THERMAL PERFORMANCE & FIRE RESISTANCE OF AUTOCLAVED AERATED CONCRETE EXPOSED HUMIDITY CONDITIONS (original) (raw)
Related papers
Properties of Autoclaved Aerated Concrete in Different Curing Conditions: A Review
International Journal for Research in Applied Science & Engineering Technology (IJRASET), 2023
Autoclaved aerated concrete (AAC) has many benefits for structures, such as heat insulation, sound insulation, fire resistance, reduced dead weight, and many more. AAC products include blocks, wall panels, floor and roof panels, and lintels. Besides its insulating capability, one of AAC's advantage in construction is its quick and easy installation since the material can be routed, sanded, and cut to size on-site using standard carbon steel band saws, hand saws, and drills. Although AAC has been produced for many years, there are still some points that need to be clarified. One of these points is the effect of humidity intrusion on AAC members in areas with high relative humidity levels, like Mediterranean climates. Therefore, various tests associated with the mechanical and physical properties of AAC concrete should be carried out, particularly Compressive Strength test in order to assess the strength of AAC blocks. The current project intends to analyse the physical and mechanical properties of autoclaved aerated concrete blocks at three different curing conditions using an accelerated curing tank to compare the effects of curing on the properties of AAC.
The Bulletin of the Polytechnic Institute of Jassy, Construction. Architecture Section, 2013
In the current context, where the climate changes effects are developing continuously, with a permanent intensification, the energy efficiency of buildings became a starting point in current building design. The energy efficiency of a building is directly influenced by the thermal performances of the envelope. Therefore, desingning of envelope elements whose global thermal resistance exceed the required minimum values, is a mandatory measure. Increasing thermal performances of enclosure mansonry walls; it can be made by thermal insulating or by using masonry blocks with low thermal conductivity. In this category of building materials it can be found also autoclaved aerated concrete blocks. The paper presents some experimental determination of thermal conductivity for AAC blocks manufactured in our country. The measurements ware made in the Laboratory of Building Physics within Faculty of Civil Engineering and Building Services from Iasi. Furthermore, the equivalent thermal conductiv...
Review of Autoclaved Aerated Concrete: -Advantages and Disadvantages
Review of Autoclaved Aerated Concrete: - Advantages and Disadvantages, 2018
As the name suggests light weight concrete blocks are light in weight as compared to our convectional concrete blocks. Lightweight concrete is a concrete which includes an foaming agent in it that increases the volume of the mixture while reducing the dead weight.This concrete has its advantages of higher strength for unit weight, better tensile strain carrying capacity, lower coefficient of thermal expansion, and better heat and sound insulation characteristics due to air voids in the concrete. Autoclaved Aerated Concrete block is a present time green building material in India which is used as a substitute over conventional red clay bricks in residential, commercial and industrial construction activities.AAC block is a light weight precast building material that provides construction economy. It is an eco-friendly product, as it is manufactured using 60-65% of fly ash, which is nothing but just an unavoidable waste from coal based thermal power plants. Being bigger in size than clay brick, AAC wall construction involves less joints.It provides us with minimal wear and tear over prolonged use along with minimum maintenance due to weathering. AAC blocks require substantially less of surface treatment.this paper represent reviews on AAC block and its material.
This paper reports field investigation of the hy- grothermal performance of autoclaved aerated concrete blocks (ACC) compared to other wall construction materials. The study was con- ducted under the tropical climatic conditions of Thailand where this debatable issue had not been yet seriously investigated. To this end, three small houses were built. The dimensions of each were 2.4 m x 2.4 m x 2.3 m. Every house was built using a different commercial material namely red clay brick, AAC block and lightweight concrete (LC) block with a plaster- ing layer and no painting in both internal and external sides. The well insulated roof was built with grey colored concrete tiles and gypsum ceiling. The inclination of the roof was 30º to the horizontal plane. Tests were conducted with closed windows and doors. The effect of ambi- ent humidity was simulated by using sprinkles spraying water at the four sides of each house. Experimental observation demonstrated that measured temperatures and hu...
