Autoclaved Aerated Concrete Research Articles

Experimental Investigation on Flexural Performance of Masonry Wallettes Strengthened with Cementitious Matrix Grid

A large experimental study was conducted at IIT Patna, India to evaluate the effectiveness of different types of cementitious matrix grids (CMGs) in improving the flexural performance of unreinforced masonry specimens. Four types of masonry wallettes: brick-lime mortar, brick-cement mortar, brick-mud mortar and autoclaved aerated concrete (AAC) block masonry were prepared in the laboratory. In this study, eleven different CMG comprising of glass fabric and steel wire meshes embedded in the five different grades of cementitious matrix were used to strengthen the masonry assemblages. The aim of this study is to understand the role of various parameters such as tensile strength of CMG, compressive strength of masonry and cementitious matrix in influencing the efficiency of the strengthening scheme. In total 130 specimens with failure plane-parallel and perpendicular to the bed joint were prepared and tested under quasi-static displacement control loading. Considering the ease of installation, the fabric was directly placed on the masonry wallette using mechanical anchors and then covered with a thick layer of cementitious matrix.Test results highlights that all strengthening schemes are effective and can significantly enhance the flexural moment capacity in the range of 2.5 - 63.0 times the flexural moment of the respective control specimens. These strengthening schemes effectively mitigate the brittle behaviour of masonry wallettes and improved the deformation capacity by 1.2 - 18.1 times when compared to the respective control specimens. The study also illustrated that the strength of cementitious matrix can play an important role in contributing to the strength and deformability of the masonry specimens strengthened with CMG. For low strength cementitious matrix, debonding failure was commonly observed, whereas, for high strength cementitious matrix, the failure/rupture of reinforcement was noticed. In addition, the shear failure of masonry or debonding failure of reinforcing mesh was observed for specimens in which CMG had higher percentage of reinforcement.

Autoclaved aerated concrete (AAC) shear and tensile bond strengths with various mortar formulations and thicknesses.

For masonry walls, autoclaved aerated concrete (AAC) blocks are widely utilised. Compression and tension bonding must constantly be calculated for various mortar mixtures to evaluate the strengths of the AAC block-mortar contact a mortar with a polymer modification and conventional cement sand mortar (1:5 or 1:7) with a thickness of 12mm, 17mm, or 22mm are examined for binding strength on an AAC block mortar interface. Before pouring the cement sand mortar into the brickworks, On the block surface, a thin cement slurry covering was placed. A three-fold analysis was used to estimate the shear bond strength for all types of interfaces, while a cross-couples test was used to evaluate the tensile bond strength.The modified polymer mortar (PMM) had a shear bond strength of 0.15 MPa, with block failure of the vigorous failure type, whereas the cement sand mortar had the greatest shear bond strength of 0.14 MPa, with a cement-sand mortar ratio of 1:5 and a thickness of 17 mm. Since the tensile bond strength of all test specimens utilised in this study was evaluated, PMM had the greatest tensile bond strength of 0.22 MPa. Based on observed failure patterns and the strength of the tensile and shear bond of AAC mats, a 1:5 ratio cement sand or modified polymer mortar with a thickness of 17 mm can be selected from all possibilities for AAC brickwork.

Experimental Investigation of Bond strength Autoclaved Aerated Concrete (AAC) Masonry

Masonry walls can be load-supporting as well as non-supporting in which AAC blocks are utilized. Binding tenacity of autoclaved aerated concrete block-mortar interfaces formed of standard cement-sand mortars of various formulas and polymer-modified mortars is investigated in this study.It is presented a method for increasingnormal sand-cement mortar's binding strength without modifying the block surface qualities. Following the application of a thin cement-slurry coating to the block surfaces, a thick sand and cement mortar is poured. A triplet test was used to establish the brickwork's shear bond persistence, while a cross-couplet test was used to determine the tensile bond strength. Bond strength test’s failure patterns were investigated. The costs of AAC walls with various types of interfaces were then calculated.

