No. 1688, Gaoke East Road, Pudong new district, Shanghai, China.
No. 1688, Gaoke East Road, Pudong new district, Shanghai, China.
Observations of Impact Test Observations Sample 1 Sample 2 Total weight of dry sample (W1 gm) 350gm 354gm Weight of portion passing 2.36 mm sieve (W2 gm) 54gm 78gm Aggregate Impact Value (percent) = W2 / W1 X 100 15% 22% Result of Impact Test Aggregate Impact Value = 15% & 22% COMMENTS The aggregate impact value …
W3= wt of fines passing through 2.25 mm sieve FIGURE :- THEORY: - A test designed for to evaluate the toughness of stone or the resistance of aggregate to fracture under repeated impact is called impact test. The aggregate impact value indicates relative measures of resistance of aggregate to impact, which has different effect then the ...
Table 3: Aggregate Impact Value Test Resu lts ... The petrographic observations revealed that the Mesozoic limestones of the area are dominantly composed of micrite, sparite, and …
AGGREGATES IMPACT VALUE TEST (IS: 2386 PART-IV). Purpose: The purpose of this test is to determine the impact value of coarse aggregate. The aggregate impact test value is a measure of resistance to sudden impact or shock, which may vary from its resistance to gradually applied compressive load.
In contrast, using windowed aggregate functions instead of GROUP BY, you can retrieve both aggregated and non-aggregated values. In data.table we do := and by in one query to achieve it. So it appears that the syntax is designed to circumvent the limitation of standard SQL where group-by results could not be combined with unaggregated values (i ...
Finally, the strength of aggregate has a direct impact on the concretes' strength, as the stiffer aggregate provides lower impact value and vice versa . Accordingly, the impact values of NCA, VLA and LYA were 9.65%, 39% and 21.55%, respectively.
Experiment No. 4: Determination of the aggregate impact value of different coarse aggregate samples. (BS 812) Scope & significance: Aggregate Impact Value The aggregate impact value gives a relative measure of the toughness or the resistance of aggregate sudden shock or impact is not proportional to the resistance to a slowly applied compressive load.
The aggregate impact value gives a relative measure of the resistance of an aggregate to sudden shock or impact, which in some aggregates differs from Its resistance to a slow compression load. The Indian Standard CODE IS 2386 (Part IV) – 1963 is used for procedure and classification of aggregate by result.
Sieve 1.70 mm and as given in Table 1. for different grades of aggregates; Abrasive charge: It consists of cast iron spheres or steel sphere app 48 mm in dia and weighing 390 to 446 gm No of spheres are chosen from Table - 2 as per the grade of aggregates. ... Aggregate Impact Value Aggregate Crushing Value Aggregate Abrasion Value ...
Then aggregate impact value is expressed as the percentage of fines formed in terms of the total weight of the sample. Observations:- Table: Impact value of sample aggregates
It is carried out by filling a steel test mold with a sample of aggregate (10 14 mm) and then the impact load applied is by dropping hammer at a height of 380 mm. The Aggregate Impact Value (AIV) is the percentage of fines passing 2.36 mm BS test sieve after 15 blows [9]. Table 6: Test result of aggregate impact value
AGGREGATE IMPACT VALUE This test is done to determine the aggregate impact value of coarse aggregates as per IS: 2386 (Part IV) – 1963. The apparatus used for determining aggregate impact value of coarse aggregates is Impact testing machine conforming to IS: 2386 (Part IV)- 1963,IS Sieves of sizes – 12.5mm, 10mm and 2.36mm, A […]
The values of aggregate crushing test agree in general with that of aggregate impact test. The crushing strength test is most significant as far as the conditions to which the aggregates is likely to be subjected in practice are concerned. The suitability of aggregate in the pavement layers is dependent upon the type of road construction.
The crushed aggregate is allowed to pass through 2.36 mm IS sieve. And the impact value is measured as percentage of aggregates passing sieve (W2) to the total weight of the sample (W1). Aggregate impact value = (W1/W2)*100. Aggregates to be used for wearing course, the impact value shouldn't exceed 30 percent.
