Assessing Cement Stabilized Rammed Earth Durability in A Humid Continental Climate
Abstract
:1. Introduction
1.1. Rammed Earth
1.2. Characteristics of a Humid Continental Climates
1.3. Standardized Properties of Rammed Earth
1.4. Aim of the Research
2. Materials and Methods
2.1. Materials
2.2. Methods
2.2.1. Preparation of Samples
2.2.2. Composition of the Soil Mixtures
- -
- the higher the gravel content of the mixture, the lower the optimum moisture content;
- -
- the higher the content of the clay fraction in the mixture, the higher the optimal moisture content; and,
- -
- the higher the content of cement added to the mixture, the higher the optimal moisture content.
2.2.3. Compressive Strength
2.2.4. Methods for Durability Assessment and Criterial Values
2.2.5. Linear Shrinkage
2.2.6. Water Erosion Resistance
2.2.7. Wet to Dry Compressive Strength Ratio
2.2.8. Frost Resistance
3. Results
3.1. The Analysis of Linear Shrinkage Deformation Development
3.2. Influence of Soil Mix Characteristics on Water Erosion Resistance
3.3. Wet to Dry Compressive Strength Ratio Investigation
3.4. Rammed Earth Frost Resistance
4. Discussion
5. Conclusions
- -
- content of 30% gravel fraction (2-4 mm) in the soil mixture, which is confirmed by the recommended grain size are softening index a given in the literature, and
- -
- stabilization of the mixture with CEM I 42.5 R cement in the amount of not less than 9% of other dry components.
Author Contributions
Funding
Conflicts of Interest
References
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Document | Ref. | Country | Properties of the Soil mixture | Properties of the Material | |||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Mechanical Strength | Durability | ||||||||||
Granulation | Organic substances | Soluble salts | Plasticity | Compressive strength | Tensile strength | Linear shrinkage | Frost resistance | Resistance to water | |||
CSIRO Bulletin 5, 4th ed. (1995) | [15] | Australia | X | X | X | ||||||
EBAA (2004) | [16] | X | X | X | |||||||
HB 195-2002 | [17] | X | X | X | |||||||
NBR 13553 (1996) | [18] | Brazil | The standard does not contain numerical requirements | ||||||||
Lehmbau Regeln (2009) | [19] | Germany | X | X | X | X | |||||
IS: 2110 (1998) | [20] | India | X | X | X | X | |||||
IS: 13827 (1998) | [21] | X | X | ||||||||
PCH-2-87 (1988) | [22] | Kyrgyzstan | X | X | X | X | |||||
NZS 4297 (1998) | [23] | New Zealand | X | X | X | X | X | ||||
NZS 4298 (1998) | [12] | ||||||||||
NZS 4299 (1998) | [24] | ||||||||||
14.7.4 NMAC (2006) | [25] | USA | X | X | X | X | |||||
ASTM 2392/E2392M (2010) | [26] | The standard does not contain numerical requirements | |||||||||
ASTM D 560 (1996) | [27] | X | |||||||||
ASTM D559 (2003) | [28] | X | |||||||||
SAZS 724 (2001) | [29] | Zimbabwe | X | X | X | X | |||||
BN-62/6738-01 | [30] | Poland | X | X | X | X | |||||
BN-62/6738-02 | [31] | ||||||||||
MOPT Tapial (1992) | [32] | Spain | X | X | X |
Mineral Composition [%] | |||||||||||||
Component | Clay Minerals | Including: | Goethite | Siderite | Carbonates | Organic substance | Quartz and other | ||||||
Beidellite | Kaolinite | Illite | |||||||||||
Content [%] | 43.7 | 8.9 | 8.6 | 26.2 | - | 6.0 | - | 0 | 50.3 | ||||
Chemical composition [%] | |||||||||||||
Component | SiO2 | Al2O3 | Fe2O3 | K2O | CaO | TiO2 | Other oxides | ||||||
Content, [%] | 61.78 | 19.63 | 10.65 | 3.18 | 0.66 | 0.89 | 0.33 |
Mixture Symbol | Sand | Gravel | Silt + Clay | Cement | Water |
---|---|---|---|---|---|
703 0% CEM I | 1465 | 0 | 628 | 0 | 209 |
703 6% CEM I | 1391 | 0 | 596 | 119 | 211 |
703 9% CEM I | 1357 | 0 | 582 | 174 | 211 |
433 0% CEM I | 893 | 670 | 670 | 0 | 156 |
433 6% CEM I | 830 | 622 | 622 | 124 | 176 |
433 9% CEM I | 792 | 594 | 594 | 178 | 194 |
Table | National Annex to PN-EN 206+A1 [51] | ASTM D 560 [27] |
---|---|---|
Maturation time of samples | 28 days | 7 days |
Maturation conditions | Temperature 18 ± 2 °C, relative humidity above 90% | Temperature 21 °C ± 1.7 °C, relative humidity 100% |
