scholarly journals Construction and Leakage Detection of a Dome-Type Biogas Digester in a Village at Abuja, Nigeria

2017 ◽  
Vol 2 (1) ◽  
Author(s):  
Boniface Oloche ◽  
Idris Ibrahim Ozigi ◽  
Kafayat Adeyemi ◽  
Elias Ikpe
Keyword(s):  
High Strength Concrete ◽  
Pressure Gauge ◽  
High Strength ◽  
Careful Examination ◽  
Leakage Detection ◽  
Cylindrical Wall ◽  
Level Difference ◽  
Pressure Test ◽  
Local Materials ◽  
Liquid Manometer

This work presents construction and leakage detection of dome-type biogas digester. The constructed biogas digester with local materials is rated at 10m3 capacity. The biogas digester foundation, cylindrical wall and dome vault were about 10 cm thick and made of high strength concrete in kilogram at ratio of cement, sharp sand and aggregate of 12 mm size as 111:1:1.2. The constructed biogas digester was pressure tested by using liquid manometer. The pressure gauge level difference of 48 cm (4.7 KN/m2) was obtained, which later dropped to less than 20 cm (1.96 KN/m2)indicating presence of leakage in the biogas digester. Cracks in the biogas digester were located after a careful examination at the cylindrical wall and dome top, which were scaled and sealed with wet cement. The pressure test wasagain conducted and yielded pressure gauge level difference of 60 cm(5.88 KN/m2), without dropping for over 20 minutes, which implies no leakage in the biogas digester.

scholarly journals Properties of Reactive Powder Concrete Using Local Materials and Various Curing Conditions

2019 ◽  
Vol 4 (6) ◽  
pp. 74-83 ◽  
Author(s):  
Gamal I. K. ◽  
K. M. Elsayed ◽  
Mohamed Hussein Makhlouf ◽  
M. Alaa
Keyword(s):  
Compressive Strength ◽  
Silica Fume ◽  
High Strength Concrete ◽  
Steel Fiber ◽  
High Strength ◽  
Hot Water ◽  
Reactive Powder Concrete ◽  
Normal Water ◽  
Reactive Powder ◽  
Local Materials

Reactive Powder Concrete RPC is comprise of (cement, quartz powder, sand, and superplasticizer) mixture with low water/cement ratio. It has not coarse aggregates and characterized by highly dense matrix, high strength concrete, excellent durability, and economic. This study aims to investigate fresh and hardened properties of locally cast RPC with several available economical materials such as silica fume (SF), fly ash (FA), steel fiber (STF), and glass fiber (GF). Experimental investigation were performed to study the effectiveness of partial replacement of cement by SF or FA to reach ultra-high strength concrete, effect of additional materials STF or GF in order to improve the fracture properties of the RPC mixes, and influence of the treated with normal water as well as with hot water. Fifteen different RPC mixes were cast with 20, 25, 30, and 35% cement replacement by SF, 25% cement replacement by FA, and another proportions taken combination between SF and FA with percentages 15, 20, 25% FA and constant 10% SF. Varying fiber types (steel fiber or glass fiber) added to concrete by different percentages 1, 2, and 3%. Specimens were treated with normal water 25ᵒC and hot water at 60ᵒC and 90ᵒC by 2 mixes with silica fume content 25% of binder and steel fiber content 2% by total volume. Performance of the various mixes is tested by the slump flow, compressive strength, flexure strength, splitting tensile strength, and density. The production of RPC using local materials is successfully get compressive strength of 121 MPa at the age of 28 days at standard conditions and normal water curing 25°C with Silica fume content 25% of binder and steel fiber content 2% by total volume of RPC and water/binder ratio of 0.25.  The results also showed the effect of curing by hot water 60 and 90°C, it is observed that compressive strength increases proportionally with curing temperatures and a compressive strength of 149.1 MPa at 90°C for 1days was obtained.

