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TECHNICAL SPECIFICATIONS

The NTP

400,011 defines crushed stone as coarse aggregate obtained by artificial crushing of rocks or gravel.

coarse aggregates must meet the following specifications:

- It shall be composed of particles clean, preferably angular profile of , hard, compact , resistant, and preferably texture rough.
- particles should be chemically stable and must be free of scale, dirt, dust, silt, humus, surface deposits, subject organic salts or other harmful substances.
- It is advisable to take into consideration the following: According NTP400.037 or ASTM C33
1) The particle size selected should preferably be continuous.
2) The particle size selected should allow the highest density of concrete with adequate workability and consistency in terms of placement of the mix.
3) The selected particle size should not exceed 5% of the aggregate retained on the mesh of 11 / 2 "and no more than 6% of the aggregate passing the mesh of ¼".

- Design Standards Structural recommend that the maximum nominal size of coarse aggregate is the highest that can be economically available, provided that it is compatible with the dimensions and characteristics of the structure. It is considered that in any case the nominal maximum aggregate size should not be greater than:

1) One-fifth of the smallest dimension across flats of formwork, or
2) One third of the depth of slabs, or
3 ) Three-fourths of the minimum space between individual bars or wire reinforcements bar packages, strands, or prestressed pipeline.
In items reduced thickness, or in the presence of large amounts of armor; may be authorized by the Inspectorate to reduce the nominal maximum size of coarse aggregate, while retaining adequate workability and required to comply with the settlement, and to obtain the properties specified for concrete.

- The percentage of particles in the coarse aggregate disadvantages must not exceed the following values:
· Clay ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 0.25%
· Particles despicable ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. ... .5.00% thinner
· Material passing No. 200 mesh ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. 1.00%
· Coal and lignite:
1) When the concrete surface finish is important. ... ... ... ... .. 0.50%
2) Other concrete ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... ... ... ... ... ... ... .. ... ... ... ... 1.00%

The coarse aggregate particles whose harmful exceed limits specified above, may be accepted provided that a concrete made with aggregate from the same source, has given satisfactory service that has been exposed in a manner similar to the study, or in the absence a record of services provided that the concrete prepared with the addition has characteristics satisfactory when tested in the laboratory.

- The coarse aggregate used in concrete pavements, structures subjected to erosion, abrasion or cavitation, it should have a greater than 50% loss in the abrasion test conducted according to NTP 400,019 NTP or 400,020, or to the Standard ASTM C 131.

- Washing of the coarse aggregate particles should preferably be done with potable water. Otherwise, water must be free of salts, organic matter or suspended solids.

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COLLECTION TYPES AND USES

Types:
3 / 8 " are found in rocks of andesitic type. It is used in the manufacture of blocks and other precast elements.
1 / 2" - 3 / 4 " rocks are found in dolomitic limestone type, andesite and basalt andesítico.Es the most common and is used in concrete normal resistance to compression and in the manufacture of tubes and mixed.
1 "- 1 1 / 2" are found in dolomitic limestone rock type, basalt andesite and andesite. It is used in high strength concrete and special concrete flexural strength.

Applications:

is used as appends to the concrete: it binds to a paste (portland cement and water) to form a dough like a rock because the paste hardens due to chemical reaction between the cement and water.

constitutes approximately 60 to 75% of the total volume of concrete , so your selection is important: You must have an adequate strength and resistance to exposure conditions nterperie not contain materials that could cause concrete deterioration , as its function in concrete is to create a rigid skeleton stable and what is achieved by attaching it with cement and water.

How much stone was used in a mixture depends on the strength that is required at the end. An example: if you use stone 1 1 / 2 inches and you want high-strength concrete (about 300 kilos per square centimeter, three times for mortar for floors and walls) for each sack of cement to use a water bottle , 2 1 / 3 cans sand and 4 3 / 4 stone boats.

The stone absorbs moisture, so if the humidity is lower than the absorption, more water should be added to concrete, to compensate. It should also be free of organic matter, foreign matter and hazardous materials, which affect the quality of concrete.

is important ongoing verification of the quality of this aggregate to keep a lid on water demand and the homogeneity of the mixture.

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The crushed stone are materials extracted from quarried stone, crushed or processed, ball stone or boulder, which include particles sizes from about 5 mm up to 6 inches for larger fragments. For properties, it is necessary that the stones come from durable materials, resistant and mechanically strong, free of contaminants or harmful particles affecting the setting of concrete.

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INTRODUCTION DEFINITION AND FEATURES

The crushed stone is an igneous rock : formed by the cooling and solidification of molten rock material, known as magma, is composed almost entirely of silicates.

For its size, pidras range from very small ( 3 / 6 to 3 / 8 inch) to extra large stones (3 to 6 inches).

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As for the visit I made to the Faculty of Education at San Marcos, on June 21, 2008, where the company SERVIUNI (service company that supports business activities the areas of sanitation, energy, construction and transport, supported by the UNI), is working on the construction of a new building for academic and administrative environments, consisting of four levels in an area of \u200b\u200b350m2, with an investment
of soles 1650000 , is that I will be about building material: OR CRUSHED STONE CRUSHING , which is a very important aggregate for concrete constitution, and today it is known that physical, chemical and mechanical properties of aggregates, have a decisive influence on concrete properties. Not only in the finish, final quality, workability and consistency to the plastic state, but also in durability, strength, elastic properties, thermal change in volume and unit weight of hardened concrete. In general, the aggregates is central to the characteristics of density, strength, porosity and particle volume distribution in the two states.

