971 Words4 Pages

1) A brief description of the activity
The activity involved the testing of aggregates in a laboratory to determine whether they are suitable for use as aggregates for concrete. The tests involved the use of a Flakiness Index (FI) to define their shape, a grading and Fineness Modulus (FM) to determine their sizes and a 10% Final Aggregate Crushing Test (FACT) to determine their strength. During the laboratory tests the students were required to take notes of what was being said.
2) Importance of properties of aggregates
Aggregates make up about 70% of the volume of concrete (Owens, 2013). They do not react with cement and water; they are present to make a stronger more durable and workable cement mix and are used as filler in the concrete*…show more content…*

It refers the proportion of flaky particles within a given sample. (Owens, 2013) The FI involves the use of a flakiness gauge, which is a flat piece of metal with rectangular gaps cut into it; each gap in the gauge represents a different size, measured in millimeters. It is calculated as the percentage of the mass of stone that will pass through gaps of a given width for the appropriate size of the aggregates. (Owens, 2013)Values of the Flakiness Index taken during the laboratory tests are shown in appendix 3.1.4) 10% Final aggregate crushing test (FACT) The FACT is used to assess the resistance of an aggregate to mechanical degradation and to compare aggregates. These results do not necessarily relate to the compressive strength of concrete made with that aggregate (Afrisam, 2016). Once the crushing has taken place the material is placed into a sieve and the final material is the material that passes through a 2,8mm sieve. If the final material is not exactly 10% of the original mass of material then the test has to be redone until exactly 10% is reached. All the groups’ results were put into a table and with these results a graph plotting a trend line could be produced. Using this trend line, the FACT results were calculated by solving for x in the trend line equation. This result came to be 367,5*…show more content…*

Round aggregates are optimum aggregates to use because the load is distributed over the whole area of the aggregate. Elongated aggregates are weaker than round aggregates because the load is applied at a point of weakness on the aggregate. Aggregates have a FM as low as 0.5 (consists of very fine sand) and have a FM as high as 3.5 or more (consisting of very coarse sands). The medium range of FM lies between 2.4-2.9 thus means that there is a balance between fine and coarse sands

It refers the proportion of flaky particles within a given sample. (Owens, 2013) The FI involves the use of a flakiness gauge, which is a flat piece of metal with rectangular gaps cut into it; each gap in the gauge represents a different size, measured in millimeters. It is calculated as the percentage of the mass of stone that will pass through gaps of a given width for the appropriate size of the aggregates. (Owens, 2013)Values of the Flakiness Index taken during the laboratory tests are shown in appendix 3.1.4) 10% Final aggregate crushing test (FACT) The FACT is used to assess the resistance of an aggregate to mechanical degradation and to compare aggregates. These results do not necessarily relate to the compressive strength of concrete made with that aggregate (Afrisam, 2016). Once the crushing has taken place the material is placed into a sieve and the final material is the material that passes through a 2,8mm sieve. If the final material is not exactly 10% of the original mass of material then the test has to be redone until exactly 10% is reached. All the groups’ results were put into a table and with these results a graph plotting a trend line could be produced. Using this trend line, the FACT results were calculated by solving for x in the trend line equation. This result came to be 367,5

Round aggregates are optimum aggregates to use because the load is distributed over the whole area of the aggregate. Elongated aggregates are weaker than round aggregates because the load is applied at a point of weakness on the aggregate. Aggregates have a FM as low as 0.5 (consists of very fine sand) and have a FM as high as 3.5 or more (consisting of very coarse sands). The medium range of FM lies between 2.4-2.9 thus means that there is a balance between fine and coarse sands

Related

## Sodium Chloride Mixture Lab Report

1215 Words | 5 PagesKnow how to use an electronic balance, calibrate glassware, and know how to use a volumetric flask, calculate density and know how to calculate the percent error. The first thing we need to do is determine the best procedure for measuring density. The materials needed are going to be a 10mL volumetric flask. Conduct 3 separate trials where we will measure the density between different salt solutions. In this experiment we have 6% salt solution, 12% salt solution, 18% salt solution and 24% salt solution.

## Weak Acid Lab

647 Words | 3 PagesThe purpose of the K_a determination of an unknown weak acid lab was to use titration in order to determine the K_a for an unknown solid weak acid knowing only its molar mass. The previous laboratory experiment was performed in order to determine whether titration or dilution would yield more accurate K_a. It was determined that titration yielded more accurate results. This lab was performed by taking a sample of solid weak acid and dissolving it in water before titrating with the strong base NaOH. Titration is a technique in which a reagent of known concentration is slowly added to an unknown solution in order to calculate the concentration of the unknown.