PRODUCTION OF ULTRA HIGH-STRENGTH CONCRETE USING LOCAL MATERIALS

2013 ◽  
Vol 36 (1) ◽  
pp. 91-100 ◽  
Author(s):  
M. .M. Kamal ◽  
M. A. Safan ◽  
Z. A. Etman ◽  
R. A. Salam
Keyword(s):  
High Strength Concrete ◽  
High Strength ◽  
Strength Concrete ◽  
Local Materials

Investigation on Performance of Concrete Incorporating Silica Fume and Local UAE Materials

2019 ◽  
Vol 803 ◽  
pp. 222-227 ◽  
Author(s):  
Reem Sabouni ◽  
Hassan Raad Abdulhameed
Keyword(s):  
Mechanical Properties ◽  
Silica Fume ◽  
United Arab Emirates ◽  
High Strength Concrete ◽  
High Strength ◽  
Partial Replacement ◽  
Favorable Effect ◽  
Experimental Program ◽  
Strength Concrete ◽  
Local Materials

In an effort to reduce the amount of cement in the concrete industry and produce greener concrete, emphasis was put on using several industrial by-products such as silica fume, fly ash and slag as partial replacements for cement in concrete. Due to the enormous number of mega reinforced concrete projects constructed in the United Arab Emirates, it is considered to be one of the largest consumers of high strength concrete in the region. On the other hand, only limited research has been done on high strength concrete incorporating local materials in the UAE. The main objective of this research is to conduct an investigation on the performance of high strength concrete containing silica fume as partial replacement of ordinary Portland cement incorporating superplasticizers and local UAE materials by studying its mechanical properties and durability. The experimental program involved two groups: The first group had a water-to-binder material ratio (w/b) of 0.4, whereas, the second group had w/b = 0.3. For both groups the silica fume replacement percentages were 0 (control mix) 5, 7.5, 10, 12.5, and 15 percent. The mechanical properties were tested at 7, 28, and 91 days and the durability tests were performed at 28 days. The results were compared to the control mix and they showed that for all the curing ages studied the use of silica fume as partial replacement of OPC has favorable effect on the compressive strength values and the optimum replacement ratios of silica fume for the tested specimens are found to be at 12.5% and 10% replacement for the w/b ratios of 0.3 and 0.4, respectively. For all the four performed durability tests the replacement of the OPC with silica fume is found to have favorable results and the higher the silica fume percentage replacement of OPC the more favorable the results are. The detailed description of the used mixes and the main conclusions drawn from this research are presented in this paper

Numerical Simulation Used for High Strength Concrete under Impact Loading

2012 ◽  
Vol 193-194 ◽  
pp. 736-739
Author(s):  
Yao Qiu Long ◽  
Guo Ping Jiang
Keyword(s):  
Numerical Simulation ◽  
High Pressure ◽  
Impact Loading ◽  
High Strength Concrete ◽  
Pressure Gauge ◽  
High Strength ◽  
Strength Concrete ◽  
Gas Gun ◽  
Pressure Time ◽  
Planar Impact

The process of concrete under symmetric impact was experimentally investigated in the case of primary gas gun and was analyzed .The shock properties of C100 concrete is investigated by gas gun planar impact technique. The manganin pressure gauge is used to measure the pressure-time curves of the samples. The parameters of high-pressure equation are obtained by the numerical simulation. Numerical simulation is a necessary complement to the test. The spall phenomenon is observed by the numerical simulation.

scholarly journals BEHAVIOR AND DURABILITY OF HIGH AND ULTRA HIGH STRENGTH CONCRETE MANUFACTURED BY LOCAL MATERIALS

2011 ◽  
Vol 39 (4) ◽  
pp. 811-826
Author(s):  
Walid El- Sayed ◽  
Dina M. Sadek ◽  
Basuoni Ibrahim Al- Samahy
Keyword(s):  
High Strength Concrete ◽  
High Strength ◽  
Strength Concrete ◽  
Local Materials

Study on Strength Development of High Strength Concrete Containing Alccofine and Fly-Ash

2012 ◽  
Vol 2 (3) ◽  
pp. 102-104 ◽  
Author(s):  
Suthar Sunil B ◽  
◽  
Dr. (Smt.) B. K. Shah Dr. (Smt.) B. K. Shah
Keyword(s):  
Fly Ash ◽  
High Strength Concrete ◽  
High Strength ◽  
Strength Development ◽  
Strength Concrete
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