Browsing by Author "Jau, WC"

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A study of the basic engineering properties of slag cement concrete and its resistance to seawater corrosion
(1998-10-01)
Jau, WC
;
Tsay, DS
;
土木工程學系
;
Department of Civil Engineering
This study uses slag to substitute for up to 50% of cement by weight to make slag-cement concrete. The specimens were subjected to wet-dry cycle accelerated test for more than one year. The compressive strength, permeability, electrical resistance, concentration of chloride ions, corrosion potential, and pore size distribution were measured at various ages. The test results show that the slag concrete with 20-30% substitution has the best corrosion resistance. (C) 1998 Elsevier Science Ltd.
Study of feasibility and mechanical properties for producing high-flowing concrete with recycled coarse aggregates
(2004)
Jau, WC
;
Fu, CW
;
Yang, CT
;
土木工程學系
;
Department of Civil Engineering
This study uses crushed waste concrete with compressive strength ranged from 210 to 350 kgf/cm(2), as recycled aggregates to produce high-flowing concrete. Proper amount of fly ash (25%, 30%) and superplasticizer is added. The water-to-cementitious material ratio (w/cm) was 0.50, 0.55, and 0.60. The engineering properties including compressive strength, splitting tensile strength and bond strength were tested. Meanwhile, the results were compared with those from specimens made of natural-aggregate with same mix proportions. The physical properties of recycled aggregates obtained from crushed waste concrete of this experiment meet CNS1240 (equivalent to ASTM C33) specifications and requirements. The engineering properties of concretes made from natural and recycled aggregates showed only slight differences. The utilization of recycled aggregates for high flowing concrete is confirmed and is an environment friendly material.