Which bag of portland cement does a job actually need? The powder looks the same, yet one type resists sulfate and another gains strength in days. The right choice starts with the exposure, not the color.
The cement industry body lists four basic portland cement types under ASTM C150: Type I for general use, Type II for moderate sulfate resistance, Type III for high early strength, and Type V for high sulfate resistance. The standard also defines a historical low-heat Type IV. Match the type to the exposure, then check local availability.
What Are the Main Types of Portland Cement?
Portland cements are made to meet ASTM C150, the Standard Specification for Portland Cement. The cement industry body (cement.org) states that the four basic types are Type I, Type II, Type III, and Type V. The standard also defines a Type IV, covered further down as a historical low-heat cement. All of them start the same way: a plant grinds kiln-fired clinker with gypsum into the fine powder (how cement is made, accessed 2026-10-21).
Each type is still portland cement. The difference is in its properties, such as sulfate resistance or how fast it gains strength. To picture how a property points to a type, see the routing map below. Once you know the type, our cement bag calculator handles the quantity side.
What Each Type Does, Type by Type
Here is the plain version: Type I for general work, Type II for moderate sulfate, Type III for speed, and Type V for severe sulfate. The table pulls the key property and the main uses straight from the cement industry body’s descriptions.
Type I is the general-purpose cement, suitable where no special property is needed. Its listed uses include pavements, floors, reinforced buildings, bridges, tanks, reservoirs, pipe, masonry units, and precast products. Type III delivers high early strength, so design strength can arrive in days instead of the typical 28.
| Type | ASTM C150 | Key property | Typical use | Availability note |
|---|---|---|---|---|
| I | Type I | General purpose | Pavements, floors, reinforced buildings, bridges, tanks, pipe, precast | Type I/II is the most widely available |
| II | Type II | Moderate sulfate resistance | Soil, seawater or ground water with higher-than-normal sulfate | Commonly sold as Type I/II |
| III | Type III | High early strength | Early form removal, fast return to service, cold weather, precast | Check local availability |
| IV | Type IV | Low heat of hydration | Massive pours such as dams (historical) | Rarely produced today; see below |
| V | Type V | High sulfate resistance | Severe sulfate soils or groundwater | Gains strength more slowly than Type I |
Type I/II is a dual designation. It simply means the cement meets the requirements of both Type I and Type II. The cement industry body states that Type I/II “has been the most widely available in the United States”, which is why many bags on a shelf carry that label.
Sulfate Exposure: When You Need Type II or Type V
Sulfate resistance is the main reason to step up from Type I. Type II handles moderate sulfate, and Type V handles severe sulfate. Sulfates in soil or water can react with the cement and cause expansion, scaling, and cracking, so the exposure drives the choice.
The cement industry body puts it in plain bands. Type II suits soil, seawater, or ground water where sulfate is higher than normal but not severe. Type V is for severe sulfate environments, chiefly high-sulfate soils or groundwater. The cement industry body notes it “tends to gain strength more slowly than Type I cement”. The ladder below shows the idea without code numbers.
One caution from the same source: even Type V cannot withstand severe sulfate if the concrete has a high water-to-cementitious ratio. Portland and portland blended cements also resist acids poorly. For the water side of a mix, see how much water per bag of concrete.
Type III, the Historical Type IV, and Blended Cements
Beyond the sulfate pair sit the speed, the heat, and the blends. Type III is the high-early-strength cement, Type IV is the historical low-heat cement, and ASTM C595 covers blended cements like Type IL. Each still starts from portland cement.
Type III reaches design strength fast. The cement industry body gives an example: design strength “in a matter of days as compared to the typical requirements of 28 days”. That speed helps with early form removal and cold-weather work. The schematic below shows the gap, not to scale.
Type IV is the low-heat-of-hydration cement. It was used historically on massive pours, such as Hoover Dam in 1935, to control temperature rise. It is not among today’s four basic types. The cement industry body notes that broad use of low-heat cements has since generally been replaced with supplementary cementitious materials (SCMs) such as fly ash. Treat Type IV as a historical aside, rarely produced now.
Two more variants round out the shelf:
- Air-entraining IA, IIA and IIIA. These correspond in composition to Types I, II and III, with air-entraining additions interground during manufacture. Most air entrainment today uses an admixture added at the batch plant, not air-entraining cement. Check local availability before specifying one.
