| Author | Hong, Jen-hwa |
| Call Number | AIT Thesis no.ST-87-10 |
| Subject(s) | Aggregates (Building materials)
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | A feasibility study on the use of heat-treated aggregate as
structural lightweight concrete is made . Shale taken from Cha Am,
a district of Petchburi province located 120 km south of
Thailand, is used as raw material in the production of
lightweight aggregate. The properties of lightweight aggregate,
including bulk specific gravity, water absorption, porosity,
crushing value, and fineness mod ulus are determined. Concrete
mixes having different cement contents were cast. Three types of
concrete namely all - lightweight, se mi -lightweight , and normal
weight concrete were investigated for their compressive and
splitting tensile strength at different ages, unit weight,
modulus of elasticity, and shrinkage and creep deformations.
Test results showed that it is possible to produce
lightweight aggregate from Cha Am shale by firing the raw
aggregate in a crucible furnace at a temperature of 1 200°C for 8
minutes. The bloated Cha Am shale is found to be porous, and
possesses high absorption capacity, and high crushing value.
Moreover, the aggregate quality satisfies all the requirements
stipulated by the American Concrete Institute for use in
structural lightweight concrete. For the two types of lightweight
aggregate concrete investigated namely the all-lightweight and
semi - lightweight concrete, it is evident that the 28-day
compressive strength of se mi -lightweight concrete is
approximately 50 to 80% higher than that of all-lightweight
concrete depending on the amount of cement content, whereas the
unit weight of se mi - lightweight concrete is about 35% higher
than that of all-lightweight concrete . Due to its high porosity,
and water absorption capacity and its low strength property, the
strength of lightweight aggregate is increased considerably when
the maxi mum size of the lightweight aggregate is decreased or
vice versa. Under the condition of a sustained stress equal to
60% of its 28 - day compressive strength, the creep and shrinkage
deformations of all- lightweight and semi - lightweight concrete
are found to be approximately 1. 3 and 1. 1 times those of normal
weight concrete respectively. |
| Year | 1987 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Pichai Nimityongskul |
| Examination Committee(s) | Karasudhi, Pisidhi ;Pama, Ricardo P.
|
| Scholarship Donor(s) | Republic of China ( RSEA) |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1987 |