Proposition for specifications and purchase price of concrete supplied on the site

Abstract

This article seeks to establish a set of specifications tor the purchase of premixed concrete, and also stimulate among those interested in this material a systematic discussion that may lead to the development of a specification suitable for current needs. The amount of ready mixed concrete that is being used is now very large, and in some regions it is the almost sole form of concrete used. In spite of this, there are no specifications that regulate correctly the manner of supplying this material. The first part of the article merely cites the specification. In the second justifications are given for some of the headings of the specification, especially in regard to system of payment. Additionally, some comments are offered on the control of the concrete quality at the working site, which is in disagreement with the recently published regulation by the Ministry of Public Works. It is intended that some discussion shall develop on this branch of the technology of concrete. Beyond this, it will be observed that the proposed specifications follow closely the current «Instruction» of the Ministry of Public Works, 1968.