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Objective of the Research

To determine which between CCA and RHA could be better used in the construction industry as a construction material

This study determined the mechanical properties of concrete specimen with Corn Cob Ash (CCA) and with Rice Husk Ash (RHA). Specifically, this study has:

  • Determined the workability, compressive and flexural strengths of concrete with specified cement, sand and gravel of the following classes:

1.1 Class A (1:2:3) with the corresponding weight of CCA

  • 1.1.1 AC1 Mixture (5% by weight of cement)
  • 1.1.2 AC2 Mixture (10% by weight of cement)
  • 1.1.3 AC3 Mixture (15% by weight of cement)

1.2 Class A (1:2:3) with the corresponding weight of RHA

  • 1.2.1 AR1 Mixture (5% by weight of cement)
  • 1.2.2 AR2 Mixture (10% by weight of cement)
  • 1.2.3 AR3 Mixture (15% by weight of cement)
  • Compared the workability of each mixture.

Statement of the Problems

1. Mechanical Properties considered

  • Workability
  • Compressive strength
  • Flexural strength

2. Total number of Specimen

  • 18 Cylindrical (For Compression Test)
  • 18 Rectangular (For Flexural Test)

3. Molding of Specimen:

  • 24 hours

4. Curing Period at University Hydraulics Laboratory:

  • 28 days

5. Class A Concrete (1:2:3)

6. The Percentage of Replacement

  • 5%, 10% and 15%

7. Compressive and Flexural Strength Test by UTM at NDDU Construction Materials Testing Laboratory

Scope and Delimitation

Method and Procedures

1 Sampling Method (AASHTO T2)

2 Reducing samples to testing size (by quartering)

3 Determining amount in weight of CCA and RHA

4 Preparation of concrete specimens

5 Testing for workability

6 Molding Process

7 Curing of concrete specimen

8 Standard Test Method for Compressive Strength of Cylindrical Specimens (ASTM C 39)

9 Flexural Tests (ASTM C 293 – Center-Point Loading Test Method)

One-way Analysis of Variance (ANOVA)

Tukey Method

Results

Discussion and Recommendations

Only mixtures of 5% and 10% Rice Husk Ash (RHA) and Corn Cob Ash (CCA) as replacement to Cement for Class A concrete mix reached the required Compressive Strength.

Nevertheless, Rice Husk Ash (RHA) and Corn Cob Ash (CCA) passed the strength requirement for Flexural.

  • Since CCA developed a reasonably higher Strength, therefore, this study considered Corn Cob Ash (CCA) to be better used as a construction material.

The study chooses the use of concrete with CCA as an alternative construction material.

  • Therefore, mixing the said ash in the concrete mixture could be considered one of the means in reducing the potential of Corn Cob as waste.

Fabricate multiple specimens

Make sure that the aggregates used for the specimen preparation does not vary over the change in weather

Use only homogenous ashes

Use varying water/cement ratio

Cap each cylindrical specimen before testing

Use other type of ash

Conduct a cost analysis

Consider the Chemical Effects

Develop efficient means of producing ashes in bigger volume.

“The Mechanical Properties of Concrete Mixed with Corn Cob Ash (CCA) and Rice Husk Ash (RHA)”

Outline

Recommendations for future similar studies:

Figure 2

The Flexural Strengths

  • Compared the compressive strength of concrete mixed with 5% CCA, 10% CCA and 15% CCA
  • Compared the compressive strength of concrete mixed with 5% RHA, 10% RHA and 15% RHA.
  • Compared the Flexural strength of concrete mixed with CCA to the required Flexural strength of concrete at 28-day curing period.
  • Compared the Compressive strength of concrete mixed with CCA to the required compressive strength of concrete at 28-day curing period.
  • Compared the flexural strengths of concrete mixed with RHA and concrete mixed with CCA.
  • Compared the flexural strength of concrete mixed with 5% RHA, 10% RHA and 15% RHA.
  • Compared the Compressive strength of concrete mixed with RHA to the required compressive strength of concrete at 28-day curing period.
  • Compared the flexural strength of concrete mixed with 5% CCA, 10% CCA and 15% CCA.
  • Compared the Flexural strength of concrete mixed with RHA to the required Flexural strength of concrete at 28-day curing period.
  • Compared the compressive strength of concrete mixed with RHA and concrete mixed with CCA.

Figure 1

The Compressive Strengths

Adviser:

Engr. Shiela Jingle A. Soriño, CE, MA-EE

Researchers:

Janno Franco J. Pilapil, BS-Civil Engineering

Mark Jay B. Tadeje, BS-Civil Engineering

II.) Data Analysis

I.) Experimental Procedures

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