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Concrete Cutting One
1257 Worcester Rd, Unit 114
Framingham, MA 01701

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Concrete Cutting Coring Westborough MA Mass Massachusetts

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“We Specialize in Cutting Doorways and Windows in Concrete Foundations”

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We Perform Concrete Cutting, Sawing, Core Drilling and Coring in Westborough.

The ordinates of the lower diagram represent the absolute volumes (volumes of solid matter) of the ingredients in a unit volume of freshly mixed concrete. The 1:1: 2 mixes, for example, is seen to consist of 66 per cent concrete aggregate, 16 per cent cement and 18 per cent total water, and the 1:3:6 concrete, at the opposite side of the diagram, of 76 per cent concrete aggregate, 6.7 per cent cement and 17.3 per cent total water. These figures ignore the small air voids that are apt to occur, as in these mixes they are negligible. For mixes of stiffer consistency or with a very high proportion of fine concrete aggregate, the air voids might be of such magnitude as to require their inclusion. This matter of air voids will receive separate consideration later in the text. In the upper diagram the concrete paste alone has been analyzed in the same manner as the concrete in the lower portion.

Thus, the ordinates represent the absolute volume
of the cement and water in a unit volume of the paste. For example, the 34 per cent of paste in the 1: 1:2 mixes is now represented as 100 per cent, of which about 47 per cent is cement and the balance water. It will be noted in both portions of Fig. 1 that the water is divided into combined and uncombined. This shows graphically the two-fold part which the water plays in concrete mixtures. The amount of water which can go into combination with the cement is brought out later. It can be stated here that were there only sufficient water for the chemical combination, the concrete would be wholly unworkable. It is significant that this extra water, which makes possible the effective and economical use of concrete, also introduces most of the difficulties encountered in its use. A noteworthy feature of the lower diagram in Fig. 1 is the relative quantity of concrete aggregate, cement, and total water (combined and uncombined) for the different mixes. It will be seen that the total quantity of cement and concrete aggregate is quite uniform in the five mixes, leaving approximately the same total quantity of water in the various mixes. Stated otherwise, this means that in order to produce a fixed consistency (3 to 4-in, slump in this case) about the same total amount of water is required per unit volume of concrete for rich and lean mixes alike This shows the intimate relation between cement quantity and water ratio.

The foregoing statement applies to Fig. 1 in which the volume of concrete is the same for the different mixes. The same thought can be expressed differently if the quantity of concrete aggregate remains fixed. For this case, and with the proportion of fine to coarse concrete aggregate remaining unchanged, any change in the quantity of cement must be offset by a change in the water quantity to maintain constant consistency. Thus, increasing the cement quantity permits a reduction in the water quantity, or a reduction in cement quantity requires an increase in the amount of water. This explains why lean mixes require more water per sack of cement than rich ones for workability. This whole matter is of great importance and will be more fully considered later. The most significant relation exhibited by the lower diagram of Fig. 1 is the proportion of combined and uncombined water with respect to the other elements of the mix. The quantities of combined water which were plotted in the diagram are those which would exist at one particular age and under a particular set of curing conditions. The quantity of combined water may vary over a wide range, being influenced by the fineness and composition of the cement, the quantity of water mixed with the cement, the age and curing conditions. Water which remains in the concrete in some degree of fixity at one temperature and humidity passes off readily at some higher temperature or lower humidity give some data from studies by Raymond Wilson now under way in the Research Laboratory of the Concrete with Portland cement Association, showing a possible range in the amount of combined water.

Are You in Westborough Massachusetts? Do You Need Concrete Cutting?

We Are Your Local Concrete Cutting Company

Call 508-283-3135

We Service all surrounding Cities & Towns.