การพัฒนาคอนกรีตที่มีส่วนผสมของวัสดุกากอุตสาหกรรมสำหรับป้องกันการกัดกร่อนโดยกรดและการขัดสีเพื่อประยุกต์ใช้กับพื้นฟาร์มสุกร

Abstract

The objective of this work was to investigate the resistance of concretes against acid corrosion and abrasive corrosion, which occurs in typical pig’s farm floors, especially near the feeding machine. Two types of industrial waste, which good pozzolanic properties, were used as cement replacement material to improve acid resistance of concrete specimens. For the concrete mixtures, cement was replaced by silica fume or fly ash for 10 wt.%. compare to concrete with ordinary Portland cement and hydraulic cement binders. Two types of concrete specimens were prepared for testing compressive strength, acid corrosion, abrasion
corrosion and acid-abrasion corrosion. The compressive strength test was conducted for 7, 14, 28, 56 and 84 days after casted. The results suggest silica fume effectively increases the compressive strength while fly ash slightly decreases. The resistance of the concrete against organic acid corrosion was improved by the substitution ordinary Portland cement by hydraulic cement and greatly improved when applying fly ash or silica fume as cement replacement. The improvement of abrasion resistance of concrete due to
using hydraulic cement or cement replacement materials demonstrate similar trend compared to acid corrosion resistant tested results. Two testing machines, one for organic acid corrosion tests in wet-dried conditions and an abrasion testing machine with steel wheels, were developed to simulate the attack on concrete floors in pig farms. The concrete slab was cast and tested with a wetdry switching system in an organic acid solution cooperating with an abrasion test. The test results demonstrate that applying fly
ash or silica fume is effective for increasing the resistance of the concrete against organic acid corrosion and abrasive corrosion.