Behaviour of reinforced concretes with addition of ground clay bricks waste against corrosion by chl

• 作 者: ValdithLJer(o)nimo[1]PabloRRFerreira[1]GibsonRMeira[2]
• 机 构: Civil Construction Department, Federal Institute of Education, Science and Technology of Paraíba,580
• 出 处: The 14th International Congress on the Chemistry of Cement (
• 发表日期: 2015年期

　　This work analyses the behaviour of concretes with replacements of cement by ground clay bricks waste (GCBW) against reinforcement corrosion by chlorides.Reinforced concrete specimens with 80 x 80 x 80 mm were cast with cement mass replacements of 0 %, 10 %, 20 % and 30 % and water to binder ratio of 0.55.Cylindrical concrete specimens were also cast for compressive strength tests.All the specimens were wet cured for seven days and remained in laboratory environment until being tested.The cubic specimens were subjected to wetting and drying cycles in 1M sodium chloride solution after a delay of 180 days for concretes to reach a more stable microstructure.When identified reinforcement despassivation by electrochemical measurements,total and free chloride profiles were obtained for each specimen and from that the critical chloride contents at surface level of rebar.Results show that there is a slight decrease in compressive strength that tends to be reduced over time.In a similar way, the critical chloride content tends to decrease for concretes with GCBW,which is explained by the alkalinity decrease in porous network solution for these concretes.On the other hand,concretes with GCBW tend to present a decrease of its mass transport ability, which can compensate the previous loss of performance and extend the initiation period of corrosion.