Variation of Cement Types Usage for Compressive Strength of Concrete Quality F'c 35 Mpa

of the concrete characteristics of the tonal cement variation is higher than


INTRODUCTION
Concrete is a mixture of cement, fine aggregate, coarse aggregate and water, the compressive strength and quality of concrete are greatly influenced by cement.Cement is a hydraulic adhesive for building materials, meaning it will become an adhesive when mixed with water.There are three types of cement, namely PPC (Portland Pozzoland Cement), PCC (Portland Composite Cement), and OPC (Ordinary Portland Cement).
PPC cement (Portland Pozzoland Cement) is a hydraulic cement made from Portland cement clinker with gypsum and pozzolanic materials, for public buildings such as bridges, highways, housing, wharves, dams and irrigation buildings.
Whereas PCC (Portland Composite Cement) cement is a hydraulic binding cement resulting from grinding together slag Portland cement and gypsum with one or more inorganic materials, or the result of mixing Portland cement powder with other inorganic material powders.These inorganic materials include blast furnace slag, pozzolan, silicate compounds, limestone, with a total inorganic content of 6% -35% by mass of composite portland cement.Usually used for general construction such as concrete work, masonry, gutters, roads, wall fences and the manufacture of building elements in particular such as precast concrete, prestressed concrete, concrete panels, concrete bricks (paving blocks).
Meanwhile, the OPC (Ordinary Portland Cement) cement type is a hydraulic cement that is widely used for general construction or buildings that do not require special requirements, such as building high-rise buildings, highways, runways, etc.This type of cement has the highest silica content among PPC and PCC cement types, but OPC type cement is rarely found directly on the market.
Based on above phenomenon, the research conducted on concrete is expected to be able to answer about the technical types of cement.
In this study the cement used was PPC and PCC type cement, because this type of cement is very easy to find in the market.This research aims to determine the physical properties of various types of cement and to know the characteristic compressive strength values produced for various types of cement for concrete quality f'c 35 MPa.With this research, it can provide a deeper understanding and knowledge of the characteristics of various types of cement, especially for concrete.

METHODS
This research was conducted at the Structures and Materials Laboratory of the Banjarmasin State Polytechnic, South Kalimantan, using the SNI (Indonesian National Standard) and AASTHO methods.This research includes: 1. Beginning: Prepare materials to be inspected.2. Inspection of materials: Materials that have been prepared are then examined using SNI, PACT-012.79and AASTHO methods.The materials to be examined are: a) PPC (Gresik) and PCC (Tonasa and Tiga Roda) Cement with Specific Gravity Testing Method, Consistency Testing Method, Initial Setting Time Testing Method, Fineness Testing Method.3. Concrete Testing Method 8. Data Processing: An activity that is intended to process, summarize and compile all the data and calculations obtained starting from material inspection to concrete testing which will later be discussed so that the results obtained from the data processing are obtained.9. Conclusion: taken from the results of data processing that has been done.Which conclusions will answer the problems and objectives of the research activities carried out.

Fine Aggregate Test Results (Barito Sand)
The fine aggregate used is Barito sand, by testing silt content, clay lamb, organic matter content, specific gravity, absorption, bulk density, moisture content, sieving analysis, the results of testing fine aggregate (Barito sand) can be seen in table 4.  The coarse aggregate used was supplied from PT. Pandji Bangun Persada, by testing hardness/ wear, silt content, clay lamb, specific gravity, absorption, moisture content, sieving analysis, the results of testing fine aggregate (barito sand) can be seen in table 5.

Cement Test Results
In the cement testing carried out there were 2 types of 3 types of cement namely Gresik cement (PPC), Tonasa cement and Tiga Roda (PCC).The test results of the three cements can be seen in table 6 to table 8. Table 6.Test Results for Semen Gresik (PPC) The graph of Gresik cement setting time, tonasa and three wheels can be seen from graphs 1 to 3 Graph 1.Initial Setting Time of Gresik Cement Graph 2. Initial Setting Time of Tonasa Cement Graph 3. Initial Setting Time of Tiga Roda Cement From the results of cement testing, it can be concluded that: 1.The specific gravity of Tonasa cement is smaller than Gresik cement and Tiga Roda cement.
2. Of the three types of cement, the three wheels cement type is smoother than the Gresik and Tonasa cement types.
3. Cement tones have a smaller consistency.4. The initial setting time for three-wheeled cement is faster.

Concrete Mix Planning Calculation (Mix Design)
For the calculation of concrete mix planning (mix design) according to SNI 03-2834-1993 the materials used are water, fine aggregate of barito sand, coarse aggregate of crushed stone and cement used are Gresik, Tonasa and Tiga Roda cement, the proportion of the mixture of the 3 types of cement, fine aggregate, coarse aggregate and water are all same.Mixed planning calculations are in tables 9 to 11.

Concrete Compressive Strength Test Results
The results of the concrete compressive strength test according toSNI 03-1974-1990For 1 variation of cement type there are 12 cylindrical specimens and divided into 4 concrete ages, namely 7, 14, 28 and 56 days.From the concrete compressive strength test carried out, the following results were obtained: The compressive strength test results of Gresik Cement Mix (PPC), Tonasa and Tiga Rodas (PCC) with a composition of 32 percent fine aggregate and 68 percent coarse aggregate in Tables 12 to 14.

