BYPRODUCT R Mokoena and M B Mgangira Southern Africa Transport Conference 2017 CSIR International Conference Centre 10 July 2017 Thank you Context Introduction Introduction Context Context ID: 647727
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COMPRESSIVE
STRENGTH OF A CONCRETE MIX FOR PAVEMENT BLOCKS INCORPORATING INDUSTRIAL
BY-PRODUCT
R
Mokoena
and M. B Mgangira
Southern Africa Transport Conference 2017
CSIR International Conference Centre
10 July 2017Slide2
Thank you
ContextSlide3
Introduction
Introduction
ContextSlide4
Context
Introduction
Optimisation in the use of industrial by-productsImprovement in workabilityusing a biological activator Slide5
Context
Introduction
To evaluate the use of microbes, microbial derived metabolites and other biodegradable and eco-friendly additives for stabilisation and compaction. Slide6
Thank you
Initiatives
at CSIR
Horak
and Maree (1982)
Slag as base in trial sectionsSlide7
Thank you
To provide coherent body of knowledge on alternative materials
Review available test procedures for assessment
Establish best material preparation
Explore possible modifications to improve suitability
Establish the required adaptation for use
Overall: Guideline documents for specific materials
ContextSlide8
Material characterization
Longitudinal Cracking
MicrostructureSlide9
Material characterisation
Longitudinal Cracking
Microstructure Energy Dispersive Spectroscopy(EDS) Slide10
Material characterization
The target strength for the concrete 30
MpaCompressive strength tests were conducted according to SANS 5863. The cast concrete cubes were tested at 7, 14, 28 and 56 days. Each test batch was prepared for a specific age.
Improvement in workability Use of a biological activator to improve the workability of the concrete.
Products of fermentation processes. They consist of fermented organic matter, water, and other proprietary ingredients. Slide11
Material characterization
Concrete mixes with the
activator are labelled as 5A, 5B, 8A and 8B.Slide12
Strength development for mixes 1, 2 and 3 with w:b = 0.46
Severe RuttingSlide13
Strength development for mixes 4, 5 and 6 with w:b = 0.36
Extent of investigation depends on the
client requirements Slide14
Strength development for mixes 8 and 9 with w:b = 0.28
Extent of investigation depends on the
client requirements Slide15
Achievable strength
28-day
compressive strength,
MPa
56-day compressive strength,MPaSlide16
Slump of mixes with Biological activitor
Combination of failuresSlide17
Strength of mixes with Biological activator
Unawareness
InexperienceMistakes such as noncompliance
Slips and lack of attention
Addition of biological activator slightly improved workability, a reduction in compressive strength was also observed with an increase in activatorSlide18
Conclusion
Unawareness
InexperienceMistakes such as noncompliance
Slips and lack of attentionIdentified optimised mixture for required strength for block pavingAddition of biological activator slightly improved workability, a reduction in compressive strength was also observed with an increase in
activatorSlide19
Way Forward
Unawareness
InexperienceMistakes such as noncompliance
Slips and lack of attentionAssessment of the durability of the selected mix with particular reference to concrete block paving and incorporating other “by-products materials” into the concrete mix in order to produce a functional concrete paving block system in support of the principle of sustainably-oriented road infrastructure development
.Improved Biological activatorSlide20
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