We put the "ready"
in ready-mixed concrete
Troutdale Sand & Gravel Co
2205 NE 244th Ave.
Troutdale, OR 97060
PO Box 397
Troutdale, OR 97060
Phone: (503) 665-4121Fax:
Monday to Friday
8:00 AM – 5:00 PM
Seasonal Concrete Deliveries
Common Concrete Questions in Troutdale, OR
Frequently Asked Questions
Answers to Common Concrete Questions
Get quality building materials for your construction project. Learn more about concrete products
and other concrete-related topics from the concrete experts at Troutdale Sand & Gravel Co in Troutdale, OR.
1. What is concrete made of?Answer:
Concrete is the mixture that results from blending Portland cement, water, sand, stone, and admixtures.
2. How do you control the strength of concrete?Answer:
The easiest way to add strength is to add cement. The factor that mostly influences concrete strength is the ratio of water to cement in the cement paste that binds the aggregates together. The higher this ratio is, the weaker the concrete will be. Every desirable physical property that you can measure will be adversely affected by adding more water.
3. What is 3,000-pound concrete?Answer:
It is concrete that is strong enough to carry a compressive stress of 3,000 PSI at 28 days.
4. How do I know what strength (PSI) I need?Answer:
Strength is usually determined by compression testing and is expressed in Pounds per Square Inch (PSI). Here are some examples of common uses for different strength concretes. Note: These are not exclusive. Designers and structural engineers may specify different strengths for specialized construction projects.
- 2500 PSI can be used for fence posts, pole barn post holes.
- 3000 PSI is a standard multipurpose mixture for general use in construction. Commonly used for private sidewalks, patios, footings, and foundations.
- 3500 PSI can be used for footings, foundations, garages, driveways, hot tub pads.
- 4000 PSI is used for heavy use floor slabs such as shops, warehouses, or RV slabs.
- 5000 PSI and higher concrete mixes are normally used for specialized construction projects where high impact resistances, very low wear rates, or extreme conditions are expected.
5. How is concrete measured?Answer:
Ready-mixed concrete is sold by volume measured in cubic yards. A cubic yard is 3 feet long x 3 feet wide x 3 feet high.
6. How much area does one cubic yard cover?Answer:
One cubic yard will cover 162 square feet if spread 2 inches thick. One cubic yard will cover 108 square feet if spread 3 inches thick. One cubic yard will cover 81 square feet if spread 4 inches thick.
7. How do I know how many yards I need?Answer:Rule 324
(Length in Feet X Width in Feet x Height in Inches) Divided by 324 = Cubic Yards of concrete
Example 8' x 12' x 4" = 384 Divided by 324 = 1.185 Cubic Yards
(Length in Feet x Width in Feet x Height in Feet) Divided by 27 = Cubic Yards of Concrete
Example 8' x 12' x 0.333333' = 31.999 Divide by 27 = 1.185 Cubic Yards
8. How many yards can fit on your trucks?Answer:
Up to 10 yards.
9. How far can the chutes on your trucks reach? Answer:
10. What is “Slump”?Answer:
Slump is a measure of the consistency of fresh concrete.
11. How is slump measured?Answer:
Slump is measured using a right circular cone that is 12 inches high. The base of the cone is 8 inches in diameter and the top of the cone is 4 inches in diameter. The cone is filled with fresh concrete in three layers of equal volume. Each layer is stroked 25 times with a rod that is ¾ inch in diameter. The end of the rod is bullet shaped. After the cone has been filled and the concrete has been cut off level with the top of the cone, the cone is raised vertically allowing the concrete to fall or slump. The distance that the concrete falls or slumps from the original height is the slump of the concrete. Slump is measured in inches and is reported to the nearest ¼ inch.
12. What size are your ecology blocks?Answer:
2’x2’x3’ or 2’x2’6’
13. How much do the ecology blocks weigh?Answer:
2’x2’x3’ = 1750 lbs.
2’x2’x6’ = 3500 lbs.
Get cost effective concrete materials that help you save on construction labor and time. At Troutdale Sand & Gravel Co, we offer environment friendly and high quality products at prices you will surely love. Get one step closer to finishing your project by getting in touch with us. For more information regarding our concrete material pricing and delivery options, please call us at (503) 665-4121.
Concrete, Sand and Gravel Tips and Tricks in Troutdale, OR
High temperatures can accelerate slump loss
and can cause loss of entrained air. Temperature has a major effect on setting time of concrete which can cause it to set quicker. Here are a couple additives we recommend using to help slow the process.
This is a water reducing additive with features and benefits such as:
- Superior finishing characteristics for residential/commercial flatwork and formed surfaces
- Superior workability, pump ability and finish ability qualities even in concrete mixes containing low amounts of cementitious materials
- Compressive and flexural strength performance increased at all ages
- True mid-range water reduction (5-15%) and excellent performance across a wide concrete slump range, especially the difficult slump range of 5-8 in
- Significantly reduced placement and finishing time resulting in lower in-place concrete costs
- Improved concrete durability to damage from freezing and thawing
- Increase service life of concrete structures
This admixture retards setting time by controlling the hydration of Portland cement and other cementitious materials while facilitating placing and finishing operations.
Features and benefits are:
- Reduced water content required for a given workability
- Retarded setting time characteristics
- Improved workability
- Provides flexibility in the scheduling of placing and finishing operations
- Offsets the effects of slump loss during extended delays between mixing and placing
- Reduces waste associated with concrete washwater and returned concrete
- Increase strength – compressive and flexural
- Within normal dosage range, it will generally extend the working and setting times of concrete containing normal Portland cement, fly ash, slag cement and silica fume approximately 1 hour to 5 hours compared to plain concrete mixture. This depends on job materials and temperatures.
*Trial mixtures should be made under approx. job conditions to determine the dosage required.
PLACING AND CURING REQUIREMENTS FOR ALL PORTLAND CEMENT BASE PRODUCTS IN COLD WEATHER
Founded in 1904, the American Concrete Institute (ASI), is a leading authority and resource worldwide for the development and distribution of consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction and materials, who share a commitment to pursuing the best use of concrete.
ACI defines COLD WEATHER as “3 days of 40-degrees Fahrenheit or lower outside temperature”.
ACI Table 3.1 – requires that all Portland cement-based concrete products be produced during “Cold Weather”: at a minimum temperature of not less than 55-degrees F.
Concrete that will be exposed to little or no freezing and thawing in service or during construction, such as foundations and substructures, be maintained at a minimum temperature of not less than 55-degrees F for 2 days minimum.
Concrete that will be exposed to weather in service or during construction be maintained at a temperature of not less than 55-degrees F for 3 days minimum.This information supplied by:
Allan Kramer, BSIE, ASTM, ACE, CSI, ASCE
Technical Services Manager for Lehigh Northwest Cement Co.