TOP-CAST USER GUIDE for surface retarder application

may be referred to as "Micro-Exposed" • Mix designs should be heavy on sand contents (60/40) and should have a minimum cement factor of 564 pounds (335 kg/m³). Coarse aggregate should be 3/4" (19mm) in size if possible. The larger the aggregate, the easier it is to work the stone down from the surface.

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Micro-Deval Abrasion of Aggregates

MICRO-DEVAL ABRASION OF AGGREGATE TXDOT DESIGNATION: TEX-461-A CONSTRUCTION DIVISION 3 – 5 EFFECTIVE DATE: NOVEMBER 2016 4.3.3 Dry the material in an oven to constant weight, as defined in Section 2.1. 4.3.4 Proceed to Section 4.5. 4.4 Fine Aggregate: 4.4.1 Thoroughly wash a sufficient amount of material to prepare a test sample …

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Soil macroaggregate turnover and microaggregate formation…

At time 1 (t 1), macroaggregates (250–2000 μm) are formed around fresh residue which then becomes coarse intra-aggregate particulate organic matter (iPOM) (Fig. 1).The fresh residue induces the formation of macroaggregates because it is a C source for microbial activity and the production of microbial-derived binding agents (Golchin et al., 1994, Jastrow, 1996, Six …

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Micro-Deval Apparatus

An aggregate sample is placed in a sealed stainless steel jar with an abrasive charge of up to 5,000g of 9.5mm diameter stainless steel balls and water, then rotated at 100rpm for two hours. Aggregate quality is determined by percentage loss in gradation results at completion.

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eCFR :: 2 CFR 200.320 -- Procurement methods.

The aggregate dollar amount of the procurement transaction is higher than the micro-purchase threshold but does not exceed the simplified acquisition threshold. If simplified acquisition procedures are used, price or rate quotations must be obtained from an adequate number of qualified sources.

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(PDF) Architecture of soil microaggregates: …

Microaggregates (<250 μm) are recognized as the most stable soil structural units. They are built of mineral, organic, and biotic materials, provide habitats for a vast diversity of...

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(PDF) Microaggregates in soils

We propose a harmonized concept for aggregates in soils that explicitly considers the structure and build-up of microaggregates and the role …

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Characterization of interfacial transition zone of fly ash …

A micro measurement method combining optical microscopy (OM) and digital image correlation (DIC) is used to quantitatively study the impacts of fly ash content and aggregate types on the thickness and nominal compressive elastic modulus (E NC) of ITZ. The results show that this method can characterize the properties of ITZ very well.

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Part 13

This part prescribes policies and procedures for the acquisition of supplies and services, including construction, research and development, commercial products, and commercial services, the aggregate amount of which does not exceed the simplified acquisition threshold (see 2.101). subpart 13.5 provides special authority for acquisitions of commercial products and commercial …

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The Micro–Aggregated Profit Share

aggregate markup, aggregate returns to scale, an aggregate monopsony term—and a sufficient statistic for production networks that captures double marginalization. Our first theoretical result establishes that the aggregate profit share can be con-structed from micro-level data by weighting producers' profit rates—defined as profits

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eCFR :: 2 CFR Part 200 Subpart D

The aggregate dollar amount of the procurement transaction is higher than the micro-purchase threshold but does not exceed the simplified acquisition threshold. If simplified acquisition procedures are used, price or rate quotations must be obtained from an adequate number of qualified sources.

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Microbial regulation of aggregate stability and carbon …

For bacterial biomass, no-tillage significantly reduced them within micro-aggregate under N1, but significantly increased them within macro- and micro-aggregates under N2 and micro-aggregates under N3, compared with conventional tillage. Specifically, Fig. S4 depicts the PLFA profiles in each soil aggregate size class of different treatments.

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Soil aggregation: Influence on microbial biomass and …

He observed that micro-aggregate classes contained lower concentrations of C, N and P than macro-aggregates and that the C to N and P nutrient ratios were narrower. Elliott's paper also presented evidence showing that cultivation decreased the OM that binds together micro-aggregates into macro-aggregates providing protection and was the source ...

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Macroaggregate

Mycorrhizal fungi influence the formation or stabilisation of soil at the macro aggregate (53–250 μm) and micro aggregate (< 53 μm) scales with mechanisms that Rillig and Mummey (2006) differentiate into physical (such as altered water regimes and translocation), biochemical and biological processes.

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Architecture of soil microaggregates: Advanced …

Microaggregates (<250 µm) are recognized as the most stable soil structural units. They are built of mineral, organic, and biotic materials, provide habitats for a vast diversity of microorganisms, and are closely involved in the …

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Estimating the influence of related soil properties on macro- and micro

The macro-aggregate stability was determined by wet sieving, and the micro-aggregate distribution was determined via particle size distribution analysis; however, no chemical dispersant (sodium hydroxide) was applied. Using the PLSR models, the main soil properties that affect macro-aggregate and micro-aggregate stability were estimated.

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Linkage of aggregate formation, aggregate-associated C distribution

The large macro-aggregate significantly increased while silt-and-clay particles, micro-aggregates, and small macro-aggregates decreased from day 1 to 7 (Fig. 3), suggesting that large macroaggregates are composed of smaller-sized building units. At the same time, the formation of macroaggregates was accompanied by extensive incorporation of ...

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Micro- within macro: How micro-aggregation …

• Combination of X-ray µCT with laser diffractometry allows to quantify aggregate breakdown under slow saturation of water. • The linkages between micro- and macroaggregate architecture were quantitatively …

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Quantitative characterization of soil micro-aggregates: New

Micro-computed tomography (micro-CT), with a cross section pixel size in the micrometer 31 range, is an efficient tool to reveal the minute details of soil structure owing to its non-invasive 32 ...

