Concrete pumping is the most important part of concrete production. The purpose of this technique statement is mainly to assist project managers, staff, and contractors in the safe performance of concrete pumping operations. This technique statement clearly identifies the mechanical requirements and mechanical safety rules for concrete pumping operations to prevent accidents related to machine operation, handling, and equipment failure; to ensure the protection of the environment; and to ensure the protection of the people operating the machines and equipment.
Safety requirements for concrete plants are determined by numerous factors including equipment condition, age, size, reliability, performance, and expected operating life. A concrete plant should be located in an area where there are no buried wires, pipes, or other potential sources of danger. An automatic gate is a simple and inexpensive mechanical device that allows the entry of large trucks without manually lifting or pushing heavy doors. This simple solution prevents accidental discharges of cement and other fluids into the air while waiting for a full concrete plant to pour or after the completion of a pouring and pumping operation.
When concrete plants are operating under capacity, manual lifting of concrete materials may result in human injury. To avoid unnecessary injury to workers, a guideline has been issued stating that a maximum of one person should be placed on the job site at any given time to perform tasks such as measuring different concrete materials. Manual weighing or manually measuring the ingredients of different concrete mixtures is a potential hazard when concrete batching and mixing are performed by unqualified personnel. A concrete batching and mixing system should be operated according to the appropriate batching indicators and load capacity indicated on the batching system.
While waiting for the concrete mixture to arrive at the job site, workers should not be in direct sunlight because exposure to direct sunlight can cause temporary discoloration or even the development of cancer. To help prevent this problem, temporary concrete covers should be applied prior to the arrival of the concrete to provide workers with a shield against the sun’s rays while they measure and mix the concrete batch. If the concrete mixture is being mixed in a hot environment, special concrete coverings should be applied before beginning the mixing process to protect it from heat damage. As always, when dealing with hot weather, the worker must wear a sunscreen and hat.
While batching concrete at a temperature above 55 degrees Fahrenheit is generally not advisable, it is not harmful if done properly. The concrete should be mixed using a paddle mixer that features a forward and back motion. When using a paddle mixer, the mixing vessel should be dipped into a bucket of water to prepare the mix. Once the mix is ready, the mixing vessel should be raised to a standing height and the paddle should be turned to the side to allow the mix to fall through the mixing nozzle.
Different types of concrete mixes are available to homeowners. To determine the right type of concrete for the job, a homeowner should consult a concreting plant specialist who can offer guidance on the best mix for the project. Not all concrete mixers are created equal, however, so it is important to research the various types of concrete mixers on the market. For help in deciding what concrete mix is best for the job, contact a hydration specialist at your local concrete plants.