Abstract
A development of Reactive Powder Concrete (RPC) currently is the use of quartz powder as a stabilizing agent with the content to cement ratio of 30% and steam curing method in an autoclave temperature of 250oC which produced a high compressive strength of 180 MPa. That RPC can be generated due to one reason for using the technique of steam curing in an autoclave in the laboratory. This study proposes in-situ curing method in order the curing can be applied in the field and with a reasonable compressive strength results of RPC. As the benchmarks in this study are the curing methods in laboratory that are steam curing of 90°C for 8 hours (C1), and water curing for 28 days (C2). For the in-situ curing methods that are covering with tarpaulins and flowed steam of 3 hours per day for 7 days (C3), covering with wet sacks for 28 days (C4), and covering with wet sacks for 28 days for specimen with unwashed sand as fine aggregate (C5). The comparison of compressive strength of the specimens in this study showed compressive strength of RPC with in-situ steam curing (101.64 MPa) close to the compressive strength of RPC with steam curing in the laboratory with 8.2% of different. While in-situ wet curing compared with the water curing in laboratory has the different of 3.4%. These results indicated that the proposed in-situ curing methods are reasonable good in term of the compressive strength that can be achieved.
Highlights
The Reactive Powder Concrete (RPC) with its very high compressive strength can be made by precast in laboratory or factory
The test results of average compressive strength on Reactive Powder Concrete (RPC) with the steam curing in laboratory (C1), the water curing (C2), the in-situ steam curing (C3), the in-situ wet curing (C4), and the in-situ wet curing for the specimen with unwashed sand (C5) are respectively, 110.73 MPa, 102.36 MPa, 101.64 MPa, 98.88 MPa, and 73.47 MPa (Fig. 5)
This possibly causes the value of the compressive strength of RPC treated with steam curing of 90°C for 8 hours (C1) in this study that have a greater value than the other curing methods
Summary
The Reactive Powder Concrete (RPC) with its very high compressive strength can be made by precast in laboratory or factory. For this purpose, steam curing can be carried out in conditions that can be controlled with a certain temperature for a few hours. Unlike the case of RPC with the application on road pavement for example, it is casted directly on the ground or casted in-situ. In this case, the method of RPC curing after casting should be taken into account carefully.
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