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UNIVERSITY OF SOUTH ALABAMA
DEPARTMENT OF Telephone: (251) 460-6174
CIVIL, COASTAL AND ENVIRONMENTAL Facsimile: (251) 461-1400
ENGINEERING
150 Jaguar Drive, Shelby Hall 3142 http://www.southalabama.edu
Mobile, Alabama 36688-0002
October 10
th
, 2017
Shenghua Wu
Department of Civil Engineering
University of South Alabama
Subject: CE 315 CE Materials Laboratory Lab 6: Concrete Batching and Cylinder
Fabrication
Introduction
Designing or mixing concrete incorporates a number of steps. This is attributable to the
economical, sustainable, durable, and versatility of concrete. Consequently, there is need for
precision and accuracy in steps involved in manufacturing cement; this froths from the need for
high-quality concrete.
A plant that is involved in manufacture of concrete combines ingredients such as air, water,
admixtures, aggregate, silica fume, cement, slag, sand, and fly ash. Henceforth, there is a need to
mix these ingredients with conformance to mass or volume before mixing them. In this light, this
experiment aims to propose a mix design for concrete utilizing ASTM C31. As well, this
experiment puts to perspective a strength of 2500 psi out of which the concrete’s strength will be
tested for 14 day and 28 day strengths. As well, unit weight, slump, and air content will be
carried out.
Team Members
Shadi Alzahrani, Cory Judkins, Ali Alshehri.
Literature Survey
Batching process in earlier days was mainly done using volume. However, specifications follow
the process follows mass in comparison to volume. Below are percentages of measures for
materials to be used gauging with accuracy.

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Cement
In a case where cement is more than 30% of size capacity, then its measuring correctness should
be around 1% of necessary mass. However, in a case where it is less than 30% then the accuracy
should be around 4% of necessary quantity.
Aggregates
Should the measurement exceed 30% of scale capacity, measuring accuracy should follow 1%.
In the contrary, the measuring accuracy should be under 3%.
Water
Water should be measured in its appropriate volumetric quantity usually 1kg= 1 liter. In this
case, the accuracy of measurement should be in the range of 1%.
Admixtures
Chemical admixtures may utilize the recommended accuracy for water. On the other hand,
mineral admixtures should follow cements. This accuracy measures follow the fact that mineral
admixtures may be used partially to replace cement, while, chemical admixtures are mainly in
the form of liquid hence their accuracy’s kowtow to water’s.
Usually, this process follows stirring or rotation with the objective being coating the surface of
aggregate particles with paste from cement, as well as blinding ingredients into a regular mass.
Thereafter, the concrete is subjected to processes of compaction and placing which are
undertaken simultaneously. These processes are important in ensuring durability,
impermeability, and strength are achieved in the structure of concrete.
Method
This lab was conducted by the use of preliminary calculations found from previous data for the
properties of coarse and fine aggregates. The team began by collecting the required amount of
material and separating them into different buckets. Once all of the materials were collected they
were transported near the mixer. The team checked the mixer to make sure that it was clean and
ready for use. After the inspection the mixer was turned on and shut off after a few revolutions.
Then approximately 1/3 of the volume of water was added to the mixer, and the mixer was
turned on again for a few revolutions. When the mixer was stopped the powder like cement
along with the aggregates and remaining water were added to the mixer, and the mixer was
powered back on. The team let the mixer run for a few minutes to ensure that all of the materials
were fully mixed.

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1 UNIVERSITY OF SOUTH ALABAMA DEPARTMENT OF CIVIL, COASTAL AND ENVIRONMENTAL ENGINEERING 150 Jaguar Drive, Shelby Hall 3142 Mobile, Alabama 36688-0002 Telephone: (251) 460-6174 Facsimile: (251) 461-1400 http://www.southalabama.edu October 10th, 2017 Shenghua Wu Department of Civil Engineering University of South Alabama Subject: CE 315 CE Materials Laboratory – Lab 6: Concrete Batching and Cylinder Fabrication Introduction Designing or mixing concrete incorporates a number of steps. This is attributable to the economical, sustainable, durable, and versatility of concrete. Consequently, there is need for precision and accuracy in steps involved in manufacturing cement; this froths from the need for high-quality concrete. A plant that is involved in manufacture of concrete combines ingredients such as air, water, admixtures, aggregate, silica fume, cement, slag, sand, and fly ash. Henceforth, there is a need to mix these ingredients with conformance to mass or volume before mixing them. In this light, this experiment aims to propose a mix design for concrete utilizing ASTM C31. As well, this experiment puts to perspective a strength of 2500 psi out of which the concrete’s strength will be tested for 14 day and 28 day strengths. As well, unit weight, slump, and air content will be carried out. Team Members Shadi Alzahrani, Cory Judkins, Ali Alshehri. Literature Survey Batching process in earlier days was mainly done using volume. However, specifications follow the process ...
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