COMPARISON OF FINE AGGREGATE TO MORTAR STRENGTH BETWEEN SAND AWANG BANGKAL AND SAND BARITO

the compressive strength on the age of mortar At the age of 3 days Semen Gresik Pasir Barito is 6.05 Mpa, At the age of 7 days Semen Gresik Pasir Barito is 6.05 Mpa, At the age of 14 days Semen Gresik Pasir Awang Bangkal is 8.66 Mpa, At the age of 28 days Semen Gresik sand Awang Bangkal 10.68 MPa. It can be concluded that Pasir Barito is included in zone IV, and Pasir Awang Bangkal is included in zone II.


Introduction
The progress of constructing buildings that are developing in our country affects the number of various building functions resulting in the number of buildings, the desired acceleration of buildings, and demands for higher quality construction (Simanjorang & Nawawi, 2022).
Mortar combines fine aggregate (Sand), binder (Portland Cement, Clay, Lime), and water. The function of the mortar is the binding matrix of the constituent parts of a construction, both structural and non-structural (Umum & al S.P.M., 1970). The use of mortar for construction is structural, for example, masonry mortar for foundation structures, while for nonstructural purposes, for example, brick masonry mortar for infill walls (Sari, Wallah, & Windah, 2015).
The standard specifications for mortar refer to its compressive strength, namely where the mortar must be able to accept the load (Ali & Walujodjati, 2021). Considering that as a part of mortar construction, it plays an essential role in carrying loads, several factors influence the results of the compressive strength of the mortar, including the type of cement, the amount of The following is an explanation of the stages of material testing in this Final Research activity (Ali & Walujodjati, 2021) dan (Pranoto et al., 2021): (a). Material Characteristics Testing They tested the characteristics of the material using the S.N.I. method. Characteristic tests include sieve analysis, specific gravity and absorption, delicate aggregate gradation zone, fineness modulus, moisture content, silt content, organic content, and bulk density of fine aggregate.

(b). Determination of Mixed Proportions Variations
Determination of the proportion of the mixture is carried out to obtain data on the compressive strength of the specimens for each variation of the mixture.

(c). Calculation of Mix Formulas
The Mix Formula calculation is carried out to determine how much material is needed for the manufacture of the test object by calculating the total volume per proportion and using the data from the expected test results that have been done previously as additional data to calculate the Mix Formula. (d). Cement Water Factor Test (F.A.S.) The cement Water Factor Test (F.A.S.) is carried out to determine the ratio of the proportion between cement and water so that the mixture is not excess water which can result in the compressive strength of the mixture not being maximum. (e). Test Objects I am making the test object using a square mold of 5 cm x 5 cm x 5 cm with the number of test objects per proportion of the mixture, namely as many as 9 test objects per proportion. (f). Treatment of Test Objects (Curing) Treatment of the specimen (Curing) is carried out after the mortar is removed from the mold the day after the manufacture of the specimen, except for the specimen, which will be compressed at three days. Treatment of the test object (Curing) is carried out by immersing the test object in water until the compressive strength test is carried out. This is done to keep the surface of the specimen constantly moist to ensure the cement hydration process (cement and sand reaction).

(g). Compressive Strength Testing
Mortar compressive strength testing was carried out at three days, seven days, 14 days, and 28 days with a note that the test object must be removed from the water a maximum of 3 days before the test is carried out.

(h). Compressive Strength Test Data Analysis
Analysis of the compressive strength test data of the mortar test object, namely in the form of compressive strength data at the age variation of the compressive strength test for each proportion of the mortar mixture. To obtain a relationship between the compressive strength of each mortar mixture proportion variations with the age of the mortar.

Results and Discussion A. Cement Testing Results
The blocks of cement used in the research/testing are tonnes and gresik blocks of cement. The test results can be seen in table 1 (Hariono, Rusli, & Hernanti, 2016). Based on graph .1 above, the initial setting time is reached when the Vicat needle descends as deep as 25 mm for 30 seconds. The initial setting time for Gresik cement is 80 minutes. Meanwhile, the final setting time was reached at 150 minutes when the Vicat needle was placed above the sample for 30 seconds and did not decrease (Nasional, 2002).

B. Satisfactory Aggregate Test Results (Barito Sand)
The fine aggregate used is Barito sand. By testing the specific gravity, absorption, silt content, moisture content, organic content, bulk density, and sieving analysis, the results of the proper aggregate testing (Barito Sand) can be seen in table 2. The calculation data in table 2 is in Appendix III. Table 2 shows that the fine aggregate (Barito sand) in the organic content test did not meet the specification requirements (Wahjoedi, Kusdiyono, Supriyadi, Wahyono, & Mahbub, 2022). Based on the sieving analysis test that has been carried out by himself. It can be seen that the cumulative average passed on the sieve shows that this (Barito) sand is included in zone IV (Ali & Walujodjati, 2021). Seeing from the average, it is in the middle of the cumulative limit of zone IV.

C. Satisfactory Aggregate Test Results (Bangkal Awang Sand)
Agregat halus yang digunakan adalah pasir Barito, dengan melakukan pengujian berat jenis, penyerapan, kadar lumpur, kadar air, kadar organik, berat isi, analisa saringan, hasil dari pengujian agregat halus (Pasir Awang Bangkal) dapat dilihat pada tabel 4. Based on the sieving analysis test that has been carried out by himself. It can be seen that the cumulative average passed on the sieve shows that this sand (Awang Bangkal) is included in zone II. Seeing from the average, it is in the middle of the cumulative limit of zone II.

D. Calculation of Mixed Mortar Mix (Mix Design)
For the calculation of mortar mix according to (Gumelar As'at & Nuriani, 2021), the materials used are fine aggregate of Barito and Awang Bangkal sand, the cement used is grit cement, and the water used according to the determined proportion.
The following is the proportion of mortar mixed with a mixture of 1 part Portland cement and three parts sand.

F. Mortar Compressive Strength Test Results
The results of the mortar compressive strength test, according to (Indriyati, Malik, & Alwinda, 2019) for one variation of cement type, there were 15 test objects divided into four mortar ages, namely 3, 7, 14, and 28 days. The compressive strength test of the mortar results is shown in Tables 9 and 10.  The results of the mortar tests in tables 10 and 11 at the ages of 3, 7, 14, and 28 days with a total of 30 samples, show that the compressive strength of Gresik cement with Barito and Awang Bangkal sand shows that the average always increases and the highest compressive strength occurs in 28 days old. = 54,81 kg/cm 2 Based on the table and calculations above, it can be seen that the characteristic compressive strength of the ratio 1Pc: 3Ps of Barito sand is 54.81 kg/cm2.