title: Mechanical and rheological properties of 3D printable cement composites

authors: Qasimi, Maathar Al

subjects: Microfibrillated cellulose

abstract: Additive manufacturing is a recent revolution in the construction field since cementitious materials became printable. This extrusion technique has enabled the construction of very complex geometry with a reduction in costs, time and labour interventions. This study aims to evaluate the possibility of reinforcing 3D printable cementitious composites with the use of nano and micro materials, particularly nano silica, micro silica and microfibrillated cellulose (MFC) which are known for their ability to enhance the fresh and hardened properties of cement-based composites. Rheology property test, flowability and mechanical properties are the types of tests performed to evaluate the fresh and hardened properties of mortar modified with the rested additives. The results show the addition of MFC of 0.4% (of total solid matter) can significantly enhance the mechanical property. In addition, the presence of MFC (at 0.4% of total solid matter) can reduce the pressure required to extrude the mortar, enabling a steady state extrusion. It was also found that 1% nano silica addition significantly improves the mechanical properties and minimizes segregation in the failure surface.

text: Mechanical and rheological properties of 3D printable cement composites Additive manufacturing is a recent revolution in the construction field since cementitious materials became printable. This extrusion technique has enabled the construction of very complex geometry with a reduction in costs, time and labour interventions. This study aims to evaluate the possibility of reinforcing 3D printable cementitious composites with the use of nano and micro materials, particularly nano silica, micro silica and microfibrillated cellulose (MFC) which are known for their ability to enhance the fresh and hardened properties of cement-based composites. Rheology property test, flowability and mechanical properties are the types of tests performed to evaluate the fresh and hardened properties of mortar modified with the rested additives. The results show the addition of MFC of 0.4% (of total solid matter) can significantly enhance the mechanical property. In addition, the presence of MFC (at 0.4% of total solid matter) can reduce the pressure required to extrude the mortar, enabling a steady state extrusion. It was also found that 1% nano silica addition significantly improves the mechanical properties and minimizes segregation in the failure surface.

year: 2020

title: Evaluation of an off-feet heat response test for elite rugby sevens athletes

authors: Fenemor, Stephen Paul

abstract: A heat response test (HRT) assesses adaptations to heat stress and athlete readiness to perform in hot conditions. However, testing is often not sport-specific, and is challenging to incorporate into elite team-sports schedules due to competing training priorities. Seven non-heat acclimated elite rugby sevens athletes (25 ± 3 years; 95.3 ± 6.5 kg; 190 ± 3 cm) undertook two rugby sevens specific running tests in ambient (20 °C, 50% rH; RUN:AMB), and hot (35 °C, 80% rH; RUN:HOT) conditions, along with a heart rate (HR) matched cycling-based HRT (CYCLE:HOT). Physiological and perceptual variables were monitored throughout each test. Mean tympanic temperature (TTymp), HR, thermal sensation, rate of perceived exertion, and sweat loss significantly increased, while thermal discomfort and performance decreased in RUN:HOT compared with RUN:AMB, (all d > 1.40; p < 0.05). Significant reductions in mean TTymp and HR were evident in CYCLE:HOT compared with RUN:HOT (both d > 1.10; p < 0.05), whereas there were no clear differences in any perceptual variables. Mean peak TTymp was 39.5 ± 0.5 °C in RUN:HOT and 38.8 ± 0.4 °C CYCLE:HOT, respectively. Acute heat stress is detrimental to performance in non-heat acclimated elite rugby sevens athletes. High-intensity cycling in the heat can replicate the perceptual (but not the physiological) stress associated with high-intensity running in the heat. Cycling-based HRT could be used to avoid additional mechanical load associated with running-based heat testing.

