A journalist from the SGGP newspaper interviewed the director of the building materials department of the Ministry of Construction Pham Van Bac on this subject.
Recently, new building materials with cheaper prices have better energy-saving aesthetics and more mineral resources. For example, in the field of building materials, Vietnamese producers have produced and used autoclaved aerated concrete bricks, a product composed mainly of lime, sand or lime and fly ash with a volumetric weight of about half only fired solid bricks of the same grade, has the advantage of thermal properties, can make large slabs to speed up field construction.
Moreover, Vietnam also manufactures hollow concrete wall panels, made by extrusion technology, which are applied in many projects with good economic and technical efficiency.
In the field of glass, domestic enterprises have produced low-emissivity and solar control glass, which can save a lot of energy. As for artificial paving materials, many products that can partially replace natural paving stones are presented on the market.
In the field of cement concrete, super high performance concrete has also been researched and applied in Vietnam with four times the compressive strength of conventional concrete, applied to thin and large-span structures such as beams, bridge decks, irrigation ditches.
Indeed, the production of new types of building materials requires a large investment and the commercialization of new material products can take time. Moreover, the fact that customers are not interested in using new materials is also a hindrance in the business process of companies. Also, the cost of some new materials may be higher, making it difficult to compete with other materials.
Recently, the Ministry of Construction has assigned many scientific tasks to relevant agencies to conduct studies for the production of new materials such as geopolymer bricks, bricks using materials that are industrial waste such as red mud, ash thermal flywheels; super performance concrete; plasterboard from waste from fertilizer factories.
Initially, the products of the research projects showed economic and technical efficiency and promised to be widely applied. In addition, the Ministry of Construction has submitted to the Government and the Prime Minister for promulgation documents aimed at promoting the development of new types of energy-efficient and mineral-resource-efficient construction materials such as Decree 09/ ND-CP relating to to the management of construction materials, Directive 08/CT-TTg relating to the promotion of the use of ash, slag, gypsum.
The use of industrial waste in the production of building materials has helped reduce product costs; therefore, these products will help to reduce the overall cost of the building for the benefit of the construction of social housing projects.
So far, the country has more than 1,600 nonwoven material production facilities, with a total design capacity of more than 10 billion bricks. This result approximately achieves the objective set during the construction of the program.
With the above production, the country has saved about 7.5 million cubic meters of clay, equivalent to 375 ha of land mined at a depth of 2 m per year, as well as reduced consumption of around 750,000 tonnes of coal and reduced emissions to the environment of around 2.85. million tons of CO2.
This proves that Vietnam has made efforts to reduce emissions causing environmental pollution and reduction of agricultural land in our country. Encouraging the investors, the design supervision consultancy units used the unfired brick products in the construction project without being bound by the mandatory provisions of the building contractor’s policies.
However, at present, companies only promote about 40% of the designed capacity, which accounts for more than 25% of the total production of building materials. Responsible agencies should encourage them to use these materials.
In 2022, the Ministry of Construction will request the Prime Minister to promulgate mechanisms and policies to develop the production and use of bricks according to modern technology, to save resources, energy and protect the environment.
In 2023, the Ministry of Construction will request to publish a national program aimed at increasing the use of waste as raw materials and fuels in the production of building materials and in construction. The program aims to use most of the waste from industry and agriculture as raw materials and fuels for the production of building materials.
At the same time, the Ministry of Construction will continue to study more materials. In addition, it will coordinate with functional agencies to promulgate standards for the use of energy in the production of building materials towards specific goals defined in the Vietnam Building Materials Development Strategy. Thus, more new building materials will be produced at lower prices, gradually replacing old building materials.