STUDY OF CONCRETE COMPRESSIVE STRENGTH BY USING CALCIUM CARBIDE WASTE WASTE AS THE SUBSTITUTION OF CEMENT AND SAND GLASS AS SUBSTITUTION

1. Lecturer in Civil Engineering Program, Faculty of Engineering, University of Muhammadiyah Sumatera Utara. 2. Postgraduate Student in Civil Engineering, Faculty of Engineering, University of Muhammadiyah Sumatera Utara. ...................................................................................................................... Manuscript Info Abstract ......................... ........................................................................ Manuscript History Received: 17 January 2020 Final Accepted: 20 February 2020 Published: March 2020


ISSN: 2320-5407
Int. J. Adv. Res. 8(03), 706-715 707 Carbide waste and glass waste commonly encountered in daily life is still not a lot of utilization so that it becomes garbage piling up and be the source of the problem.Waste carbide is B3 waste originating from the welding industry, resulting from the reaction of water with calcium carbide then produce reactor gas acetylene, by attachment of Government Regulation No. 101 of 2014 regarding the management of hazardous and toxic waste carbide and glass waste included in the list of waste Hazardous and Toxic or B3.
Waste Calcium carbide has a chemical composition oxide (CaO), silica (SiO 2 ), iron (Fe), aluminum oxide (Al 2 O), and other chemical elements. It is known that the main elements forming the cement is calcium derived from limestone, So waste carbide is also a cement-forming material , Glass waste is waste that are produced from public life, glass waste every day increasing in volume since man much use of glass, some glass waste directly discharged into open land, it is certainly going to pollute the environment in view of the glass is a material that is difficult to decompose or be recycled naturally by nature (Suhartini, 2014), Therefore do an innovation to reduce waste glass, one of which utilize the existing glass waste as one of the concrete mix material. In this case the glass will be used as a partial replacement of fine aggregate in the concrete mix.

Literature:understanding Concrete:
Concrete is a mixture of Portland cement or other hydraulic cement, fine aggregate, coarse aggregate, and water with or without the added material to form a solid mass(SNI 03-2834-2000), The concrete-forming material is mixed evenly with the specific composition so as to produce a homogeneous mixture that can be poured into the mold to the desired shape. The mixture, when left to experience hardening as a result of a chemical reaction between cement and water that lasts for a long period or in other words the hard concrete mix will increase in line with age.

Waste Carbide:
Waste carbide is B3 waste originating from the welding industry, resulting from the reaction of water with calcium carbide then produce acetylene gas reactor. Technology and innovation as the development of concrete, carbide waste reduction solution that accumulate in the city of Medan is to conduct reuse (Reuse) that can be used as a building material construction material that is friendly to the environment. The goal is to reduce the B3 waste that can pollute the surrounding environment and realize sustainable development (sustainable construction).
Picture 1:-Waste carbide before and after processing.
Waste carbide used in this study is the result of a welder who then pulverized and sieved through sieve # 200

Waste Glass:
Glass is a chemical industry products most familiar with our daily lives. Glass is a substance created by the cooling of molten materials, not crystalline but remains in a hollow shape.
Many things that may potentially benefit from the use of glass as aggregate concrete,(Suhartini, 2014) among others: 1. Having a high level of durability, since glass is a material that does not absorb water.
2. Glass has a high resistance to abrasion and these characteristics are characteristics that are rare in other natural aggregate.

Data Analysis And Discussion:-Data Mixed Concrete:
In this case I will analyze the data that has been obtained as the research proceeds so obtained values of base aggregate examination results are listed in Table 3 below. These data can be used to design concrete mixes (Mix Design) with the required compressive strength of 25 MPa using a method (SNI 03-2834-2000).

Planning Results Mixed For The Test Objects:
Cement : Sand : Stone Broke : Water 2.37 kg : 3.16 kg : 6.36 kg : 0.90 kg Based on the above comparison obtained the amount of waste carbide 7% of cement weight of 0.165 kg, 10% calcium carbide waste of 0.237 kg. As for the glass waste sand 5% of the weight of 0.158 kg, 7.5% glass waste of 0.237 kg.

Compressive Strength Testing:
Testing the compressive strength of concrete is done when the concrete was 7 days, 14 days and 28 days, using a press machine with a capacity of 1500 KN, the specimen to be tested is a cylinder with a diameter of 15 cm and 30 cm high and the number of different test as many as 54 fruit, with the grouping of the test object in accordance with the variation thereof.Here are the results of compressive strength of concrete: Concrete Compressive Strength Normal: Table 4:-Results of normal concrete compressive strength test.

Data types Score
The specific gravity of fine aggregate 2.54 g / cm 3

Discussion:-
If we compare between the compressive strength of normal concrete with concrete using a mixture of 7% of waste carbide, carbide waste 10%, 5% glass waste, glass waste 7.5% and a combination of calcium carbide waste glass waste 10% + 7.5% for the concrete 7, 14 and 28 days, then we can see an increase or not, on the compressive strength of the concrete mix materials used at each percentage of variation.    From Figure 3 to Figure 5 it can be seen that the mixture of waste carbide variation of 10% of the most consistent increases, the percentage of 6.55% at the age of 7 days, amounting to 6.12% at 14 days, and amounted to 2.19% at 28 days of normal concrete, the glass waste mix variations optimum compressive strength is on a variation of 7.5%, amounting to 3.30% at the age of 7 days, amounting to 2.46% at 14 days of normal concrete, but at 28 days did not increase, but the value is still in accordance with the quality of concrete plans at 25 MPa. While the mixture variation combinations carbide waste glass waste 10% to 7.5%, an increase in the amount of 4.92% at the age of 7 days, amounting to 4.87% at 14 days, and 1.08% at 28 days of normal concrete.

Conclusion:-
From the research and testing of compressive strength of concrete ages 7, 14 and 28 days, it can be drawn several conclusions, among others: Based on the concrete compressive strength test data, waste carbide with a variation of 10% consistently increased, amounting to 6.55% at the age of 7 days, amounting to 6.12% at 14 days, and amounted to 2.19% at 28 days, at glass waste mix variations optimum compressive strength is on a variation of 7.5%, amounting to 3.30% at the age 715 of 7 days, amounting to 2.46% at 14 days of normal concrete, but at the age of 28 days is not increased, but its value is still in accordance with a plan of concrete quality.
Based on the concrete compressive strength test data, mixture combinations carbide waste glass waste 10% + 7.5%, an increase in the amount of 4.92% at the age of 7 days, amounting to 4.87% at 14 days, and 1.08 % at 28 days, compared with normal concrete. And this proves that the carbide waste and glass waste can be a substitution of alternative materials cement and sand in concrete mixes with a certain variation.