Preface - kmutt

202
durian fiber-based construction material
production are as follows, durian fiber length of
< 2 mm, cement: sand: durian fiber as 1: 1: 0.10
and 0.6 W/C ratio. Two sizes of sand
commercially available were considered: < 0.71
mm and 0.855 ± 0.145 mm. Rice husk ash was
used to replace Portland cement type I by weight
of 0%, 10%, 20%, 30% and 40% to produce
composite. Dimensions per spicemen were
fabricated : 5: 5: 5 cm 3 . Spicemens were
incubated in water for 28 days. The reults
revealed the replacement of Portland cement
type I with 10%, 20%, 30% and 40% of ground
rice husk ash produced high strength durian fiber
based construction material and 30% and
replacing portland cement type I by ground rice
husk ash gave the highest compressive strength.
Compressive strength of composites increased
when its fineness was increased by grinding.
The fineness of rice husk ash was the major
factor affecting the strength of composites. The
results also showed that the bulk density and
thermal conductivity of composites are inversely
proportional to the percentage of rice husk ash
content and size of sand. In addition, chemical
composition of durian fiber from dried durian
peel revealed that durian fiber is composed of
holocellose, hemicelluse and lignin. Replacing
partial Portland cement by rice husk ash reduced
alkaline pore water in the composite, thus,
reduced breaking the link between the individual
fiber cells. Rice husk ash can slow down the
embrittelment process of natural fiber
composite.
IC-356 THE EFFECT OF SLUDGE FROM
BIOGAS APPLICATION TO CROP AND SOIL
[SOIL NUTRIENTS CHANG, GROWTH AND
YIELD OF ASPARAGUS (Aseparagus officinalis
L.)]
Kotchakorn Kongkaew, Wasana Manish,
Todsaporn Tongtieng
The 1 st International Symposium on Sustainable
Agriculture for Subtropical Regions (ISSASR-
1), November 23-25, 2005, Changsha, People’s
Republic of China, p. 75
In order to reduce more and more
chemical fertilizer used in Asparagus planting of
the farmers in Pootharam district, Ratchaburi
province, the effects of sludge from biogas
digesting and chemical fertilizer on soil
properties, growth and yield of Asparagus was
investigated in the farmer field during January to
KMUTT Annual Research Abstracts 2005
April 2004. The experiment was arranged as a
randomized completed block design with 3
replications on clayey soil, Aerie Tropaqepts;
Fine, mixed, non-acid. Five different fertilizer
applications included 1) application of 12.5 t/
ha -1 animal manure + 15-5-20 of 2 t /ha -1 (T1),
2) application of 6.25 t/ ha -1 animal manure +
12-24-12 of 2.53 t /ha -1 (T2), 3) application of
6.25 t /ha -1 sludge + 15-5-20 of 2 t /ha -1 (T3), 4)
application of 20.5 t /ha -1 sludge + 15-5-20 of 1 t
/ha -1 (T4) and 5) application of 34.8 t /ha -1
sludge (T5) were used as treatments. The results
revealed that significant yield weight of good
grade was obtained in the treatment of
application of 34.8 t ha -1 sludge (T5) compared
to the treatment of T2. The low grade and total
fresh yields weight was not significantly among
all treatments. When the yield of Asparagus was
separated into the three groups of standard size
of A, B and C grades, corresponding results to
the yield of good grade was found. The
application of 34.8 t ha -1 sludge (T4) yielded
significantly the A and B grades of Asparagus
more than another treatments. In term of soil
nutrients change, soil nitrogen, organic matter,
Fe, Mg, and Cu in Tl was increased significantly
compared to the soil nutrient prior to
experiment, but it was not found in the treatment
of application of 34.8 t /ha -1 sludge (T4). In
conclusion, the application of 34.8 t /ha -1 sludge
yielded well Asparagus of A and B grades in the
range of 12-15 t ha -1 y -1 , although lead to higher
soil nutrients decreasing more than T1.
Learning Institute
IC-357 A JOURNEY OF LEARNING
TOWARDS HAPPINESS
Subhashini Passi
The 19 th International Conference, “Learning
Organization in a Learning World” (ICLORD
2005), April 18-22, 2005, King Mongkut’s
University of Technology Thonburi, Bangkok,
Thailand, pp. 882-889
This paper is a story of a learning life
based upon social and personal experiences that
emanated from philosophical analysis, historical
readings, and personal experiences. The story of
this learning has three phases; introduction,
experimentation and conclusions. The process
outcomes are embedded along the journey and
product outcomes are given at the end.
International Conference