DETERIORATION OF CONCRETEMADE FROM VARIOUS TYPES OF CEMENT AND RECYCLED AGGREGATE DUE TO SULFURIC ACID ATTACK

This research is intended to investigate the effect of recycled aggregate concrete and various types of cement which are OPC, PCC and PPC due to sulphuric attack The concrete resistance to sulphuric attack is indicated by compressive straight and concrete deterioration. Each type of cement was mixed into three dosagesof recycled aggregate 0%, 25% and 100% as replacement of natural coarse aggregate. The specimen test is cylinder form 7.5cm in diameter and 15cm in high. The 27 samples were tested by immersion test while 9 others without immersion test.The researcher has cured 27 concrete samples in (H2SO4) 5% and the other concrete samples cured by air. After 28 days of age, the compressive strength test for both the samples which immersed in solution and by air was conducted. The process continued to the renewal of solution and measuring weights and diameters of the other samples in the solution every 2 weeks. After 56 days of age, the compressive strength test was conducted. Finally, the small portions of the surfaces and core of the samples were tested using XRD. It is noticed from compressive strength result the samples which cured by air gave better result than others which cured by solution. The higher percentage of recycled aggregates in the concrete means the less in compressive strength and less in resistance to acid attack. It is noted that mixtures which contain PPC are the most resistant to acid attack. Mixtures which contain PCC rank number two related to the resistance to acid attack. The mixtures which contain PPC have retained their size throughout the duration of curing. Keywords. Recycled aggregate, Deterioration, Sulfuric aci