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Engineers in Gaza convert the rubble of war into concrete for rebuilding

Israel/Palestine
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An all-female team of engineers in Gaza have invented an affordable new way to produce concrete from the leftover rubble of homes destroyed during the last war in Gaza. And the four women behind the project–Nour Buhaisi, Aya Abu Hashish, Rahma Ashour, and Angham Elmadhoun–are challenging stereotypes along the way.

The women want to scale their operation for mass production and are looking to get a contract with a private company or a non-governmental organization. They aspire to create a needed alternative to the expensive and time-consuming process of importing construction materials into Gaza by relying mostly on recycled materials.

The first time the engineers made their formula they were still students pursuing their undergraduate degrees. After 11 months of scientific experiments, they finally made this first sample by gathering 44 pounds of glass and crushing it in a laboratory at the Islamic University of Gaza, in Gaza City. The glass was mechanically ground for 15 hours, yielding a very soft powder. Then, they combined it with cement, silica fume (a silicon-based material), crushed concrete blocks and fly ash made from spent coal. The mixture was then compacted under high pressure.

To their surprise, the engineers produced a durable concrete on the first try. 

After 24-hours of pressure, engineers open a sample of concrete. (Photo: Mohammed Asad)

Engineers water test concrete. (Photo: Mohammed Asad)

Engineers in Gaza test concrete’s compressive strength. (Photo: Mohammed Asad)

“We were determined to find a practical project, not to remain dead in the water in a back corner of our university’s library.” Buhaisi said, “we intended to make environment-friendly cement and we produced double the strength of regular cement, so we killed two birds with one stone.”

In Gaza, cement is a scarce resource. Buhaisi told Mondoweiss this is because of 11 years of the blockade. The cement deficit if further compounded the last war. And the wreckage has deprived some 40,000 workers of employment in the construction sector.

After the last assault on Gaza in 2014, the United Nations estimated 120,000 residential units were destroyed in full or in part. Of them, 71,000 are already rebuilt and construction is underway on an additional 12,000. Over 57,000 housing units still need to be rebuilt and not all of the rubble from these destroyed homes has been cleared.

“In any neighborhood, you might find dozens of hills still littered with free-standing crushed concrete blocks and wide areas scattered with broken glass. The fact that the glass is a not an eco-friendly component [to produce], made us feel that our project is an increasingly bright idea,” Buhaisi added.

The female team said they hope to speed the pace of reconstruction. Rebuilding could take a century, according to a Feb. 2015 Oxfam report that said, “At current rates, it could take more than 100 years to complete the essential building of homes.” 

In part, rebuilding is stalled due to Israeli restrictions on the import of cement. Israeli regulations limit so-called “dual use” substances from entering Gaza. These include building materials that are used for homes, but also have potential to build tunnels or an underground cache of weapons.

After the 2014 war in Gaza, imports of construction materials were further limited by the United Nations-brokered Gaza Reconstruction Mechanism (GRM), and agreement between the Palestinian and Israeli governments. The GRM caps and monitors imports of cement and reinforcement bars–also called ABC materials. When possible violations to the deal occur, Israel can freeze imports. 

Last April Israel suspended all private sector cement imports into Gaza’s for 45 days. At that time Israel had said Hamas was siphoning cement off for military purposes. Still, international organizations were allowed continue to their cement shipments, where Israel permitted around only 3,500 to 4,000 tons of cement to enter Gaza per day, which is a small amount when weighed against the urgent need.

After the last war, UNRWA found a total of 1.5 million tons of concrete was needed to rebuild Gaza.

Engineers test the strength of their cement sample. (Photo: Mohammed Asad)

Cement is poured into molds. (Photo: Mohammed Asad)

Engineers mix cement. (Photo: Mohammed Asad)

The female engineers saw the burden the GRM imposed on Gaza’s homeless and wanted to bypass the chain of obstacles most Palestinians face. “We aimed to help our people to rebuild their destroyed houses after three wars in a decade, which left thousands of buildings flattened,” Buhaisi said.

Buhaisi added her project will solve a related problem in Gaza: the lack of landfills, specifically what to do with tons of non-biodegradable glass. Her team has a use for glass waste as a base material for the new concrete. Larger scale production could improve the local visual landscape.

As for fly ash, another main material in the concrete recipe, the engineers collected it by asking the local restaurants if they could take cinders from their grills. This sparked many curious questions from barbecue owners.

