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العنوان
Study of Drying - Shrinkage and Factors Affecting it /
المؤلف
Omer, Abd El Moneim Mamon.
هيئة الاعداد
باحث / عبد المنعم مامون عمر
مشرف / محمد حامد خورشيد
مناقش / عبد الكريم عطا
مناقش / محمد عبد الحميد جوده
الموضوع
Drying.
تاريخ النشر
1972.
عدد الصفحات
118 p. :
اللغة
الإنجليزية
الدرجة
ماجستير
التخصص
الهندسة المدنية والإنشائية
الناشر
تاريخ الإجازة
19/11/1972
مكان الإجازة
جامعة أسيوط - كلية الهندسة - structural engineering
الفهرس
Only 14 pages are availabe for public view

from 132

from 132

Abstract

A brief summary of conclusions that can be drawn from the previous detailed results are presented below:
I- the following factors affected considerably the drying-shrinkage of concrete:
a) Water-cement ratio: an increase of I percent increased total shrinkage by about I percent.
b) Cement content: an increase of I percent increased total shrinkage by about 1/2 percent.
c) Aggregate content: the relative values of total shrinkage of neat cement paste to cement mortar to concrete were 4:2:1 respectively.
d) Aggregate type: the gravel mixes gave the greatest amount of drying-shrinkage compared to other aggregates such as limestone and basalt.
e) Aggregate size: increasing the aggregate size reduced the drying-shrinkage and so the coarse aggregate was the prominent in decreasing the drying shrinkage.
f) Additions: hydrated calcium chloride increased considerably the drying-shrinkage the addition of pozzolance materials increased also the drying-shrinkage.
g) Curing: moist curing caused higher shrinkage values more than those of air curing. Noticing that the shrinkage values were measured after the curing period.
h) Reinforcement: an increase in reinforcement percentage decreased the shrinkage values.
2- The shrinkage values at periods of 30, 100 and 500 days after the curing period attained about 60, 80 and 95 percent of the total shrinkage values; these ratios was nearly independant of all factors.