Behavior of heavy-duty roller compacted concrete pavements reinforced with fibers

Dissertant

al-Janabi, Muhammad Abd al-Razzaq Ahmad

Thesis advisor

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

Roller compacted concrete (RCC) is a concrete without slump, reinforcement and finishing.

It is compacted using vibratory roller.

When compared with conventional concrete, it contains less water content to achieve concrete without slump.

The RCC technique reduces both time and cost so it is necessary to study the behavior of RCC pavement.

The main aim of this research is to study the effect of using the steel fibers (volume fraction, type) on the behavior of roller compacted concrete pavement.

A comparison is made between the laboratory results and the results obtained from roller compacted concrete casted on site.

The experimental work includes making a number of trial mixes to choose roller compacted concrete mix which is achieved in many steps.

The first step is to specify the optimum cement and water content which is designed in laboratory using 300 kg/m3of cement and 0.5 W/C ratio while the second step includes using the optimum sand content of 700 kg/m3 and the third step includes using the optimum percentage and type of the additive materials (metakaolin and hydrated lime) while the forth step includes using two types of steel fibers (hooked and crimped) with percentages (0.25%, 0.5%, 0.75%) by volume with optimum type and percentage of additive materials (15%) hydrated lime and also the experimental work includes preparing cylindertest pecimens with size (150*300) mm and prisms of size of (100*100*400) mm.

The research also includes studying the physical properties (compressive strength, splitting tensile strength, flexural strength, absorption, dynamic modulus of elasticity and ultrasonic pulse velocity) of specimens reinforced with steel fibers and without steel fibers.

Also the experimental work includes casting slab with dimensions (2*2*0.1)m on site (outside the laboratory) from RCC reinforced with steel fibers with volume fraction of 0.5% and for both types (hooked and crimped).

The compaction process is made by using vibratory plate compactor test specimens which were obtainedby using core machine and also prisms were prepared within slab (pavement) after being cut to the required dimensions.

The results indicate that the optimum mix of RCC can be obtained by using 15% of hydrated lime as a replacement of cement and the good properties are compared with other mixes.

Also the results of RCC specimens reinforced with steel fibers (hooked and crimped) show improvement in flexural strength (modulus of rupture) and splitting tensile strength compared with the specimen without steel fibers such that the average rate of increase at age 28 days in compressive strength, splitting tensile strength and modulus of rupture was (4.3%), (30.1%) and (62%) respectively.

Also the results of testing for the specimens of the slab casted on site show a slight reduction in compressive strength, splitting tensile strength and modulus of rupture and the rates of reduction are (5.0%, 6.0%, 7.7%) respectively for hooked steel fibers and (3.4%, 6.3%, 2.7%) respectively for crimped steel fiberscompared with the specimens casted in laboratory.

Main Subjects

Civil Engineering

• APA
• MLA
• AMA

Language

English

Data Type

Arab Theses

Record ID

BIM-420188