Structural Performance of Composite Walls Made Out of Recycled Construction Waste and Stabilized Rammed Earth C Jayasinghe Department of Civil Engineering, University of Moratuwa, Sri Lanka. WMCDJ Fonseka Department of Civil Engineering, University of Moratuwa, Sri Lanka. YM Abeygunawardhene Department of Civil Engineering, University of Moratuwa, Sri Lanka. ABSTRACT: In developing countries accumulation of unmanaged industrial construction waste is becoming a major environmental concern since it ends up as piled up landfills. Innovation of sustainable construction materials through recycling of such waste appears to be a viable solution to this problem. Recycled construction materials will also be an economical option in designing green buildings. There has been no significant research carried out to utilize construction waste as a walling material. The aim of this research is to find a solution for the construction waste in the form of a walling material for building construction. Waste materials such as concrete, plasters, pebbles and bricks with mortar are selected for the study and they were crushed and sieved through 10mm-15mm and 15mm-20mm sizes separately. A mix proposition was selected based on standard testing for grading of aggregate. The processed construction waste was mixed with laterite soil and cement. This mixture was used as dry ingredients rammed of stabilized rammed earth walls. The optimum proportion of construction waste, soil and cement was established using experiment results of cube testing. The recommended mix proportion was used to construct the wall panels for compressive testing. Durability of the proposed walling material was tested using accelerated spring erosion method. The strength and durability of the composite material has been found satisfactory, which paves the path for another green construction material. Key words: Construction Waste, Green walling material, Rammed earth wall, Building Construction, Strength and Durability 1. Introduction Masonry is one of the most popular building materials for construction of houses due to availability, cost effectiveness, durability, thermal comfort and adequate resistance to weathering. Sustainable development is emerging rapidly all over the world in the 21 st century as global climate change becomes an increasingly serious concern for the future. The continuous use of natural resource based building materials has led to many environmental problems. Therefore, it is essential to develop alternative building materials that can give a comparable performance with respect to appearance, structural properties and durability. One such material that has captured the interest of many researchers in the recent past is earth. Earth or soil can be used as a walling material by compacting between temporary forms. It is widely known as rammed earth walls. Rammed Earth buildings have many favorable qualities. It doesn’t require a complicated construction process and it is economical to build. It needs low maintenance and is suitable for cold and hot climates. However, there are a few undesirable properties such as loss of strength when saturated with water, erosion due to wind or driving rain and poor dimensional stability. These drawbacks can be significantly reduced by adding cement [1] . According to the study done by Jayasinghe and Kamaladasa (2006) on compressive strength characteristics of cement stabilized rammed earth walls, it was found that cement stabilized rammed earth can be used as a material for loadbearing walls of two storey houses [2] . Jayasinghe and Mallawaarachchi (2009) studied the flexural strength of compressed stabilized earth masonry walls. The research produced positive results which indicate that compressed stabilized earth walls have adequate flexural strength [3] . Construction industry generates a large amount of waste, in quantities that are fast increasing with economic and