QAQC in Construction

Major factor should be considered when placing the concrete on-site delivered from the batching plant/Mixing plant, Many and varied below:- Ambient temperature (The Weather During the Casting Time) Specification for the Mix Design Sub-grade Condition Type of Installation (Lean, Structure, Column, Beam, etc.) Form Securement Type of reinforcement Sufficient personnel capable of placing the concrete. Pouring Rate Height of Free Fall of Concrete must not be more than 1.2 m. Avoid Cold Joints

Common Concrete Pouring Issues 1. AIR LOSS: During concrete pouring, air loss can cause problems. Several factors lead to this, such as long vertical drops, high initial slump, increase in pressure, or drop in exit. For every 1% decrease in air, strength decreases by 4-5%. You can fix this problem by adding a gate at the end of the pump line for restriction. It also helps to keep the boom in an upward or horizontal position as much as possible. If this can’t be done you can put multiple 90 degree elbows into the line to slow down concrete, minimizing the straight dropout. 2. BUG HOLES: Bug holes are evident by a small void on the outside of formed concrete surfaces. These come from poor application of form release agents to form-work or completely forgoing their use entirely. It can also come from stiff or sticky concrete mixtures. This can also be caused by poorly placed internal concrete vibrators. To solve the problem of bug holes, make sure release agents are applied...

Method statements, sometimes called ‘a safe system of work’ are documents that detail the way in which tasks should be completed to adhere to safe working practices. But how do you write them?  What tasks do you need them for? And how do they help you win business? There's method to this madness! Method statements demonstrate that you’re doing things safely and legally, which can give you a  competitive edge when pitching for projects and they usually go hand in hand with Risk Assessments. Do I need a Method Statement? Method Statements are frequently requested as part of tender processes to gain an insight into your  organisation and the way you operate. It’s your opportunity to show how you’ll provide goods and  services in a safe and high-quality manner. Writing a Method Statement may seem like a daunting task, but this article will guide you through  the process and enable you to approach Method Statements with confidence. Wha...

THINGS TO CONSIDER ABOUT HOT WEATHER CONCRETE When the temperature of freshly mixed concrete approaches approximately  32 ° C  adverse site conditions can impact the quality of concrete. Ambient temperatures above  40 ° ​ C  and the lack of a protected environment for concrete placement and finishing (like enclosed building) can contribute to difficulty in producing quality concrete. The precautions required to ensure a quality end product will vary depending on the actual conditions during concrete placement and the specific application for which the concrete will be used. In general, if the temperature at the time of concrete placement will exceed  32 ° C  a plan should be developed to negate the effects of high temperatures. The precautions may include some or all of the following: Moisten sub-grade, steel reinforcement, and form work prior to concrete placement. Erect temporary wind breaks to limit wind velocities and sunshades to reduc...

CAVITY AND SLUMP-ZONE PROBING & GROUTING TREATMENT TABLE OF CONTENTS 1.0 WORK ORGANISATION 2.0 DESIGN CONSTRAINTS AND COORDINATION 3.0 CONTRACTING METHODS 4.0 PROCUREMENT METHODS 5.0 RESOURCE PROVISIONS 6.0 LOGISTICS PROVISIONS 7.0 MATERIAL MANAGEMENT SYSTEMS 8.0 CONSTRUCTION METHODS AND TECHNOLOGY 9.0 CONSTRUCTION PHASING AND WORKFLOW 10.0 TRAFFIC MANAGEMENT AND MONITORING 11.0 SAFETY PROGRAM 12.0 QUALITY ASSURANCE AND CONTROL PROGRAMS 13.0 INDUSTRIAL RELATIONS POLICIES 14.0 ENVIRONMENTAL MONITORING PROGRAMS 15.0 APPENDICES 1.0 INTRODUCTION This submission explains the method of construction to be adopted for the Cavity and Slump-zone Probing and treatment at the project site. 2.0 DESIGN CONSTRAINTS AND COORDINATION Not applicable. 3.0 CONTRACTING METHOD The conditions of Contract have been reviewed by PCSB and particularly those conditions in respect of Sub-PCSBs. The conditions are bespoke for this project and therefore be required to be reflected in any form of sub...