## Magnesium Synthesis

1911 Words | 8 PagesThe central purpose of this experiment was to determine the experimental empirical formula of an oxide of magnesium by performing a synthesis reaction. It was hypothesized that the formula that was derived from the recorded data would be identical to the theoretical empirical formula. After performing calculations with the data that had been collected within the duration of the experiment, it was deduced that the empirical formula of the product generated by the synthesis reaction was Mg5O6. Since the calculated formula did not match the postulated formula, MgO, the inceptive hypothesis was confuted. There was a large discrepancy in the results of students who replicated this experiment, the variation in data possibly having been evoked by the dissimilarity in

## Freezing Point Depression Experiment

912 Words | 4 PagesThis method is nearly always incorrect because it is difficult to obtain a perfectly saturated solution. In most cases, the solution remains unsaturated or it does not dissolve all the way. Also, for measuring the molar mass using freezing point depression for ionic compounds, it is important to determine the concentration of the particles of the solute, as the Van Hoff factor is not one, as it is for molecular solids. According to Atkins Peter, author and chemist of the book, Physical Chemistry says, “In predicting the expected freezing point of a solution, one must consider not only the number of formula units present, but also the number of ions that result from each formula unit, in the case of ionic compounds.” Therefore, this method works, but it is approximate and it works better for low solute concentrations. The presence of solute lowers the freezing point, which in turn affects the calculations to determine the molar mass of the unknown.

## Absolute Procedure Essay

846 Words | 4 PagesEQUIPMENT USED • Moulds of cast iron or steel, with removable base plate were prepared. The depth of the mould and the distance between the two pairs of opposite internal side faces had nominal size of 150 ± 0.15mm. • A steel compacting bar weighing 1.8kg, 380mm long and having a ramming face 16mm diameter. • Sampling tray • Shovel Mixing The concrete was mixed by hand, the coarse aggregate were batched

## Geometry Quarter Exam

545 Words | 3 Pagesx=45 96 8. We know that a triangle 's total perimeter is 180. To solve this problem we must first add up the two lengths we do know and subtract them from the total number perimeter (180). Given. (70+35+x)=180 Check your answer Add.

## Sulphuric Acid Experiment

759 Words | 4 PagesThe concentration of the acid was 0.1M, which was placed in all three agar cubes to maintain consistency of results. Another variable of the experiment that was controlled was the time in which the agar cubes spent in the sulphuric acid. The time allowed calculation of the rate of diffusion. The size of the agar cubes was controlled by using a grid and scalpel to, as accurately as possible, cut the agar cubes into the appropriate sizes. The shape of the agar cubes was also controlled.

## Wittig Reaction Lab Report

1125 Words | 5 PagesThis was proved by utilizing the IR spectrum to verify the C=O was not in the final product as it lacked the 1640 cm-1 peak. The melting point of 113-115 degrees C proved that the final product obtained was the E-Stilbene. The TLC plate proved that the E and the Z product was produced, show cased by the double intensity of the DCM spot to the final product’s spot, both which had an Rf of 0.92. The double intensity proved that both products were produced, but through heating and filtering, the Z-Stilbene was

## Easter Island Earth Figure

866 Words | 4 PagesWhen starting studying East Islands statues, the primary interests of natural scientists are to predict and explain physical, chemical properties of stone statues, for instance, the elements, the weight, the density, the solidification, the melting point, the hardness, the conductivity, and the ductility. In order to achieve aims, they brought material entities, stone statues to the laboratory, observing them with the help of sophisticated instruments, mixing a piece of stone with certain chemical reagent. How do they deal with the differences among numerous small pieces of stones? Generally, natural scientists adopt the nomothetic approach to study natural sciences. The nomothetic approach, or the nomothetic model, generalizes rules and patterns to seek general explanation of causes.

## Pozzolan Lab Report

791 Words | 4 PagesThe same water was used for mixing and curing of concrete cubes. Name of Test Results Coarse Aggregate Fine Aggregate Specific gravity 2.56 2.63 Absorption (%) 0.51 0.71 Fineness Modulus 1.6 6.9 Table 3: Physical properties of aggregates Pozzolan: The cement replacement material that used in the test was local natural pozzolan from Mont Popa. The chemical composition of pozzolan is given in Table 4. It is evident that the local natural pozzolan conforms to the requirements of ASM C 618 and hence, can be used as a partial replacement of the production of roller compacted concrete. Description Composition (%) Local Natural Pozzolan Requirements as per ASTM for class N Silicon dioxide (SiO2), aluminum oxide (Al2O3) and iron oxide (Fe2O3) 77.3 Min 70.00 Sulfur trioxide (SO3) 0.34 Max 4.00 Loss on ignition (%) 2.26 Max 10.00 Table 4: Comparison of local natural pozzolan with Class N of ASTM C 618 Method: The soil compaction method is the most widely used mixture proportioning method for RCC pavements.

### Sodium Chloride Mixture Lab Report

1215 Words | 5 Pages### Weak Acid Lab

647 Words | 3 Pages### Magnesium Synthesis

1911 Words | 8 Pages### Freezing Point Depression Experiment

912 Words | 4 Pages### Absolute Procedure Essay

846 Words | 4 Pages### Geometry Quarter Exam

545 Words | 3 Pages### Sulphuric Acid Experiment

759 Words | 4 Pages### Wittig Reaction Lab Report

1125 Words | 5 Pages### Easter Island Earth Figure

866 Words | 4 Pages### Pozzolan Lab Report

791 Words | 4 Pages