TY  - JOUR
T1  - Practical Consideration of Using Silica Fume as a Cement
Replacement in Concrete
AU - , Moh`d El Khatieb 
JO  - Journal of Engineering and Applied Sciences
VL  - 12
IS  - 17
SP  - 4526
EP  - 4530
PY  - 2017
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2017.4526.4530
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2017.4526.4530
KW  - Silica fume
KW  -transition zone
KW  -high performance concrete
KW  -concrete parameters
KW  -admixtures
KW  -pozzolanic activity
AB  - In literature there are many studies dealing with silica fume effect on concrete strength and properties
but most of the experimental data available up to day, indicate that there are no radical results or mathematical
models which can describe a constant effect. The scatter values of both experimental and numerical methods
due to the continuous variety of the physical and chemical characteristics of the concrete components which
needs to be investigated for each mix design in fact tests on mix design with variable components and
parameters always referred to certain mix design at certain time and place. The present theoretical and
experimental study will contribute to the available studies done in the past with new results and comments in
particular the mix design physical and chemical properties and the variation of concrete properties when using
silica fume and how it influences the concrete mix design, exploring the merits and practical considerations of
using such material with recommendations and practical estimation on its utilization. Also, this investigation
has been aimed to bring awareness amongst the practicing civil engineers regarding advantages of these new
concrete mixes, the performance characteristics of the ready mix concrete become an essential requirement of
concrete mix proportions which may include but are not limited to: setting characteristics, material
compatibility evaluation, workability, place ability, strength, uniformity, durability and permeability. In general,
the high-performance concrete is characterized by a compressive strength in the range of 60-100 N/mm2 this
high value due to: the reduced water/cement ratio (0.40-0.20), compensated with the use of super-water-reducing
admixtures. Use of mineral additions, alone or in combination with high pozzolanic activity and/or high specific
surface area such as silica fume, slag micro fine, etc. Aggregates of high quality grind (basalt, granite, etc.)
capable of ensuring a high intrinsic mechanical strength of the rock and good adhesion at the interface between
the stone and cement matrix element.
ER  -