civil engineering material lab experiment

2. Designation: C 1012 – 034

3. GROUP MEMBERS;
SAFIULLAH(13ce07)
NASIR ALI(13ce32)
SECTION; A
SUBMITTED TO; ENGG SOHAIL SALEH
DEPARTMENT; CIVIL

4. Sequence of Presentation
 Scope
 Significance and Use
 Apparatus
 Reagents and Materials
 Procedure
 Calculation
 Report
 Keywords

5. Scope
 This test method covers the determination of length
change of mortar bars immersed in a sulfate
solution.
 The values stated in SI units are to be regarded as
the standard.
 This standard does not purport to address all of the
safety concerns, if any, associated with its use.

6. Significance and Use
 This test method provides a means of assessing the
sulfate resistance of mortars and blended hydraulic
cements.
 The standard exposure solution used in this test
method, may be used to simulate the environmental
exposure of interest.

7. Apparatus
(a)
(b)
(c)
(d)
(f )
 Mixer. (a)
 Cube Molds, (b)
 Bar Molds. (c)
 Comparator, (d)
 Containers, (e)
 Curing Tank, (f )

8. 4. Reagents and Materials
 USP or technical grade chemicals may be used.
 Sodium Sulfate (Na2SO 4)
 Sulfate Solution
 Graded Standard Sand.
 Stainless Steel Gage Studs .

9. Procedure
 Molding and Initial Curing of Specimens—Mold the
test bars and the cubes in accordance with Test. A set of
specimens to test one cement consists of 6 bars and up
to 21 cubes .after molding, cover the molds, and place
the mold in the curing tank in water at 35 6 3°C for 23 h
30 min. Place the sealed molds in the curing tank.
remove molds from tank and demold the specimens.

10. Subsequent Curing and Preparation for Test;
 store all bars in a curing tank of saturated limewater.
Break two cubes if the mean strength is 2850 psi or
more place all the bars in the sulfate solution.
If it is less than 2850 psi store all the demold cubes and
bars in the curing tank and test additional cubes
When reach to 2850 psi record comparator readings and
place all the bars in the sulfate solution

11. Measurements of Length Change:
 At 1, 2, 3, 4, 8, 13, and 15 weeks after the bars are placed in the
sulfate solution, test them for length change. Review the data at 15
weeks. If uniform length change is taking place, make the next
subsequent measurements at a minimum of 4, 6, 9, and 12
months. When the expansion is changing rapidlybmeasure the
bars at 4, 6, 9, 12, 15, and 18 months

13. Calculation
 10.1 Calculate the length change at any age as follows:
DL=[(Lx – Li)/Lg] 100
 where:
DL = change in length at x age, %,
L x = comparator reading of specimen at x age
L i = initial comparator reading of specimen-reference bar
comparator reading, at the same time
Lg = nominal gage length, or 250 mm (10 in.) as applicable.
 Calculate length change values for each bar to the nearest 0.001
% and report averages to the nearest 0.01 %.

14. Report
 Report type of cement, and, if blending material is used,
its identification and amount and whether cement and
blending material, if used, meet the applicable
specifications. Report the initial comparator reading of
each bar at the time of immersion in sulfate solution;
this is the base value for calculation of length changes.
Report the subsequent length changes in percent of base
value to the nearest 0.001 % for individual bars and the
nearest 0.01 % for averages.

15. Keywords
 acceptability; expansion; fly ash; mortars; pozzolans;
precision; search report; slag; sulfate attack; sulfate-resisting
cements; tests