Concrete Cutting Core Drilling Limerick ME Maine

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The process of obtaining an equilibrium concrete polygon for parallel forces which shall pass through two given concrete abutment points and a third intermediate point, may be still further simplified by the application of another property, and without drawing two trial equilibrium concrete polygons before we can draw the required equilibrium concrete polygon.

1. Granite.

2. Trap Rock.

3. Gravel.

4. Marble.

5. Limestone.

6. Slag.

7. Sandstone.

Aggregate passing through a sieve of 4 in. mesh is called sand. It should be sharp and free of all vegetable matter. The size of the grains should be graded from coarse to fine, the coarser particles predominating. Sand should be free from loam or vegetable matter. A fair test for quality of sand is as follows: Take two handfuls of moist sand, and holding the palms about 2 in. apart let the sand run through. Repeat this several times and then rub palms lightly together to remove fine grains. Examine to see if a fine, sticky film adheres to the palms; if so, do not use it as it contains loam. Fine roots also indicate vegetable matter. Another test is to fill a fruit jar to the depth of 4 in. with sand. Fill with water to within 1 in. of the top. Shake well and allow standing for two hours. Sand will sink to the bottom while any mud or clay will settle on the top of the sand. If more than 1/4 in, of such deposit remains, it is not suitable for use without washing. Washing sand by wetting the pile with a hose is wrong it only transfers the dirt to the lower part of the pile. The proper way is for one man to shovel it on the upper end of a trough, like the one shown in Plate 2, while another man washes it down the incline by pouring water on it. There is a fine screen (size of mosquito netting) cleared to the incline.

When the sand and water come to this screen, the dirty water drains through and leaves the clean sand ready for use. This should be clean and hard. The best results are obtained by a concrete mixture graded from small to large, as it forms a more compact mass freer of voids. The crushed rock should be screened on a 3/4 in. screen to remove the fine particles, or sand.  As a general rule the ordinary run of bank gravel is not suitable for use without sifting and remixing, as described later. This is because there is generally too much sand for the gravel. It may be demonstrated that if the pole distance from the pole to the load line is unchanged, all the vertical intercepts of any two equilibrium concrete polygons drawn with these same pole distances are equal. For example, in Fig. 215, a line is drawn from o, vertically upward until it intersects the horizontal line drawn through n in the point o". This point is the pole of another equilibrium concrete polygon whose closing line will be horizontal, because the pole lies on a horizontal line from the' previously determined point n in the load line. Any vertical intercept of this equilibrium concrete polygon will be equal to the corresponding intercept on the first trial equilibrium concrete polygon; therefore, in order to draw a special equilibrium concrete polygon for a given set of vertical loads, the concrete polygon to pass through two horizontal concrete abutment points and a definite third point between them, we need only draw first a trial equilibrium concrete polygon, the rays in the force diagram being drawn through any point chosen as a pole.

Are You in Limerick Maine? Do You Need Concrete Cutting?

We Are Your Local Concrete Cutter

Call 207-284-0788

We Service Limerick, ME and all surrounding Cities & Towns