Laboratory Investigations of Building Materials In the Vicinity of Nit Srinagar

Nadeem Gulzar Shahmir *  Manzoor Ahmad Tantray **
*-** Department of Civil Engineering, National Institute of Technology, Srinagar, Jammu, and Kashmir, India.

Abstract

This study is undertaken based on the different tests performed on the building materials in the region of National Institute of Technology, Srinagar, Jammu and Kashmir. A number of developments is done in the area where all the building materials get utilized on everyday schedule and most imperative being an engineering college in the civil engineering department part of casting for research motivation of beams, slabs, cylinders, cubes, columns,, and so forth is performed by B.Tech, M.Tech, and Ph.D., investigate researchers. Thus it was important to know the nature of the materials accessible at neighborhoods. No name of brand or merchant is referenced in this paper to stay away from any commercialization. The four fundamental building materials are cement, fine aggregates, coarse aggregates, and water. All the important tests on all the fundamental development materials were performed by rules given by Indian standard codes. The strategy and the instruments utilized for testing were, in accordance with Bureau of Indian Standards (BIS), that are accessible in NIT research labs. The cement was brought from the neighborhood market of Hazratbal close to NIT Srinagar while as the fine aggregates and coarse aggregates were taken from the river (nallah) Sindh of area Ganderbal 10 kms from NIT Srinagar and the water tried was the accessible faucet water at research laboratory at NIT. All the materials tried was found reasonable to use for development. The experiments were performed in the mid months of year 2017.

Keywords :

Introduction

For discovering initial setting time, final setting time, and soundness of cement, and quality a parameter known as standard consistency must be utilized. The standard consistency of a cement glue is characterized as that consistency, which will allow a Vicat plunger having 10 mm distance across and 50 mm length to enter to a profundity of 33-35 mm from the highest point of the form (BIS, 1988a; BIS, 1976b). For comfort, initial setting time is viewed as the time slipped by between the minutes that the water is added to the cement, to the time that the glue begins losing its versatility. The final setting time is the time slipped by between the minute the water is added to the cement, and when the glue has totally lost its versatility and has achieved adequate solidness to oppose certain unequivocal weight (BIS, 1988a; BIS, 1976b; BIS, 1988c). The fineness of cement has an imperative bearing on the rate of hydration and consequently on the rate of gain of solidarity and furthermore on the rate of advancement of heat. Finer cement offers a more prominent surface region for hydration and subsequently quicken the improvement of solidarity. The fineness of granulating has expanded throughout the years. However at this point it has about balanced out. Distinctive cements are ground to various fineness. The particle measure division beneath 3 microns has been found to have the dominating impact on the quality at one day while 3-25 micron portion affects the 28 days quality. Increment in fineness of cement is likewise found to expand the drying shrinkage of cement.

Fineness of cement is tried in two different ways:

The sieve analysis is led to decide the particle measure dissemination in a sample of aggregates, which we call gradation. The numerous a period, fine aggregates are assigned as coarse sand, medium sand, and fine sand. These orders don't give any exact importance. What the provider terms as fine sand might be extremely medium or even coarse sand. To keep away from this vagueness fineness modulus could be utilized as a measuring stick to show the fineness of sand. The breaking points might be taken as: (a) Fine sand: Fineness Modulus 2.2 - 2.6, (b) Medium sand: Fineness Modules 2.6 - 2.9, (c) Coarse sand: Fineness Modules 2.9 - 3.2. Sand having a fineness modulus above 3.2 will be unacceptable for making agreeable concrete (BIS, 1963a, BIS, 1970, BIS, 1962).

Pycnometer, a 1000-ml measuring cylinder, wellventilated oven, taping rod, filter papers and funnel are utilized to decide the specific gravity (BIS, 1963b). Indian Standard (IS) methods for test covers the system for deciding, in the field, the measure of surface moisture in fine aggregates by uprooting in water. The precision of the technique relies on exact data on the specific gravity of the material on a soaked surface dry condition. A similar method, with the proper changes in the measure of test and measurements of the compartment might be connected to coarse aggregates (BIS, 1963b).

