ML20126A208

Petrographic Rept,Project Examination of Concrete Samples from Facility Containment Bldg Base Mat,Ks

ML20126A208
Person / Time
Site:	Wolf Creek
Issue date:	07/02/1979
From:	ARMY, DEPT. OF, CORPS OF ENGINEERS
To:
Shared Package
ML20126A095	List: ML20126A093 ML20126A097 ML20126A120 ML20126A148 ML20126A167 ML20126A205 ML20126A208 ML20126A242 ML20126A256 ML20126A267
References
NUDOCS 8002140495
Download: ML20126A208 (7)

Text

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The design s rength at 90-davs age of the concrete in the base rat 6

j portica cf the L' elf Creek Flan is.5000 psi.

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part of 197 9 and issued several re: orts.

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Age, Strength, Ko.

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17 6794 25 4860

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.90 4370 27 June 1979 f rag ents cf f our ircken 90-day cylinders In additien, c vere receivai a: '25 f or exa ina:ict.

These cylinder fragnents are ide :ified heler:

No. of Correspondin;;

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,Dr. D. E. Campbell of the C :strue ien Technology Laboratories of the, 2 _Es s_.

FCA is the petrographer who made the pe:rographic exa.mination at the PCA.%

Ee spe : 19 June and part of 20 June 1979 at 1.'IS as an official cbserver gl and te dis:.ss his :hin see: ions.

Part of this time was used to verify that

.=_-h there.as acc:rd c: recognition of the varicus phases one vould encount er 5:1 1:.hin se::1::.s of cencrete.

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11.

The appearance of the concrete in the f:ag=ents of the f our cylinders j

(6 5 !. 6, 6f 57, 6659, 6767) was s'-'lar.

The paste was gray vi:h a slight

_=.__-

1 olf e:-i:> vitrecus luster rather than chalkv, or dull, which is often E_E-i e

indicative of concrete in coor condition.'

E i

=

=

12.

There was to evidence cf abno cal f eatures such as detricental i

alkali-silica c: alkali-carbonate rock reaction in the concrete fragnants.

.Ei..

P.icrescopic a :ents of white, r. orcellanous gel-like caterial vere observed E

in one v:id in cylinder 6546* in two voids in cylinder 6557, and in two r

voids ': c linder 6539.

Tcis caterial was so stall that it usually was no:

,=

de:.e: table by the untided eye.

Examination of sore of this caterial f ro=

n cylinders 65'6 and 6559 in pouder d ersion :oun:s with a polarizing 21erescope shoved it to be largely amorphous with a ref ractive index belov fl l.544 Th's ca trial is alkali-silica gel.

I:s presence indicates that h-c.

c-r.. _, 4. - s 4, < c c.

eace.-..

4

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a v..

e 4

a _

s-

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c..,..

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a.c s

00 11 s re :th :o:::ete.

The likelihood of de::icental alkali-silica e. a...a- '..'

a. b....=. ~. a.. o d... -"... '... o. c".. +.. 3.s c...s i.' e. e

n. e,el 4.r i'o l e u

i d

sic:e ~.cv-alhali per-land ce en vas used in this ccacrete.*

This level 4..

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4.

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a.'

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13.

Ne::her the s::othed ne: -he acid-e:ched surf aces of concrete f rc:

)

c.e.s

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c.. e :.

c.. y c.,.. o _.. :., <.... a.. y e <.. n e.,

sa,.,e.

m i.

E 14.

T'.in s e::ic a a::2 r.ina t icn s.

The exanination ef the 5 pairs of l

thin sec:ic.s represen:ing low-a.3 nor:al-s::ength concrete did no:

reveal signifi:at: dif f ere.:es nor did :he examination of the other 31

. < _ s ; 4.e.,. n.

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15.

The ty;ical thin sec:icn indicated a dense, well consolidated concrete

[.

ade v-ith a :anona:e cearse ag;:egate, a natural sand, and portland cement.

E i

No ainix.ures such as fly ash were recognized.

The paste was a cix:ure of v.. ; a. o.. < > e, a > u n..,y c a e 3 c e e...

,... < n s u

s..<..

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acate hyc. r...

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,n a: s ee ed c be appropr, ate.,: arount.

2 ne calcium s:.,.

r a t e :.s not specifically recognizable by examination of thin sections of contrate r

althou4-h its prese:::e is readily inferred.

The comparative exami. nations E...

e-did no: sugses: different amounts of cement or of water between the r

i di.'fere.: sz.les.

Se e of the thin sections vere carbonated, or small

[

areas were tissing, or the ep:xy resin was con:acinated with c:all crystals 5.,

hat crystallized f:c: the resin.

These def ects are concen, are no 1

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FOA. Constructica Technology Laboratories petrographic report dated

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27 Feb ta y 1979, proj ect CT-0407.

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1521 C 655-77, " Standard Rece r. ended Prac: ice for Petrographic D

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