Examination and Evaluation of Durability of Polymer-Modified Mortar

Takahashi, Yuichi; Hamasaki, Hitoshi; Kanda, Tetsushi; Yasuda, Masayuki; Kojima, Masaro; Nonaka, Akira

doi:10.3130/aijt.19.813

Cited by 3 publications

(2 citation statements)

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“…Since polymer-based admixtures affect the physical and mechanical properties of cement mortars, as well as its durability, this investigation collects test data from previous investigations of various polymer materials, e.g., SRB, PAV, EVA, and VVA (Hamasaki et al 2010;Takahashi et al 2013). Since most polymer materials are commercial products that are mixed with cement to form repair materials, the detailed compositions of commercial products cannot be made public.…”

Section: Polymer-modified Cement Mortarsmentioning

confidence: 99%

Experimental Investigation on Mechanical Properties of SBR-Modified Mortar with Fly Ash for Patch Repair Material

Kao

Chiu

Ueda

et al. 2018

ACT

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This work determines the replacement ratio of fly ash of 25% in SBR-modified cement mortars based on the past research, including SBR emulsion (SBR-E) and SBR powder (SBR-P). In addition to the Japanese guidelines for the repair material, the past researches related to polymer-modified cement mortars are also used to determine an appropriate mix proportion of the patch repair material for deteriorated RC building structures. According to the experimental results in this work, it can be observed that increasing the S/W ratio of SBR is useful to improve the flexural bonding strength effectively; however, the compressive, flexural and tensile strength of cement mortars decreases. Besides of the mechanical strength, the workability and economy are considered to determine the S/W ratio of 10% of SBR-P for cement mortars with fly ash. Additionally, according to the regression results, its corresponding compressive, flexural, tensile and flexural bonding strengths are 36.5, 9.68, 3.35 and 2.8 MPa, respectively. For most of RC buildings with an age of over 30 years in Taiwan, since their average testing compressive strength is around 20 MPa, the suggested mix proportion of SBR-modified cement mortars with fly ash can provide enough performances for the patch repair.

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Section: Polymer-modified Cement Mortarsmentioning

confidence: 99%

Experimental Investigation on Mechanical Properties of SBR-Modified Mortar with Fly Ash for Patch Repair Material

Kao

Chiu

Ueda

et al. 2018

ACT

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“…In the existing literature, it has been reported that decreasing air permeability by reducing the water to cement ratio, or by applying a finishing material, was effective in preventing carbonation (Kasai 1983). Moreover, these studies found that incorporating and applying silane water repellent to a concrete mixture using recycled aggregate (Zhu et al 2013), using polymers as admixtures (Takahashi et al 2013), and using Silicone Oil (SO) (Saito et al 2004(Saito et al , 2005 were all effective for increasing the carbonation resistance.…”

Section: Introductionmentioning

confidence: 99%

Influence of Silicone Oil on Durability of Portland Blast Furnace Slag Cement Mortar

Kishimoto

Kim

Choi

et al. 2018

ACT

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In this study, the development of carbonation resistance in blast furnace slag (BFS) mortar when using silicone oil (SO) is investigated. Moreover, the influence of SO on drying shrinkage and frost resistance are investigated. The results indicate that SO tends to improve the carbonation resistance of BFS blended mortar and reduces drying shrinkage; however, it decreases frost resistance. The water repellency of SO has a positive effect on carbonation and drying shrinkage. Furthermore, there is a possibility that SO prevents the consumption of calcium hydroxide (CH) by carbonation and hydration in portland blast furnace slag cement type B (BB) samples. SO exists in the form of oil droplets in hardened cement pastes and inhibits the relaxation of water pressure at freezing. This is a probable cause for why SO decreases frost resistance.

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