Some properties fiber reinforced foamed concrete

Dissertant

al-Safar, Duha Muzaffar Abd al-Razzaq

Thesis advisor

Abbas, Walid Abd al-Razzaq
Ahmad, Hisham Khalid

University

University of Technology

Faculty

-

Department

Department of Building and Construction Engineering

University Country

Iraq

Degree

Master

Degree Date

2012

English Abstract

Most of the recent works in construction industry in Iraq were focused on investigating the validity of local raw materials as an alternative to the imported materials necessary for some practical applications, especially in thermal and sound insulation.

The main aim of this thesis is to study the production Lightweight Concrete (LWC) by using a foaming agent by weight of water and using sand as a partial replacement and total replacement of local Porcelanite rocks for the production of lightweight foamed concrete.

The experimental work is divided into two stages.

The first stage is to find the optimum dosage of foaming agent, and tests made in this stage were dry density, compressive strength, and thermal conductivity.

The tests were performed for mortar specimens at ages of (7and 28) days.

In the second stage on concrete specimens, many variables have been considered to be used (0.5, 0.75, and 1) % volume of fraction of crimped plastic fiber and using sand as a partial replacement and total replacement of local Porcelanite rocks.

The tests that made in this stage were density, initial surface absorption, water absorption, ultrasonic pulse velocity, acoustic impedance, compressive strength, splitting tensile strength, flexural strength, and impact resistance.

These tests were conducted for specimens at the ages of (7, 28, and 60) days.

It was found that the optimum dosage of foaming agent according to density, compressive strength, and thermal conductivity of mortar was 2% from water, where the magnitude of the density, compressive strength, and thermal conductivity was 1608 kg/m3, 6 MPa, and 0.53 W/m.

K, respectively.

The test results also indicated that the compressive strength, ultrasonic pulse velocity, dry density and acoustic impedance of the composites were reduced when the crimped plastic fiber volume fraction increases.

The percentage of reduction in compressive strength at 60 days was 6.7, 18.5, and 25.2% by addition of 0.5, 0.75, and 1% by volume of fiber respectively.

The percentage of reduction in ultrasonic pulse velocity at 60 days was 3.5, 8.5, and 12.4% by addition 0.5, 0.75, and 1% by volume of fiber respectively.

The percentage of reduction in dry density at 60 days was 3.3, 5.5, and 8% by addition 0.5, 0.75, and 1% by volume of fiber respectively.

The percentage of reduction in acoustic impedance at 60 days was 7, 13.5, and 19.5% by addition of 0.5, 0.75, and 1% by volume of fiber respectively.

While the splitting tensile strength, flexural strength, impact resistance, and water absorption increased with increasing fiber volume fraction.

The percentage of increment in splitting tensile strength at 60 days was 19.23, 32, and 51% by addition of 0.5, 0.75, and 1% by volume of fiber respectively.

The percentage of increment in flexural strength at 60 days was 2.6, 4.13, and 5.12% by addition of 0.5, 0.75, and 1% by volume of fiber respectively.

The percentage of increment in impact resistance at 60 days was 251, 320, and 369% by addition of 0.5, 0.75, and 1% by volume of fiber respectively.

The percentage of increment in water absorption at 60 days was 16.6, 27.13, and 37.1% by addition of 0.5, 0.75, and 1% by volume of fiber respectively.

Main Subjects

Engineering & Technology Sciences (Multidisciplinary)

Topics

• Reinforced concrete

• APA
• MLA
• AMA

Language

English

Data Type

Arab Theses

Record ID

BIM-418979