“Restaurant owners were wondering if the cement will be a ‘barbecue blend,’ and joked that tiny steaks would appear inside of concrete walls,” Buhaisi said.

(Photo: Mohammed Asad)

Powdered glass is mixed into other materials to make cement. (Photo: Mohammed Asad)

A cement sample. (Photo: Mohammed Asad)

About Ahmad Kabariti

Ahmad Kabariti is a freelance journalist based in Gaza.

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12 Responses

  1. oldgeezer
    oldgeezer
    February 20, 2017, 9:17 pm

    Ah yes those Palestinians and Arabs what have they ever done for humanity that can compare to the cherry tomato!

    This is not only brilliant but I would hope that it does end up have a huge positive environmental side.

    Considering the conditions they have to study and work under this is truly amazing.

    • Maghlawatan
      Maghlawatan
      February 20, 2017, 10:24 pm

      Israel also invented hummus and tabbouleh

      • Talkback
        Talkback
        February 21, 2017, 8:21 am

        And drip irrigation.

    • Kay24
      Kay24
      February 21, 2017, 8:22 am

      It is indeed. Despite the all the hardship and suffering, the Palestinian people are resilient, and will endure much to succeed. They have been viciously put down, ill treated, and prevented from progressing as a people. This is a great accomplishment. Good luck to all.

    • bintbiba
      bintbiba
      February 21, 2017, 11:09 am

      @oldgeezer

      “Considering the conditions they have to study and work under this is truly amazing. ”

      You make us all SO PROUD , Nour , Aya , Rahma and Angham !!

  2. Maghlawatan
    Maghlawatan
    February 20, 2017, 10:29 pm

    engineer is a very distinguished title in the Arab world

    In Cairo a sign of respect is to say “ya bash mohandis” which means “O Engineer Pasha” to someone

    • RoHa
      RoHa
      February 21, 2017, 12:02 pm

      It’s a distinguished title in Scandinavian countries. And quite right, too. It’s engineers that make things work. Without them, we would still be struggling with sticks and mud.

  3. RoHa
    RoHa
    February 21, 2017, 12:11 pm

    I’d like them to cover their faces. Breathing concrete dust and powdered glass won’t do them any good.

  4. genesto
    genesto
    February 21, 2017, 12:30 pm

    As a civil/structural engineer for many years, as well as a part-time Palestinian justice activist, I LOVE this story! In fact, as a member of the 2010 Gaza Freedom Flotilla, I was scheduled to meet with an UNRWA engineer in Gaza to discuss how we could use local, natural materials, like sand and clay, to rebuild Gaza from the 2008 attack. Of course, that meeting never happened and I’ve yet to visit Gaza.

    These women, though, are definitely on the right track and are doing some great things, not only for Gaza but for building technology in general. I applaud their efforts and hope they can continue to grow this enterprise.

  5. xanadou
    xanadou
    February 22, 2017, 4:14 pm

    Calling Carlos Latuff: Rosie the Riveter is looking for a poster with her Palestinian sister…

    The poster would need a link to the team where interested parties might be able to find and speak about possible co-operation with the Engineers. If no one has yet responded with an offer, plaster the poster onto all the social media. The homeless of Palestine cannot wait a century for a roof over their heads, with some of those roofs sure to be crushed by the “heroic” israeli Luftwaffe.

    Not least of all, Syria, Iraq and so many other countries need the Palestinian Engineers’ solution to quickly rebuild their own cities. N’est-ce pas?

    • xanadou
      xanadou
      February 22, 2017, 7:23 pm

      I have just noticed how each one of the Engineers is bundled up. It must be bloody cold in that lab. Could the “chosen ubermenschen” be afraid of successful, meaningful, professional competition from a handful of Palestinian maiden-Engineers to need to expand on the well and long-established abuse of the Palestinian population? Mein Gott in Himmel, how much more petty and common can they get on the sliding downscale?

      • echinococcus
        echinococcus
        February 23, 2017, 3:40 am

        Nah, the Uebermenschen are not afraid, Xanadou. The usual procedure will apply as soon as the thing seems to have any success. Either the method will be invented by Goldstein and commercialized by Levy financed by Bloch, or then killed and erased.

        In any case, even if any future buildings in Gaza are erected using this method, they will be flattened into flesh-containing rubble at the next future genocide raid by the Inhuman Destruction Forces.

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