Title:
Lightweight Structural Concrete Proportioning and Control
Author(s):
George H. Nelson and Otto C. Frei
Publication:
Journal Proceedings
Volume:
54
Issue:
1
Appears on pages(s):
605-621
Keywords:
no keywords
DOI:
10.14359/11458
Date:
1/1/1958
Abstract:
Physical properties and gradation of an expanded shale aggregate produced in Georgia are given. Effect of fine aggregate:coarse aggregate ratio and effect of entrained air on properties of lightweight structural concrete are discussed. Recommends optimum air content for maximum strength of lightweight concrete with from 3 to 9 sacks of cement per cu yd. Proposes a proportioning method which makes use of a specific gravity factor. Using this proportioning method with aforementioned aggregate, tests were made on a series of mixes with from 3 to 9 sacks of cement,per cu yd. Properties reported include compressive, flexural, and bond strength; modulus of elasticity; diagonal tension; and thermal conductivity. Field control practices for lightweight structural concrete are briefly considered.