시멘트 製品의 品質에 관한 硏究 : 釜山市中 生産品을 中心으로 Available in Busan Area = A Study on the Quality of the Cement Products

다국어 초록 (Multilingual Abstract)

Cement bricks or blocks are commonly used for the bearing wall or the curtain wall.
But the commercially available mass producted cement products (Cement Bricks or Blocks) have many defects as the constituents of a structure.
In this study, the authors carefully examined through the experimentation and reviewed the qualities of the cement products made by the manufacturing enterprises scattering in Busan Area. The results are as follows.
(1) In order that more than 80% of the products have the second class strength, the fineness modulus of aggregate should be more than 3.1 (in view point of the standard compressive strength). In case of Busan Area, the best products can be produced by use of YANGSAN (2) raw aggregate.
(2) There was a big difference as much as 2.3 times in the compressive strength under loose quality control for curing even among the products manufactured by the same company (under a given condition of production method, curing, mix by volume, ratio of cement and water, and quality of aggregates.) The compressive strength is proportional to the weight and the average strength of the wet products decreased about 16.2~28.69% compared with that of the dry products.
(3) If the applications (use for bearing wall, or curtain wall) according to the strength of the products of the same specifications are classified and the quality grades are allocated, the selections of the products will become easier for their suitable applications, and also the safety and longer life of the structures can be expected.
(4) In the regulation of installation for the cement product enterprises, especially the installation requirements of the curing room should be emphasized.