美国混凝土协会期刊
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作者:Kenneth C. Hover
来源:[J].Materials Journal(IF 0.826), 2006, Vol.103 (5)ACI
摘要:Surface drying of freshly placed concrete is influenced by the evaporative conditions of the job-site microclimate. The influence of the combined effects of air and concrete temperature, relative humidity, and wind speed are often estimated by use of the equations graphically rep...
作者:Roberto C. A. Pinto , Kenneth C. Hover
来源:[J].Materials Journal(IF 0.826), 1999, Vol.96 (5)ACI
摘要:An investigation was performed to assess the influence of silica fume and superplasticizer on the heat of hydration of mortar mixes with low water-cementitious materials ratio. Superplasticizer and silica fume were added in various proportions to a control mix. The temperature ri...
作者:Roberto C. A. Pinto , Kenneth C. Hover
来源:[J].Materials Journal(IF 0.826), 1999, Vol.96 (6)ACI
摘要:The influence of temperature on setting times was studied using the maturity approach and the Freiesleben-Hansen and Pederson maturity function. This function requires a value for the apparent activation energy Ea of cement hydration. A method to estimate Ea at the early stages o...
作者:... Arthur H. Nilson , Kenneth C. Hover
来源:[J].Materials Journal(IF 0.826), 1991, Vol.88 (2)ACI
摘要:A large body of experimental evidence is now available to confirm that the creep coefficient of high-strength concrete under sustained axial compression is significantly less than that of ordinary concrete. Thus, the ratio of time-dependent deflection to immediate elastic deflect...
作者:Walid S. Najjar , Kenneth C. Hover
来源:[J].Materials Journal(IF 0.826), 1989, Vol.86 (4)ACI
摘要:The neutron radiography technique developed for studying microcracking in concrete is used to investigate the effect of various types of compressive loads on the internal cracking of concrete cylinders. These studies include measurement of the incidence of microcracking in concre...
作者:Christos A. Shaeles , Kenneth C. Hover
来源:[J].Materials Journal(IF 0.826), 1988, Vol.85 (6)ACI
摘要:Plastic shrinkage cracking in mortar panels, simulating cracking in concrete slabs, was investigated using the procedure developed by Kraai. For the specific conditions of the testing program, the incidence of plastic shrinkage cracking increased with the paste volume fraction. I...
作者:Raymond A. Cook , Kenneth C. Hover
来源:[J].Materials Journal(IF 0.826), 1993, Vol.90 (2)ACI
摘要:This paper briefly reviews the technique of mercury porosimetry, presents assumptions and corrections relevant to the application of mercury porosimetry to cement-based materials, and examines the impact of these corrections and assumptions on calculations based upon porosimetry ...
作者:Kenneth C. Hover , Kevin J. Folliard ...
来源:[J].Materials Journal, 2007, Vol.104 (1)ACI
摘要:As part of a larger investigation on segmental retaining wall (SRW) concrete durability, databases of ASTM C 1262 freezing and - thawing mass loss were compared with SRW material characteristics to assess the usefulness of these characteristics as indexes of frost durability. It ...
作者:... Kevin J. Folliard , Kenneth C. Hover
来源:[J].Materials Journal, 2008, Vol.105 (5)ACI
摘要:The amount of air-entraining admixture (AEA) needed to achieve a target air content in fresh concrete can vary significantly with differences in the fly ash used in the concrete. The work presented in this paper evaluates the ability to predict the AEA dosage on the basis of test...
作者:Chang Hoon Lee , Kenneth C. Hover
来源:[J].Materials Journal, 2016, Vol.113 (2)ACI
摘要:Maturity methods are used to predict strength or other mechanical properties of a concrete mixture for a given moisture availability as a function of time and temperature. Temperature sensitivity of a mixture is characterized by datum temperature for the Nurse-Saul (NS) method, a...

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