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The Effect Of Partial Replacement Of Conventional Fine Aggregate (sand) With Lateritic Soil In The Production Of Sandcrete Bricks
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Curing. The next morning of the brick-molding, the bricks were lifted to an erect position side. Water was sprinkled on them till they were completely drenched and this water sprinkling process was repeated at 2:00pm of each day. The bricks were cured for a period of 7, 14 and 28days before testing for their compressive strength while the other properties were conducted after 28 days curing aged. The moulded specimens were cured are put in sealed plastic bag in the laboratory to prevent loss of moisture by evaporation.
Test on Specimen
1) Density: Three bricks from each batch were randomly selected after the 2 days curing age. They were gently, wiped with non-absorbent cloth in order to remove any dust or loose matter stuck to them before measuring their dimensions (i.e. length, breadth and thickness). The bricks were weighed and then the densities were calculated after which the average were deduced.
2) Compression test: This test was conducted in two areas; dry compression and wet compression test. Both tests used three bricks from each batch which were without cracks and selected at random.
Bricks used for the wet compression test were immersed totally in water for 24hours after the 28 days curing age. They were wiped after removal and air-dried for 15 minutes determining their compressive strength using an electronic ADR 2000 Compressive Strength Machine (CSM) with a pace rate of approximately 6.SOkN s until the resistance of the specimen to the increasing load breaks down and no greater load can be sustained. This test was performed to investigate the performance of the bricks after extreme moisture/humid condition.
On the other hand, randomly selected bricks for the dry compression test were wiped and crushed for their compressive strength using the same process.
3) Water Absorption property: The water absorption property of a specimen determines the extent to which the test piece is susceptible to seepage of water through its pores when immersed in water. This test focused on the change in weight of the specimen as indicated that this provided a useful measure of the durability of bricks building materials. This property was measured by the change in specimen weight after 28 days curing age in laboratory environment. Specimens for this test were randomly selected from each batch, cleaned and oven dried. They were then oven dried for 24 hours at the temperature 110°C until the mass became constant and again weighed. This weight was noted as the dry weight (Mo) of the block. Specimen were then immersed totally in water at normal temperature for 24 hours. The bricks were later removed and its weight recorded as the wet weight (M2). The absorbed water expressed in percentage is deduced from Equation I below.
(M_2-M_0)/M_0 x100
3.2 Moisture Content Determination
Water content determination is a simple laboratory test to determine the amount of water present in a quantity of soil relative of its dry weight. Mathematically,
〖WW〗_w/Ws x 100
Where, W = water content
Ww = weight of water
Ws weight of dry soil
Aim: To determine the moisture content of the soil sample
Apparatus: Weighing instruments, empty can (labeled), oven, soil sample, mixing can and water
Procedure: A large amount of soil sample was poured into a large mixture can, water was added to this sample and soil sample was thoroughly mixed. An empty labeled can was weighed on a balance to know the weight and it was latter half filled with the soil sample and it was weighed again. This soil sample was kept in the oven for 24hours at 110°c. this sample was allowed to cool for 1 Omins and it was weighed.
3.2.1 Bulk Density Determination
Bulk density is the ratio of the mass of representative wet
Sample to the volume of the mould containing such sample.
Mathematically,
Y=m/v
Where
Y bulk density
M mass of representative wet sample
V = volume of moulds
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ABSRACT - [ Total Page(s): 1 ]ABSTRACT WILL BE HERE SOON ... Continue reading---
CHAPTER ONE - [ Total Page(s): 2 ]CHAPTER ONE1.0 Introduction Lateritic soils are formed in hot, wet tropical regions with an annual rainfall between 750 to 300mm, (usually in areas with a significant dry season) on a variety of different types of rock with high iron content. The location on the earth, that characterize these conditions fall between latitude 35oS and 35oN (Person, 1970).Laterisation is the removal of silicon through hydrolysis and oxidation that result in the formation of laterite and lateritic soil ... Continue reading---
CHAPTER TWO - [ Total Page(s): 9 ]CHAPTER TWO2.0 Literature ReviewLaterite is often used to describe the clinkered siliconized clay material. According to Amu et.al. (2011), it could be described as materials with no reasonable constants properties while Villain Cocinaet et.al. (2003), described it as a red friable clay surface, a very hard homogenous vesicular massive clinker-like material with a framework of red hydrated ferric oxides of vesicular infill of soft aluminum oxides of yellowish color. Villain Cocinaet et.al ... Continue reading---
CHAPTER FOUR - [ Total Page(s): 15 ]PERCENTAGE OF STABILIZER ... Continue reading---
CHAPTER FIVE - [ Total Page(s): 1 ]CHAPTER FIVE5.0 CONCLUSIONS, REFERENCE AND RECOMMENDATION. 5.1 Conclusion. Tests
have been conducted to evaluate the suitability of lateritic soils
along Asa dam area Ilorin kwara state and its effect on the strength of
sandcrete bricks when used to replace the conventional fine aggregate,
the following conclusions can be drawn from the analysis of the results:
I. The use of lateritic fine as a partial replacement has a significant influence on the engineering pro ... Continue reading---
REFRENCES - [ Total Page(s): 3 ]REFERENCESAdam, E. A. (2001): Compressed Stabilised earth block manufactured in sudan, A. Publication for UNESCO (online) Available from http://unesdoc.unesco.org.Adepegba, D.A. (1975). “Comparative Study of Normal Concrete which contains Laterite Fines instead of Sand†Building Science; 10:135-41.Agbede, I.O. and Manasseh, V. (2008): use of cement sand admixture in lateritic brick production for low cost housing Leonardo electric Journal of practices and technology, 12, pp163-174.Ak ... Continue reading---
