Improving the compressive strength of mortar from a binder of fly ash-calcium carbide residue

In Vietnam, calcium carbide residue (CCR) from the acetylene gas factories are not properly treated, causing serious environmental pollution. Based on mineral composition determined by XRD, calcium carbide residue consisted mainly of portlandite (70-72%), calcite (14-16%), hydrocalumite (6-8%), and chemical composition determined by XRF method composed of CaO (53.02%), LOI (39.72%). This calcium carbide residue can be used as a source of hydrated lime, mixed with fly ash, sand, and cement to produce non-calcined bricks and test results show that brick specimens achieved compressive strength 3.0-7.5 MPa, water absorption 12.3-17.5%, density 1.28-1.80kg/cm3. The test bricks satisfied Vietnamese standards for construction bricks.

Download Full-text

Strength Development and Microstructural Investigation of Calcium Carbide Residue and Fly Ash Prepared with Optimized Alternative Green Binders

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.904.429 ◽

2021 ◽

Vol 904 ◽

pp. 429-434

Author(s):

Papantasorn Manprom ◽

Phongthorn Julphunthong ◽

Pithiwat Tiantong ◽

Tawat Suriwong

Keyword(s):

Compressive Strength ◽

Fly Ash ◽

Raw Materials ◽

Extended Period ◽

Calcium Carbide ◽

Pozzolanic Reaction ◽

Strength Development ◽

Chemical Compositions ◽

Microstructural Investigation ◽

Calcium Carbide Residue

The development of new environmentally friendly binder from calcium carbide residue and fly ash wastes were investigated in this study. The key point of this work is difference to several previous investigations in that the optimized mixture proportion of the raw materials were calculated based on their chemical composition and their reaction. The compressive strength development over the curing age was also compared with reference mortar created with OPC binder. Mortar cubes were cast from the mix containing the calcium carbide residue and fly ash, at the optimized ratio. The compressive strength of the mortar was then monitored over an extended period: at 56 days it was 10.66 MPa, which is approximately 47% of the reference mortar. The morphologies and chemical compositions of the developed mortar showed the presence of spherically shaped of unreacted fly ash powder particles embedded in a cement C–S–H gel resulting from the pozzolanic reaction of raw materials.

Download Full-text

Research on the use of calcium carbide residue from the acetylene gas manufacturing factory to produce non-calcined brick

Vietnam Journal of Earth Sciences ◽

10.15625/0866-7187/0/0/14954 ◽

2020 ◽

Vol 42 (2) ◽

pp. 141-151

Author(s):

Nguyen Anh Duong ◽

Phan Luu Anh ◽

Tran Thi Man ◽

Tran Thi Lan

Keyword(s):

Compressive Strength ◽

Fly Ash ◽

Chemical Composition ◽

Environmental Pollution ◽

Water Absorption ◽

Mineral Composition ◽

Calcium Carbide ◽

Hydrated Lime ◽

Test Results ◽

Calcium Carbide Residue

In Vietnam, calcium carbide residue (CCR) from the acetylene gas factories are not properly treated, causing serious environmental pollution. Based on mineral composition determined by XRD, calcium carbide residue consisted mainly of portlandite (70-72%), calcite (14-16%), hydrocalumite (6-8%), and chemical composition determined by XRF method composed of CaO (53.02%), LOI (39.72%). This calcium carbide residue can be used as a source of hydrated lime, mixed with fly ash, sand, and cement to produce non-calcined bricks and test results show that brick specimens achieved compressive strength 3.0-7.5 MPa, water absorption 12.3-17.5%, density 1.28-1.80kg/cm3. The test bricks satisfied Vietnamese standards for construction bricks.

Download Full-text