Energy efficient Cementitious Material : an option for low cost housing schemes
- Agbenyeku, Emmanuel Emem-Obong, Muzenda, Edison, Msibi, Innocent Mandla
- Authors: Agbenyeku, Emmanuel Emem-Obong , Muzenda, Edison , Msibi, Innocent Mandla
- Date: 2015
- Subjects: Rice Husk Ash (RHA) , Agricultural waste , Pozzolanas
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/73948 , uj:18475 , Citation: Agbenyeku, E.E., Muzenda, E. & Msibi, I.M. 2015. Energy efficient Cementitious Material : an option for low cost housing schemes.
- Description: Abstract: Energy efficient and cost saving cement alternatives have been identified for use by researchers without compromising standards. The utilization of artificial pozzolanas as Cementitious Materials (CMs) in cement chemistry and engineering is widely known. Nevertheless, there is continual search for optional and greener substitutes. The use of Rice Husk Ash (RHA) as CM was studied. The abundance of RHA and the need for low cost shelter triggered this investigation looking into chemical composition of the generated ash and the compressive strength of the concrete type produced by partly replacing Ordinary Portland Cement (OPC) with RHA under short hydration periods. 60 cubes of 300 mm dimensions were cast with cement substituted by RHA ranging from 0-40%, adopting 28 day targeted strength of 25 MPa as control. Specimens hydrated at relative humidity (RH) of 95-100% and temperature (T) of 22-25 0 C in a chamber for 7, 14, 21, and 28 days. Results revealed trends of strength gain and reduced density with increase in RHA. The 28 day density and strength of the control specimen was 2465 kg/m3 and 28.6 MPa while the 10% RHA sample (i.e. best replaced matrix) had 2398 kg/m3 and 26.0 MPa respectively. The strength of 10% RHA/OPC product (26.0 MPa) was slightly higher than the adopted strength (25 N/mm2) at 28 days. This can serve as cost saving means in rural housing schemes with less structural demands.
- Full Text:
- Authors: Agbenyeku, Emmanuel Emem-Obong , Muzenda, Edison , Msibi, Innocent Mandla
- Date: 2015
- Subjects: Rice Husk Ash (RHA) , Agricultural waste , Pozzolanas
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/73948 , uj:18475 , Citation: Agbenyeku, E.E., Muzenda, E. & Msibi, I.M. 2015. Energy efficient Cementitious Material : an option for low cost housing schemes.
- Description: Abstract: Energy efficient and cost saving cement alternatives have been identified for use by researchers without compromising standards. The utilization of artificial pozzolanas as Cementitious Materials (CMs) in cement chemistry and engineering is widely known. Nevertheless, there is continual search for optional and greener substitutes. The use of Rice Husk Ash (RHA) as CM was studied. The abundance of RHA and the need for low cost shelter triggered this investigation looking into chemical composition of the generated ash and the compressive strength of the concrete type produced by partly replacing Ordinary Portland Cement (OPC) with RHA under short hydration periods. 60 cubes of 300 mm dimensions were cast with cement substituted by RHA ranging from 0-40%, adopting 28 day targeted strength of 25 MPa as control. Specimens hydrated at relative humidity (RH) of 95-100% and temperature (T) of 22-25 0 C in a chamber for 7, 14, 21, and 28 days. Results revealed trends of strength gain and reduced density with increase in RHA. The 28 day density and strength of the control specimen was 2465 kg/m3 and 28.6 MPa while the 10% RHA sample (i.e. best replaced matrix) had 2398 kg/m3 and 26.0 MPa respectively. The strength of 10% RHA/OPC product (26.0 MPa) was slightly higher than the adopted strength (25 N/mm2) at 28 days. This can serve as cost saving means in rural housing schemes with less structural demands.
- Full Text:
Green concrete as a useful resource in low-cost rural housing and development
- Agbenyeku, Emmanuel, Aigbavboa, Clinton
- Authors: Agbenyeku, Emmanuel , Aigbavboa, Clinton
- Date: 2016
- Subjects: Agricultural waste , Cassava peels ash , Compressive strength laterite
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/93021 , uj:20298 , Citation: Agbenyeku, E. & Aigbavboa, C. 2016. Green concrete as a useful resource in low-cost rural housing and development.
- Description: Abstract: The study utilized two locally abundant materials; Cassava Peels Ash (CPA) and Laterite as constituents for rural projects. The availability of these materials in West-Africa permitted the study. Partly blending Ordinary Portland Cement (OPC) and Sand with an agricultural waste-CPA and Laterite respectively against the effect of short term hydration on the products compressive strength was investigated. 192 cubic specimens of 100 mm dimensions were cast and cured in water for 7, 14, 21, and 28 days, adopting a control of 28 day-25 N/mm2 targeted strength. The OPC/CPA and sand/laterite substitute ratios were 0-30% with views to determine the best substitute matrix. Density and compressive strength decreased with increased CPA and laterite content. However, strength development increased over hydration ages. 28 days density and compressive strength of the normal concrete was 2385 kg/m3 and 27.05 N/mm2 while the best matrix (10% CPA+10% laterite) had 2322 kg/m3 and 25.57 N/mm2 respectively. The strength of the green concrete was higher than the adopted strength at 28 days, which makes it suitable for use. It can be used without compromising standards in simple foundations and masonry units as a prime cost reduction in rural housing and development.
- Full Text:
- Authors: Agbenyeku, Emmanuel , Aigbavboa, Clinton
- Date: 2016
- Subjects: Agricultural waste , Cassava peels ash , Compressive strength laterite
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/93021 , uj:20298 , Citation: Agbenyeku, E. & Aigbavboa, C. 2016. Green concrete as a useful resource in low-cost rural housing and development.
