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STUDY ON CRUSHED SAND FOR CONCRETE
Conventionally concrete is mixture of cement, sand and aggregate. Properties of aggregate affect the strength and quality of concrete; thus fine aggregate is an essential component of concrete. The most commonly used fine aggregate is natural sand. Nowadays the development of infrastructures is becoming the number one priority in the world, particularly in the developing countries. So there are great demands within the construction industries for natural sand as fine aggregate used in the production of concrete. This has created a very difficult situation; the cost of natural sand has increased and also there is great fear from environmental list and ecologist that in the future there may be scarce of natural sand and the environment and the ecology will be distorted. Hence, the need to find materials which are affordable and available to replace natural sand in the production of concrete. One of these materials is crushed sand and this research studies its suitability as a fine aggregate. Crushed sand is a term used for aggregate materials less than 4.75mm and which are produced from quires stone crushed. Which is specially prepared so as to get smooth textured, well graded particles. Crushed stone sand is cheaply and easily available in local areas. [1] Conducted to study the influence that crushed sand has in bulking of sand, compressive strength of concrete, workability and Water absorption to compare the cost of different concrete mix and to assess the prospects of using crushed sand as replacement of natural sand in Ethiopia. Initially, different natural and crushed sand samples to be used in the concrete mixes were collected and their experimental studied. Concrete mixes having three mix proportions (were prepared for 20, 25 and 30 MPa) with natural sand and crushed sand. The mix is twenty-seven cubic cast for compressive strength test and twelve cubic casts for water absorption test. In addition, comparison of costs for selected concrete grade mixes based on the current price of the concrete material collected from Addis Ababa. In this study beginning of bulking of sand test. Bulking of sand Occurs due to the presence of moisture content in fine aggregate. Bulking of sand increase parentage, the moisture of sand increases and also the volume of sand Moisture content in sand expand the volume of sand. The results of crushed sand less bulking of natural sand. Workability was measured in terms of the slump cone and the results also all grades of concrete mix workability of natural sand great than with crushed sand. Additionally, the experimental results indicated that for all grades of concrete mix proportion, concrete with crushed sand was capable of achieving a higher compressive strength than the natural sand control mix. The water absorption test was conducted on concrete cube age of 7day and 28 days. Results indicated use crushed sand, concrete mix is great when compared to natural sand concrete mix. The cost comparisons result also have shown that using crushed sand in full replacement to natural sand doesn’t cause any significant cost variation. It has been found also that use of crushed sand is more suitable for high strength concrete production. It can therefore, be concluded from the findings of this research that when the availability of natural sand is scarcity in cities where the price of natural sand is as expensive as crushed sand, crushed sand concrete mix is an environmental and better alternative to the use of natural sand. The concrete with crushed sand performed better than concrete with natural sand as the property of crush sand is better than that of natural sand.
STUDY ON CRUSHED SAND FOR CONCRETE
Conventionally concrete is mixture of cement, sand and aggregate. Properties of aggregate affect the strength and quality of concrete; thus fine aggregate is an essential component of concrete. The most commonly used fine aggregate is natural sand. Nowadays the development of infrastructures is becoming the number one priority in the world, particularly in the developing countries. So there are great demands within the construction industries for natural sand as fine aggregate used in the production of concrete. This has created a very difficult situation; the cost of natural sand has increased and also there is great fear from environmental list and ecologist that in the future there may be scarce of natural sand and the environment and the ecology will be distorted. Hence, the need to find materials which are affordable and available to replace natural sand in the production of concrete. One of these materials is crushed sand and this research studies its suitability as a fine aggregate. Crushed sand is a term used for aggregate materials less than 4.75mm and which are produced from quires stone crushed. Which is specially prepared so as to get smooth textured, well graded particles. Crushed stone sand is cheaply and easily available in local areas. [1] Conducted to study the influence that crushed sand has in bulking of sand, compressive strength of concrete, workability and Water absorption to compare the cost of different concrete mix and to assess the prospects of using crushed sand as replacement of natural sand in Ethiopia. Initially, different natural and crushed sand samples to be used in the concrete mixes were collected and their experimental studied. Concrete mixes having three mix proportions (were prepared for 20, 25 and 30 MPa) with natural sand and crushed sand. The mix is twenty-seven cubic cast for compressive strength test and twelve cubic casts for water absorption test. In addition, comparison of costs for selected concrete grade mixes based on the current price of the concrete material collected from Addis Ababa. In this study beginning of bulking of sand test. Bulking of sand Occurs due to the presence of moisture content in fine aggregate. Bulking of sand increase parentage, the moisture of sand increases and also the volume of sand Moisture content in sand expand the volume of sand. The results of crushed sand less bulking of natural sand. Workability was measured in terms of the slump cone and the results also all grades of concrete mix workability of natural sand great than with crushed sand. Additionally, the experimental results indicated that for all grades of concrete mix proportion, concrete with crushed sand was capable of achieving a higher compressive strength than the natural sand control mix. The water absorption test was conducted on concrete cube age of 7day and 28 days. Results indicated use crushed sand, concrete mix is great when compared to natural sand concrete mix. The cost comparisons result also have shown that using crushed sand in full replacement to natural sand doesn’t cause any significant cost variation. It has been found also that use of crushed sand is more suitable for high strength concrete production. It can therefore, be concluded from the findings of this research that when the availability of natural sand is scarcity in cities where the price of natural sand is as expensive as crushed sand, crushed sand concrete mix is an environmental and better alternative to the use of natural sand. The concrete with crushed sand performed better than concrete with natural sand as the property of crush sand is better than that of natural sand.
STUDY ON CRUSHED SAND FOR CONCRETE
GIRMA HAILU (Autor:in) / Dr. Suresh Borra (Autor:in)
01.01.2018
doi:10.20372/nadre:1551000462.82
Hochschulschrift
Elektronische Ressource
Englisch
DDC:
690
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