Waste Originating from the Cleaning of Flue Gases from the Combustion of Industrial Wastes as a Lime Partial Replacement in Autoclaved Aerated Concrete

This paper aims to study the suitability of partial replacement of lime by waste originating from the cleaning of flue gases from the combustion of industrial wastes in the production of autoclaved aerated concrete (AAC). The compressive strength, bulk density, pore structure, phase composition, and microstructure of hydration products of the AAC were analyzed. According to the results, the addition of the waste can effectively enhance the mechanical properties of AAC due to the differences in morphology of hydration product—1.1 nm tobermorite and related dense microstructure. The pore size distribution was significantly influenced by waste addition, which was one of the main reasons for the increase in thermal conductivity. The XRD and SEM results showed that foreign ions introduced with the wastes affect the synthesis of 1.1 nm tobermorite. Moreover, it was shown that waste containing a high content of CaO can be used as lime replacement, which allows reducing CO2 emissions during the AAC production process.

Environmental aspects of the production and use of autoclaved aerated concrete with low density

The purpose of the article is to investigate the state of carbon dioxide emissions generated as a result of wall materials production and the construction industry as a whole. The paper provides a comparative analysis of housing construction in Ukraine and in some CIS countries. Against the background of the indicators of low housing availability and low relative volumes of housing construction, the issue of high energy consumption remains valid. The absolute and relative volumes of greenhouse gas emissions from economic activity of the population of Ukraine are given. The projected consequences for Ukraine from continued CO2 emissions on the same level and temperature rise are estimated. It is deemed that the most suitable wall material for countries with emerging economies is autoclaved aerated concrete (AAC); since it is a structural and thermal insulating material, it can solve the problem of housing construction.
 The paper shows the key priority of low energy consumption and makes emphasis on lowering the density of the produced aerated concrete, reducing mineral additives and cement production expenses.

Environmental perspectives of fine grounded concrete powder: LCA case study of light-weight concrete block

The construction elements produced with low demand for primary resources are being developed in the building industry. However, not only consumption of primary resources but also environmental impacts of such products should be considered to increase the sustainability of the construction industry. To investigate the environmental impacts of lightweight concrete blocks, life cycle assessment (LCA) was used as an analytical tool according to the EN 15 804 + A2. Firstly, the properties of fine grounded concrete powder (FRWC) were measured to declare functionality and potential to use of the considered product. Then, the lightweight concrete block containing FRWC was designed. The potential environmental impacts of the lightweight concrete block were assessed for the following phases: raw material production, transport of materials, production of concrete block, and end of life of the block. The considered system boundaries includes the production of fine grounded concrete powder, which was produced by recycling demolished concrete structures. The results were related to 1 tun of lightweight concrete block. Unsurprisingly, the calculated impact is mainly influenced by cement production. The total impact of the life cycle of 1 t of the lightweight block is 336 kg CO2 eq. On the other hand, the lightweight block reached better results in the comparison with the Aerated Autoclaved Concrete block in most of the categories.

Utilization of red mud with high radiation for preparation of autoclaved aerated concrete (AAC): Performances and microstructural analysis

Millions of tons of red mud need to be disposed of in China, which caused environmental pollution. This study utilized red mud with high radiation to replace fly ash (up to 30%) to prepare autoclaved aerated concrete (AAC), and their durabilities, pore structures and microstructures were investigated correspondingly. The results indicate that the introduction of red mud led to a more viscous AAC slurry as well as the inferior post-freezing strength, which could be explained by the pores' interconnectivity and shapes. However, red mud could lead to the formation of a higher amount of tobermorite and reduce the pore size so that drying shrinkage of red mud-based AAC could be alleviated. Overall, the utilization of red mud in AAC could be an effective way to dispose of red mud in terms of intrinsic radiation reduction, facilitating its valorization and application on a large scale in practice.

Parameter estimation of a homogeneous macromodel of masonry wall made of autoclaved aerated concrete based on standard tests

Computer analysis of complex masonry structures requires the use of an appropriate homogenization approach. The size of the structure and the required degree of calculations' accuracy determine the technique's selection. Popular homogenization methods make it difficult to replicate the analyzes by other researchers. The difficulty is calibrating the parameters entered into the numerical model, often determined on proprietary research stands. This paper presents the author's method of empirical homogenization of masonry made of autoclaved aerated concrete (AAC). The method is dedicated to the analysis of new wall structures made of autoclaved aerated concrete. The mechanical parameters of the masonry were determined experimentally following generally applicable standards. Correlations between the compression or diagonal shear tests and computational calculations were determined. A nonlinear elastic–plastic model with the degradation with a combination of Rankine and Menetrey-Willam surfaces was employed. Validations were carried out based on the size of cracking and destructive stresses and the scratching patterns. This approach eliminates the problem of experimental repeatability and correlates the empirical parameters ​​derived from standard tests with the computational ones.