- Description: Abstract: The study utilized two locally abundant materials; Cassava Peels Ash (CPA) and Laterite as constituents for rural projects. The availability of these materials in West-Africa permitted the study. Partly blending Ordinary Portland Cement (OPC) and Sand with an agricultural waste-CPA and Laterite respectively against the effect of short term hydration on the products compressive strength was investigated. 192 cubic specimens of 100 mm dimensions were cast and cured in water for 7, 14, 21, and 28 days, adopting a control of 28 day-25 N/mm2 targeted strength. The OPC/CPA and sand/laterite substitute ratios were 0-30% with views to determine the best substitute matrix. Density and compressive strength decreased with increased CPA and laterite content. However, strength development increased over hydration ages. 28 days density and compressive strength of the normal concrete was 2385 kg/m3 and 27.05 N/mm2 while the best matrix (10% CPA+10% laterite) had 2322 kg/m3 and 25.57 N/mm2 respectively. The strength of the green concrete was higher than the adopted strength at 28 days, which makes it suitable for use. It can be used without compromising standards in simple foundations and masonry units as a prime cost reduction in rural housing and development.
- Full Text:
Impact of agricultural waste additive on 1-dimensional clay consolidation behaviour
- Agbenyeku, Emem-Obong Emmanuel, Muzenda, Edison, Msibi, Innocent Mandla
- Authors: Agbenyeku, Emem-Obong Emmanuel , Muzenda, Edison , Msibi, Innocent Mandla
- Date: 2014
- Subjects: Rice husk ash , Kaolinitic clay , Soil treatment , Soil consolidation , Soil stabilization , Agricultural waste , Landfills , Fills (Earthwork)
- Type: Article
- Identifier: http://ujcontent.uj.ac.za8080/10210/386034 , uj:5050 , http://hdl.handle.net/10210/13589
- Description: Soil treatment is of vital concern in geoenvironmental and construction engineering in present times as suitable naturally occurring materials are rapidly depleted. Efforts are continually invested towards the resourceful utilization of wastes as fillers, cement enhancers, stabilizers and blenders with little or no significant impacts on the environment. This paper explains the use of a locally available and abundant agricultural waste- Rice husk ash (RHA) in West Africa, Nigeria for the treatment and stabilization of kaolinitic clay (KC) sampled from an active landfill site in Johannesburg, South Africa. The impact of incorporating different percentages of RHA on the compressibility characteristics of a parent compressible landfill KC sample was investigated under a One-dimensional consolidation test. Compacted soil specimens were treated at optimum water content (OWC) and maximum dry unit weight (MDUW) by the addition of agricultural waste material to the parent KC. The compacted specimens were subjected incremental vertical loading in a fixed ring consolidometer device. This was done with a view to closely simulate the waste loading effects from a typical landfill on a treated and parent clay/clayey bottom barrier based on one-dimensional consolidation behaviours. The introduction of RHA waste material to the parent KC revealed an outcome with substantial improvements in compaction characteristics. Hence, the results presented herein showed the agricultural waste to positively increase one-dimensional rigidity while settlement was effectively decreased. From results and analysis, the KC stabilized with RHA can withstand loadings from waste heaps under conditions as were applied in this study. With due recommended examination by geoenvironmental specialists, the stabilized material may be considered as an environmental and cost saving beneficiation approach for use in landfill liners.
- Full Text:
- Authors: Agbenyeku, Emem-Obong Emmanuel , Muzenda, Edison , Msibi, Innocent Mandla
- Date: 2014
- Subjects: Rice husk ash , Kaolinitic clay , Soil treatment , Soil consolidation , Soil stabilization , Agricultural waste , Landfills , Fills (Earthwork)
- Type: Article
- Identifier: http://ujcontent.uj.ac.za8080/10210/386034 , uj:5050 , http://hdl.handle.net/10210/13589
- Description: Soil treatment is of vital concern in geoenvironmental and construction engineering in present times as suitable naturally occurring materials are rapidly depleted. Efforts are continually invested towards the resourceful utilization of wastes as fillers, cement enhancers, stabilizers and blenders with little or no significant impacts on the environment. This paper explains the use of a locally available and abundant agricultural waste- Rice husk ash (RHA) in West Africa, Nigeria for the treatment and stabilization of kaolinitic clay (KC) sampled from an active landfill site in Johannesburg, South Africa. The impact of incorporating different percentages of RHA on the compressibility characteristics of a parent compressible landfill KC sample was investigated under a One-dimensional consolidation test. Compacted soil specimens were treated at optimum water content (OWC) and maximum dry unit weight (MDUW) by the addition of agricultural waste material to the parent KC. The compacted specimens were subjected incremental vertical loading in a fixed ring consolidometer device. This was done with a view to closely simulate the waste loading effects from a typical landfill on a treated and parent clay/clayey bottom barrier based on one-dimensional consolidation behaviours. The introduction of RHA waste material to the parent KC revealed an outcome with substantial improvements in compaction characteristics. Hence, the results presented herein showed the agricultural waste to positively increase one-dimensional rigidity while settlement was effectively decreased. From results and analysis, the KC stabilized with RHA can withstand loadings from waste heaps under conditions as were applied in this study. With due recommended examination by geoenvironmental specialists, the stabilized material may be considered as an environmental and cost saving beneficiation approach for use in landfill liners.
- Full Text:
- «
- ‹
- 1
- ›
- »