Place the mould in the aggregate impact testing machine and administer 15 numbers of blows of a metal hammer. After that, remove the crushed aggregate and sieve it through a 2.36 mm sieve. The aggregate impact value is measured as % of aggregates passing through the 2.36mm sieve (W2) to the total weight of the sample (W1).
f) To fill up the observation table correctly. g) To report as per instruction. Theory. The specific gravity of an aggregate is defined as the ratio of the mass of the solid of a given volume of sample to the mass of an equal volume of gas-free distilled water, both taken at the standard temperature i.e. 27-degree celsius.
and observation. There is strong evidence that aggregate type is a factor in the strength of concrete. Ezeldin and Aitcin (1991) compared concretes with the same mix proportions containing four different coarse aggregate types. They concluded that, in
OBSERVATION AND CALCULATION Table-5.4 Impact value of fresh and waste aggregate Trials sample 10 gm sieve, w2gm % impact Average of dry aggregate passing 2.36mm value aggregate Total weight IS Weight of fines Aggregate Impact value 1 (fresh) 656 40 6.09% 6.09% 2 (waste) 608 77 15.63% 13.38% 3(waste) 635 33 11.13% 13.38% RESULT: The mean A.I.V ...
4 Aggregate crushing value = {W 2 /[W 1-W]} x 100 in % Mean value The mean of the two results to the nearest whole number is reported as Aggregate impact value of the given material. INTERPRETATION OF RESULTS Depending on the maximum limits of aggregate impact values given in the table below,
The aggregate impact value gives a relative measure of the resistance of an aggregate to sudden shock or impact, which in some aggregates differs from its resistance to a slow compressive load. 2.Apparatus Required Fig. 1: Balance Balance should be accurate upto 1 g Fig. 2: Sieves Seives required are 12.5, 10.0 and 2.36 mm Fig. 3: Impact ...
The ' Aggregate Impact Value' is the mean of two observations, rounded to a nearest whole number. Precautions Place the plunger centrally so that it falls directly on the aggregate sample and does not touch the wall of the cylinder in order to ensure that the entire load is …
The aggregate impact value indicates a relative measure of the resistance of the aggregate to a sudden shock or impact which in some aggregates differs from its resistance to a slow compressive load. From the calculations done we know that the aggregate can be acceptable as their Aggregate Impact value is less then 20% Aggregate Impact Value 10.
1. A quantity of aggregate shall be taken sufficient to provide the minimum number of 200 pieces of any fraction to be tested. 2. The sample shall be sieved with the sieves specified in Table 1: Size of Aggregate thickness (mm) Thickness Gauge * (mm) Length Gauge ** (mm) Passing through IS Sieve Retained on IS Sieve 63 50 33.90 - 50 40 27.00 81 ...
Aggregate Impact Value Tester IS : 2386 (Part-IV) i) Impact testing machine conforming to IS: 2386 (Part IV) – 1963. ii) IS Sieves of sizes – 12.5mm, 10mm and 2.36mm. iii) A cylindrical metal measure of 75mm dia. and 50mm depth. iv) A tamping rod of 10mm circular cross section and 230mm length, rounded at one end. v) Oven. PREPARATION OF ...
Table 2 : Observation Table for Specific gravity of Aggregate finer than 6.3 mm 6. General Remarks 1.The specific gravity of aggregates normally used in construction ranges from about 2.5 to 3.0 with an average value of about 2.68. 2.Specific gravity of aggregates is considered as an indication of strength. Material having higher Specific
Aggregate Impact value Test Apparatus Procedure and uses. The aggregate impact value is the mean of two observations, rounded to a nearest whole number precautions place the plunger centrally so that it falls directly on the aggregate sample and does not touch the wall of the cylinder in order to ensure that the entire load is transmitted on ...
The approximate bulk density of aggregate that is commonly used in normal-weight concrete is between 1200-1750 kg/m 3 (75-110 lb/ft 3). Here, the Standard test method for determining the bulk density of aggregates is given in ASTM C 29 (AASHTO T 19).
Aggregate impact value is used to classify the stones in respect of their toughness property as indicated below in Table 1. Table 1: Classification of aggregate based on aggregate impact value Aggregate impact value (%) Quality of aggregate < 10 Exceptionally strong 10 – 20 Strong 20 – …
The aggregate impact value is a measure of resistance to sudden impact or shock, which may differ from its resistance to gradually applied compressive load. Procedure o f Aggregate Impact Test The test sample consists of aggregates sized 10.0 mm 12.5 mm. Aggregates may be dried by heating at 100-110° C for a period of 4 hours and cooled.
Objective For determination of the aggregate impact value of coarse aggregate, which passes 12.5 mm. IS sieve and retained on 10 mm. IS sieve. Reference Standards IS: 2386(Part IV)-1963 Methods of test for aggregate for concrete Part IV Mechanical Properties. Equipment & Apparatus Aggregate Impact Test Machine Sieves (12.5mm,10mm) Cylindrical metal measure Tamping Rod …
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Steel ball bearings in the hardness test To produce the abrasive action using standard steel balls that, when mixed with the aggregate and rotated in a drum for a specific number of revolutions, impact the aggregate.. The wear per age due to friction with steel balls is determined and is known as the abrasion value.