BUIL15 - COMPARATIVE ANALYSIS OF PERFORMANCE OF MARINE BOARD AND WOOD PLANK

COMPARATIVE ANALYSIS OF PERFORMANCE OF MARINE BOARD AND WOOD PLANK

CHAPTER ONE

1.0       INTRODUCTION

A plank is timber that is flat, elongated, and rectangular with parallel faces that are higher and longer than wide. Used primarily in carpentry, planks are critical in the construction of ships, houses, bridges, and many other structures. Planks also serve as supports to form shelves and tables. Usually made from sawed timber, planks are usually more than 1 ¹⁄₂ in (38 mm) thick, and are generally wider than 2 ¹⁄₂ in (64 mm). In the United States, planks can be any length and are generally a minimum of 2 in (51 mm) deep by 8 in (200 mm) wide, but planks that are 2 in (51 mm) by 10 in (250 mm) and 2 in (51 mm) by 12 in (300 mm) are more commonly stocked by lumber retailers.  Kostova  et. al.(2012). The cross sections of the beams depend on the loads to be resisted. Because of their good workability, wooden beams have a wide field of application. In addition to wooden beams, prefabricated steel parts (steel beams, clamps etc.) are also used. Clamps are mainly used for column formwork. Marine board is a sheet material manufactured from thin layers or "plies" of wood veneer that are glued together with adjacent layers having their wood grain rotated up to 90 degrees to one another. It is an engineered wood from the family of manufactured boards which includes medium-density fibreboard (MDF) and particle board (chipboard).

All marine boards bind resin and wood fibre sheets (cellulose cells are long, strong and thin) to form a composite material. This alternation of the grain is called cross-graining and has several important benefits: it reduces the tendency of wood to split when nailed at the edges; it reduces expansion and shrinkage, providing improved dimensional stability; and it makes the strength of the panel consistent across all directions.

            There is usually an odd number of plies Orr, et. al. (2011), so that the sheet is balanced—this reduces warping. Because marine board is bonded with grains running against one another and with an odd number of composite parts, it is very hard to bend it perpendicular to the grain direction of the surface ply. Smaller thinner marine boards and lower quality marine boards may only have their plies (layers) arranged at right angles to each other, though some better quality marine board products will by design to have five plies in steps of 45 degrees (0, 45, 90, 135, and 180 degrees), giving strength in multiple axes. Marine marine board is manufactured from durable face and core veneers, with few defects so it performs longer in both humid and wet conditions and resists delaminating and fungal attack.

            Its construction is such that it can be used in environments where it is exposed to moisture for long periods. Each wood veneer will be from tropical hardwoods, have negligible core gap, limiting the chance of trapping water in the marine board and hence providing a solid and stable glue bond. It uses an exteriorr Water and Boil Proof (WBP) glue similar to most exterior marine boards Lee (2010). Marine marine board can be graded as being compliant with BS 1088, which is a British Standard for marine marine board. There are few international standards for grading marine marine board and most of the standards are voluntary. Some marine marine board has a Lloyd's of London stamp that certifies it to be BS 1088 compliant. Some marine board is also labeled based on the wood used to manufacture it. Examples of this are Okoumé or Meranti.

1.1              Statement of Problem

Wood planks to be precise have a lot of disadvantages such as; rough edges and surfaces, weaker tensile strength, serious bracing, less numbers of re-use. To some extent wood planks absorb more of water contined in concrete mixed, thus resulting to shrinkages on concrete.

The introduction of marine boards which is a composite material, proves t solve-eradicate the quest for a stronger and smoother, less water absorbing and a great number of re-use durability of marine board.

   Marine board tends to give a better finish and thus reducing double handling on the hardened concrete members, after stripping.

Also, marine bods have been discovered to be more demanding in respect to the skill of workman (carpenter) in putting them in place as formwork for beams, slabs and colomns

1.2       Research Question

a.         What are the required strength of marine board and wood plank?  

b.         What are the level of water absorption of MDF, HDF and wood plank?

1.3       Aims of the study

The aim of this project work is to investigate the comparative analysis of performance of marine board and wood plank as a formwork material.

1.4       Objectives of the study

a.         To determine the compressive strength of marine board and wood plank.

b.         To determine the water absorption properties of MDF, HDF and PLANK.

1.5       Significant of the study

All support systems have to be height adjustable to allow the formwork to be placed at the correct height and to be removed after the concrete is cured. Normally adjustable metal props similar to (or the same as) those used by beam slab formwork are used to support these systems. Some systems combine stringers and supports into steel or aluminum trusses. Yet other systems use metal frame shoring towers, which the decks are attached to. Another common method is to attach the formwork decks to previously cast walls or columns, thus eradicating the use of vertical props altogether. In this method, adjustable support shoes are bolted through holes (sometimes tie holes) or attached to cast anchors. Formwork in concrete construction is used as a mould for a structure in which fresh concrete is poured only to harden subsequently. Types of for concrete construction depends on material and type of structural element. Formwork can also be named based on the type of structural member construction such as slab for use in slab, beam, column for use in beams and columns respectively etc.

1.6       Materials and Methods

In order to achieve the state objectives of this project/ proposal the following means will be employed.

a.       Practical work will be done

b.      Review of other practical work on this topic 

Experimentation of this work will be carried out  

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