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Variables Affecting the pH Measurement of Cement Mortars

Journal of Wuhan University of Technology(Materials Science) 2021年第5期36卷 689-696页

作者： PAYAM Shafigh SUMRA Yousuf zainah ibrahim Centre for Building Construction&Tropical Architecture(BuCTA)Faculty of Built EnvironmentUniversity of Malaya50603 Kuala LumpurMalaysia Department of Civil Engineering Faculty of EngineeringUniversity of Malaya50603 Kuala LumpurMalaysia Department of Building and Architectural Engineering Faculty of Engineering&TechnologyBahauddin Zakariya University60000 MultanPakistan

A quantitative pH measuring method has been used to measure the pH of pure and blended cement *** blended cement mortars incorporating supplementary cementitious materials(SCMs)such as fly ash(FA),ground granulated ballast furnace slag(GGBFS)and palm oil fuel ash(POFA)were ***,different variables affecting the pH values of CBMs such as temperature of sample solution,quantity of sample powder,dilution ratio and temporary storage of sample during pH measuring process have been studied for all cement mortars.

关键词： mortar cementitious materials pH value dilution ratio temperature

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The pH of Cement-based Materials:A Review

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Journal of Wuhan University of Technology(Materials Science) 2020年第5期35卷 908-924页

作者： Sumra Yousuf Payam Shafigh zainah ibrahim Department of Civil Engineering Faculty of EngineeringUniversity of Malaya50603 Kuala LumpurMalaysia Department of Building and Architectural Engineering Faculty of Engineering&TechnologyBahauddin Zakariya UniversityMultan 60000Pakistan Department of Building Surveying Faculty of Built EnvironmentUniversity of Malaya.50603 Kuala LumpurMalaysia Center for Building Construction&Tropical Architecture(BuCTA)Faculty of Built EnvironmentUniversity of Malaya50603 Kuala LumpurMalaysia

Cement-based materials (CBMs),such as paste,mortar and concrete,are highly alkaline with an initial high pH of approximately 12.0 to *** have a high pH due to the existing oxide mineral portlandite and alkali metal contents in Portland *** high pH of concrete provides excellent protection and reinforces the steel bars against *** pH of concrete does not remain constant due to ageing and other defect-causing factors,such as chloride ingress,alkali leaching,carbonation,corrosion,acid attack,moisture and biodegradation *** the concrete pH has negative impact on the strength,durability and service life of concrete ***,the high pH of concrete may also cause concrete structure deterioration,such as alkali silica reaction,porosity and moisture related damages in concrete *** pH of CBMs can be influenced by high *** instance,the extremely high volume (85%-100%) of slag-blended cement pastes shows considerable pH reduction from 12.80 to 11.34 at 800 ℃.As many concrete structure deterioration are related to concrete pH,using an accurate and reliable method to measure pH and analyse the durability of reinforced concrete structure based on pH values is extremely *** study is a comprehensive review of the pH of CBM in terms of measurement,limitations and varying values for different CBM types.

关键词： pH cementitious materials concrete portlandite durability corrosion alkali

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