Concrete Cutting Cutter Boxford MA Mass Massachusetts

Welcome to AffordableConcreteCutting.Com

�We Specialize in Cutting Doorways and Windows in Concrete Foundations�

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

We Are Your Local Concrete Cutter

Call 800-799-9151

We Service Boxford MA and all surrounding Cities & Towns

�No Travel Charges � Ever! Guaranteed!�

Concrete Cutting Boxford MA �� Concrete Cutting Boxford Massachusetts

Concrete Cutter Boxford MA�� Concrete Cutter Boxford Massachusetts

Concrete Coring Boxford MA �� Concrete Coring Boxford Massachusetts

Core Drilling Boxford MA�� Core Drilling Boxford Massachusetts

Concrete Sawing Boxford MA�� Concrete Sawing

Concrete Cutting MA �� Concrete Sawing Boxford Mass

Concrete Cutting Boxford Mass �� Concrete Cutting Boxford Massachusetts��

Concrete Cutter Boxford Mass�� Concrete Coring Mass��

Core Driller Boxford MA�� Core Drilling Boxford Mass��

Boxford Massachusetts Concrete Cutting and Core Drilling

For maximum density the interstices or voids between the stones forming the coarse aggregate should be completely filled by the fine aggregate, and all remaining voids by the cement paste, which also, if it is to perform its function as a glue binding the whole mass together, must coat completely every particle. Practically never, however, is the cement content determined by study of the voids in either the fine aggregate or in the combined aggregate. Instead the cement is made to bear that ratio, to the total aggregate which experience has proved to be sufficient for ensuring the desired strength. The strongest possible concrete with the given material and assumed cement-aggregate ratio is then assured (assuming the theory and method to be correct) by taking slightly more than enough fine aggregate (5 per cent to 10 per cent excess) to fill the voids in the coarse aggregate, this excess being necessary because the measured voids are increased by the wedging apart of the stones by the mortar.

16. Arbitrary Proportions. Measurements show that much of the aggregate in everyday use contains approximately 50 per cent of voids. This early suggested the simple 1 to 2 ratio of fine and coarse aggregates which is so commonly used. The cement is combined in the proportions which tests have seemed to show necessary for obtaining the required strength, for example, 1 part cement to 412 parts of fine and coarse aggregates, measured separately, for a strong concrete for columns, a mix usually expressed as 1-1-3. Most of the concrete in this country has been mixed in such proportions as 1-2-4, 1-3-6, etc., as fixed by ordinary practice and usage. Where good judgment has been shown in choice of aggregates and in workmanship the result has been good sound concrete. To speak of these proportions as Arbitrary is something of a misnomer. It would be more accurate to speak of proportioning by the Assumption of Average Void Conditions. Obviously when the aggregates vary much from the assumed average, as when they are poorly screened and there is considerable overlapping of sizes, the resulting mixes will be unsatisfactory. Where a job is large enough to support laboratory tests more careful proportioning will unquestionably result in stronger and more economical concrete. Furthermore, aggregates of unknown quality not only should be tested before being used as described above (Arts. 9-10) but also they should be subjected to a screen test before deciding on proportions for work of any importance.

17. Mechanical Analysis. In 1907 William B. Fuller and Sanford E. Thompson made public 1 a method of combining various aggregates to give the densest mixture by means of sieve analyses of the materials. The grading of any aggregate may be recorded graphically by a curve as in Fig. 1, the abscissa of any Diameters of Sand in Inches point indicating the size and the ordinate indicating the percentage of the material finer than that size. Messrs. Fuller and "The Laws of Proportioning Concrete," Transactions Am. Soc. C. E., Volume LIX, page 67, 1907. A full description of this method is given in "Concrete, Plain and Reinforced," 3rd Edition, Taylor & Thompson.��

Thompson showed that when any concrete aggregates are combined so that the resulting mixture is the densest possible for that material, the grading curve for that mixture is, very closely, the combination of a straight line and an ellipse. Furthermore they showed "that a curve of substantially the same form would fit different materials� and save data for constructing this maximum density curve for a variety of aggregates: crushed rock, gravel and sand. Knowing thus the ideal curve, any given aggregates may be analyzed, their grading curves plotted and, by cut and try methods, and the proportions determined that will result in the curve most closely approximating the ideal.