A wire crate of not more than 6-3 mm mesh, a hefty watertight holder in which the bushel might be unreservedly suspended, very much ventilated oven, taping rod, an impenetrable compartment of limit like that of the container (BIS, 1963b). The grading alludes to the assurance of the particle estimate appropriation for aggregates. Grading limits and greatest aggregate size are indicated in light of the fact that reviewing and size influence the measure of aggregates utilized just as cement and water necessities, usefulness, pump ability, and toughness of cement. By and large, if the watercement (w/c) proportion is picked effectively, a wide range in evaluating can be utilized without a noteworthy impact on quality. At the point when gap graded aggregates are indicated, certain particle sizes of aggregates are excluded from the size continuum. The gap graded aggregates are utilized to acquire uniform surfaces in uncovered aggregate concrete. Close control of blend extents is important to stay away from segregation (BIS, 1963a; BIS, 1970; BIS, 1962).

Alkalinity of water is the limit of that water to acknowledge protons. It might be characterized as the quantitative limit of a fluid medium to respond with hydrogen Ions (BIS, 1986b). Causticity of water is its quantitative ability to respond with a solid base to an assigned pH. It might be characterized as identical centralization of hydrogen particles in mg/l (BIS, 1986a). The pH esteem is controlled by estimation of the electromotive power of a cell comprising of a marker cathode (an anode receptive to hydrogen particles, for example, a glass electrode) Immersed in the test arrangement and a reference terminal (usually mercury/calomel terminal). Contact between the test arrangement and the reference anode is typically accomplished by methods for a fluid intersection, which shapes some portion of the reference terminal. The electromotive power is estimated with a pH meter, that is, a high impedance voltmeter adjusted regarding pH (BIS, 1983).

1. Objectives

The following are the objectives clearly discussed in easy manner

2. Methodology

2.1 Procedure to Determine Standard Consistency

The experimental setup to determine standard consistency of cement is shown in Figure 1.

Figure 1. Experimental Setup to Determine Standard Consistency and Initial and Final Setting of Cement

2.2 Methodology to Determine Initial and Final Setting Time of Cement

2.4 Procedure to Determine Soundness of Cement

The experimental setup to determine soundness of cement is shown in Figure 2.

Figure 2. Experimental Setup to Determine Soundness of Cement (Shetty & Jain, 2018)

2.5 Procedure to Determine Compressive Strength of Cement

2.6 Procedure for Sieve Analysis of Sand

2.7 Procedure to Determine Specific Gravity of Fine Aggregates

Figure 3. Pycnometer used to Determine Specific Gravity

Specific Gravity =

Apparent Specific Gravity =

Water Absorption =

A = weight in g of saturated surface - dry sample,

B =weight in g of pycnometer or gas jar containing sample and filled with distilled water,

C = weight in g of pycnometer or gas jar filled with distilled water only, and

D = weight in g of oven - dried sample.

2.8 Procedure to Determine Surface Moisture

The surface water substance might be resolved either by weight or by volume. For each situation the test will be made at a temperature scope of 22 to 32°C. 5.4.2 Determination by Weight - The compartment will be topped off to the check with water and the weight in grams. The holder will be exhausted. Enough water will be put in the holder to cover the sample, after which the sample of fine aggregates will be brought into the compartment and the entrained air evacuated. The holder will at that point be filled to the first stamp and the weight in grams determined (BIS, 1963b). The measure of water dislodged by the sample will be determined.

2.9 Procedure to Determine Specific Gravity of Coarse Aggregates

Specific Gravity =

Apparent Specific Gravity =

Water Absorption =

A = Weight of saturated aggregate in water = (A1 - A2).

B = Weight of the saturated surface - dry aggregate in air.

C = Weight of ovendried aggregate in air.

A1 = Weight of aggregate and basket in water. 

A2 = Weight of empty basket in water.