Shape and dimensions of samples | Cube with 100 mm side | Cylinder 102 mm in diameter and 116.4 mm in height |
Preparation of samples for testing | Saturation of samples with water to constant mass | Drying of samples to constant mass at 110 °C |
Temperature of freezing the samples | −18 ± °C | −23 °C |
Time of freezing | 4 h | 24 h |
Time of defrosting | 2–4 h | 23 h |
Method of defrosting the samples | Defrosting in water with the temperature of 18 ± 2 °C | Defrosting in open air T= 21 °C ± 1.7 °C, RH = 100% |
Number of freezing and defrosting cycles | Minimum 25 | 12 |
Sizes tested | loss of weight in samples decrease in compressive strength | loss of weight in samples |
Criteria for assessing resistance to frost | The samples do not show cracking, average loss in mass ≤5%, decrease in compressive strength ≤20%. | No guidelines |
0 % Cement | 6% Cement | 9% Cement | |||
---|---|---|---|---|---|
703 | 433 | 703 | 433 | 703 | 433 |
0.46% | 0.42% | 0.36% | 0.34% | 0.33% | 0.24% |
Test Time, [min] | 433 | 703 | 433 | 703 | 433 | 703 |
---|---|---|---|---|---|---|
9% CEM I | 6% CEM I | 0% CEM I | ||||
Depth of erosion D, mm | ||||||
15 | 1 | 0 | 1 | 0 | 3 | 24 |
30 | 1 | 1 | 2 | 0 | 9 | 33 |
45 | 1 | 2 | 2 | 0 | 15 | 45 |
60 | 1 | 2 | 2 | 0 | 20 | 53 |
Ratio of susceptibility to water erosion | 1 | 1 | 1 | 1 | 2 | 3 |
Test conditions set for Phase II | ||||||
Time of water exposure in [min] | 4 | 4 | 4 | 4 | 2 | 1 |
Number of cycles | 6 |
Composition of the Soil Mixture | Condition of the Surface of the Control Sample | Stage I | Stage II | ||
---|---|---|---|---|---|
Erodibility Ratio (from Table 7) | Time of Water Exposure | Changes of the Surface of the Sample after the Exposure | Result of the Verification Phase | ||
433 0% CEM | no damage | 2 | 6 × 2 min | deep losses on the surface of the whole sample | negative |
703 0% CEM | 3 | 6 × 1 min | |||
433 6% CEM | 1 | 6 × 4 min | no damage | positive | |
703 6% CEM | |||||
433 9% CEM | |||||
703 9% CEM |
Mixture Symbol | Montmorillonite [%] | Beidellite [%] | Kaolinite [%] | Illite [%] | Goethite [%] | Siderite [%] | Calcite [%] | Organic Substance [%] | Quartz and Others [%] | Cement Addition [%] | Compressive Strength [MPa] |
---|---|---|---|---|---|---|---|---|---|---|---|
MC III 6% | 0.0 | 6.6 | 1.9 | 0.0 | 0.9 | 0.0 | 13.1 | 0.1 | 77.3 | 6 | 6.96 |
MC III 9% | 9 | 8.76 | |||||||||
MC IV 6% | 0.0 | 0.0 | 21.8 | 0.0 | 0.3 | 0.0 | 0.0 | 0.1 | 77.8 | 6 | 4.51 |
MC IV 9% | 9 | 5.63 | |||||||||
MC V 6% | 0.0 | 0.0 | 21.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 78.7 | 6 | 4.30 |
MC V 9% | 9 | 5.45 | |||||||||
MC X 6% | 3.0 | 4.1 | 6.9 | 2.9 | 0.0 | 1.1 | 0.0 | 0.4 | 81.7 | 6 | 3.60 |
MC X 9% | 9 | 4.27 | |||||||||
Legend [%] | 0.1–1 | 1–5 | 5–10 | 10–25 | >25 |
Criterion and Critical Value | 0 % Cement | 6% Cement | 9% Cement | |||||
---|---|---|---|---|---|---|---|---|
703 | 433 | 703 | 433 | 703 | 433 | |||
Linear shrinkage < 0.5% | 0.46% | 0.42% | 0.36% | 0.34% | 0.33% | 0.24% | ||
Resistance to water erosion | Ratio of susceptibility to water erosion ≤ 2 | 3 | 2 | 1 | 1 | 1 | 1 | |
Surface condition after exposure to water | Deep losses on the surface of the whole sample | No damage | ||||||
Wet to dry compressive strength ratio > 0.33 | Not tested | 0.33 | 0.44 | 0.42 | 0.43 | |||
Frost resistance after 25 cycles | Compressive strength decrease < 20% | Not tested | 100% | 100% | 5.8% | 6.3% | ||
Mass loss < 5% | Not tested | 7.24% | 7.24% | 6.36% | 2.51% |
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Narloch, P.; Woyciechowski, P. Assessing Cement Stabilized Rammed Earth Durability in A Humid Continental Climate. Buildings 2020, 10, 26. https://doi.org/10.3390/buildings10020026
Narloch P, Woyciechowski P. Assessing Cement Stabilized Rammed Earth Durability in A Humid Continental Climate. Buildings. 2020; 10(2):26. https://doi.org/10.3390/buildings10020026
Chicago/Turabian StyleNarloch, Piotr, and Piotr Woyciechowski. 2020. "Assessing Cement Stabilized Rammed Earth Durability in A Humid Continental Climate" Buildings 10, no. 2: 26. https://doi.org/10.3390/buildings10020026