Shadowing Practice: MinuteCement - LC3 - Learn English Speaking with Video
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In 2012, 3 .6 billion tons of cement were produced worldwide.
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That amount is more than all the food produced for human consumption that same year.
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We mixed most of the cement with about 22 billion tons of aggregates and 2 .5 billion tons of water.
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This makes concrete the product most consumed by humans.
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We use it to build homes, bridges and other infrastructure we use every day.
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The reasons concrete is so popular is because it is cheap, made of widely available materials and easy to use.
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But the global demand for concrete requires huge amounts of resources.
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And we are going to need even more.
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By 2050, the cement consumption is expected to double.
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Look at how China alone is already consuming more cement than the whole world in 1990, and how India's cement production has doubled over the past 10 years.
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It will be a real challenge to meet the projected demand.
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Compared to many other materials, producing cement is very ecological.
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But with several brilliant tons produced each year, the cement industry is a major contributor to global CO2 emissions.
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Where does it come from exactly?
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To manufacture cement, limestone and clay are heated together in a large kiln at about 1450 degrees Celsius.
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This produces an intermediate material called clinker, which is rapidly cooled, mixed together with gypsum and ground to make cement.
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40 % of CO2 emissions come from burning the fuels needed for the kiln.
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The efficiency of this manufacturing process is already optimized in most modern cement plants.
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But we can act on the 60 remaining percent of CO2 emissions, which come straight from the decomposition of the limestone.
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How, you ask?
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We can substitute part of this clinker by less CO2 -intensive materials, called supplementary cementitious materials.
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We often throw in waste materials from other industries.
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For example, blast furnace slag from steel plants or fly ashes from coal -fired power plants.
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What you get is a blended cement.
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Sadly, there are not enough substitute materials for everyone.
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So what other substitutes can we use?
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When calcined at a temperature of only 800 degrees Celsius, clay becomes reactive and can be used as a replacement material.
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We can also add limestone without any heating.
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Simply grind it and voila!
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We know how to use them separately, but if we add both of them to clinker, there is a synergy between the components and you get a perfectly good cement even with high additions.
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This is where LC3 comes in.
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LC3 stands for Limestone Calcined Clay Cement.
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It is a special blend composed of 50 % clinker, 30 % calcined clay and 15 % ground limestone.
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With 50 % of replacement, we can double the production of cement with the same amount of clinker better yet we can use limestone
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and clay of lower grade normally discarded by industries no precious agricultural soil
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or topsoil will be used also clays are abundantly available in
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regions where the highest cement consumption is expected LC3 aims to
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provide local solutions to the global demand this new material is
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very attractive is it sure it is low carbon up to
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50 % of the clinker can be substituted the limestone doesn't need to be heated
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and the clay is activated at low temperature.
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It is low cost.
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Cheap, low -grade materials can be used.
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Limestone and clay are widely available from existing quarries and easily extracted, within the first 5 meters of the earth's crust.
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It is low capital.
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Increasing production with LC3 requires less investment than adding a new production line.
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Simply adapt an existing kiln or buy a cheap one for the clay.
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And the best part is, LC3 is easy to use.
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You can replace a normal cement bag by a LC3 bag.
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You get the same handling, same procedure.
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Before LC3 can be mass produced, it needs to be certified according to industry standards.
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This is why LC3 has become a large -scale project, with scientific partners in Switzerland,
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India and Cuba, many industrial partners around the globe and the support of the SDC.
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Given the great advantages of LC3, we have the full support from the industry to show it's easy handling, its easy casting, its strength and its durability.
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As a group, we are all working full speed to make cement more sustainable.
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And as always, thanks for watching!
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Vocabulario y notas de pronunciación para esta lección
Esta lección de conversación de nivel C1 se basa en el vídeo “MinuteCement - LC3”. Las palabras que más se repiten: cement, material, clay, limestone, clinker. Este vídeo tiene 56 frases y 706 palabras para practicar shadowing. La parte hablada dura 4:07. El hablante habla a un ritmo natural de unas 172 palabras por minuto, cercano a una conversación cotidiana. Solo el 77 % de las palabras está entre las 3.000 más comunes del inglés, por lo que el vocabulario es exigente.
