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This study aims at the production of foamed concrete mixed with fly-ash, examInIng the variation of the mechanical properties of foamed concrete, and issuing the data to site engineers for quality control. The experiment began by mixing the fly-ash by a maximum of 60% in stages and the mixing was mainly based on practical mixture. The following results were obtained from the experiment. In the instance of replacing cement with fly-ash. the outlook specific gravity and the water absorption ratio appeared not to be affected, while the compressive strength tended to decrease inversely proportional to the increasing fly-ash as compared to foamed concrete mixed with only cement. However, under long cure periods, an improvement in compressive strength was observed strength. As earlier stated, the pozzolanic reaction of the fly-ash contributed to the increased strength and also assisted in recovering the narrow range of the strength increased ratio obtained at early cure periods.
The purpose of this study is to obtain basic data of the properties of the foamed concrete within Blast-Furnace Slag. To find change of the properties according to admixing Blast-Furnace Slag as substitution of cement, admixture ratio was increased 20% step by step 0% to 60%. The results of study were shown as follow: As the admixture ratio was increased the flow and absorption were decreased. But in most mixture flow was over 210㎜ required in field. In compressive strength, proper admixture ratio was 40% and in spite of admixing Blast-Furnace Slag early aged strength was not decreased. So it is suggested that proper admixture ratio of Blast-Furnace Slag should be 40% considering workability and properties of strength.
In this study we experimented setting time and basic properties as waste wood fiber and sodium silicate substitution rate to reuse waste wood fiber produced in construction field to wood chip board. To do this construction waste woods were crushed with the size less than 10mm, mixed with the rate of 1:2, 2.5, 3, and added sodium silicate with the rate of 0, 5% of cement content. The results are as follows. As the substitution rate of construction waste wood was increased delay of setting time was also increased, and the batch of adding 5% accelerator had a 13~17 hours faster setting time than non accelerator batch. The compressive strength was lower as wood substitution rate was higher, and as the specific gravity was higher, the strength was also higher. As wood substitution rate was higher, heat conductivity was lower, and as specific gravity was higher, heat conductivity also was higher.
The purposes of this study are to obtain basic data for method of remodeling , and to consider a program to understand the degree of deterioration in educational facilities. To get these data, actual repair condition and deterioration condition in Elementary School Facilities were studied. The results of the actual condition of repair in elementary school facilities were as follows. Firstly, pre-examinations based on life-cycle of facilities were not executed. Secondly, inadequate valuations on facilities accelerated the deteriorations of facilities. Finally, construction material and method were applied equally to all facilities ignoring performance criteria. These factors shortened life-cycle and caused economic loss. The results of current problems in maintenance were as follows. Firstly, valuation processes were subject and empirical. Secondly, institution of item and grade to value deterioration was ambiguous. Finally, The facilities were valued by limiting examinations and appraisals. In sum, the establishment of general idea for the evaluation of deterioration and the presentation of total decision method for the scheme of deterioration are required.