Question

Concrete is required for an interior concrete column in a
commercial building in Corvallis, Oregon. A specified compressive
strength, f’_{c} , of 4000 psi is required at 28 days using
an ASTM C 150 Type I. The design calls for a minimum of 3 in. of
concrete cover over the reinforcing steel. The minimum distance
between reinforcing bars is 2.5 in. A slump of 4 inches should be
the target. No statistical data on previous mixes are available.
Follow mixture proportioning according to *Portland Cement
Association (PCA) - Design and Control of Concrete Mixtures,
Kosmatka and Wilson, 2011*, *16 ^{th}
Edition.*

**Materials Available:**

ASTM C 150 Type I/II Cement

Relative density of 3.15

Coarse Aggregate: well-graded ¾ in. maximum-size aggregate (MSA), local river gravel

Oven-dry specific gravity: 2.60

Absorption: 1.2%

Oven-dry rodded bulk density: 102.4 lb/ft^{3}

Moisture content of coarse stockpile: 3.0%

Fine Aggregate: well-graded, local natural sand

Oven-dry specific gravity: 2.55

Absorption: 2.0%

Moisture content of fine stockpile: 3.8%

Fineness Modulus: 2.60

**Determine:**

- The theoretical mixture proportions of all concrete
constituents (fine aggregate, coarse aggregate, water, cement,
chemical admixtures (if specified)) based on 1 yd
^{3}of concrete and remember this is based on oven dry aggregates.

Answer #1

A concrete mix design requires each cubic yard of concrete to
have 1800 lbs dry coarse aggregate (density 4400lb/yd3), 615 lbs
cement (density 5300lb/yd3), 320 lbs water (density 1680 lb/yd3),
and 6% air.
The available aggregates are: coarse aggregate with moisture
content of 3.0%, absorption = 1.7%, fine aggregate with moisture
content of 3.3%, absorption = 1.9%.
Calculate
a. Required weight of coarse aggregate
b. Required weight of fine aggregate (density 4250 lb/yd3)
c. Required weight of water

... 00 E H.W 1. Design concrete mix according to ACI
with volumetric equation, and calculate the quantities of concrete
ingredients for a slab and 5 bored piles (Show your results in a
Table). Average compressive strength required at 28 days = 35 N /
mm 'with Slump is (75-100). Dry rodded mass of coarse aggregate is
1600kg / m3. Fineness modulus of fine aggregate is 2.9. the
concrete will be exposed to mild waves of freezing and thawing. The...

From a field data,
Required compressive strength of an OPC air entrained concrete
column at a moderate exposure is 37±3
MPa. Determine the amount of the
ingredients in kg, per 1m3 of concrete: (a) water (b)
cement (c) percent air content (d) coarse aggregate (No need to
adjust moisture for coarse
aggregate):
Given,
Nominal maximum size of coarse aggregate is 25
mm
Bulk OD specific gravity of coarse aggregate is
2.64
Oven dry-rodded density: 1650
kg/m3
Fineness modulus...

Calculate the field weights of the ingredients for 0.039 m3 of
concrete by using ACI Method of Mix Design. Job specifications
dictate the followings:
Cement content: 300 kg/m3
w/c: 0.57 (by weight, from the strength point of view)
w/c: 0.53 (by weight, from durability point of view)
Fine Aggregate (SSD)/Coarse Aggregate (SSD)=0.45 (by weight)
Air Content: 1,30 %
For Fine Aggregate (Crushed): SSD Bulk Specific Gravity: 2.47,
Total Moisture: 5,0 % and Absorption Aggregate: 2,7
%.
For Coarse Aggregate (Crushed):...

) The following recipe was determined as part of a concrete mix
design:
Water-cement ratio:
0.48
Coarse
aggregate: 0.60
ft3 CA (bulk volume, dry-rodded) per ft3
concrete
Water requirement:
9.6 lbs/ft3 (before moisture corrections)
Air
content:
5.0% by volume
Assuming that the CA and FA to be used
in the mix are both at SSD, the moisture content of the CA is 0.5%,
the moisture content of the FA is 2.5%, the specific gravity of the
CA and FA particles...

Q2)What would be the maximum aggregate
size used for the given mixture properties by using
ACI Method of Mix Design. 28-day specified
concrete strength is 3bMpa, standard deviation is
choosen as 3.aMpa and it is required that no more
than 1 test result in 200 will fall below the specified
strength.
Project Title:Detoration of wood column of a
commercial building
Project summary:Wood deterioration at the lower
level of a heavy timber column, which supports five floor levels,
was remedied by...

Aconcrete mixture for a proposed building work is to be
designed. A characteristic compressive strength of 25 MPa with 5%
defective rate is specified for 28 days. The standard deviation may
be taken based on a compressive strength results on specimens less
than 20. A slump of 40 mm is required and the maximum w/c ration
and the minimum cement content allowed are 0.7 and 200 kg/m3,
respectively. The fine aggregate is uncrushed and the percentage
passing sieve 600 Micro...

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