2.10 Methodology for Sieve Analysis of Coarse Aggregates

2.11 Methodology to Determine Alkalinity, Acidity and pH Value of Water

Indication Method - Pipette 20 ml of a reasonable aliquot of sample into 100-ml beaker. On the off chance that the pH of the samples more than 8.3, add 2 to 3 drops of 'phenolphthalein Indicator and titrate with standard sulphuric acid arrangement till the pink shading seen by marker just vanishes (identicalness of pH). Record the volume of standard sulphuric acid arrangement utilized. Add 2 to 3 drops of blended pointer to the arrangement in which 'the phenolphthalein alkalinity has been resolved. Titrate with the standard acid to light pink shading (proportionality of pH 3-7)- Record the volume of standard acid utilized after phenolphthalein in alkalinity.

Indicator Method - Pipette 20 ml of a reasonable aliquot of sample into a 100-ml container. The sample measure will be so chosen with the goal that not in excess of 20 ml of titrant is required for the titration. Decide the pH of water. On the off chance that pH is under 3.7, include two drops of methyl orange indicator into the main sample beaker and titrate with standard 0.02 N sodium hydroxide solution until the point when the shading changes to the faint orange characteristics for pH 3.7. Record the volume of sodium hydroxide utilized. To the second example measuring glass, add 2 to 3 drops of phenolphthalein indicator and titrate with 0.02 N sodium hydroxide answer for the presence of faint pink shading attributes of pH 8.3. Record the volume utilized. A progression of Indicators and cradle arrangements are utilized for assurance of pH esteem by visual correlation.

3. Results

The proper procedure for testing of various building materials including cement, fine aggregates (sand), coarse aggregates and water is already explained in methodology part now moving on to the results all the four materials were separately tested and the results.

3.1 Cement Tests

Cement acts as a binding material in concrete and is considered as one of the most important part in construction and casting hence it is necessary to check the cement widely before being implemented in casting or construction. The cement tested is Ordinary Portland Cement (OPC) grade 43. The tested results are show in Table 1. The cement was found to be of good quality and is perfect to use in construction or casting of various research elements.

Table 1. Different Test Results of Cement (OPC grade 43)

3.2 Tests on Fine Aggregates (Sand)

Fine aggregates also known as sand is also used for construction and casting purpose, sand is also used for installation of tiles and has various other uses like plastering etc. hence it is equally important to determine the quality of fine aggregates before being implemented in use. For that purpose numbers of tests were performed on sand as shown in Table 2. From the results it was clear that the sand is of good quality from zone III and can be used for casting or construction purpose.

Table 2. Numbers of Test Results of Fine Aggregates

3.3 Tests on Coarse Aggregates

The coarse aggregates crushed stone particles of small size. Coarse aggregates may either be natural or artificial made by crushing stones. Coarse aggregates are available in different sizes 80mm, 40mm, 20mm, 12mm, 10mm etc the coarse aggregates are very important to be utilized in concrete to attain strength hence their quality equally needs to be determined. The test results of coarse aggregates are shown in Table 3 and was found to be of good quality.

Table 3. Test Results of Coarse Aggregates

3.4 Water Tests

The most important part of construction and which is least tested is water. Without water mixing is not possible, hence besides determining the quality of other materials it is important to determine the quality of water also. The water tested was water available at the lab directly collected from the faucet. Table 4 shows the results tested.

Table 4. Test Results of Water

Conclusion

From the above investigation, OPC cement grade 43 accessible close by at NIT Srinagar is of good quality with standard consistency of 31%, initial and final setting time of 117 and 312 minutes individually, fineness, compressive quality, rigidity, soundness, and explicit gravity was likewise decided and was found inside permissible limits suggested by IS codes. The fine aggregates and coarse aggregates accessible at region Ganderbal taken from stream of sindh about 10kms from NIT Srinagar are additionally of best quality. The specific gravity, water absorption, fineness modulus and surface moisture tests were additionally performed on fine aggregates and found within reasonable limits as per IS codes. The specific gravity, water absorption and fineness modulus tests were likewise performed on coarse aggregates and were found within the acceptable limits proposed by IS codes. The water accessible at NIT Srinagar lab is likewise of better quality and is safe to use for casting and development purpose.

References

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