defined herein.
2.2.4
Nonshrink Grout
ASTM C 1107.
2.2.5
Admixtures
a.
Provide chemical admixtures that comply with the requirements
shown below and in accordance with manufacturer's recommendations,
and appropriate for the climatic conditions and the construction
needs. Do not use calcium chloride or admixtures containing
chlorides from other than impurities from admixture ingredients.
b.
Provide minimum concentrations of corrosion-inducing chemicals as
shown in Table 2 below. For concrete that may be in contact with
prestressing steel tendons, the concentration shall not exceed 60
percent of the limits given in Table 2. For the concentration in
grout for prestressing ducts, do not exceed 25 percent of the
limits in Table 2.
Table 2 - Limits on Corrosion-Inducing Chemicals
Chemical*
Limits, Percent**
Test Method
0.10
ASTM
D
512
Fluorides
0.10
ASTM
D
1179
Sulphites
0.13
ASTM
D
1339
Nitrates
0.17
ASTM
D
3867
* Limits refer to water-soluble chemicals
** Limits are expressed as a percentage of the mass of the total
cementitious materials.
c.
Provide anti-washout admixtures for underwater placement with a
proven record of performance and compatible with the chosen cement.
d.
The total alkali content shall not increase the total sodium-oxide
equivalent alkali content of the concrete by more than 0.5 lb/yd3
0.3 kg/m3.
[2.2.5.1
Air Entraining Admixture
Provide air entraining admixtures conforming to ASTM C 260. Provide the
admixture of such a type and dosage that the total air content in the
hardened concrete can be readily maintained within the limits specified in
Table 3.
Table 3 - Air Content
Nominal maximum size of
Size
Total air content,
coarse aggregate, mm
Number
percent by volume
9.5
8
6-10
12.5
7
5-9
19.0
67
4-8
25.0
57
3.5-6.5
37.5
467
3-6
50.0
357
2.5-5.5
SECTION 03311
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