Calculation of Standard Deviation of Concrete Mix
From the results of the concrete compressive strength test with each mixture that has been obtained, then the next step is the calculation of the standard deviation (S) and the average compressive strength.It can be concluded that the average value of the compressive strength of the concrete mix using three-wheel cement from 12 specimens is 35.We can conclude that the characteristic compressive strength of tonasa cement is higher, and the characteristic compressive strength of Gresik cement is lower in compressive strength.

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Table 15.Calculation of Standard Deviation in Concrete with Mixed Cement Gresik (PPC) It can be concluded that the average value of the compressive strength of the concrete mix using Gresik cement from 12 specimens is 34.576MPa and the Standard Deviation is 3.604 MPa.Table 16.Calculation of Standard Deviation in Concrete with Tonasa Cement Mixture (PCC)It can be concluded that the average value of the compressive strength of the concrete mixture using tonal cement from 12 specimens is 41.648 MPa and the Standard Deviation is 3.578 MPa.
802 MPa and the Standard Deviation is 2.342 MPa Evaluation of Concrete Compressive Strength After obtaining the results of the calculation of the standard deviation and the average compressive strength of the concrete mix, then an evaluation of the compressive strength of the concrete for each mixture is carried out against variations in the type of cementWrite a conclusion based on your interpretation of the findings and discussion.The conclusion presents critical points that explain the answers to research questions.In this section, the author can provide input and recommendations.Suggestions present advanced ideas to be developed in subsequent research or practical improvement Evaluation of Compressive Strength of Cement Gresik Mixed Concrete (PPC) Graph of Average Compressive Strength Value of Concrete 28 Days From Graph 8, the compressive strength value of the average age of 28 days decreases as the compressive strength is multiplied by the age factor.For ages 7,14 Graph of Compressive Strength Comparison of Concrete Characteristics , 28, 56 days multiplied by 0.70, 0.88, 1.0, and 1.09 Graph 9. Graph of Characteristic Compressive Strength of Concrete Based on Graph 9 the characteristic compressive strength graph for Gresik cement = 28.665,tonasa cement = 35.779and three-wheeled cement = 31.96.
Based on the results of research on "Use of Variations in the Type of Cement Against the Compressive Strength of Concrete Quality f'c 35 MPa" can be concluded as follows: 1. Physical properties of each cement such as specific gravity of Gresik cement = 3.14, Tonasa cement = 3.08, Tiga Roda cement = 3.18, Gresik cement consistency = 26%, Tonasa cement = 24%, Tiga Roda cement = 27%.Initial setting time of threewheel cement = 79 minutes faster than Gresik cement = 85 minutes and tonasa cement = 87 minutes, retained by the No.200 sieve three-wheel cement = 21% finer than Gresik cement = 24.60% and tonasa cement = 28.40%.2. The value of the compressive strength of concrete characteristics for variations in cement type for f'c concrete quality is 35 MPa, for cement tonnage variations (PCC) = 35.779MPa, high compressive strength compared to Gresik cement variations (PPC) = 28.665MPa and three-wheeled cement variations (PCC) = 31.961MPa.

Table 4 .
Fine Aggregate Test Results (Barito Sand) Source: Test & Calculation of Fine AggregateCoarse Aggregate Test Results (Cracked Stone)

Table 5 .
Coarse Aggregate Test Results (Cracked Stone) Source: Test & Calculation of Fine Aggregate Based on the test results it can be concluded that coarse aggregate (crushed stone) is included in the SII 0052-80 specification and can be used for casting.

Table 9 .
Proportion of Gresik Cement Mix Mix (PPC)

Table 11 .
Proportion of Tiga Roda Cement Mix Mix (PCC)

Table 12 .
Compressive Strength Test Results for Semen Gresik (PPC) Slump 72 MM

Table 13 .
Compressive Strength Test Results of Cement Tonasa (PCC) Slump 70 MM Source: Results of Calculation of Concrete Compressive StrengthTable 14. Compressive Strength Test Results for Tiga Roda Cement (PCC) Slump 72 MM Source: Results of Calculation of Concrete Compressive Strength

Table 17 .
Calculation of Standard Deviation of Concrete with Tiga Roda Cement Mix (PCC)

Table 18 .
Evaluation of Compressive Strength of Cement Gresik Mixed Concrete (PPC)

Table 19 .
Evaluation of the Compressive Strength of Tonasa Cement Mixed Concrete (PCC) Source: Calculation of Concrete Compressive Strength Evaluation Graph 5. Graph of Compressive Strength Evaluation of Cement Tonasa Concrete (f'c 35 MPa) Slump 70 MM The characteristic compressive strength achieved by the Gresik cement mixture is as follows:Based on the calculation results it can be seen that the design of high quality tonasa cement concrete mix (f'c 35) 70 mm slump from 12 specimens, all meet the requirements.Thus the test using this tonasa cement can be called successful, because the characteristic compressive strength value is above the average design value.

of Comparison of Compressive Strength with Age of Concrete.
Graph 7. Graph of Comparison of Compressive Strength with Age of ConcreteFrom Graph 7, a comparison chart between compressive strength and concrete age, it can be concluded that the compressive strength of tonasa cement is higher than Gresik cement and Tiga Roda cement