An experimental investigation on strength characteristics of concrete using Wastepaper Sludge Ash (WPSA)

Umar, Tariq; Tahir, Abdullah; Umeokafor, Nnedinma; Nawarathna, Amalka; Zia, Asad; Honnur Vali, Mohamed shaik

Abstract

This study explores an experimental investigation in finding the strength characteristics of the concrete made with the addition of (WPSA) as a cementious material. The WPSA has some sort of pozzolanic properties and is high in silica, magnesium and low in calcium. Due to silica and magnesium content, it behaves like cement, and they also increase its setting time. The properties of concrete investigated where compressive strength, flexural strength, split tensile strength, slump test and water absorption test while WPSA was added in different percentages from 0 % to 40 %. The maximum coarse aggregate size used is 20mm.The M30 grade of concrete is designed using British Standard of mix design. The cubes of 150x150x150 mm were casted for the compressive strength test, cylinders of 150x300 mm were casted for split tensile strength test and beams of 100x100x500 mm were casted for the flexural strength test. All the specimens were placed in the water and then tested in the 7, 14 and 28 days. The WPSA concrete has some better mechanical and durability properties as compared to normal concrete. The compressive strength of the concrete was increased by adding 30 % of WPSA. The results further indicates that the split tensile strength and flexural strength of the same samples don’t increase. Overall, the addition of WPSA to a minimum of 30 % as a replacement of cement is helpful in increasing the strength value which is helpful in reducing the CO2 emission from the construction industry.

• Presentation Conference Type: Conference Paper (published)
• Conference Name: 12th International Conference on Construction in the 21st Century
• Start Date: May 16, 2022
• End Date: May 19, 2022
• Acceptance Date: Feb 16, 2022
• Deposit Date: Sep 24, 2022
• Volume: 12
• Pages: 130-137
• Keywords: Cement, Concrete, WPSA, Compressive strength, Construction Industry
• Public URL: https://uwe-repository.worktribe.com/output/10010682
• Publisher URL: https://www.citcglobal.com/citc-12papers