Selection of project implementation method is very important, because with correct implementation method it can give maximum results especially in terms of cost and time. One of the ways is replace conventional methods into modern ones. It raises to innovations in construction implementation methods that reduce wood material as formwork. In this study, the comparisons between conventional deck method, precast segment and bond deck in terms of time, cost and structure taken sampling from one floor which is fifth floor. Precast method used Hollow Core Slab (HCS). The required data are working drawings, budget estimate plan, Master Scedule, and AHSP Palembang 2017. Result of analysis in term of cost hollow core slab method is 8.45%, bigger than conventional method. Cost of bond deck method 9.56% is saving than conventional method. Implementation of hollow core slab and bond deck method 27,3% faster than conventional methods, the difference in moment of the hollow core slab method to the conventional method is 2,47%, or moment in the hollow core slab plate is bigger than conventional plate. On bond deck because of working moment is assumed same with conventional method, moment percentage is 0%..
Various research and experiments in the field of concrete is done as an effort to improve the quality of concrete, One of them to improve the quality of concrete is added admixture type D-retarder. It is expected that the results of these experiments and experiments are able to answer the higher demands in the foundry implementation which sometimes takes a long time. The purpose of this study was to investigate the effect of Type D dosage admixture on moderate quality concrete fc30, the dose of this study was 0%, 0.35%, 0.75%, 1.10% of sementitious weight. The test used is a compressive strength to determine the quality of fc30 while setting time to find the initial time of sett. which is used as parameter parameter does not occur cold joint. The result showed that experiment 1 as the parameter that is design without admixture type D-VZ, dose 0,00%, compressive strength 28 days 33,13 Mpa, experiment 2 dose 0,35%, compressive strength up 10% from experiment 1, 3 dose experiments 0.75%, a compressive strength rose 6% from experiment 1, experiments 4 doses 1.10%, a compressive strength down 4% from experiment 1. As for the D-VZ admixture dosage and addition dose, concrete deceleration deceleration, D-VZ type non-admixture concrete parameter, 1 dose 0,00% experiment resulted in initial sett 127 minutes, 2 dose experiment 0.35%, resulted in initial sett 267 minutes , experiment 3 dose 0.75%, resulted in initial sett 933 minutes, experiment 4 dose 1.10%, resulted in initial sett 2520 minutes. Expected from this research, can be used as a reference for Project Supervisor, Contractor, Readymix Supplier, especially for concrete over dose (= long concrete setting), which can be maintained with the reference of strong compressive strength achieved, so that the concrete loong setting on the structure is not in Demolish (= slash). And will be used as a handle if it requires deceleration concrete can be added admixture type D.
Development must have clear directions or goals so that planned results can be achieved more optimally. Supervision, evaluation, and control need to be done, especially concerning issues of cost and time of project implementation so that project performance can be known as well as predicting the magnitude of the cost and time of project completion. If the project experiences delays in completion, use the Earned Value Management (EVM) method to control the project time and cost. A construction project implementation will certainly be helped by the existence of an information system. Work delays can be immediately known so that the control process becomes easier. Not only in the process of controlling but also in the process of storing documents and project data, because with the use of information systems the process of storing documents and project data becomes easier and more concise. Therefore the project control information system is designed using the EVM method using the XAMPP application program. Through this information system design, the results of the EVM program output can be validated with the results of manual calculations. The information system that has been created has a user-friendly appearance that will facilitate project actors, especially contractors in conducting performance analysis using the EVM method and also expected that this program can get the right results and reduce the risk of inaccuracy in the calculation.
Concrete is a building material that is very popularly used in the world of construction services, along with the rapid development of concrete technology has been successfully developed various innovation on additive material in concrete mixes to get good quality concrete. Consol SG is an additive material or admixture which is a product of liquid concrete plasticizers and high water reducing agents by regulating the effect of retarding, can increase workability without increasin g water content, reducing water without losing workability, and increasing compressive strength, and chloride free with no damaging on reinforcement. This research used an experimental method in a laboratory with a total of 60 samples of specimens, concrete compressive strength at 28 days with a cylinder diameter of 150 mm high by 300 mm with a variation of Consol SG mixture of 0%, 0.2% and 0.3% with high quality planned f'c = 30 MPa, on the effect of Consol SG addition on the compressive strength of the concrete which is viewed from the variation of Consol SG mixture. The results of the concrete compressive strength value of Consol SG 0.2% is 31.13 MPa (up to 2.54% in terms of normal concrete), for the variation of Consol SG 0.3% mixture of 32.25 MPa (up to 6.22% in terms of normal concrete). While the variation of 0.2% to 0.3% increased by (3.59%). The test of the statistical model used is the Chi-Square test and the T-test using the SPSS software.
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