Experimental and numerical investigation of polymer-reinforced and normal autoclaved aerated concrete masonry walls under large TNT explosive loads

With features such as a low mass ratio and good heat insulation and energy absorption properties, autoclaved aerated concrete (AAC) is extensively used as a filling material for building structures. To study the failure behaviour of AAC masonry walls under explosive loads, four full-size wall specimens divided into two groups were established in a field test field: two normal masonry walls (as references), a masonry wall coated with polymer only on the back, and a masonry wall coated with polymer on both sides, where all the polymer coatings were 4 mm in thickness. The two groups of walls were each subjected to explosion tests comprising 3,000 kg and 10,000 kg of TNT. The test results demonstrated the ultimate failure patterns of the masonry walls. In addition, overpressure sensors equipped with an independently developed remote data acquisition system were used to plot the incident and reflected overpressure curves at distances of 70 m and 100 m from the two high-charge TNT explosions. The differences between the arrival times, peaks and impulses (both incident and reflected) of the tested shock waves and the CONWEP predictions were compared. Then, based on the failure patterns of the specimens, post-explosion damage assessment criteria of AAC walls were preliminarily established. The assessment results indicated that the polymer coating on the wall surface remarkably improved the blast resistance performance of the masonry walls. Finally, the cohesive zone method (CZM) was introduced to simulate the blast resistance of building structures. According to the results of a comparative analysis and simulation, the CZM model can effectively reflect the explosion responses and ultimate failure patterns of masonry walls.

In-plane cyclic tests on strengthening of full-scale autoclaved aerated concrete blocks infilled RC frames using highly ductile concrete (HDC)

Conventional infill walls commonly have low deformability and high damage characteristics under strong seismic loading, which is significantly affect the ductility of reinforced concrete (RC) frames. This study aims to investigate the deformability of autoclaved aerated concrete (AAC) infill walls strengthened with highly ductile concrete (HDC) layers in RC frames. Four full-scale specimens, namely, one bare frame, one AAC infilled frame strengthened with plaster (as a conventional method), and two AAC infilled frames strengthened with HDC layers (with and without horizontal seams), were tested under in-plane quasi-static cyclic loading. The test results in terms of failure pattern, hysteretic behavior, deformation capacity, stiffness degradation, and energy dissipation are presented and discussed. The results indicated that the HDC layer could significantly enhance the deformation and energy dissipation capacities of the AAC infilled frame and maintain the integrity of infill walls at high drift levels. Furthermore, the ultimate displacement of the AAC infilled frame strengthened with the HDC layer divided by horizontal seams was 8.85 times as large as that of the specimen strengthened with plaster. Based on the results, empirical formulas for predicting the lateral strengths of the strengthened infill wall frame were established. The predicted values are consistent with the test results. Further experimental research is required to verify the reliability of the formulas.

Effect of polypropylene fiber length on mechanical and thermal properties of autoclaved aerated concrete

In this experimental study, the effect of polypropylene fiber (PF) length on the thermal conductivity, pressure and flexural strength values ​​of autoclaved aerated concrete (AAC) was investigated. The investigation used samples from G2/04, G3/05, and G4/06 classes AAC manufacturing in three different density and compressive strength groups. PF of three different lengths, 3, 6, and 12 mm, were chosen as reinforcement material, and AAC samples were made by adding 1.0% in the same volumetric ratios into the matrix material, taking into consideration their specific gravity. After the samples were kept in curing at 60 °C for 4 h, they were cured in an autoclave at 180 °C at 11 bar pressure for 7 h. After the autoclave process was completed, the flexural and compressive strength, thermal conductivity values of the samples were tested and the internal structure images were examined with a scanning electron microscope (SEM). It was observed that the flexural and compressive strengths of the samples increased with PF reinforcement in all density groups, while the thermal resistances decreased and the fiber length (for 3, 6 and 12 mm) had a positive effect on the compressive and flexural strengths of all examined AAC classes. It was obtained by 70.4% increase in the compressive and flexural strengths of G2/04 class of AAC samples with 12 mm length PF addition. As the PF length increases, the thermal conductivity values ​​of all samples also increase and the highest thermal conductivity increase was observed in the G5/06 class samples with a value of 20.2%. In general, it was observed that the compressive strength, bending strength and thermal conductivity values ​​of all samples increased depending on the increase in PF length. It has been observed that thermal conductivity values are worsen at more higher rates while the strength values of AAC at all fiber lengths is improves with PF additive.

