This study evaluates the use of fibre and ash from sugar cane bagasse in extruded cementitious composites.This work aims to study the potential of the use of fibre and ash from sugarcane bagasse in construction, fibre and ash since the use of this product in cementitious matrices represents a good alternative to reduce expenses with local deposition of the waste, prevents the degradation of the environment.The ash sugar cane bagasse has pozzolanic characteristics, and ensures a reduction in cement consumption.Fibres from sugar cane bagasse (FSB) were classified by sieving, washed in boiling water to reduce the residual sugar and has been chemically treated with sodium silicate and aluminium sulphate in order to protect the fibres against the aggression of alkaline provided by the cement, immobilize the organic material and reduce the absorption of water, reducing size variations and provide better quality in the composite, such as durability and prevent the attack of microorganisms.The ashes of sugar cane bagasse (ASB) were burned with controlled temperature and time to have a great degree of amorphous and consequently higher reactivity.The grinding was also performed to improve the reactivity of the ashes.We performed a series of tests to characterize the ASB.The pozzolanic activity was determined by electrical conductivity test.The physical and mechanical performance and microstructure of cement composites were evaluated.The composites were evaluated before and after cycles of accelerated ageing.Extrusion was used as an alternative to the Hatschek process in the production of cementitious composites with different geometries and small scale production.The results show that boiling FSB reduces the residual sugar and chemically treated to mineralized FSB quickly.The ASB showed the value of high silica.The mechanical and physical results showed satisfactory results.Plates were produced with 0.5% 1.0% 1.5% 3.0% and 5.0% of enhanced levels of FSB.Composites extruded with 5% increase of FSB with 28 days of healing showed better results in toughness (TE) due to introduction of increased FSB in the composite, but no difference between the chemical treatments.Composites extruded with 5% strengthening of FSB treated 200 ageing cycles had higher water absorption (AA) and apparent porosity (AP).This fact can be explained with the higher hydration of cement which caused drastic mineralization FSB and off the fibre and fibre-matrix interface.Extruded composite with 5% FSB treated with 28 days and 200 cycles with replacement of cement by 30% of ASB showed low modulus of rupture (MOR) and higher water absorption (AA).This fact must be explained by replacing the matrix (aggregate) and higher water/cement ratio of the mixture caused by its specific surface.Further studies should be conducted to better match the fibre and ash and the extrusion process to enable its future use in industrial scale.