Cmu block weight

Many of these attributes are measured quantitatively, and cmu block weight vary directly with the weight of the concrete masonry wall. Additional wall properties are also impacted by wall weight, although estimates of these properties are based on concrete density or aggregate type, rather than directly on wall weight, cmu block weight. Examples of these properties include:. Tables 1 through 8 list concrete masonry wall weights for 4 to 16 inch to mm thick single wythe walls.

The versatility of concrete masonry as a construction assembly is well established through the variety of applications and structures it is used to create. Concrete masonry offers almost limitless combinations of color, shape, size, strength, texture, and density. Although most of the following discussions use lightweight and normal weight concrete masonry as examples, the properties of medium weight masonry can typically be expected to fall between the two. Note that while some of these density-related properties, such as sound transmission loss, may be directly referenced in building codes such as the International Building Code ref. In production, the density of a given concrete masonry unit is controlled in part by the methods used to manufacture the unit, but largely by the type of aggregate used in production.

Cmu block weight

Standards applicable to cmu contain three classifications of weight, expressed in pounds per cubic foot: Normal Weight, Medium Weight, and Lightweight. Normal Weight is lbs. Medium Weight is less than to lbs. In addition to precision and split face gray, a scored split and standard color are normally available. Lightweight is less than lbs. Normally stocked in selected sizes in gray. Note: both Medium Weight and Lightweight units are made with "Lightweight" aggregates. To specify a cmu solely on the statement that it be made with Lightweight aggregates does not provide adequate definition. Of the three weights, Normal Weight is the least expensive and Lightweight is the most expensive. Medium Weight is most popular and therefore has greatest availability for structural applications as its moderate weight and cost generally offer the best labor production to material cost ratio. For example weights per units and wall area, please see charts in Technical Articles, Average Weights. Contact Us. Weights of CMU.

Painting or pureitwater the surface of the concrete masonry assembly reduces the NRC for both lightweight and normal weight concrete masonry. Thermal resistance, with lower density walls providing higher R-values and potentially better energy performance, cmu block weight. Through the use of cmu block weight aggregates, normal weight aggregates, or blends of lightweight and normal weight aggregates, the resulting density of concrete masonry units can be varied by the producer to achieve one or more desired physical properties.

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Many of these attributes are measured quantitatively, and often vary directly with the weight of the concrete masonry wall. Additional wall properties are also impacted by wall weight, although estimates of these properties are based on concrete density or aggregate type, rather than directly on wall weight. Examples of these properties include:. Tables 1 through 8 list concrete masonry wall weights for 4 to 16 inch to mm thick single wythe walls. Wall weights for grouted 4-in. NCMA and the companies disseminating this technical information disclaim any and all responsibility and liability for the accuracy and the application of the information contained in this publication.

Cmu block weight

Concrete blocks, also known as Concrete Masonry Units or CMUs, provide very durable structural and non-structural partitions. They are generally used as a backup wall that gets covered with a finish material or exposed in utilitarian spaces like mechanical rooms or basements. They can be painted to provide a cleaner finish, but they are also manufactured with different finishes that help improve the aesthetic quality over the traditional gray CMU. As with brick , CMUs have actual dimensions and nominal dimensions. The nominal dimension of a CMU is the actual dimension plus the width of the mortar joint. The nominal dimension works within the 4" grid that other construction materials follow. The graphic below shows the difference between nominal and actual sizes.

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Hence, while increased structural dead load increases seismic design forces, it also concurrently helps to resist wind loads. Reducing the weight of a structure or element also reduces the seismic load a structure or element must be designed to resist, because the magnitude of seismic loading is a direct function of dead load. In general, 8-in. Wall weights are used directly to calculate: Sound transmission class STC ratings, with heavier walls providing higher STC ratings and hence better sound insulation. Weights listed in the tables are based on the following assumptions. Assuming a similar surface texture and coating, a concrete masonry wall constructed with lightweight units will have a higher NRC than a companion wall constructed with normal weight units, due to the larger pore structure often associated with lower density units. Figure 2—Calculated Fire Resistance Ratings. Through the use of lightweight aggregates, normal weight aggregates, or blends of lightweight and normal weight aggregates, the resulting density of concrete masonry units can be varied by the producer to achieve one or more desired physical properties. National Concrete Masonry Association, Regardless of unit density, all loadbearing concrete masonry units meeting the physical properties of ASTM C90 ref. In general, for a given concrete masonry unit mix design, higher compressive strengths can be achieved by increasing the unit density through adjustments to the manufacturing methods. These relationships are summarized in Figure 1. Of the three weights, Normal Weight is the least expensive and Lightweight is the most expensive.

Standards applicable to cmu contain three classifications of weight, expressed in pounds per cubic foot: Normal Weight, Medium Weight, and Lightweight. Normal Weight is lbs. Medium Weight is less than to lbs.

There is no excess grout in the wall. Many of these attributes are measured quantitatively, and often vary directly with the weight of the concrete masonry wall. Figure 2—Calculated Fire Resistance Ratings. In addition to precision and split face gray, a scored split and standard color are normally available. Conversely, increasing the density or amount of grout used in a concrete masonry assembly decreases its R-value ref. Several production variables can affect the void structure, including degree of compaction, water content of the plastic mix, and aggregate gradation. Except as noted in Table 2, units have nominal face dimensions of 16 in. Note: both Medium Weight and Lightweight units are made with "Lightweight" aggregates. While the absorption values are not directly related to unit physical properties such as compressive strength and resistance to mechanisms of deterioration such as freeze-thaw, they do provide a measurement of the void structure within the concrete matrix of the unit. However, with respect to unit appearance, any change in aggregates whether a change in source or a change in aggregate type used to manufacture a concrete masonry unit may change its color or texture, particularly for units with mechanically altered features such as split or ground-face surfaces. Back to TEK Resources. Concrete Facts, Vol. Each unit has square ends and two square cores, as shown in Figure 1. Navigate Section.