Vocabulario clave de este vídeo
Las 15 palabras más avanzadas del vídeo, con su pronunciación y significado:
| Palabra | Pronunciación | Significado |
|---|---|---|
| cement sustantivo | /səˈmɛnt/ | cemento |
| limestone sustantivo | /ˈlaɪmˌstoʊn/ | caliza |
| calcine verbo | /ˈkælˌsaɪn/ | calcinar |
| kiln sustantivo | /kɪln/ | horno |
| emission sustantivo | /ɪˈmɪʃ.ən/ | emisión |
| consume verbo | /kənˈsum/ | consumir |
| blend verbo | /blɛnd/ | mezclar, licuar |
| abundantly adverbio | /əˈbʌn.dn̩t.li/ | abundantemente |
| certify verbo | /ˈsɜː.tɪ.faɪ/ | certificar |
| compose verbo | /kəmˈpəʊz/ | componer |
| decomposition sustantivo | /diːˌkɒmpəˈzɪʃən/ | descomposición |
| discard verbo | /dɪsˈkɑɹd/ | desechar, descartar |
| durability sustantivo | /dəɹəˈbɪləti/ | durabilidad |
| gypsum sustantivo | /ˈd͡ʒɪp.səm/ | yeso |
| optimize verbo | /ˈɑptɪmaɪz/ | optimizar |
Gramática en este vídeo
Las estructuras que más usa el hablante, con las palabras exactas del vídeo:
| Estructura | En el vídeo |
|---|---|
| Voz pasiva be + participio pasado — importa lo que ocurre, no quién lo hace | were produced · is expected · are heated |
| Present perfect have/has + participio pasado — una acción pasada que sigue importando ahora | has doubled · has become |
Pronunciación a tener en cuenta
- Los sonidos de “sh” y “zh”: emission /ɪˈmɪʃ.ən/, cementitious /ˌsɛmɛnˈtɪʃəs/, decomposition /diːˌkɒmpəˈzɪʃən/
- Palabras largas — cuida el acento: cementitious /ˌsɛmɛnˈtɪʃəs/, decomposition /diːˌkɒmpəˈzɪʃən/, durability /dəɹəˈbɪləti/, contributor /kənˈtɹɪb.jə.tɚ/, ecological /ˌiːkəˈlɒd͡ʒɪkl̩/
Sonidos difíciles para hispanohablantes:
- /v/ — no es /b/: los dientes tocan el labio inferior: reactive /ɹiːˈæktɪv/, activate /ˈæktɪˌveɪt/, intensive /ɪnˈtɛnsɪv/
- /z/ — sonora, no /s/: compose /kəmˈpəʊz/, decomposition /diːˌkɒmpəˈzɪʃən/, optimize /ˈɑptɪmaɪz/
- /dʒ/ — no es la “y” ni la “ch”: gypsum /ˈd͡ʒɪp.səm/, synergy /ˈsɪnəɹd͡ʒi/, ecological /ˌiːkəˈlɒd͡ʒɪkl̩/
Cómo practicar con este vídeo
- Escucha el vídeo entero una vez sin hablar y anota las palabras que no conoces.
- Empieza a velocidad 0,75×, haz shadowing frase por frase y vuelve a la velocidad normal cuando te resulte fácil.
- Grábate y compara con el original, prestando atención a palabras como cement, limestone, calcine.
¿Qué es la Técnica de Shadowing?
Shadowing es una técnica de aprendizaje de idiomas respaldada por la ciencia, desarrollada originalmente para la formación de intérpretes profesionales y popularizada por el políglota Dr. Alexander Arguelles. El método es simple pero poderoso: escuchas audio en inglés nativo y lo repites en voz alta de inmediato, como una sombra que sigue al hablante con solo 1-2 segundos de retraso. A diferencia de la escucha pasiva o los ejercicios de gramática, el shadowing obliga a tu cerebro y músculos de la boca a procesar y reproducir simultáneamente patrones de habla reales. Las investigaciones muestran que mejora significativamente la precisión de la pronunciación, la entonación, el ritmo, el habla conectada, la comprensión auditiva y la fluidez al hablar, convirtiéndola en una de las metodologías más efectivas para la preparación del IELTS Speaking y la comunicación en inglés en el mundo real.