This work investigated the properties of scoria and pumice as supplementary cementitious materials (SCMs) for Portland cement compared to those rice husk ash (RHA). X-ray fluorescence, diffraction, pozzolanic activity index (PAI) tests confirmed suitability these two potential SCMs. Scoria RHA samples achieved over 75% PAI at 7 days whereas did this after 28 days. Initial final mean setting times observed composite blended with were 166 285 min, respectively. These are longer than that...

A research study demonstrated that rice husks can be used to manufacture boards whichcan in low cost housing if bound by Portland limestone cement (CEM II/A-L/32.5R) and reinforced with sisal fibers cater for their brittle behavior suchboards provide a substitute wood panels. Boards made of inthe ratios 1/3.3, 1/ 3.6 1/4 fiber reinforcement contents 0%, 0.4%,0.5% 0.8% were prepared tested physical mechanical properties. Theresults compared standard requirements based fiberand particle panel...

Abstract A plane-stress, Finite element model has been developed to predict the stress distribution in wood members subject perpendicular-to-grain compression. This exploits linearstrain, isoparametric triangular elements used sufficient number achieve a convergent solution. Model verification was achieved through comparison of numerically obtained deformation predictions with corresponding experimental data from actual test specimens. Twenty-seven specimens were instrumented determine their...

Abstract A finite element analysis program exists to evaluate the stress distribution in wood members subjected perpendicular-to-grain (transverse) compression. In this study, was used perform parameter studies effects of key variables on stresses and maximum concentrations transverse These included: specimen geometry (length/depth), loading (loaded length/specimen length), material properties (ratio moduli elasticity direction loading/perpendicular loading). The results showed that a...

A study was made in a cement factory Dar es Salaam, Tanzania, where OrdinaryPortland Cement (CEM I 42.5N) and Portland-limestone (PLC) which has thebrand name Twiga Extra II/A-L/32.5R) are produced conforming to theTanzania Standard TZS 727 (Part1): 2002, is equivalent EN 197 published by thecommittee for European normalization (CEN). comparison between the twotypes of cements terms physical, chemical mechanical properties. It foundout that they all complied with standards, there no...

This paper gives results of a preliminary study on the properties cement bonded woodwool boards manufactured as composites by using wood wool (excelsior) from podocarpus spp. species and ordinary Portland cement. Two main parameters were varied during investigation these width to ratio. Results show that optimum mix proportion is three parts two weight smaller excelsior higher board strengths. The tests flexural strength, compressive strength tensile far exceeded requirements German Standard...

Samples of copper-chromium arsenic compounds (CCA) treated Eucalyptus poles for power transmission were sampledfrom a lot following Military Standard MIL-STD 105D, Single sampling, Tightened Inspection, Acceptable Quality Level(AQL) 4 as provided in the South African SABS 754:1994 from lots containing 151-500 poles. Sampleswere randomly selected lot. Maximum fiber stresses evaluated taking into account actual taper eachpole. The cantilever loading test was performed on samples 754:1994. It...