Some properties of porcelinite lightweight aggregate self-compacting cornet

Dissertant

al-Shammari, Daliyah Shakir Atwan

University

University of Technology

Faculty

-

Department

Department of Building and Construction Engineering

University Country

Iraq

Degree

Master

Degree Date

2006

English Abstract

In recent years, the design of modern reinforced concrete structures becomes more advanced, the designed shapes of structures are becoming increasingly complicated and heavily reinforced, at the time, and there is shortage of skilled labor especially at construction sites.

Furthermore, there is great request to save in construction time and dead load for foundations and also to eliminate problems associated with vibration.

Therefore, the newly born lightweight aggregate self-compacting concrete (LWASCC) as an innovative building material will offer new possibilities and prospects.

In this study, the fundamental objective is to examine the possibility of using local naturally-occurring porceiinite rocks (available in western desert of Iraq) with viscosity modifying agent (VMA) for the production of two types of porceiinite LWASCC; all-LWASCC and sand-LWASCC.

The effect of incorporating VMA (Sika ViseoCretc-I) on the some properties of LWAC is investigated.

The experimental program is divided into three parts ; in the first part, the slump of 75 ± 5mm and fresh density test were carried out on two types of reference concretes (all-LWA and sand-LWA concretes) using compaction as in normal vibrating concrete (NVC).

In the second part, the self-compactabihty tests including; slump flow f SF), V-funnel, L-box and U-box were carried out on two types of concretes ; (all-LWASCC and sand-LWASCC) with and without VMA.

While in the third part, the 28 day air dry density, compressive strength, splitting tensile strength, static modulus of elasticity and absorption test were achieved with and without using compaction for reference concretes and self-compacting concrete (SCC) respectively.

The requirements of self-compact ability for SCC which include „ filling ability, passing ability and segregation resistance were fulfilled when using VMA at 3 % by weight of cement for all-LWAC and sand-LWAC respectively.

However, the values of dry density and compressive strength at 28 day are within limits of structural lightweight concrete (LWC).

At 28 day, the air dry density and cube compressive strength are 1623 kg / m3 and 26.10 MPa for all-LWASCC and 1847 kg / m3 and 38.75 MPa for sand-LWASCC respectively.

The corresponding values in splitting tensile strength, static modulus of elasticity and absorption are 1.49 MPa, 10.22 GPa and 17.87 % for all-LWASCC and 2.51 MPa, 15.67 GPa an 11.09 % for sand-LWASCC respectively.

Results indicate that all-LWASCC and sand-LWASCC showed considerable improvements in all properties compared with their corresponding reference concretes.

All-LWASCC demonstrates 37.80 % increase in compressive strength, 19.20 % increase in splitting tensile strength, 5.25 % increase in static modulus of elasticity and 23.04 % reduction in absorption compared with their corresponding reference concrete at 28 day.

While, the corresponding values relative to sand-LWASCC are 39.68 %, 23.64 %, 12.89 % and 26.55 % respectively.

Main Subjects

Civil Engineering

Topics

• Concrete
• Aggregates(Building materials)

• APA
• MLA
• AMA

Language

English

Data Type

Arab Theses

Record ID

BIM-305890