text: Evaluation of an off-feet heat response test for elite rugby sevens athletes A heat response test (HRT) assesses adaptations to heat stress and athlete readiness to perform in hot conditions. However, testing is often not sport-specific, and is challenging to incorporate into elite team-sports schedules due to competing training priorities. Seven non-heat acclimated elite rugby sevens athletes (25 ± 3 years; 95.3 ± 6.5 kg; 190 ± 3 cm) undertook two rugby sevens specific running tests in ambient (20 °C, 50% rH; RUN:AMB), and hot (35 °C, 80% rH; RUN:HOT) conditions, along with a heart rate (HR) matched cycling-based HRT (CYCLE:HOT). Physiological and perceptual variables were monitored throughout each test. Mean tympanic temperature (TTymp), HR, thermal sensation, rate of perceived exertion, and sweat loss significantly increased, while thermal discomfort and performance decreased in RUN:HOT compared with RUN:AMB, (all d > 1.40; p < 0.05). Significant reductions in mean TTymp and HR were evident in CYCLE:HOT compared with RUN:HOT (both d > 1.10; p < 0.05), whereas there were no clear differences in any perceptual variables. Mean peak TTymp was 39.5 ± 0.5 °C in RUN:HOT and 38.8 ± 0.4 °C CYCLE:HOT, respectively. Acute heat stress is detrimental to performance in non-heat acclimated elite rugby sevens athletes. High-intensity cycling in the heat can replicate the perceptual (but not the physiological) stress associated with high-intensity running in the heat. Cycling-based HRT could be used to avoid additional mechanical load associated with running-based heat testing.

year: 2022-01-01

title: Tariao Whitiwhitiora

authors: Totorewa, Te Oko Horoi

abstract: I te tau 1875 i tiihooka tahi atu a Kiingi Taawhiao ki Taranaki ka tau ki mua ki te aroaro o Te Uahaumeene. Matua raa ko te rongomau me te rangimaaria, te kotahitanga me te aroha o teetehi ki teetehi maa roto mai i te whakapono ki te atua te whaainga i haere ai ia.

Ka tutuki i a Kiingi Taawhiao te rongomau me te rangimaaria, te kotahitanga me te aroha o teetehi ki teetehi maa te whakakotahi i ngaa ngaa koorero, ngaa hiitori, ngaa whakapapa, ngaa maataapono mai o te taioretanga o ngoo taatou tuupuna ka toopuuria ki te whakapono Tariao.

He whakapono teenei i whakaorangia e ia, e Kiingi Taawhiao maa roto mai i te tongikura, “E Ua, e toru ngaa taonga kei te kapu o taku ringa, ko te Mihinare, ko te Katorika me te Weteriana. Homai taau ka whaa. Kopi katoa ngeenei taonga i au ki te kapu o taku ringa, ka puta ko te Paimaarire.” Ko te whakapono Tariao me ngaa karakia Paimaarie ka hikitia, ka haapaingia tonu e maatou ngaa mangainga, ngaa kaiwhakapuumau i te Kiingitanga inaa raa koia teenei te whakapono matua moo te Kiingitanga.

I teenei tuhinga whakapae ko te whakapono Tariao te taahuhu o ngaa koorero. I konei ngahere mai ai te kaupapa matua o teenei tuhinga.

“He kura Tariao he kura whakapapa, te herenga ki te whakaoranga o Waikato tangata”

Ko teenei kaupapa ka whakarukuhia maa te rangahau i te ahunga mai o te maatauranga kei aa teenei whakapono i whea. Ka rangahautia ko te whakapaparanga o Kiingi Taawhiao mai i te Kore, ki a Rangi raaua ko Papa heke iho mai ki a Hoturoa, aa, ka tau ki a ia ki a Kiingi Taawhiao inaa raa, ko ngeenei momo he mea e tauiratia ana ki roto ki ngaa karakia, ki ngaa Kura kei teenei whakapono.

