By Diane Throop, Richard E. Klingner
STP 1432 offers nineteen peer-reviewed papers on ancient, present, and estimated masonry concerns, starting from reviews of the habit of ancient masonry, via uncomplicated examine into the habit and strength program of cutting edge masonry fabrics. topics disguise ancient buildings, fabric checking out, review recommendations, and new items and structures. This new book is a priceless technical source for these concerned n the creation, layout, or trying out of masonry items or assemblies, together with designers, brands, engineers, architects, or specialists.
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Additional info for Masonry: Opportunities for the 21st Century (ASTM Special Technical Publication, 1432)
Table 5 lists six high-pozzolan Type N masonry cement cubes that were tested at 28 days and then 70 days later. Samples were cured under C 270 conditions for 28 days. After the original test and until the retest occurred, the cubes were stored on a lab bench at room temperature and humidity. Each cube was made with the same formula and contained 65% pozzolan. Samples have been placed in descending order of the 28-day compressive strength. The retest compressive strength was close to the strength that we would have anticipated if the cubes had not been tested at twenty-eight days.
The crystalline shape of the hydrated lime is variable, particularly with respect to aging, as shown by Rodiquez-Navarro, et al. . Their study found from X-ray diffraction, nitrogen adsorption, and scanning electron microscopy that there was a size reduction and morphological or shape change between fresh and 14-month-old aged lime putties. The traditional use of aged or slaked lime to improve workability and water-tightness is based on experience, as evident by an ancient Roman law requiring lime to be slaked and stored under water three years before its use .
Two test specimens of each mortar mix were molded and moist cured for 7 days prior to testing. Results of the tests are reported in Table 3. TABLE 3 --Mortar Compressive Strengths Slurry Type 1h 4h Putty 7 day Compressive Strength (psi) 620 808 774 Microstructural Characterization Of particular interest to the workability of lime-sand slurry mortars is the influence of aging of the lime-sand slurry. As this material is composed of saturated lime water, lime hydration products and sand, optical microscopy can show little beyond the surface, while scanning electron microscopy requires the removal or freezing of the water.
Masonry: Opportunities for the 21st Century (ASTM Special Technical Publication, 1432) by Diane Throop, Richard E. Klingner