Agro-Industrial Aerated Concrete: Insulation for Thermal Reduction in Building
This paper presents a comparative study aiming in investigate the heat impact for different percentages of Palm Oil Fuel Ash(POFA) for agro-industrial aerated concrete based on their thermal behaviors.In aerated concrete production , aluminum powder is used to create pores which lead to thermal insulation property. Besides that, the bottom ash has being used as sand replacement and performance of POFA replacing binder content at percentages of 0, 10, 20 and 30 by weight has being identify. In order to investigate the thermal performance on the building material, surface temperature sensors, data logging systems together with Infrared thermometric were used respectively. Thermal images will simply rectify the behavior of outdoor surface temperature by having the " heat impact ". The results indicate that 30 per cent of POFA aerated concrete has the better improvement in thermal conductivity and had the capability to absorb and released the heat in shorter time. The study proved that the higher the time lagged hence lower the thermal insulation properties.
Effect of high temperature and cooling conditions on aerated concrete properties
Construction and Building Materials, 2009
In this study, effect of elevated temperatures and various cooling regimes on the properties of aerated concrete is investigated. Air cooled materials are tested at room temperature and in hot condition right after the fire. Water quenching effect is determined by testing the material in wet condition right after the quenching and in dry condition at room temperature. Unstressed strength of the material tested hot is relatively higher than air cooled unstressed residual strength up to 600°C. On the other hand, water quenching decreases the percentage of the strength particularly when the material is wet right after the quenching; strength is lost gradually as the temperature rises. As a result, if the quenching effect is disregarded, temperature rise does not have a considerable effect on the strength of the aerated concrete approximately up to 700-800°C. It is able to maintain its volumetric stability as well. However, more care needs to be taken in terms of its use above 800°C for fire safety.
This type of lightweight concrete has no coarse aggregates in its mixture, and it can be mentioned that aerated lightweight concrete is the concrete mortar which is aerated with gas injection and also can be aerated by using air entraining agent. Aerating concrete by using air entraining agents is more practical in production of LWC. Fine aggregates that can be used to produce aerated concrete are known to be silica sand, quartzite sand, lime and fly ash. Considering methods of curing, aerated concrete can be categorized into two main groups which are autoclaved aerated concrete and non-autoclaved aerated concrete. Curing is an important factor affecting mechanical and physical properties of concretes in different categories. According to different reports, AAC can reach higher strength values with less drying shrinkage when it is compared to non-autoclaved aerated concrete (NAAC). Therefore, it can be concluded that autoclaving process has beneficial effects on strength development and also on shrinkage of aerated concrete. Autoclaved Aerated concrete (AAC) has many benefits for structures such as heat insulation, sound insulation, fire and mould resistance, reduced dead weight and many more. AAC products include blocks, wall panels, floor and roof panels, and lintels. Besides insulating capability, one of AAC's advantages in construction is its quick and easy installation since the material can be routed, sanded and cut to size on site using standard carbon steel band saws, hand saws and drills.
AERATED AUTOCLAVED CONCRETE (AAC) BLOCKS: NOVEL MATERIAL FOR CONSTRUCTION INDUSTRY
Autoclaved Aerated Concrete (AAC) is an ultra-light concrete masonry product. It can weigh as little as 1/5 as much as ordinary concrete due to its distinct cellular structure featuring millions of tiny pockets of trapped air. This cellular structure gives AAC a number of exceptional physical characteristics. AAC consists of basic materials that are widely available. These include sand, cement, lime, fly ash, gypsum, aluminium powder paste, water and an expansion agent. Silica sand, the raw material used in the greatest volume in AAC, is one of the world's most abundant natural resources. The finished product is up to five times the volume of the raw materials used, with an air content of 70% to 80% (depending on the required strength and density.) Due to this large increase in volume, AAC is very resource efficient. The high consumption of raw materials by the construction sector, results in chronic shortage of building materials and the associated environmental damage. In the last decade, construction industry has been conducting various researches on the utilization of easily available raw materials in construction. AAC is one of the materials which can cope up with the shortage of building raw materials and can produce a light weight, energy efficient and environmentally friendly concrete. This study deals with the introduction to the process of the autoclaved aerated concrete and its advantages compared to the normal concrete..
Autoclaved Aerated Concrete: A Revolutionary Material
2016
Autoclaved Aerated Concrete Blocks have many advantages compared to traditional concrete blocks like advanced strength to weight ratio, lower Coefficient of thermal expansion, good sound insulation as a result of air-voids within it. The literature review offers info on the work done on the various properties of AAC and also the results obtained thereby. Finally the cost effectiveness and eco-friendliness like advanced strength to weight ratio, lower Coefficient of thermal expansion, good sound of AAC has been mentioned.