- Blended cements (ASTM C595). These intergrind portland cement with materials like limestone, slag, or pozzolans. Type IL is the general-purpose blended designation. A blended cement is a different standard from the ASTM C150 types above.
Choosing a Type Is Not the Same as Counting Bags
The type is a separate decision from the quantity. A bag calculator counts 94 lb bags of portland cement powder for a mix ratio; it does not ask which type you bought. You pick the type from the exposure, then size the bags.
Take the cement calculator’s default as a worked example: 1 cubic yard of a 1:2:4 mix. The figures below are arithmetic from the tool’s method.
- Find the dry volume. 1 cubic yard is 27 cubic feet. With the standard 1.54 dry factor, 27 x 1.54 is 41.58 cubic feet of dry material.
- Take the cement share. A 1:2:4 mix is 7 parts, so cement is 1 of 7. That is 41.58 / 7, or 5.94 cubic feet of cement.
- Turn it into bags. At about 1 cubic foot per 94 lb bag, 5.94 cubic feet is about 6 bags with no waste. The tool’s default 5 percent waste makes it 27 x 1.05 x 1.54 / 7, or 6.24 cubic feet, which rounds up to 7 bags.
Separately, the QUIKRETE Portland Cement No. 1124 data sheet lists a 1:2:3 concrete mix. It says “five to six 94 lb” bags typically make 1 cubic yard of concrete. The sheet describes the product as a portland cement meeting ASTM C150 or ASTM C595, and its pictured bag is labeled Type I. Both routes count portland cement bags regardless of type. That is the point: the type and the bag count are two different questions.
For the buy-or-batch side, compare ready-mix vs bagged concrete, and for sizing a whole pour, use the concrete volume and ordering calculators.
Once you have chosen the portland cement type, estimate the portland cement bags for your mix in seconds.
FAQs About Portland Cement Types
What are the main types of portland cement?
The cement industry body lists four basic types under ASTM C150: Type I for general use, Type II for moderate sulfate resistance, Type III for high early strength, and Type V for high sulfate resistance.
What is Type I portland cement used for?
Type I is the general-purpose cement for work that needs no special properties. Listed ASTM C150 uses include pavements, floors, reinforced buildings, bridges, tanks, reservoirs, pipe, masonry units, and precast concrete products.
What is Type II portland cement for?
Type II gives moderate sulfate resistance. The cement industry body recommends it where soil, seawater, or ground water carry higher-than-normal but not severe sulfate, and it is often used for seawater exposure.
What does Type III portland cement do?
Type III provides high early strength, so design strength can arrive in days instead of the typical 28. Crews use it for early form removal, fast return to service, and cold-weather concreting.
Is there a Type IV portland cement?
Yes. ASTM C150 defines a Type IV low-heat cement, used historically in massive pours like Hoover Dam in 1935. It is not among the four basic types today and has largely been replaced by supplementary cementitious materials.
What is Type V portland cement for?
Type V is for severe sulfate environments, mainly high-sulfate soils or groundwater. It resists more aggressive sulfate than Type II, and the cement industry body notes it tends to gain strength more slowly than Type I.
What does the Type I/II label mean?
A Type I/II label means the cement meets the requirements of both Type I and Type II. The cement industry body says Type I/II has been the most widely available portland cement in the United States.
Sources and Further Reading
References Used in This Article
- American Cement Association (formerly PCA), Types of Cement, accessed 2026-10-21.
- QUIKRETE, Portland Cement Product No. 1124 data sheet (rev. August 2022), accessed 2026-10-21.
- American Cement Association (formerly PCA), How Cement Is Made, accessed 2026-10-21.
This guide explains the ASTM C150 portland cement types using the cement industry body and a manufacturer data sheet. The type sets how the cement resists sulfate or gains strength, so match it to the exposure and check local availability. Reviewed for accuracy by Prof. Dr. Khalil Mudassar, PhD. Last updated 2026-10-21.
Shakeel Muzaffar is the Founder and Editor-in-Chief, with over 15 years of experience in digital publishing and online tool development. He oversees editorial quality and formula verification to ensure accurate, practical, and easy-to-use calculators.