Ka hereherea ko Te Uahaumeene ki koneki naa, ki ngaa koorero e kitea ai maa whea i puaawai mai ai te Tariao me ngaa karakia Paimaarire. Ko te Kiingitanga me ngaana pehonga kaupapa e taapae atu ana ki te oranga o teenei whakapono maa te whakamahi i teenei whakapono teeraa ka waahia. Taea noatia ki te puutakenga mai o te whakapono ake, ngoonaa koorero, ngoona tuuranga, ngoona karakia, ngoona kura, ngoona whakamaaramatanga, tau iho mai ki te reo
 
tupuna o roto. Ko ngaa aupiki me ngaa auheke, te whakaraakeiora hoki i waatea mai, i whaipaanga atu ki te whakapono Tariao ka whakamaaramahia. Ka whakamutua atu me te taatari i ngaa putanga ka puta e kite ake ai me he herenga too teenei whakapono ki te whakaoranga o Waikato tangata.

text: Tariao Whitiwhitiora I te tau 1875 i tiihooka tahi atu a Kiingi Taawhiao ki Taranaki ka tau ki mua ki te aroaro o Te Uahaumeene. Matua raa ko te rongomau me te rangimaaria, te kotahitanga me te aroha o teetehi ki teetehi maa roto mai i te whakapono ki te atua te whaainga i haere ai ia.

Ka tutuki i a Kiingi Taawhiao te rongomau me te rangimaaria, te kotahitanga me te aroha o teetehi ki teetehi maa te whakakotahi i ngaa ngaa koorero, ngaa hiitori, ngaa whakapapa, ngaa maataapono mai o te taioretanga o ngoo taatou tuupuna ka toopuuria ki te whakapono Tariao.

He whakapono teenei i whakaorangia e ia, e Kiingi Taawhiao maa roto mai i te tongikura, “E Ua, e toru ngaa taonga kei te kapu o taku ringa, ko te Mihinare, ko te Katorika me te Weteriana. Homai taau ka whaa. Kopi katoa ngeenei taonga i au ki te kapu o taku ringa, ka puta ko te Paimaarire.” Ko te whakapono Tariao me ngaa karakia Paimaarie ka hikitia, ka haapaingia tonu e maatou ngaa mangainga, ngaa kaiwhakapuumau i te Kiingitanga inaa raa koia teenei te whakapono matua moo te Kiingitanga.

I teenei tuhinga whakapae ko te whakapono Tariao te taahuhu o ngaa koorero. I konei ngahere mai ai te kaupapa matua o teenei tuhinga.

“He kura Tariao he kura whakapapa, te herenga ki te whakaoranga o Waikato tangata”

Ko teenei kaupapa ka whakarukuhia maa te rangahau i te ahunga mai o te maatauranga kei aa teenei whakapono i whea. Ka rangahautia ko te whakapaparanga o Kiingi Taawhiao mai i te Kore, ki a Rangi raaua ko Papa heke iho mai ki a Hoturoa, aa, ka tau ki a ia ki a Kiingi Taawhiao inaa raa, ko ngeenei momo he mea e tauiratia ana ki roto ki ngaa karakia, ki ngaa Kura kei teenei whakapono.

Ka hereherea ko Te Uahaumeene ki koneki naa, ki ngaa koorero e kitea ai maa whea i puaawai mai ai te Tariao me ngaa karakia Paimaarire. Ko te Kiingitanga me ngaana pehonga kaupapa e taapae atu ana ki te oranga o teenei whakapono maa te whakamahi i teenei whakapono teeraa ka waahia. Taea noatia ki te puutakenga mai o te whakapono ake, ngoonaa koorero, ngoona tuuranga, ngoona karakia, ngoona kura, ngoona whakamaaramatanga, tau iho mai ki te reo
 
tupuna o roto. Ko ngaa aupiki me ngaa auheke, te whakaraakeiora hoki i waatea mai, i whaipaanga atu ki te whakapono Tariao ka whakamaaramahia. Ka whakamutua atu me te taatari i ngaa putanga ka puta e kite ake ai me he herenga too teenei whakapono ki te whakaoranga o Waikato tangata.

year: 2022