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The Effect of Mixing Sewage Sludge with Cement and Its Effect on Treating Building Cracks
Organization(s):Um hany basic school
Country:Oman
Student(s):- Sundus bint Yahya Al-Jalandi – Grade 9
- Azza bint Rabeel Al-Daghishi – Grade 9
Grade Level:Secondary School (grades 9-12, ages 14-18)
GLOBE Educator(s):nawar alrawahi
Contributors:
Report Type(s):Standard Research Report
Protocols:Conductivity, pH, Salinity, Soil Moisture - Gravimetric, Soil pH
Language(s):English
Date Submitted:03/05/2025
Abstract
This research aims to study the effect of mixing sewage sludge with cement and its role in treating cracks in building walls. The study explores the following key questions:
1. What is the effect of mixing sewage sludge with cement used in construction?
2. What role does the resulting mixture of sludge and cement play in addressing cracks in building walls?
The results indicate that the addition of sludge alters the properties of cement, transforming it into a highly viscous solution. While there was a slight increase in salinity and conductivity, the pH value of the cement decreased after mixing with sludge. The difference in acidity between the cement sample and the sludge was (10.71 – 6.02 = 4.69) respectively, and then the acidity of the cement after mixing it with the sludge reached (10.08).
Gradually, different amounts of sludge were added to the cement. This had a clear effect in increasing the viscosity of the cement and obtaining a very thick product. It was observed that the mixture absorbed the amount of water added gradually to the mixture. The more water we added, the more the mixture dried out because of the intense absorption after adding the sludge.
This makes researchers recommend adding sludge to cement used in construction to enhance its moisture absorption capacity, potentially reducing the occurrence of cracks in buildings.