Page 83 - Abstract book - TJSSF-2020

Thailand – Japan Student Science Fair 2020 (TJ-SSF 2020)
“Seeding Innovations through Fostering Thailand – Japan Youth Friendship”

Effect of eggshell and marl addition on the properties of cruse pot for
hot saltpot application for postpartum women

Kwanchanok Jongpattana , Saowalak Sangkhao
1
1
Advisors: Wipawee Srihanon , Thanakorn Wasanapiarnpong
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2

Princess Chulabhorn Science High School Lopburi
1
Chulalongkorn University
2

Abstract
The project on Alternative materials to make a convenient pot for postpartum women is intended to
compare the ratio between clay to renewable material and compare the properties of the pot-based
material over salt, since the chicken egg shell is a residual material whose main composition is calcium
carbonate to decompose into some carbon dioxide. This allows for porosity in the terracotta body. The
marl is a white clay with naturally occurring calcium carbonate elements, which also helps to create a
perforation in the terracotta. That's why experiments are mixed in the clay to improve the porosity
properties. The experiment replaced Ratchaburi clay used for pottery with finely ground chicken
eggshells or inflatable pencils in 0 25 and 50 by mass to compare the ratio between Ratchaburi clay and
substitute. The clay is mixed with water in a ratio of approximately 18-22 percent by the mass, which
makes the clay texture to be sticky for molding, then molded in a metal mold to achieve a square shape
of 50x50 mm, approximately 10 mm thick, dried in the air for 1 day, and then burnt at different
temperatures which were divided into 800, 900, 1000°C. Take the samples of the burned specimens to
test the properties, comparable to the ratchaburi clay that does not fill the eggshell or marl used to mold
the pot over salt. 1. Measure color measurements with Konica Minolta Chroma Chroma Meter CR-400
to determine the color found in the material sample. 2. Density Measurement The replacement material
is weighed based on the principle of archimedes. 3. Measure thermal conductivity with transient hot
bridge - Thermal Conductivity Meter to know the timing of the most efficient thermal conduction of
renewable materials. 4. Strength test with 3-point bending strength test to study the strength of the salt
pot substitute. This will be the right ratio and properties to make the substitute for the salt pot.

Keywords: cruse pot, hot saltpot, chicken eggshell, marl

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