Finite element analysis of lightweight concrete-filled LSF walls exposed to realistic design fire

PurposeLight-Gauge Steel Frame (LSF) structures are popular in building construction due to their lightweight, easy erecting and constructability characteristics. However, due to steel lipped channel sections negative fire performance, cavity insulation materials are utilized in the LSF configuration to enhance its fire performance. The applicability of lightweight concrete filling as cavity insulation in LSF and its effect on the fire performance of LSF are investigated under realistic design fire exposure, and results are compared with standard fire exposure.Design/methodology/approachA Finite Element model (FEM) was developed to simulate the fire performance of Light Gauge Steel Frame (LSF) walls exposed to realistic design fires. The model was developed utilising Abaqus subroutine to incorporate temperature-dependent properties of the material based on the heating and cooling phases of the realistic design fire temperature. The developed model was validated with the available experimental results and incorporated into a parametric study to evaluate the fire performance of conventional LSF walls compared to LSF walls with lightweight concrete filling under standard and realistic fire exposures.FindingsNovel FEM was developed incorporating temperature and phase (heating and cooling) dependent material properties in simulating the fire performance of structures exposed to realistic design fires. The validated FEM was utilised in the parametric study, and results exhibited that the LSF walls with lightweight concrete have shown better fire performance under insulation and load-bearing criteria in Eurocode parametric fire exposure. Foamed Concrete (FC) of 1,000 kg/m3 density showed best fire performance among lightweight concrete filling, followed by FC of 650 kg/m3 and Autoclaved Aerated Concrete (AAC) 600 kg/m3.Research limitations/implicationsThe developed FEM is capable of investigating the insulation and load-bearing fire ratings of LSF walls. However, with the availability of the elevated temperature mechanical properties of the LSF wall, materials developed model could be further extended to simulate the complete fire behaviour.Practical implicationsLSF structures are popular in building construction due to their lightweight, easy erecting and constructability characteristics. However, due to steel-lipped channel sections negative fire performance, cavity insulation materials are utilised in the LSF configuration to enhance its fire performance. The lightweight concrete filling in LSF is a novel idea that could be practically implemented in the construction, which would enhance both fire performance and the mechanical performance of LSF walls.Originality/valueLimited studies have investigated the fire performance of structural elements exposed to realistic design fires. Numerical models developed in those studies have considered a similar approach as models developed to simulate standard fire exposure. However, due to the heating phase and the cooling phase of the realistic design fires, the numerical model should incorporate both temperature and phase (heating and cooling phase) dependent properties, which was incorporated in this study and validated with the experimental results. Further lightweight concrete filling in LSF is a novel technique in which fire performance was investigated in this study.

Preparation and characterization of waterproof autoclaved aerated concrete using molybdenum tailings as the raw materials

As a kind of solid waste, molybdenum tailings are used to prepare low density autoclaved aerated concrete (AAC) (dry density ≤450 kg m−3), which greatly improve their utilization rate and reduce stockpiling. Several studies showed that hydrophobic agents could further increase the performance of AAC by reducing the water absorption and improving the thermal insulation properties. The present study investigates the impact of different water-repellents such as powdered silane, zinc stearate, water dispersible zinc stearate, and osmotic crystalline on the compressive strength, thermal conductivity, and water absorption of AAC. The amount of water-repellent to be added to the AAC samples is calculated by the mass of total siliceous and calcareous materials and the following concentrations of water-repellents are mixed with AAC: 0.05%, 0.1%, 0.15%, 0.2%, 0.25% and 0.3%. Spectroscopic and microscopic analyses revealed the content and morphology of the hydration products of AAC, and the changes in the pore structure. The obtained results clearly suggest that all the tested hydrophobic agents can reduce the water absorption and improve the compressive strength and the thermal insulation properties of AAC samples. Interestingly, powdered silane has the best effect when compared to other water-repellents tested in this study. The improved performance of powdered silane is due to the formation of a hydrophobic film on the surface of the pore wall, which, in turn, increases the content of tobermorite crystals, and reduces the pore size of AAC samples.