Thereafter other entries will deal with their origin, formation, characteristics, production process, types, uses, etc.

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Figs and their property

Both fresh and dried figs are an important natural source of energy, they contain no fat or cholesterol, and sodium, however abundant they are in much-needed fiber among other things to decrease heart problems home, thanks to its high polyphenol content.
Its nutritional properties are healthy it is essential to incorporate the usual diet of children, the elderly, pregnant women and athletes, given their large contribution of energy and fiber content is highly effective in intestinal problems, including its potassium content , iron and vitamin C. which makes the figs are an inexhaustible source of nutrients very beneficial to the organism in general.
Fresh Figs: the fruit is composed of 80% water and 12% sugar, is ideal because it is consuming very mature tract, because it contains a substance called cradina, found in certain quantities of citric acid, pentonasa acid, malic acid and fat acético.Su is minimal as in proteins, but instead provides water, minerals and fiber in significant quantities. Dried Figs
: its nutritional duplicated when dry, incorporating the body a very important nutritional value due to the dissected loses water, some vitamin C and A, boosting the rest of the nutrients, including sugar takes more consistency and provides the added glucose, sucrose and fructose. Contributions and benefits
:
is recommended for respiratory problems, sore throat, bronchitis, colds and coughs. It also contains a fiber called lignin very effective in correcting disorders of bowel or chronic constipation.
It is high in calcium, this mineral is essential for human bone formation, also increases the density and facilitates the proper development of bones.
It is also rich in iron that is very helpful for people with anemia or problems caused by cramps. It also contains BAENZALDEHYDE which acts as an anticancer agent. Facilitates slow digestion problems because it has enzymes and flavonoids that support the digestive process considerably.
Figs have a high concentration of polyphenols that fight the risk of cardiovascular disease.
Due to the large amount of carbohydrate is an important source of energy, and calcium that has has some similarity to that of milk. They are very effective when you have mouth sores, wounds, ulcers, etc.
The FIG also has laxative and diuretic qualities for being a natural product is recommended to be consumed by children, adults, elderly, pregnant women, students and for those doing physical activities ..
They are high in sugar, 250g of fruit provide 1300 calories and 12g of protein, they also have vitamins A, B1, B2, B3, C, calcium and iron.

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PEACH PEAR

Eat fresh peaches helps tune the nervous system act as harmonic on organismo.Con leaves and flowers of the peach plant are medicinal teas or infusions in many cases. Just a matter of knowing on which it applies.
peach leaves and flowers are diuretic are purgative. Also make a tea with peach blossoms is very suitable for when you are going through moments of great anxiety or nervousness, it acts as a mild pain reliever.
is good for the following diseases: cancer ulcers, constipation, bladder problems, urine, blood, stones or kidney stones, gravel, rheumatism, pain from bone problems, arthritis, osteoarthritis, rheumatism, obesity, whooping cough , herpes.
Dried fruits can be used to promote normal bowel function, either by eating alone at night or preparing a sweet tea (compote) with them and drink the resulting water and boiled fruit.

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PLUM Properties Properties Properties

The pears are perhaps the most delicious call "water." All varieties, however, are excellent to facilitate good digestion. Already popular saying goes: "Pears, as you want." If ripe, never hurt, even if creak a little bite, can be somewhat indigestible.
PropiedadesNo is essentially nutritious fruit, although it contains pectin and tannin, which makes it ideal for small c stomach, and has lots of mineral salts , including arsenic, phosphorus and sulfur and iron, calcium , sodium and magnesium .
Because of its natural sugar content, fruit is "appropriate for diabetics. It is also diuretic, laxative and revitalizing minerals, and is indicated in cases of rheumatism , gout and anemia .
There is a so-called "cure pears during which recommends eating up to a kilo per day before meals.

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The prunes have more nutrition than natural, because these increase as the drying process makes the water fall and focus more components naturales.Entre the advantages of their use, are the following: - Prevents and combats constipation and other bowel disorders .- Helps reduce cholesterol blood .- have a positive effect on bile acid concentrations in stool, preventing colon cancer .- contain copper which reduces the risk of blood clots in the blood .- contain boron, which helps women to retain postmenopausal estrogen, a hormone necessary for the absorption of calcium .
Like plums have very little fat and have high calorific by carbohydrates that provide energy much more profitable because more time is maintained in the body. However
and therefore, eating plums raisins dried in large quantities can promote weight gain , intestinal gas and flatulence , so it is recommended to be consumed in small amounts every day.
For people who do heavy physical work and for the athletes, the prune helps more energy, like schoolchildren, so they can learn better.
The nutrition of plum happens, are enormous, is proven to be fruit which contains more antioxidant compounds, surpassing raisin grapes, blueberries, blackberries, strawberries, plums, oranges, grapes, cherries , kiwi and grapefruit .
contains a large quantity of potassium, which helps to remove body fluids and avoids the problem of fluid retention in addition to protecting against cardiovascular problems.
The absence of fat, its rich fatty acids and high in potassium is very important for the treatment of hypertension arterial.También contain fiber, phosphorus, iron , sodium, magnesium, water, calcium, copper, zinc, selenium , vitamins A, C, B1 , B2 and niacin.
Its high fiber content, prevents constipation, intestinal obstruction and diverticulitis, especially when consumed in juice.