5 hours.
What is Foam Concrete Used For?
Foam concrete can be produced with dry densities of 400 to 1600kg/m3 (25lb/ft 3 to 100lb/ft 3) and 7-day strengths of approximately 1 to 10N/mm2 (145 to 1450psi) respectively. Foam concrete is fire-resistant and its heat and sound insulation properties make it suitable for a wide range of uses, from insulating floors and roofs to void filling. It is also particularly useful for groove recovery.
Some applications of foam concrete are:
Pipe abandonment/ring filling
Prefabricated wall elements/panels
Insulation compensation laying
Insulating roof mortar
Sunken part filling
A sub-base for the highway
Filling of hollow blocks
Prefabricated insulation board
Foam Concrete Trends and Development
Until the mid-1990s, foam concrete was considered weak, non-durable, and had high shrinkage properties. This is due to the unstable foam bubbles which make foam concrete unsuitable for the production of very low density (less than 300 kg/m 3 dry density) and load-bearing structure applications. It is therefore important to ensure that the air ensnared in the foam concrete is contained in stable, very small, uniform bubbles that remain intact and isolated and do not thus increase the permeability of the cement slurry between the voids.
The development of synthase-based foaming agents, admixtures to enhance foam stability, and specialized foam generation, mixing, and pumping equipment has improved the stability of foam concrete, allowing the production of lightweight concrete with densities as low as 75 kg/ m3 and a density of only 7.5% of water. The enzyme is composed of highly active proteins from biotechnological sources other than proteolysis. In recent years, foam concrete has been widely used in highways, commercial buildings, disaster relief buildings, schools, apartments, and residential development in Germany, The United States, Brazil, Singapore, India, Malaysia, Kuwait, Nigeria, Bangladesh, Botswana, Mexico, and other countries.
Foam concrete has been studied as a bullet trap for high-intensity US firearms training grounds. This work led to the deployment of the product SACON by the U.S. Army Corps of Engineers, which can be transported directly to a metal recovery facility when it wears out, without the need to separate trapped bullets because the calcium carbonate in the concrete acts as a flux.
The energy absorption capacity of foam concrete was approximated by drop tests and was found to vary between 4 and 15 MJ/m 3, depending on its density. The optimum absorption was estimated from a mixture of 1000 kg/m 3 of moderate density at a ratio of water to cement (w/c) 0.6 to 0.7.
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Inflationary pressures on Canadians continue to rise. The consumer-price index rose 6.7% in March from a year earlier, the biggest increase since January 1991, according to the latest figures from Statistics Canada.
On a month-on-month basis, Canada's CPI rose 1.4 percent in March, also accelerating from February's 1.0 percent rise.
Prices in the eight major sectors covered by the statistics continued to rise. The uptrend comes against the backdrop of continued price pressures in the Canadian housing market, widespread supply chain constraints, and geopolitical conflicts, according to CBC. A variety of factors have affected energy, commodity, and agricultural markets. Meanwhile, Canada's employment picture continued to improve in March, with the unemployment rate falling to a record low and the average hourly earnings of employees rising.
Excluding gasoline, Canada's CPI rose 5.5 percent year on year in March. It is also the highest since comparable data began in 1999.
The widespread supply chain constraints and geopolitical conflicts are expected to continue to affect the prices of the concrete foaming agent.