Recycling of Mining Waste in the Production of Masonry Units

Masonry units made of clay or Autoclaved Aerated Concrete (AAC) are widely used in constructions from Romania and other countries. Masonry units with superior mechanical and thermal characteristics can improve the energy efficiency of buildings, especially when they are used as the main solutions for building envelope construction. Their production in recent years has increased vertiginously to meet the increased demand. Manufactured with diversified geometries, different mechanical and/or thermal characteristics have a high volume in the mass of the building and a major influence in their carbon footprint. Starting from the current context regarding the target imposed by the long-term strategy of built environment decarbonization, the aim of the paper is to analyze the potential of reusing mining waste in the production of masonry units. Mining waste represents the highest share of waste generated at national level and may represent a valuable resource for the construction industry, facilitating the creation of new jobs and support for economic development. This review presents the interest in integrating mining wastes in masonry unit production and the technical characteristics of the masonry units in which they have been used as raw materials in different percentages. Critical assessment framework using SWOT analysis highlights the key sustainability aspects (technical, environmental, social, economic) providing a comprehensive and systematic analysis of the advantages and disadvantages regarding the integration of mining waste as secondary raw materials into masonry units production.

Influence of hydrothermal synthesis conditions and carbonation on physical properties of xonotlite-based lightweight material

This paper investigates the effect of the hydrothermal synthesis conditions on the formation of xonotlite and the change of xonotlite-based lightweight material’s (Xo_AAC) physical properties under carbonation. Experiments included: quantitative X-ray diffraction, scanning electron microscopy, thermogravimetric differential thermal analysis, drying shrinkage, carbonation shrinkage, compressive strength, mercury intrusion porosimetry, thermomechanical analysis, solid-state nuclear magnetic resonance, water vapor absorption isothermal, and nanoindentation test. The pure crystalline xonotlite was formed at 230 °C for the autoclaving time of more than 18 h and at short heating time (2 h). The drying shrinkage and dimensional change rate of Xo_AAC were smaller than that of autoclaved aerated concrete (AAC). The compressive strength of Xo_AAC was slightly increased after carbonation. The carbonation of Xo_AAC occurred more quickly than AAC containing silicone oil. However, the amount of carbonation shrinkage was almost the same for both Xo_AAC and AAC in a later period.

Influence of Aluminium and Autoclaving Temperature on the Properties of Autoclaved Aerated Concrete

Autoclaved aerated concrete (AAC) prepared by the mixing of ordinary Portland cement, lime powder, sand, aluminium powder and water. This study covers the variation of physical, mechanical and functional properties of autoclaved aerated concrete with autoclaving temperature and aluminium content and compared with that of normal weight cement mortar sample. In this work, two dosage of aluminium content of 0.4% and 0.8% of the dry weight of ordinary Portland cement and three different autoclaving temperature of 160oC, 180oC and 200oC were used. AAC sample with 0.8% aluminium and 160oC temperature had unit weight of 1490kg/m3 which was lowest among all samples including the control or normal weight cement blocks. Weight reduction of AAC sample was 31.53%. AAC sample with 0.4% aluminium and 200oC autoclaving temperature gave maximum compressive and tensile strength of 19.4MPa and 1.81MPa respectively which were close to that of normal weight concrete and strength of AAC increased with autoclaving temperature and decreased with aluminium content. In this research, the functional propertiesof AAC, absorption capacity was much higher than normal weight concrete and this capacity was increased with aluminium content and with decreasing autoclaving temperature and unit weight of AAC. For AAC with 0.8% aluminium and 160oC temperature gave maximum water absorption capacity (=9.93%). Again, surface absorption rate was higher for first 12hours and with time it would be constant because of its saturated position. Journal of Engineering Science 12(3), 2021, 11-17

The Physical and Mechanical Properties of Autoclaved Aerated Concrete (AAC) with Recycled AAC as a Partial Replacement for Sand

The application of AAC has increased considerably in Malaysia since the 1990s. The usage of AAC has some advantages, but it also has negative environmental impacts since rejected concrete will become landfill. This study aimed to use AAC waste powder as a material that would partially replace the sand content to produce a new form of Autoclaved Aerated Concrete (AAC). The physical and mechanical properties of the newly developed AAC were investigated. This paper presents improved mechanical and physical properties of the new form of recycled AAC concrete. Besides these improvements, using recycled AAC could lower production costs. Furthermore, the usage of this recycled waste powder is both economically and environmentally advantageous. This study found that when recycled AAC was substituted for sand, AAC with a fine recycled powder content of 30% had a compressive strength that was around 16% higher than conventional AAC and between 29% and 156% higher than any value attained utilizing an industrial waste product. This study also confirmed that the greater strength could be identical to a higher tobermorite phase and that the recycled AAC surface showed a finer crystalline morphology.

