DEVELOPING ECONOMICAL ROLLER COMPACTED CONCRETE MIX FOR PAVEMENTS: 3. EXPERIMENTAL WORK & DESIGN(part 1)

EXPERIMENTAL WORK & DESIGN(part 1)

 3.1    Object of Testing

The main objective of testing was to know the behavior of concrete with replacement of ordinary sand with stone dust at room temperature. The main parameters studied were workability and compressive strength.

The materials used for concrete samples are tested in laboratory and results are tabulated.

3.2 Test Results of Materials Used In Present Work

3.2.1    Cement

ACC cement (PSC), [W-50, M-12, Y-2008] IS:455, CM/L: 1205730 was used for all concrete mixes. The cement used was fresh and without any lumps. Testing of cement was done in the lab. The various tests results conducted on the cement are reported in Table 2.

Table 2. Properties of Cement

S.No. Characteristics Values Obtained Standard value
1. Normal consistency 29.5%-
2. Setting time:a.    Initialb.    Final 120 min. Not less than 30 minutes. 205 min. Not greater than 600 min.
3. Compressive Strength:a.    3 Day’sb.    7 Day’s 25.0    N/mm235.0    N/mm2
4. Fineness(%) 3.5 % < 10
5. Specific gravity 3.12
6. Soundness(By Le-chatelier Expansion) 2 mm

Locally available coarse aggregates having the maximum size of 20mm were used in the present work. Testing of coarse aggregates was done as per IS: 383-1970. Then in partial proportion the 12mm size metal were taken. The results of various test conducted on coarse aggregate are given on Table 3, Table 4 & Table 5.

Table 3. Fineness Modulus/Grading of Coarse Aggregate

S.No. SieveSize MassRetained CumulativemassRetained Cumulative Percentage Retained (%) Percentage Passing (%)
1 40 mm 00 00 0.0 100.0
2 20 mm 110 g 110 g 2.2 97.8
3 10 mm 3675 g 3785 g 75.7 24.3
4 4.75mm 1190 g 4975 g 99.5 0.5
5 Pan 25 g 5000 g 0.0
Total XC 177.4

Fineness Modulus of Coarse aggregate = £C+500/100= 177.4 + 500/100 = 6.77

Table 4. Properties of Coarse Aggregate

S.No. Characteristics Value
1. Type Crushed
2. Maximum Size 20 mm
3. Specific gravity 2.65
4. Moisture Content 0.0 %
5. Water Absorption 0.2 %
6. Bulk Density :
(a) Loose 1407.4 Kg/m3
(b) Compacted 1648.8 Kg/m3

Table 5.

Sieve Size 40 mm 20 mm 10 mm 4.75
% Passing 100.0 97.8 24.3 0.5

As per IS:383, Coarse aggregate is well graded.

3.2.1 Fine Aggregate-Sand

The sand used for the experimental programme was locally available river sand. Properties of the fine aggregate used in the experimental work are tabulated in Table 6 & Table 7 and 8.

Table 6. Fineness Modulus/Grading of Fine Aggregate (Sand)

S.No. Sieve Size MassRetainedIn gm Cumulative mass Retained in gm CumulativePercentageRetained(%) Percentage Passing (%)
1 4.75 mm 4 4 0.4 99.6
2 2.36 mm 7 11 1.1 98.9
3 1.18 mm 236 247 24.7 75.3
4 600 mic 266 513 51.3 48.7
5 300 mic 385 898 89.8 10.2
6 150 mic 94 992 99.2 0.8
7 Pan 8 1000
Total XC 266.5

Fineness Modulus of Fine Aggregate (Sand) = ^C/100 = 266.5/100= 2.665

Representative APR 391%. Average APR for this type of loans is 391%. Let's say you want to borrow $100 for two week. Lender can charge you $15 for borrowing $100 for two weeks. You will need to return $115 to the lender at the end of 2 weeks. The cost of the $100 loan is a $15 finance charge and an annual percentage rate of 391 percent. If you decide to roll over the loan for another two weeks, lender can charge you another $15. If you roll-over the loan three times, the finance charge would climb to $60 to borrow the $100.

Implications of Non-payment: Some lenders in our network may automatically roll over your existing loan for another two weeks if you don't pay back the loan on time. Fees for renewing the loan range from lender to lender. Most of the time these fees equal the fees you paid to get the initial payday loan. We ask lenders in our network to follow legal and ethical collection practices set by industry associations and government agencies. Non-payment of a payday loan might negatively effect your credit history.

Calculate APR