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Soil aggregation and soil aggregate stability regulate organic carbon

Sample collected on top of >250 μm was designated as macro-aggregate, that remaining on 250-53 μm and the last one (<53 μm) as micro-aggregate. The material (water + soil) that passed through <53 μm was collected in buckets and centrifuged at 2500× g for 10 min to obtain <53 μm aggregate.

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Organic matter stabilization in soil …

Two-dimensional micro- and nano-scale observations of the C distribution in soil microaggregates have provided new insight into the mechanisms of microaggregate formation and thus stabilization of organic C.

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Quantitative characterization of soil micro-aggregates: New

A comprehensive characterization of the aggregate morphology is the first step towards a complete characterization of the soil microaggregates, when trying to correlate morphometric parameters with physical and/or biological properties, or when building models (e.g., effective diffusivity, microbial distribution, etc.).

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PRODUCT DATA SHEET Sikacrete®-114 AE

FREE FLOWING MICRO-CONCRETE FOR GROUTING AND REPAIR DESCRIPTION Sikacrete®-114 AE is a one component, free-flowing, high strength, non-shrink, cement based micro-con-crete with a maximum aggregate size of 10 millimeter. Suitable for use in hot and tropical climatic conditions. USES Sikacrete®-114 AE is used for the structural repair of

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Micro- within macro: How micro-aggregation …

Intra-aggregate pores play an important role in controlling soil processes on a micro-scale. Differences in parent materials, pedogenic processes, land use, and management practices can have a ...

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Micro aggregate and pozzolanic reactivity of fly ash: effect …

The performance of fly ash blended concrete is influenced by the pozzolanic and/or micro-aggregate effect of fly ash particles based on the replacement levels. Dominance of either of this effect greatly influences the mechanical and fracture properties of fly ash blended concrete. In view of this, in the present study, 0%, 20%, 30%, 35%, 40% ...

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AASHTO Accreditation Policy and Guidance on Micro …

Sutherland Micro-Deval Fine Aggregate" are within allowed tolerance given below in 11.1.1, the mean value and range obtained with the supply of the in-house calibration aggregate shall be used thereafter. At any time a new supply of the in-house calibration aggregate is required, the calibration procedure shall be conducted. ...

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Micro Surfacing

One of the most versatile tools in the pavement preservation toolbox, Micro Surfacing is a mixture of cationic polymer-modified emulsified asphalt, crushed aggregate, water, and other additives, properly proportioned and spread over a prepared surface. The special-purpose polymers and additives used in micro surfacing allow multiple stone ...

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EQUIPMENT CHECKED: MICRO DEVAL ABRASION …

CONSTRUCTION DIVISION, MATERIALS & PAVEMENTS SECTION (CST/M&P) AGGREGATE IN-HOUSE CALIBRATION PROCEDURE # 19A MICRO DEVAL ABRASION MACHINE AND APPARATUS (CST/M&P) CST/M&P 2 – 3 EFFECTIVE DATE: MAY 2014 3.2 Micro Deval Machine – Calibration Requirement 1. Read all of Section 11 in ASTM D 6928 before continuing.

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Thrombocytopenia following routine blood transfusion: micro-aggregate

11 patients with anaemia and thrombocytopenia due to bone marrow failure each received 2 sets of red-cell transfusions. They were randomised to receive 1 blood transfusion through a standard 170-micron giving set filter and another through a 40 micron micro-aggregate filter. After transfusion, the m …

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Evolution of early hydration in mortar by using waste …

Correspondingly, the dolomite powder used as a micro-aggregate at the same water-cement ratio could improve the properties of cement – based materials and reduce the economic cost [12], [13]. Compared to the active SCMs, dolomite powder (CaMg(CO 3 ) 2 ) is an inert mineral material composed of Ca 2+, Mg 2+ and CO 2- 3 ions.

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Efficiency of leukocyte depletion filters and micro-aggregate …

We compared the efficacy and safety of leukocyte depletion and micro-aggregate filters in combination with intra-operative cell salvage during cesarean delivery. Methods: Blood was collected in a Cell Saver 5 reservoir during cesarean delivery. Four samples were collected: pre-wash, post-wash, post-filtration with a leukocyte depletion filter ...

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Micro-Aggregate Stability in Greenhouse Management …

micro-aggregate architecture have major effects on many soil functions, such as water storage and trans-port, cycling of carbon, nitrogen and other plant nutrients [8, 11, 17]. In micro-aggregate, specific compounds having certain chemical functional groups may be responsible for binding organic carbon to min-eral surfaces [11, 22].

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Soil aggregates as massively concurrent evolutionary incubators

Soil aggregation is a continuous and dynamic process in which the formation and disintegration of individual micro- and macroaggregates are separated in time by periods of relative stability ...

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Soil aggregates as massively concurrent evolutionary …

We define microbial evolution in soil aggregates as any change in the relative allele frequencies or phylotype frequencies of the microbial populations enclosed within an …

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Macro-and micro-aggregate stability of soils determined …

The combination of the macro- and micro-aggregate stability tests is a consistent way for describing the structural stability of the studied soils.

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Soil water repellency and micro-aggregate fractions in

SWR, micro-aggregate fractions, and other physiochemical properties like soil organic carbon (SOC) and total nitrogen (TN) were determined. Results showed that SWR increased by 64.93% in T1 than in CK, and fertilization managements (i.e., T1, T2, T3, and T4) markedly increased soil 1000-250 μm fraction by 34.50-50.74% and reduced 250-50 μm ...

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