Mechanical properties and development of light weight concrete by using autoclaved aerated concrete (AAC) with aluminum powder

Autoclaved Aerated Concrete is a lightweight and flexible concrete and they're frequently utilized as building blocks. The examiner of Autoclaved Aerated Concrete replacing natural sand via way of means of fly ash is investigated. Design AAC having a mix proportion percentage of 1:4 with a water-cement ratio of 0.7. In those specimens the use of lime and without lime, the sand is partially changed via way of means of fly ash, and cement is partially changed via way of means of lime. The gypsum is continuously used inside the specimens. The Aluminum powder is used on a variety of 0.27 g, 0.7 g, 0.77 g, and 1 g of the overall weight of concrete. The characteristics of the mortar, including density, water absorption, and compressive strength during 24-hour steam curing, were determined in this procedure. The paper provides the consequences of the research to gain the complete intake of strong waste and decrease the charges of the project. In this examine natural sand is partially changed via way of means of fly ash and cement is partially and changed via way of means of lime. The mix proportion used 1:4 with a water-cement ratio of 0.7. In this research, the specimen is examined with and without lime. Gypsum is continuously used within side the whole specimens. Different percent of aluminum powder is used 0.03%, 0.06%, 0.077%, 0.2%, and 0.13% of overall weight of concrete. Different residences of concrete consisting of compressive strength, water absorption, density have been determined.

Study on seismic performance of red brick walls vs. Autoclaved Aerated concrete block walls

Bricks are usually the building blocks of a structure’s wall. In India, the construction of buildings using red bricks is commonly practised, which causes a heavy load on the structure, leading to seismic failure. The popularity of red bricks is because of its durability, low-cost, convenience and feasibility, however, due to the growing needs, the demand for red bricks has been increased rapidly. To match this demand, Fertile lands are to be sacrificed which it cannot be done on large scales. To add on, the demand for skilled labour and the cost of fuel for klin also increases, these all factors together makes the red bricks costlier. Alternatives for bricks were researched, which This lead to Autoclaved Aerated Concrete (AAC),The lightweight rigid materials present in the AAC blocks reduce the self-weight of the building structure. AAC blocks are eco-friendly, lightweight, and all-weather construction materials that are designed to offer superior performance and durability. They are almost equivalent to, nine times the size of traditional red brick and also these provide better compressive strength. Out of all the labour demand is very minimal and workability is very high. so here we compare the analysis of the seismic performance of Red brick walls VS Autoclaved Aerated Concrete block walls. Here we considered an apartment building of G + 5 storeys in seismic zone III (Chennai). The impact of AAC blocks on seismic responses of RC framed structures is analysed by using the ETABS software. The primary goal is to compare the results of Storey displacement in both axis, Maximum base shear and storey drift under the seismic conditions and how AAC blocks are adequate when compared to conventional red bricks.

Development of green concrete using effective utilization of autoclaved aerated concrete brick trash as lightweight aggregate

Green concrete is a concrete which can be produced from waste material as at least one of its components and ensures life-cycle sustainability.In order to preserve natural resources by dropping excessive exploitation of rocks for aggregate production, researchers are intended to predict alternate aggregates towards developing green concrete for sustainable development of construction industry. This paper provides the results obtained from an investigation which was carried out using waste building block, namely Autoclaved Aerated Concrete (AAC) brick as aggregate for developing lightweight concrete (LWC). The property variations both in fresh and hardened states were studied using M20 and M30 grade normal strength concrete. The effect of AAC brick trash on concrete properties such as slump, density and variations in mechanical properties were determined and presented. The AAC brick trash was used under saturated condition and it was replaced the granite aggregate by 10 %, 20 %, 30 %, 40 %, 50 % and 60 %. The mechanical properties were conducted after the curing period of 7, 28 and 90 days. Ordinary Portland cement (OPC), Portland pozzolana cement (PPC-fly ash based) and Portland slag cement (PSC) were used in this investigation to evaluate the compatibility of AAC brick trash with cement paste. From the investigation, it was found that the ideal replacement of AAC brick trash was obtained to develop the green LWC by replacing the granite aggregate by 30 %, 31 % and 29.5 % while using OPC, PSC and PPC respectively, with reference to the density and mechanical properties of LWC.