QAQC in Construction

ROCKFILL: Rockfill will generally be natural materials that are hard, durable, and larger than gravel size. Rock-fill may contain only trace amounts of sand or fine-grained soil materials; however, various amounts of sand and fine-grained materials may be allowed by some specifications. Riprap materials differ from rock-fill in that they are generally clean materials of a specified gradation. Rockfall materials may be from a source on the construction site or from offsite sources. On some occasions, rock-fill materials may be of less durable onsite materials that are more weathered, but are being used as a zoned fill for purposes of economy. These types of materials will breakdown during the processing and compaction, so close attention needs to be given to specified methods and field test results. Borrow sources (onsite or offsite), gradation, quality of rock-fill materials, processing, and compaction need to be clearly designated in the drawings and specifications. With respec...

SUBMITTAL PROCEDURE   Details     Last Updated: 25 November 2018 GENERAL INFORMATION: All materials proposed for use in concrete and all concrete mix designs shall be approved by the Client prior to use. Such materials include coarse and fine aggregates, cementitious materials, admixtures and water.  All materials shall be SAMPLED and TESTED after December 1st of the previous year or the most current testing data if ANNUALLY tested by MOC. All Client's approved mix designs for 2017-2018 will expire on December 31, 2018, even if mixes are used on multi-year construction projects. New mix designs must be submitted to CASPAR to remain an approved MOC supplier for 2019. Mix designs, meeting specification requirements, in PDF format, received by December 15, 2018 will be approved by the deadline.  MOC will preapprove aggregates and cementitious materials. Submit certifications directly to MOC. If the material is approved by MOC it will be add...

Soil types The type of soil determines the strength and stability of trench walls. Identifying soil types requires knowledge, skill, and experience. Even hard soil may contain faults in seams or layers that make it unstable when excavated. The foreman or supervisor must be knowledgeable about soil types found on a project and plan protection accordingly. This knowledge must include an awareness that soil types and conditions can change over very short distances. It is not unusual for soil to change completely within 50 metres or for soil to become saturated with moisture over even smaller distances. The Construction Regulation sets out four soil types. If you are unsure about the soil type, have the soil tested to confirm the type. Type 1 — It is hard to drive a pick into Type 1 soil. Hence, it is often described as “hard ground to dig”. In fact, the material is so hard, it is close to rock. When excavated, the sides of the excavation appear smooth and shiny. The sides will remain...

(a) Scope and application - (1) Scope. This appendix describes a method of classifying soil and rock deposits based on site and environmental conditions, and on the structure and composition of the earth deposits. The appendix contains definitions, sets forth requirements, and describes acceptable visual and manual tests for use in classifying soils. (2) Application. This appendix applies when a sloping or benching system is designed in accordance with the requirements set forth in 1926.652(b)(2) as a method of protection for employees from cave-ins. This appendix also applies when timber shoring for excavations is designed as a method of protection from cave-ins in accordance with appendix C to subpart P of part 1926, and when aluminum hydraulic shoring is designed in accordance with appendix D. This Appendix also applies if other protective systems are designed and selected for use from data prepared in accordance with the requirements set forth in 1926.652(c), and the use of t...

I. Introduction Excavating is recognized as one of the most hazardous construction operations. OSHA recently revised Subpart P,  Excavations , of  29 CFR 1926.650 ,  29 CFR 1926.651 , and  29 CFR 1926.652  to make the standard easier to understand, permit the use of performance criteria where possible, and provide construction employers with options when classifying soil and selecting employee protection methods. This chapter is intended to assist  OSHA Technical Manual  users, safety and health consultants, OSHA field staff, and others in the recognition of trenching and shoring hazards and their prevention. II. Definitions A. Accepted Engineering Practices  are procedures compatible with the standards of practice required of a registered professional engineer. B. Adjacent Structures Stability  refers to the stability of the foundation(s) of adjacent structures whose location may create surcharges, changes in soil condition...